feat(sql): Support SQL sources

README.md

@@ -259,7 +259,7 @@ Many thanks to Jetbrains for kindly providing a license for us to work on this a
 Many thanks to [ArtformGames](https://github.com/ArtformGames) for their 
 strong support and active contribution to this project!
 
-<img src="https://raw.githubusercontent.com/ArtformGames/.github/refs/heads/master/logo/logo_full.png" alt="ArtfromGames" width="500">
+<img src="https://raw.githubusercontent.com/ArtformGames/.github/master/logo/logo_full.svg" width="317px" height="117px" alt="ArtformGames">
 
 ## Open Source License
 

README_CN.md

@@ -280,7 +280,7 @@ EasyConfiguration for MineCraft!
 
 万分感谢来自 [ArtformGames](https://github.com/ArtformGames) 对本项目的大力支持与积极贡献！
 
-<img src="https://raw.githubusercontent.com/ArtformGames/.github/refs/heads/master/logo/logo_full.png" alt="ArtfromGames" width="500">
+<img src="https://raw.githubusercontent.com/ArtformGames/.github/master/logo/logo_full.svg" width="317px" height="117px" alt="ArtformGames">
 
 ## 开源协议
 

core/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.6</version>
+        <version>4.0.8</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <properties>

core/src/main/java/cc/carm/lib/configuration/adapter/ValueType.java

@@ -4,6 +4,7 @@ import org.jetbrains.annotations.NotNull;
 
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
+import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 
@@ -157,7 +158,7 @@ public abstract class ValueType<T> {
             ParameterizedType pt = (ParameterizedType) type;
             Type raw = pt.getRawType();
             StringBuilder sb = new StringBuilder();
-            sb.append(raw.getTypeName());
+            sb.append(raw.getClass().getName());
             sb.append('<');
             Type[] args = pt.getActualTypeArguments();
             for (int i = 0; i < args.length; i++) {
@@ -166,6 +167,7 @@ public abstract class ValueType<T> {
                 }
                 sb.append(args[i].getTypeName());
             }
+            sb.append('>');
             return sb.toString();
         }
         return type.getTypeName();

core/src/main/java/cc/carm/lib/configuration/source/ConfigurationHolder.java

@@ -6,9 +6,11 @@ import cc.carm.lib.configuration.adapter.ValueType;
 import cc.carm.lib.configuration.source.loader.ConfigurationInitializer;
 import cc.carm.lib.configuration.source.meta.ConfigurationMetaHolder;
 import cc.carm.lib.configuration.source.meta.ConfigurationMetadata;
+import cc.carm.lib.configuration.source.meta.StandardMeta;
 import cc.carm.lib.configuration.source.option.ConfigurationOption;
 import cc.carm.lib.configuration.source.option.ConfigurationOptionHolder;
 import cc.carm.lib.configuration.source.section.ConfigureSource;
+import cc.carm.lib.configuration.value.ConfigValue;
 import cc.carm.lib.configuration.value.ValueManifest;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
@@ -18,6 +20,8 @@ import org.jetbrains.annotations.UnmodifiableView;
 import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
+import java.util.Objects;
+import java.util.function.Predicate;
 
 public abstract class ConfigurationHolder<SOURCE extends ConfigureSource<?, ?, SOURCE>> {
 
@@ -51,7 +55,7 @@ public abstract class ConfigurationHolder<SOURCE extends ConfigureSource<?, ?, S
         return options;
     }
 
-    public <O> O option(@NotNull ConfigurationOption<O> option) {
+    public <O> @NotNull O option(@NotNull ConfigurationOption<O> option) {
         return options().get(option);
     }
 
@@ -66,14 +70,26 @@ public abstract class ConfigurationHolder<SOURCE extends ConfigureSource<?, ?, S
     @NotNull
     @UnmodifiableView
     public <M> Map<String, M> extractMetadata(@NotNull ConfigurationMetadata<M> type) {
+        return extractMetadata(type, Objects::nonNull);
+    }
+
+    @NotNull
+    @UnmodifiableView
+    public <M> Map<String, M> extractMetadata(@NotNull ConfigurationMetadata<M> type, @NotNull Predicate<M> filter) {
         Map<String, M> metas = new LinkedHashMap<>();
         for (Map.Entry<String, ConfigurationMetaHolder> entry : this.metadata.entrySet()) {
             M data = entry.getValue().get(type);
-            if (data != null) metas.put(entry.getKey(), data);
+            if (filter.test(data)) metas.put(entry.getKey(), data);
         }
         return Collections.unmodifiableMap(metas);
     }
 
+    @NotNull
+    @UnmodifiableView
+    public Map<String, ConfigValue<?>> registeredValues() {
+        return extractMetadata(StandardMeta.VALUE);
+    }
+
     public ValueAdapterRegistry adapters() {
         return this.adapters;
     }

core/src/main/java/cc/carm/lib/configuration/source/loader/ConfigInitializeHandler.java

@@ -5,26 +5,27 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 @FunctionalInterface
-public interface ConfigInitializeHandler<T> {
+public interface ConfigInitializeHandler<T, V> {
 
-    static <T> ConfigInitializeHandler<T> start() {
+    static <T, V> ConfigInitializeHandler<T, V> start() {
-        return (provider, path, value) -> {
+        return (provider, path, value, instace) -> {
         };
     }
 
-    void whenInitialize(@NotNull ConfigurationHolder<?> holder, @Nullable String path, @NotNull T value) throws Exception;
+    void whenInitialize(@NotNull ConfigurationHolder<?> holder, @Nullable String path,
+                        @NotNull T value, @Nullable V instance) throws Exception;
 
-    default ConfigInitializeHandler<T> andThen(ConfigInitializeHandler<T> after) {
+    default ConfigInitializeHandler<T, V> andThen(ConfigInitializeHandler<T, V> after) {
-        return (provider, path, value) -> {
+        return (provider, path, value, instance) -> {
-            whenInitialize(provider, path, value);
+            whenInitialize(provider, path, value, instance);
-            after.whenInitialize(provider, path, value);
+            after.whenInitialize(provider, path, value, instance);
         };
     }
 
-    default ConfigInitializeHandler<T> compose(ConfigInitializeHandler<T> before) {
+    default ConfigInitializeHandler<T, V> compose(ConfigInitializeHandler<T, V> before) {
-        return (provider, path, value) -> {
+        return (provider, path, value, instance) -> {
-            before.whenInitialize(provider, path, value);
+            before.whenInitialize(provider, path, value, instance);
-            whenInitialize(provider, path, value);
+            whenInitialize(provider, path, value, instance);
         };
     }
 

core/src/main/java/cc/carm/lib/configuration/source/loader/ConfigurationInitializer.java

@@ -21,18 +21,18 @@ import java.util.function.Function;
 public class ConfigurationInitializer {
 
     protected @NotNull PathGenerator pathGenerator;
-    protected @NotNull ConfigInitializeHandler<Field> fieldInitializer;
+    protected @NotNull ConfigInitializeHandler<Field, ConfigValue<?>> valueInitializer;
-    protected @NotNull ConfigInitializeHandler<Class<? extends Configuration>> classInitializer;
+    protected @NotNull ConfigInitializeHandler<Class<? extends Configuration>, Object> classInitializer;
 
     public ConfigurationInitializer() {
         this(PathGenerator.of(), ConfigInitializeHandler.start(), ConfigInitializeHandler.start());
     }
 
     public ConfigurationInitializer(@NotNull PathGenerator pathGenerator,
-                                    @NotNull ConfigInitializeHandler<Field> fieldInitializer,
+                                    @NotNull ConfigInitializeHandler<Field, ConfigValue<?>> valueInitializer,
-                                    @NotNull ConfigInitializeHandler<Class<? extends Configuration>> classInitializer) {
+                                    @NotNull ConfigInitializeHandler<Class<? extends Configuration>, Object> classInitializer) {
         this.pathGenerator = pathGenerator;
-        this.fieldInitializer = fieldInitializer;
+        this.valueInitializer = valueInitializer;
         this.classInitializer = classInitializer;
     }
 
@@ -44,34 +44,34 @@ public class ConfigurationInitializer {
         return pathGenerator;
     }
 
-    public ConfigInitializeHandler<Field> fieldInitializer() {
+    public ConfigInitializeHandler<Field, ConfigValue<?>> fieldInitializer() {
-        return fieldInitializer;
+        return valueInitializer;
     }
 
-    public void fieldInitializer(@NotNull ConfigInitializeHandler<Field> fieldInitializer) {
+    public void fieldInitializer(@NotNull ConfigInitializeHandler<Field, ConfigValue<?>> fieldInitializer) {
-        this.fieldInitializer = fieldInitializer;
+        this.valueInitializer = fieldInitializer;
     }
 
-    public ConfigInitializeHandler<Class<? extends Configuration>> classInitializer() {
+    public ConfigInitializeHandler<Class<? extends Configuration>, Object> classInitializer() {
         return classInitializer;
     }
 
-    public void classInitializer(@NotNull ConfigInitializeHandler<Class<? extends Configuration>> classInitializer) {
+    public void classInitializer(@NotNull ConfigInitializeHandler<Class<? extends Configuration>, Object> classInitializer) {
         this.classInitializer = classInitializer;
     }
 
-    public void appendFieldInitializer(@NotNull ConfigInitializeHandler<Field> fieldInitializer) {
+    public void appendFieldInitializer(@NotNull ConfigInitializeHandler<Field, ConfigValue<?>> fieldInitializer) {
-        this.fieldInitializer = this.fieldInitializer.andThen(fieldInitializer);
+        this.valueInitializer = this.valueInitializer.andThen(fieldInitializer);
     }
 
-    public void appendClassInitializer(@NotNull ConfigInitializeHandler<Class<? extends Configuration>> classInitializer) {
+    public void appendClassInitializer(@NotNull ConfigInitializeHandler<Class<? extends Configuration>, Object> classInitializer) {
         this.classInitializer = this.classInitializer.andThen(classInitializer);
     }
 
     public <T, A extends Annotation> void registerClassAnnotation(@NotNull Class<A> annotation,
                                                                   @NotNull ConfigurationMetadata<T> metadata,
                                                                   @NotNull Function<A, T> extractor) {
-        appendClassInitializer((holder, path, clazz) -> {
+        appendClassInitializer((holder, path, clazz, instance) -> {
             A data = clazz.getAnnotation(annotation);
             if (data == null) return;
             holder.metadata(path).setIfAbsent(metadata, extractor.apply(data));
@@ -81,7 +81,7 @@ public class ConfigurationInitializer {
     public <T, A extends Annotation> void registerFieldAnnotation(@NotNull Class<A> annotation,
                                                                   @NotNull ConfigurationMetadata<T> metadata,
                                                                   @NotNull Function<A, T> extractor) {
-        appendFieldInitializer((holder, path, field) -> {
+        appendFieldInitializer((holder, path, field, instance) -> {
             A data = field.getAnnotation(annotation);
             if (data == null) return;
             holder.metadata(path).setIfAbsent(metadata, extractor.apply(data));
@@ -123,7 +123,7 @@ public class ConfigurationInitializer {
                                       @Nullable String parentPath, @Nullable Field configField) {
         String path = getClassPath(holder, parentPath, root.getClass(), configField);
         try {
-            this.classInitializer.whenInitialize(holder, path, root.getClass());
+            this.classInitializer.whenInitialize(holder, path, root.getClass(), root);
         } catch (Exception e) {
             e.printStackTrace();
         }
@@ -140,7 +140,7 @@ public class ConfigurationInitializer {
         String path = getClassPath(holder, parentPath, clazz, configField);
 
         try {
-            this.classInitializer.whenInitialize(holder, path, (Class<? extends Configuration>) clazz);
+            this.classInitializer.whenInitialize(holder, path, (Class<? extends Configuration>) clazz, configField);
         } catch (Exception e) {
             e.printStackTrace();
         }
@@ -169,15 +169,15 @@ public class ConfigurationInitializer {
                 String path = getFieldPath(holder, parent, field);
                 if (path == null) return;
                 value.initialize(holder, path);
-                holder.metadata(path).set(StandardMeta.UNIT, true); // Mark the minimal config value unit.
+                holder.metadata(path).set(StandardMeta.VALUE, value); // Mark the minimal config value unit.
-                try {
-                    this.fieldInitializer.whenInitialize(holder, path, field);
-                } catch (Exception e) {
-                    e.printStackTrace();
-                }
                 if (holder.option(StandardOptions.SET_DEFAULTS)) {
                     value.setDefault(); // Set default value.
                 }
+                try {
+                    this.valueInitializer.whenInitialize(holder, path, field, value);
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
                 if (holder.option(StandardOptions.PRELOAD)) {
                     value.get(); // Preload the value by calling #get method.
                 }

core/src/main/java/cc/carm/lib/configuration/source/meta/StandardMeta.java

@@ -1,10 +1,12 @@
 package cc.carm.lib.configuration.source.meta;
 
+import cc.carm.lib.configuration.value.ConfigValue;
+
 public interface StandardMeta {
 
     /**
-     * To mark the {@link cc.carm.lib.configuration.value.ConfigValue} as a minimal unit path.
+     * To mark the {@link ConfigValue} instance of specific path.
      */
-    ConfigurationMetadata<Boolean> UNIT = ConfigurationMetadata.of(false);
+    ConfigurationMetadata<ConfigValue<?>> VALUE = ConfigurationMetadata.of();
 
 }

core/src/main/java/cc/carm/lib/configuration/source/option/StandardOptions.java

@@ -23,12 +23,13 @@ public interface StandardOptions {
     ConfigurationOption<Boolean> LOAD_SUB_CLASSES = of(true);
 
     /**
-     * Whether to pre parse the config values.
+     * Whether to pre parse the config values,
-     * <br> if false, the values will be parsed when calling
+     * may good to set true if you want to keep the config format.
-     * {@link cc.carm.lib.configuration.value.ConfigValue#get()}
      * <br> if true, the values will be parsed when
      * {@link ConfigurationHolder#initialize(Configuration)}.
+     * <br> if false, the values will be parsed when calling
+     * {@link cc.carm.lib.configuration.value.ConfigValue#get()}
      */
-    ConfigurationOption<Boolean> PRELOAD = of(false);
+    ConfigurationOption<Boolean> PRELOAD = of(true);
 
 }

core/src/main/java/cc/carm/lib/configuration/source/section/ConfigureSection.java

@@ -8,6 +8,7 @@ import org.jetbrains.annotations.UnmodifiableView;
 
 import java.util.*;
 import java.util.function.BiConsumer;
+import java.util.function.Consumer;
 import java.util.function.Function;
 import java.util.function.Supplier;
 import java.util.stream.Stream;
@@ -30,6 +31,24 @@ public interface ConfigureSection {
     @Contract(pure = true)
     @Nullable ConfigureSection parent();
 
+    /**
+     * Get the current section's path from {@link #parent()} of this section.
+     *
+     * @return The current path of this section, if {@link #isRoot()}, return empty string.
+     */
+    @NotNull String path();
+
+    /**
+     * Get the full path of this section.
+     *
+     * @return The full path of this section, if {@link #isRoot()}, return empty string.
+     */
+    default @NotNull String fullPath() {
+        if (parent() == null) return "";
+        return (parent().isRoot() ? "" : parent().fullPath() + pathSeparator()) + path();
+    }
+
+
     /**
      * Get the path separator for the section.
      *
@@ -44,6 +63,7 @@ public interface ConfigureSection {
      *
      * @return True if this section is a root section, false otherwise.
      */
+    @Contract(pure = true)
     default boolean isRoot() {
         return parent() == null;
     }
@@ -57,6 +77,15 @@ public interface ConfigureSection {
         return getValues(false).isEmpty();
     }
 
+    /**
+     * Gets the number of keys in this section.
+     *
+     * @return Number of keys in this section.
+     */
+    default int size(boolean deep) {
+        return getKeys(deep).size();
+    }
+
     /**
      * Gets a set containing all keys in this section.
      * <p>
@@ -238,11 +267,39 @@ public interface ConfigureSection {
     /**
      * Creates a new {@link ConfigureSection} with specified values.
      * <p> The {@link #parent()} of the new section will be this section.
+     * <p> This section will not be saved until {@link #set(String, Object)} is called.
+     * <p> If you want to create and use a section and set it to this section, use {@link #computeSection(String)}.
      *
      * @param data The data to be used to create section.
      * @return Newly created section
      */
-    @NotNull ConfigureSection createSection(@NotNull Map<?, ?> data);
+    @NotNull ConfigureSection createSection(@NotNull String path, @NotNull Map<?, ?> data);
+
+    /**
+     * Creates a new {@link ConfigureSection} with specified values.
+     * <p> The {@link #parent()} of the new section will be this section.
+     *
+     * @param data The data to be used to create section.
+     * @return Newly created section
+     */
+    default @NotNull ConfigureSection createSection(@NotNull String path, @NotNull Consumer<Map<String, Object>> data) {
+        return createSection(path, () -> {
+            Map<String, Object> map = new LinkedHashMap<>();
+            data.accept(map);
+            return map;
+        });
+    }
+
+    /**
+     * Creates a new {@link ConfigureSection} with specified values.
+     * <p> The {@link #parent()} of the new section will be this section.
+     *
+     * @param data The data to be used to create section.
+     * @return Newly created section
+     */
+    default @NotNull ConfigureSection createSection(@NotNull String path, @NotNull Supplier<Map<String, Object>> data) {
+        return createSection(path, data.get());
+    }
 
     /**
      * Creates a new empty {@link ConfigureSection}.
@@ -250,8 +307,8 @@ public interface ConfigureSection {
      *
      * @return Newly created section
      */
-    default @NotNull ConfigureSection createSection() {
+    default @NotNull ConfigureSection createSection(@NotNull String path) {
-        return createSection(new LinkedHashMap<>());
+        return createSection(path, new LinkedHashMap<>());
     }
 
     /**
@@ -262,17 +319,64 @@ public interface ConfigureSection {
      *
      * @param path The path to get the section from.
      * @return The section at the path, or a new section if it does not exist.
-     * @see #createSection()
+     * @see #createSection(String, Map)
      */
     default @NotNull ConfigureSection computeSection(@NotNull String path) {
+        return computeSection(path, new LinkedHashMap<>());
+    }
+
+    /**
+     * Get or create a section at the given path.
+     * <p>
+     * Any value previously set at this path will be replaced if it is not a section
+     * or will be returned if it is an exists {@link ConfigureSection}.
+     *
+     * @param path The path to get the section from.
+     * @return The section at the path, or a new section if it does not exist.
+     * @see #createSection(String, Map)
+     */
+    default @NotNull ConfigureSection computeSection(@NotNull String path, @NotNull Map<?, ?> data) {
         ConfigureSection current = getSection(path);
         if (current == null) {
-            current = createSection();
+            current = createSection(path, data);
             set(path, current);
         }
         return current;
     }
 
+    /**
+     * Get or create a section at the given path.
+     * <p>
+     * Any value previously set at this path will be replaced if it is not a section
+     * or will be returned if it is an exists {@link ConfigureSection}.
+     *
+     * @param path The path to get the section from.
+     * @return The section at the path, or a new section if it does not exist.
+     * @see #createSection(String, Map)
+     */
+    default @NotNull ConfigureSection computeSection(@NotNull String path, @NotNull Consumer<Map<String, Object>> data) {
+        return computeSection(path, () -> {
+            Map<String, Object> map = new LinkedHashMap<>();
+            data.accept(map);
+            return map;
+        });
+    }
+
+    /**
+     * Get or create a section at the given path.
+     * <p>
+     * Any value previously set at this path will be replaced if it is not a section
+     * or will be returned if it is an exists {@link ConfigureSection}.
+     *
+     * @param path The path to get the section from.
+     * @return The section at the path, or a new section if it does not exist.
+     * @see #createSection(String, Map)
+     */
+    default @NotNull ConfigureSection computeSection(@NotNull String path, @NotNull Supplier<Map<String, Object>> data) {
+        return computeSection(path, data.get());
+    }
+
+
     /**
      * Get the origin value of the path.
      *

core/src/main/java/cc/carm/lib/configuration/source/section/ConfigureSource.java

@@ -92,6 +92,11 @@ public abstract class ConfigureSource<
         return null;
     }
 
+    @Override
+    public @NotNull String path() {
+        return "";
+    }
+
     @Override
     public @NotNull Map<String, Object> getValues(boolean deep) {
         return section().getValues(deep);
@@ -103,8 +108,8 @@ public abstract class ConfigureSource<
     }
 
     @Override
-    public @NotNull ConfigureSection createSection(@NotNull Map<?, ?> data) {
+    public @NotNull ConfigureSection createSection(@NotNull String path, @NotNull Map<?, ?> data) {
-        return section().createSection(data);
+        return section().createSection(path, data);
     }
 
     @Override

core/src/main/java/cc/carm/lib/configuration/value/ValueManifest.java

@@ -4,6 +4,7 @@ import cc.carm.lib.configuration.adapter.ValueType;
 import cc.carm.lib.configuration.source.ConfigurationHolder;
 import cc.carm.lib.configuration.source.meta.ConfigurationMetaHolder;
 import cc.carm.lib.configuration.source.section.ConfigureSource;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -20,7 +21,6 @@ public class ValueManifest<T> {
 
     protected @NotNull Supplier<@Nullable T> defaultSupplier;
 
-
     public ValueManifest(@NotNull ValueType<T> type) {
         this(type, () -> null, EMPTY_INITIALIZER, null, null);
     }
@@ -93,12 +93,12 @@ public class ValueManifest<T> {
 
     public @NotNull String path() {
         if (path != null) return path;
-        else throw new IllegalStateException("No section path provided.");
+        else throw new IllegalStateException("No section path provided for Value(" + type() + ").");
     }
 
     public @NotNull ConfigurationHolder<?> holder() {
         if (this.holder != null) return this.holder;
-        throw new IllegalStateException("Value does not have a provider.");
+        throw new IllegalStateException("Value(" + type() + ") does not have a provider.");
     }
 
     public @NotNull ConfigureSource<?, ?, ?> config() {
@@ -109,16 +109,17 @@ public class ValueManifest<T> {
         return holder().metadata(path());
     }
 
+    @ApiStatus.Internal
     protected Object getData() {
         return config().get(path());
     }
 
+    @ApiStatus.Internal
     protected void setData(@Nullable Object value) {
         config().set(path(), value);
     }
 
-
+    private static final @NotNull BiConsumer<@NotNull ConfigurationHolder<?>, @NotNull String> EMPTY_INITIALIZER = (provider, valuePath) -> {
-    private static final @NotNull BiConsumer<@NotNull ConfigurationHolder<?>, @NotNull String> EMPTY_INITIALIZER = (provider, path) -> {
     };
 
 }

demo/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.6</version>
+        <version>4.0.8</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <properties>
@@ -33,6 +33,19 @@
             <scope>compile</scope>
         </dependency>
 
+        <dependency>
+            <groupId>${project.parent.groupId}</groupId>
+            <artifactId>easyconfiguration-feature-versioned</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>cc.carm.lib</groupId>
+            <artifactId>easyconfiguration-feature-versioned</artifactId>
+            <version>4.0.8</version>
+            <scope>compile</scope>
+        </dependency>
+
     </dependencies>
 
     <build>

demo/src/main/java/cc/carm/lib/configuration/demo/DatabaseConfiguration.java

@@ -7,7 +7,7 @@ import cc.carm.lib.configuration.value.ConfigValue;
 import cc.carm.lib.configuration.value.standard.ConfiguredValue;
 
 @HeaderComments({"", "数据库配置", "  用于提供数据库连接，进行数据库操作。"})
-public class DatabaseConfiguration implements Configuration {
+public interface DatabaseConfiguration extends Configuration {
 
     @ConfigPath("driver")
     @HeaderComments({
@@ -16,18 +16,19 @@ public class DatabaseConfiguration implements Configuration {
             "- MySQL(新): com.mysql.cj.jdbc.Driver",
             "- MariaDB(推荐): org.mariadb.jdbc.Driver",
     })
-    protected static final ConfigValue<String> DRIVER_NAME = ConfiguredValue.of(
+    ConfigValue<String> DRIVER_NAME = ConfiguredValue.of(
             String.class, "com.mysql.cj.jdbc.Driver"
     );
 
-    protected static final ConfigValue<String> HOST = ConfiguredValue.of(String.class, "127.0.0.1");
+    ConfigValue<String> HOST = ConfiguredValue.of(String.class, "127.0.0.1");
-    protected static final ConfigValue<Integer> PORT = ConfiguredValue.of(Integer.class, 3306);
+    ConfigValue<Integer> PORT = ConfiguredValue.of(Integer.class, 3306);
-    protected static final ConfigValue<String> DATABASE = ConfiguredValue.of(String.class, "minecraft");
+    ConfigValue<String> DATABASE = ConfiguredValue.of(String.class, "minecraft");
-    protected static final ConfigValue<String> USERNAME = ConfiguredValue.of(String.class, "root");
+    ConfigValue<String> USERNAME = ConfiguredValue.of(String.class, "root");
-    protected static final ConfigValue<String> PASSWORD = ConfiguredValue.of(String.class, "password");
+    ConfigValue<String> PASSWORD = ConfiguredValue.of(String.class, "password");
-    protected static final ConfigValue<String> EXTRA = ConfiguredValue.of(String.class, "?useSSL=false");
 
-    protected static String buildJDBC() {
+    ConfigValue<String> EXTRA = ConfiguredValue.of(String.class, "?useSSL=false");
+
+    static String buildJDBC() {
         return String.format("jdbc:mysql://%s:%s/%s%s", HOST.get(), PORT.get(), DATABASE.get(), EXTRA.get());
     }
 

demo/src/main/java/cc/carm/lib/configuration/demo/tests/ConfigurationTest.java

@@ -69,14 +69,14 @@ public class ConfigurationTest {
         provider.initialize(TEST);
 
         System.out.println("> Test Inner value before:");
-        System.out.println(TEST.INSTANCE.INNER_VALUE.resolve());
+        System.out.println(TEST.INSTANCE.STATUS.resolve());
 
         double after = Math.random() * 200D;
         System.out.println("> Test Inner value -> " + after);
-        TEST.INSTANCE.INNER_VALUE.set(after);
+        TEST.INSTANCE.STATUS.set(after);
 
         System.out.println("> Test Inner value after:");
-        System.out.println(TEST.INSTANCE.INNER_VALUE.resolve());
+        System.out.println(TEST.INSTANCE.STATUS.resolve());
 
     }
 

demo/src/main/java/cc/carm/lib/configuration/demo/tests/conf/DemoConfiguration.java

@@ -1,11 +1,7 @@
 package cc.carm.lib.configuration.demo.tests.conf;
 
 import cc.carm.lib.configuration.Configuration;
-import cc.carm.lib.configuration.annotation.ConfigPath;
+import cc.carm.lib.configuration.annotation.*;
-import cc.carm.lib.configuration.annotation.FooterComments;
-import cc.carm.lib.configuration.annotation.HeaderComments;
-import cc.carm.lib.configuration.annotation.InlineComment;
-import cc.carm.lib.configuration.demo.DatabaseConfiguration;
 import cc.carm.lib.configuration.demo.tests.model.ItemStack;
 import cc.carm.lib.configuration.demo.tests.model.UserRecord;
 import cc.carm.lib.configuration.value.ConfigValue;
@@ -29,7 +25,8 @@ import java.util.UUID;
 public interface DemoConfiguration extends Configuration {
 
     @ConfigPath(root = true)
-    ConfigValue<Double> VERSION = ConfiguredValue.of(Double.class, 1.0D);
+    @ConfigVersion(2)
+    ConfigValue<Double> VERSION = ConfiguredValue.of(Double.class, 2.0D);
 
     @ConfigPath(root = true)
     @FooterComments({"此处内容将显示在配置条目的下方", "可用于补充说明，但一般不建议使用"})
@@ -39,10 +36,6 @@ public interface DemoConfiguration extends Configuration {
     @FooterComments({"上述的枚举内容本质上是通过STRING解析的"})
     ConfigValue<ChronoUnit> TEST_ENUM = ConfiguredValue.of(ChronoUnit.class, ChronoUnit.DAYS);
 
-    // 支持通过 Class<?> 变量标注子配置，一并注册。
-    // 注意： 若对应类也有注解，则优先使用类的注解。
-    Class<?> DATABASE = DatabaseConfiguration.class;
-
     @ConfigPath("registered_users") // 通过注解规定配置文件中的路径，若不进行注解则以变量名自动生成。
     @HeaderComments({"Section类型数据测试"}) // 通过注解给配置添加注释。
     @InlineComment("默认地注释会加到Section的首行末尾") // 通过注解给配置添加注释。

demo/src/main/java/cc/carm/lib/configuration/demo/tests/conf/InstanceConfig.java

@@ -8,6 +8,6 @@ import cc.carm.lib.configuration.value.standard.ConfiguredValue;
 @HeaderComments("Inner Test")
 public class InstanceConfig implements Configuration {
 
-    public final ConfigValue<Double> INNER_VALUE = ConfiguredValue.of(1.0D);
+    public final ConfigValue<Double> STATUS = ConfiguredValue.of(1.0D);
 
 }

demo/src/main/java/cc/carm/lib/configuration/demo/tests/conf/RegistryConfig.java

@@ -20,7 +20,7 @@ public class RegistryConfig implements Configuration {
     @FooterComments({"12313213212"})
     @InlineComment(value = "用户名(匹配注释)", regex = "name") // 通过注解给配置添加注释。
     @InlineComment(value = "信息", regex = {"info.*", "info.game.*"}) // 通过注解给配置添加注释。
-    public final ConfigValue<UserRecord> TEST_MODEL = ConfiguredValue.builderOf(UserRecord.class).fromSection()
+    public final ConfigValue<UserRecord> OWNER = ConfiguredValue.builderOf(UserRecord.class).fromSection()
             .defaults(new UserRecord("Carm", UUID.randomUUID()))
             .parse((holder, section) -> UserRecord.deserialize(section))
             .serialize((holder, data) -> data.serialize()).build();

demo/src/main/java/cc/carm/lib/configuration/demo/tests/model/UserRecord.java

@@ -36,6 +36,7 @@ public class UserRecord extends AbstractRecord {
     }
 
     public static UserRecord deserialize(ConfigureSection section) {
+        System.out.println(">  Deserializing  -> " + section.fullPath());
         String name = section.getString("name");
         if (name == null) throw new NullPointerException("name is null");
         String uuidString = section.getString("info.uuid");

features/commentable/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.6</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

features/file/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.6</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

features/section/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.6</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

features/section/src/main/java/cc/carm/lib/configuration/source/section/AbstractMapSection.java

@@ -10,9 +10,11 @@ public abstract class AbstractMapSection<R extends AbstractMapSection<R>> implem
 
     protected final @NotNull Map<String, Object> data;
     protected final @Nullable R parent;
+    protected final @NotNull String path;
 
-    protected AbstractMapSection(@Nullable R parent) {
+    protected AbstractMapSection(@Nullable R parent, @NotNull String path) {
         this.parent = parent;
+        this.path = path;
         this.data = new LinkedHashMap<>();
     }
 
@@ -20,15 +22,17 @@ public abstract class AbstractMapSection<R extends AbstractMapSection<R>> implem
         for (Map.Entry<?, ?> entry : data.entrySet()) {
             String key = (entry.getKey() == null) ? "" : entry.getKey().toString();
             if (entry.getValue() instanceof Map) {
-                this.data.put(key, createSection((Map<?, ?>) entry.getValue()));
+                this.data.put(key, createSection(key, (Map<?, ?>) entry.getValue()));
             } else if (entry.getValue() instanceof List) {
                 List<Object> list = new ArrayList<>();
+                int index = 0;
                 for (Object obj : (List<?>) entry.getValue()) {
                     if (obj instanceof Map) {
-                        list.add(createSection((Map<?, ?>) obj));
+                        list.add(createSection(key + "[" + index + "]", (Map<?, ?>) obj));
                     } else {
                         list.add(obj);
                     }
+                    index++;
                 }
                 this.data.put(key, list);
             } else {
@@ -40,11 +44,11 @@ public abstract class AbstractMapSection<R extends AbstractMapSection<R>> implem
     public abstract @NotNull R self();
 
     @Override
-    public abstract @NotNull R createSection(@NotNull Map<?, ?> data);
+    public abstract @NotNull R createSection(@NotNull String path, @NotNull Map<?, ?> data);
 
     @Override
-    public @NotNull R createSection() {
+    public @NotNull String path() {
-        return createSection(new LinkedHashMap<>());
+        return this.path;
     }
 
     @Override
@@ -63,7 +67,12 @@ public abstract class AbstractMapSection<R extends AbstractMapSection<R>> implem
 
     @Override
     public boolean isEmpty() {
-        return data.isEmpty();
+        return this.data.isEmpty();
+    }
+
+    @Override
+    public int size(boolean deep) {
+        return deep ? getKeys(true).size() : this.data.size();
     }
 
     @UnmodifiableView
@@ -72,6 +81,16 @@ public abstract class AbstractMapSection<R extends AbstractMapSection<R>> implem
         for (Map.Entry<String, Object> entry : this.data.entrySet()) {
             if (entry.getValue() instanceof AbstractMapSection<?>) {
                 output.put(entry.getKey(), ((AbstractMapSection<?>) entry.getValue()).rawMap());
+            } else if (entry.getValue() instanceof List<?>) {
+                List<Object> list = new ArrayList<>();
+                for (Object obj : (List<?>) entry.getValue()) {
+                    if (obj instanceof AbstractMapSection<?>) {
+                        list.add(((AbstractMapSection<?>) obj).rawMap());
+                    } else {
+                        list.add(obj);
+                    }
+                }
+                output.put(entry.getKey(), list);
             } else {
                 output.put(entry.getKey(), entry.getValue());
             }
@@ -86,12 +105,17 @@ public abstract class AbstractMapSection<R extends AbstractMapSection<R>> implem
 
     @Override
     public @NotNull Map<String, Object> getValues(boolean deep) {
-        return Collections.unmodifiableMap(deep ? mappingValues(this, null, true) : data());
+        return Collections.unmodifiableMap(deep ? mappingValues(this, null, true, String.valueOf(pathSeparator())) : data());
+    }
+
+    @Override
+    public @NotNull @UnmodifiableView Set<String> getKeys(boolean deep) {
+        return Collections.unmodifiableSet(deep ? mappingKeys(this, null, true, String.valueOf(pathSeparator())) : data().keySet());
     }
 
     @Override
     public void set(@NotNull String path, @Nullable Object value) {
-        if (value instanceof Map) value = createSection((Map<?, ?>) value);
+        if (value instanceof Map) value = createSection(path, (Map<?, ?>) value);
 
         R section = getSectionFor(path);
         if (section == this) {
@@ -125,7 +149,7 @@ public abstract class AbstractMapSection<R extends AbstractMapSection<R>> implem
         if (index == -1) return self();
 
         String root = path.substring(0, index);
-        return (R) data().computeIfAbsent(root, k -> createSection());
+        return (R) computeSection(root);
     }
 
     /**
@@ -135,18 +159,30 @@ public abstract class AbstractMapSection<R extends AbstractMapSection<R>> implem
      * @param parent  The parent path
      * @param deep    If the mapping should be deep
      */
-    protected Map<String, Object> mappingValues(@NotNull AbstractMapSection<?> section, @Nullable String parent, boolean deep) {
+    protected static Map<String, Object> mappingValues(@NotNull AbstractMapSection<?> section, @Nullable String parent, boolean deep, String pathSeparator) {
         Map<String, Object> output = new LinkedHashMap<>();
         for (Map.Entry<String, Object> entry : section.data().entrySet()) {
-            String path = (parent == null ? "" : parent + pathSeparator()) + entry.getKey();
+            String path = (parent == null ? "" : parent + pathSeparator) + entry.getKey();
             output.remove(path);
             output.put(path, entry.getValue());
             if (deep && entry.getValue() instanceof AbstractMapSection<?>) {
-                output.putAll(mappingValues((AbstractMapSection<?>) entry.getValue(), path, true));
+                output.putAll(mappingValues((AbstractMapSection<?>) entry.getValue(), path, true, pathSeparator));
             }
         }
         return output;
     }
 
+    protected static Set<String> mappingKeys(@NotNull AbstractMapSection<?> section, @Nullable String parent, boolean deep, String pathSeparator) {
+        Set<String> keys = new LinkedHashSet<>();
+        for (Map.Entry<String, Object> entry : section.data().entrySet()) {
+            String path = (parent == null ? "" : parent + pathSeparator) + entry.getKey();
+            keys.add(path);
+            if (deep && entry.getValue() instanceof AbstractMapSection<?>) {
+                keys.addAll(mappingKeys((AbstractMapSection<?>) entry.getValue(), path, true, pathSeparator));
+            }
+        }
+        return keys;
+    }
+
 
 }

features/section/src/main/java/cc/carm/lib/configuration/source/section/ImmutableSection.java

@@ -32,6 +32,11 @@ public class ImmutableSection implements ConfigureSection {
         return this.parent;
     }
 
+    @Override
+    public @NotNull String path() {
+        return section().path();
+    }
+
     private @NotNull ConfigureSection section() {
         return section;
     }
@@ -52,8 +57,8 @@ public class ImmutableSection implements ConfigureSection {
     }
 
     @Override
-    public @NotNull ConfigureSection createSection(@NotNull Map<?, ?> data) {
+    public @NotNull ImmutableSection createSection(@NotNull String path, @NotNull Map<?, ?> data) {
-        return new ImmutableSection(this, section().createSection(data));
+        return new ImmutableSection(this, section().createSection(path, data));
     }
 
     @Override

features/section/src/main/java/cc/carm/lib/configuration/source/section/MemorySection.java

@@ -11,7 +11,7 @@ import java.util.function.Supplier;
 public class MemorySection extends AbstractMapSection<MemorySection> {
 
     public static MemorySection of() {
-        return of((MemorySection) null);
+        return of(new LinkedHashMap<>());
     }
 
     public static MemorySection of(@NotNull Consumer<Map<String, Object>> data) {
@@ -23,23 +23,23 @@ public class MemorySection extends AbstractMapSection<MemorySection> {
     }
 
     public static MemorySection of(@NotNull Supplier<Map<?, ?>> data) {
-        return of(data.get(), null);
+        return of(data.get());
     }
 
     public static MemorySection of(@NotNull Map<?, ?> data) {
-        return of(data, null);
+        return of(data, null, "");
     }
 
-    public static MemorySection of(@Nullable MemorySection parent) {
+    public static MemorySection of(@Nullable MemorySection parent, @NotNull String path) {
-        return of(new LinkedHashMap<>(), parent);
+        return of(new LinkedHashMap<>(), parent, path);
     }
 
-    public static MemorySection of(@NotNull Map<?, ?> data, @Nullable MemorySection parent) {
+    public static MemorySection of(@NotNull Map<?, ?> data, @Nullable MemorySection parent, @NotNull String path) {
-        return new MemorySection(data, parent);
+        return new MemorySection(data, parent, path);
     }
 
-    public MemorySection(@NotNull Map<?, ?> raw, @Nullable MemorySection parent) {
+    public MemorySection(@NotNull Map<?, ?> raw, @Nullable MemorySection parent, @NotNull String path) {
-        super(parent);
+        super(parent, path);
         migrate(raw);
     }
 
@@ -49,8 +49,8 @@ public class MemorySection extends AbstractMapSection<MemorySection> {
     }
 
     @Override
-    public @NotNull MemorySection createSection(@NotNull Map<?, ?> data) {
+    public @NotNull MemorySection createSection(@NotNull String path, @NotNull Map<?, ?> data) {
-        return new MemorySection(data, this);
+        return new MemorySection(data, this, path);
     }
 
 }

features/section/src/main/java/cc/carm/lib/configuration/source/section/ShadedSection.java

@@ -28,6 +28,11 @@ public class ShadedSection implements ConfigureSection {
         return this.parent;
     }
 
+    @Override
+    public @NotNull String path() {
+        return this.template.path();
+    }
+
     @Override
     public @NotNull @UnmodifiableView Map<String, Object> getValues(boolean deep) {
         if (source == null) return template.getValues(deep);
@@ -95,8 +100,13 @@ public class ShadedSection implements ConfigureSection {
     }
 
     @Override
-    public @NotNull ConfigureSection createSection(@NotNull Map<?, ?> data) {
+    public @NotNull ConfigureSection createSection(@NotNull String path, @NotNull Map<?, ?> data) {
-        throw new UnsupportedOperationException("not supported yet");
+        if (source == null) {
+            return new ShadedSection(this, template, MemorySection.of(data));
+        } else {
+            ConfigureSection section = source.computeSection(path, data);
+            return new ShadedSection(this, template, section);
+        }
     }
 
     @Override

features/section/src/main/java/cc/carm/lib/configuration/source/section/SourcedSection.java

@@ -9,19 +9,19 @@ import java.util.Map;
 public class SourcedSection extends AbstractMapSection<SourcedSection> {
 
     public static @NotNull SourcedSection root(@NotNull ConfigureSource<? extends SourcedSection, ?, ?> source) {
-        return new SourcedSection(source, new LinkedHashMap<>(), null);
+        return new SourcedSection(source, new LinkedHashMap<>(), null, "");
     }
 
     public static @NotNull SourcedSection root(@NotNull ConfigureSource<? extends SourcedSection, ?, ?> source,
                                                @Nullable Map<?, ?> raw) {
-        return new SourcedSection(source, raw == null ? new LinkedHashMap<>() : raw, null);
+        return new SourcedSection(source, raw == null ? new LinkedHashMap<>() : raw, null, "");
     }
 
     protected final @NotNull ConfigureSource<? extends SourcedSection, ?, ?> source;
 
     public SourcedSection(@NotNull ConfigureSource<? extends SourcedSection, ?, ?> source,
-                          @NotNull Map<?, ?> raw, @Nullable SourcedSection parent) {
+                          @NotNull Map<?, ?> raw, @Nullable SourcedSection parent, @NotNull String path) {
-        super(parent);
+        super(parent, path);
         this.source = source;
         migrate(raw);
     }
@@ -41,8 +41,8 @@ public class SourcedSection extends AbstractMapSection<SourcedSection> {
     }
 
     @Override
-    public @NotNull SourcedSection createSection(@NotNull Map<?, ?> data) {
+    public @NotNull SourcedSection createSection(@NotNull String path, @NotNull Map<?, ?> data) {
-        return new SourcedSection(source(), data, this);
+        return new SourcedSection(source(), data, this, path);
     }
 
 }

features/text/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.6</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

features/versioned/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <groupId>cc.carm.lib</groupId>
         <artifactId>easyconfiguration-parent</artifactId>
-        <version>4.0.6</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>

features/versioned/src/main/java/cc/carm/lib/configuration/annotation/ConfigVersion.java

@@ -1,6 +1,5 @@
 package cc.carm.lib.configuration.annotation;
 
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Range;
 
 import java.lang.annotation.ElementType;
@@ -22,7 +21,7 @@ public @interface ConfigVersion {
      *
      * @return the version of the configuration field
      */
-    @Range(from = 0, to = Integer.MAX_VALUE)
+    @Range(from = 0, to = 65535)
     int value() default 0;
 
 }

features/versioned/src/main/java/cc/carm/lib/configuration/option/VersionedOptions.java

@@ -1,13 +0,0 @@
-package cc.carm.lib.configuration.option;
-
-import cc.carm.lib.configuration.source.option.ConfigurationOption;
-
-public interface VersionedOptions {
-
-    /**
-     * Whether to set newer defaults when a {@link cc.carm.lib.configuration.value.ConfigValue}'s marked version
-     * is newer than the current in storage.
-     */
-    ConfigurationOption<Boolean> RESET_NEWER_DEFAULTS = ConfigurationOption.of(true);
-
-}

features/versioned/src/main/java/cc/carm/lib/configuration/versioned/VersionedMetaTypes.java

@@ -1,4 +1,4 @@
-package cc.carm.lib.configuration.commentable;
+package cc.carm.lib.configuration.versioned;
 
 import cc.carm.lib.configuration.annotation.ConfigVersion;
 import cc.carm.lib.configuration.source.ConfigurationHolder;
@@ -19,7 +19,18 @@ public interface VersionedMetaTypes {
     }
 
     static void register(@NotNull ConfigurationInitializer initializer) {
-        initializer.registerFieldAnnotation(ConfigVersion.class, VERSION, ConfigVersion::value);
+        initializer.appendFieldInitializer((holder, path, field, value) -> {
+            ConfigVersion annotation = field.getAnnotation(ConfigVersion.class);
+            if (annotation == null || value == null) return;
+            int currentVersion = annotation.value();
+            int savedVersion = holder.metadata(path).get(VERSION, 0);
+            if (currentVersion == savedVersion) return;
+
+            if (currentVersion > savedVersion) { // This values updated.
+                value.setDefault(true); // Mark as default value, force write.
+            }
+            holder.metadata(path).set(VERSION, currentVersion);
+        });
     }
 
 }

pom.xml

@@ -15,7 +15,7 @@
     <groupId>cc.carm.lib</groupId>
     <artifactId>easyconfiguration-parent</artifactId>
     <packaging>pom</packaging>
-    <version>4.0.6</version>
+    <version>4.0.8</version>
     <modules>
         <module>core</module>
         <module>features/section</module>
@@ -27,8 +27,8 @@
         <module>providers/yaml</module>
         <module>providers/gson</module>
         <!--        <module>providers/hocon</module>-->
-        <!--        <module>providers/sql</module>-->
+        <module>providers/sql</module>
-        <!--        <module>providers/mongodb</module>-->
+        <module>providers/mongodb</module>
 
         <module>demo</module>
     </modules>
@@ -89,12 +89,6 @@
             <url>https://repo1.maven.org/maven2/</url>
         </repository>
 
-        <repository>
-            <id>github</id>
-            <name>GitHub Packages</name>
-            <url>https://maven.pkg.github.com/CarmJos/*</url>
-        </repository>
-
     </repositories>
 
     <distributionManagement>

providers/gson/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.6</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>

providers/mongodb/pom.xml

@@ -5,7 +5,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.0</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
@@ -15,6 +15,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
 
+        <deps.mongodb.version>5.3.1</deps.mongodb.version>
         <log4j.version>2.24.3</log4j.version>
     </properties>
     <artifactId>easyconfiguration-mongodb</artifactId>
@@ -30,7 +31,7 @@
 
         <dependency>
             <groupId>${project.parent.groupId}</groupId>
-            <artifactId>easyconfiguration-gson</artifactId>
+            <artifactId>easyconfiguration-feature-section</artifactId>
             <version>${project.parent.version}</version>
             <scope>compile</scope>
         </dependency>
@@ -38,14 +39,7 @@
         <dependency>
             <groupId>org.mongodb</groupId>
             <artifactId>mongodb-driver-sync</artifactId>
-            <version>5.3.1</version>
+            <version>${deps.mongodb.version}</version>
-        </dependency>
-
-        <dependency>
-            <groupId>${project.parent.groupId}</groupId>
-            <artifactId>easyconfiguration-demo</artifactId>
-            <version>${project.parent.version}</version>
-            <scope>test</scope>
         </dependency>
 
         <dependency>
@@ -69,6 +63,20 @@
             <scope>test</scope>
         </dependency>
 
+        <dependency>
+            <groupId>${project.parent.groupId}</groupId>
+            <artifactId>easyconfiguration-demo</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>${project.parent.groupId}</groupId>
+            <artifactId>easyconfiguration-gson</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>test</scope>
+        </dependency>
+
     </dependencies>
 
     <build>

providers/mongodb/src/main/java/cc/carm/lib/configuration/source/mongodb/MongoConfigFactory.java

@@ -0,0 +1,75 @@
+package cc.carm.lib.configuration.source.mongodb;
+
+import cc.carm.lib.configuration.source.ConfigurationFactory;
+import cc.carm.lib.configuration.source.ConfigurationHolder;
+import com.mongodb.client.MongoCollection;
+import com.mongodb.client.MongoDatabase;
+import org.bson.Document;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.function.Supplier;
+
+public class MongoConfigFactory extends ConfigurationFactory<MongoSource, ConfigurationHolder<MongoSource>, MongoConfigFactory> {
+
+    public static MongoConfigFactory from(@NotNull Supplier<MongoCollection<Document>> collectionSupplier) {
+        return new MongoConfigFactory(collectionSupplier);
+    }
+
+    public static MongoConfigFactory from(@NotNull MongoCollection<Document> collection) {
+        return from(() -> collection);
+    }
+
+    public static MongoConfigFactory from(@NotNull MongoDatabase database, @NotNull String collectionName) {
+        return from(() -> database.getCollection(collectionName));
+    }
+
+    protected @NotNull Supplier<MongoCollection<Document>> collectionSupplier;
+    protected @NotNull String namespace = "config";
+
+    public MongoConfigFactory(@NotNull Supplier<MongoCollection<Document>> collectionSupplier) {
+        super();
+        this.collectionSupplier = collectionSupplier;
+    }
+
+    public MongoConfigFactory collection(@NotNull Supplier<MongoCollection<Document>> collectionSupplier) {
+        this.collectionSupplier = collectionSupplier;
+        return this;
+    }
+
+    public MongoConfigFactory collection(@NotNull MongoCollection<Document> collection) {
+        return collection(() -> collection);
+    }
+
+    public MongoConfigFactory namespace(@NotNull String namespace) {
+        this.namespace = namespace;
+        return this;
+    }
+
+    public MongoConfigFactory namespace(@NotNull Supplier<String> namespace) {
+        return namespace(namespace.get());
+    }
+
+
+    @Override
+    protected MongoConfigFactory self() {
+        return this;
+    }
+
+    @Override
+    public @NotNull ConfigurationHolder<MongoSource> build() {
+        MongoCollection<Document> collection = this.collectionSupplier.get();
+        if (collection == null) {
+            throw new IllegalStateException("Failed to get MongoCollection<Document> from supplier");
+        }
+
+        return new ConfigurationHolder<MongoSource>(this.adapters, this.options, this.metadata, this.initializer) {
+            final @NotNull MongoSource source = new MongoSource(this, System.currentTimeMillis(), collection, namespace);
+
+            @Override
+            public @NotNull MongoSource config() {
+                return this.source;
+            }
+        };
+    }
+
+}

providers/mongodb/src/main/java/cc/carm/lib/configuration/source/mongodb/MongoSource.java

@@ -1,4 +1,76 @@
 package cc.carm.lib.configuration.source.mongodb;
 
-public class MongoSource {
+import cc.carm.lib.configuration.source.ConfigurationHolder;
+import cc.carm.lib.configuration.source.section.ConfigureSource;
+import cc.carm.lib.configuration.source.section.SourcedSection;
+import com.mongodb.client.MongoCollection;
+import com.mongodb.client.model.ReplaceOptions;
+import org.bson.Document;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Map;
+import java.util.Objects;
+
+public class MongoSource extends ConfigureSource<SourcedSection, Map<String, Object>, MongoSource> {
+
+    protected final @NotNull MongoCollection<Document> collection;
+    protected final @NotNull String namespace;
+
+    protected SourcedSection rootSection;
+
+    protected MongoSource(@NotNull ConfigurationHolder<? extends MongoSource> holder, long lastUpdateMillis,
+                          @NotNull MongoCollection<Document> collection, @NotNull String namespace) {
+        super(holder, lastUpdateMillis);
+        this.collection = collection;
+        this.namespace = namespace;
+        try {
+            onReload();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Override
+    protected @NotNull MongoSource self() {
+        return this;
+    }
+
+    @Override
+    public @NotNull Map<String, Object> original() {
+        return section().data();
+    }
+
+    @Override
+    public @NotNull SourcedSection section() {
+        return Objects.requireNonNull(rootSection, "RootSection is not initialized");
+    }
+
+    public @NotNull String namespace() {
+        return this.namespace;
+    }
+
+    public @NotNull MongoCollection<Document> collection() {
+        return this.collection;
+    }
+
+    @Override
+    public void save() throws Exception {
+        Map<String, Object> data = this.rootSection.rawMap();
+        if (data.isEmpty()) return; // Skip saving if empty
+        if (data.containsKey("_id") && data.size() == 1) return; // Skip saving if only contains _id
+
+        ReplaceOptions options = new ReplaceOptions().upsert(true);
+        Document storage = new Document(data).append("_id", this.namespace);
+        this.collection.replaceOne(new Document("_id", this.namespace), storage, options);
+    }
+
+    @Override
+    protected void onReload() throws Exception {
+        Document storage = this.collection.find(new Document("_id", this.namespace)).first();
+        if (storage == null) storage = new Document();
+        else storage.remove("_id"); // Remove _id
+        this.rootSection = SourcedSection.root(this, storage);
+    }
+
+
 }

providers/mongodb/src/test/java/config/MongoConfig.java

@@ -0,0 +1,12 @@
+package config;
+
+import cc.carm.lib.configuration.Configuration;
+import cc.carm.lib.configuration.value.standard.ConfiguredValue;
+
+interface MongoConfig extends Configuration {
+    ConfiguredValue<String> HOST = ConfiguredValue.of("127.0.0.1");
+    ConfiguredValue<Integer> PORT = ConfiguredValue.of(27017);
+    ConfiguredValue<String> USERNAME = ConfiguredValue.of("minecraft");
+    ConfiguredValue<String> PASSWORD = ConfiguredValue.of("minecraft");
+    ConfiguredValue<String> DATABASE = ConfiguredValue.of("minecraft");
+}

providers/mongodb/src/test/java/config/MongoTest.java

@@ -0,0 +1,57 @@
+package config;
+
+import cc.carm.lib.configuration.demo.tests.ConfigurationTest;
+import cc.carm.lib.configuration.source.ConfigurationHolder;
+import cc.carm.lib.configuration.source.json.JSONConfigFactory;
+import cc.carm.lib.configuration.source.mongodb.MongoConfigFactory;
+import com.mongodb.ConnectionString;
+import com.mongodb.MongoClientSettings;
+import com.mongodb.MongoCredential;
+import com.mongodb.client.MongoClient;
+import com.mongodb.client.MongoClients;
+import com.mongodb.client.MongoDatabase;
+import org.bson.UuidRepresentation;
+import org.junit.Test;
+
+import java.io.File;
+
+public class MongoTest {
+
+    boolean local = false;
+
+    @Test
+    public void test() {
+
+        if (!local) return;
+
+        ConfigurationHolder<?> gsonHolder = JSONConfigFactory.from(new File("target/mongo.json")).build();
+        gsonHolder.initialize(MongoConfig.class);
+
+        MongoClientSettings settings = MongoClientSettings.builder()
+                .applyConnectionString(new ConnectionString(
+                        "mongodb://" + MongoConfig.HOST.resolve() + ":" + MongoConfig.PORT.resolve()
+                ))
+                .credential(MongoCredential.createCredential(
+                        MongoConfig.USERNAME.resolve(), MongoConfig.DATABASE.resolve(),
+                        MongoConfig.PASSWORD.resolve().toCharArray()
+                ))
+                .uuidRepresentation(UuidRepresentation.STANDARD)
+                .build();
+        MongoClient mongoClient = MongoClients.create(settings);
+        MongoDatabase mongoDatabase = mongoClient.getDatabase(MongoConfig.DATABASE.resolve());
+
+        ConfigurationHolder<?> mongoHolder = MongoConfigFactory
+                .from(mongoDatabase, "configs")
+                .namespace("my_plugin")
+                .build();
+
+        // Test the configuration
+        ConfigurationTest.testDemo(mongoHolder);
+        ConfigurationTest.testInner(mongoHolder);
+
+        ConfigurationTest.save(mongoHolder);
+
+    }
+
+
+}

providers/sql/README.md

@@ -6,16 +6,16 @@ SQL database implementation, support for MySQL or MariaDB.
 ```mysql
 CREATE TABLE IF NOT EXISTS conf
 (
-    `namespace`      VARCHAR(32)      NOT NULL,                           # 命名空间 (代表其属于谁，类似于单个配置文件地址的概念)
+    `namespace`      VARCHAR(32)        NOT NULL,                           # 命名空间 (代表其属于谁，类似于单个配置文件地址的概念)
-    `path`           VARCHAR(96)      NOT NULL,                           # 配置路径 (ConfigPath)
+    `path`           VARCHAR(96)        NOT NULL,                           # 配置路径 (ConfigPath)
-    `type`           TINYINT UNSIGNED NOT NULL DEFAULT 0,                 # 数据类型 (Integer/Byte/List/Map/...)
+    `type`           TINYINT UNSIGNED   NOT NULL DEFAULT 0,                 # 数据类型 (Integer/Byte/List/Map/...)
-    `value`          MEDIUMTEXT,                                          # 配置项的值 (可能为JSON格式)
+    `value`          MEDIUMTEXT,                                            # 配置项的值 (可能为JSON格式)
-    `inline_comment` TEXT,                                                # 配置项的用法，本质是行内注释
+    `inline_comment` TEXT comment 'usage',                                  # 配置项的用法，本质是行内注释
-    `header_comment` MEDIUMTEXT,                                          # 配置项的描述，本质是顶部注释
+    `header_comment` MEDIUMTEXT comment 'description',                      # 配置项的描述，本质是顶部注释
-    `footer_comment` MEDIUMTEXT,                                          # 配置项的描述，本质是顶部注释
+    `footer_comment` MEDIUMTEXT comment 'example',                          # 配置项的参考，本质是底部注释
-    `version`        INT UNSIGNED     NOT NULL DEFAULT 0,                 # 配置项的版本
+    `version`        MEDIUMINT UNSIGNED NOT NULL DEFAULT 0,                 # 配置项的版本
-    `create_time`    DATETIME         NOT NULL DEFAULT CURRENT_TIMESTAMP, # 创建时间
+    `create_time`    DATETIME           NOT NULL DEFAULT CURRENT_TIMESTAMP, # 创建时间
-    `update_time`    DATETIME         NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
+    `update_time`    DATETIME           NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
     PRIMARY KEY (`namespace`, `path`)
 ) ENGINE = InnoDB
   DEFAULT CHARSET = utf8mb4;

providers/sql/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.0</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>
@@ -15,7 +15,8 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.encoding>UTF-8</maven.compiler.encoding>
 
-        <log4j.version>2.24.3</log4j.version>
+        <deps.mysql-driver.version>8.0.33</deps.mysql-driver.version>
+        <deps.log4j.version>2.24.3</deps.log4j.version>
     </properties>
     <artifactId>easyconfiguration-sql</artifactId>
 
@@ -77,21 +78,35 @@
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-api</artifactId>
-            <version>${log4j.version}</version>
+            <version>${deps.log4j.version}</version>
             <scope>test</scope>
         </dependency>
 
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-core</artifactId>
-            <version>${log4j.version}</version>
+            <version>${deps.log4j.version}</version>
             <scope>test</scope>
         </dependency>
 
         <dependency>
             <groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-slf4j-impl</artifactId>
-            <version>${log4j.version}</version>
+            <version>${deps.log4j.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>${project.parent.groupId}</groupId>
+            <artifactId>easyconfiguration-gson</artifactId>
+            <version>${project.parent.version}</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>${deps.mysql-driver.version}</version>
             <scope>test</scope>
         </dependency>
 

providers/sql/src/main/java/cc/carm/lib/configuration/source/sql/SQLConfigFactory.java

@@ -0,0 +1,133 @@
+package cc.carm.lib.configuration.source.sql;
+
+import cc.carm.lib.configuration.adapter.ValueType;
+import cc.carm.lib.configuration.commentable.Commentable;
+import cc.carm.lib.configuration.function.DataFunction;
+import cc.carm.lib.configuration.source.ConfigurationFactory;
+import cc.carm.lib.configuration.source.ConfigurationHolder;
+import cc.carm.lib.configuration.versioned.VersionedMetaTypes;
+import cc.carm.lib.easysql.api.SQLManager;
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Range;
+
+import java.util.HashMap;
+import java.util.function.Consumer;
+import java.util.function.Supplier;
+
+public class SQLConfigFactory extends ConfigurationFactory<SQLSource, ConfigurationHolder<SQLSource>, SQLConfigFactory> {
+
+    public static SQLConfigFactory from(@NotNull Supplier<@NotNull SQLManager> managerSupplier) {
+        return new SQLConfigFactory(managerSupplier);
+    }
+
+    public static SQLConfigFactory from(@NotNull SQLManager manager) {
+        return from(() -> manager);
+    }
+
+    protected @NotNull Supplier<SQLManager> managerSupplier;
+    protected Supplier<Gson> gsonSupplier = () -> SQLSource.DEFAULT_GSON;
+
+    protected HashMap<Integer, SQLValueResolver<?>> resolvers = new HashMap<>(SQLValueResolver.STANDARD_RESOLVERS);
+    protected String tableName = "configs";
+    protected String namespace = "default";
+
+    public SQLConfigFactory(@NotNull Supplier<SQLManager> managerSupplier) {
+        this.managerSupplier = managerSupplier;
+    }
+
+    @Override
+    protected SQLConfigFactory self() {
+        return this;
+    }
+
+    public SQLConfigFactory manager(@NotNull Supplier<SQLManager> managerSupplier) {
+        this.managerSupplier = managerSupplier;
+        return self();
+    }
+
+    public SQLConfigFactory manager(@NotNull SQLManager manager) {
+        return manager(() -> manager);
+    }
+
+    public SQLConfigFactory gson(@NotNull Supplier<Gson> gsonSupplier) {
+        this.gsonSupplier = gsonSupplier;
+        return self();
+    }
+
+    public SQLConfigFactory gson(@NotNull Consumer<GsonBuilder> builder) {
+        return gson(() -> {
+            GsonBuilder gsonBuilder = new GsonBuilder();
+            builder.accept(gsonBuilder);
+            return gsonBuilder.create();
+        });
+    }
+
+    public SQLConfigFactory gson(@NotNull Gson gson) {
+        return gson(() -> gson);
+    }
+
+    public SQLConfigFactory resolver(@Range(from = 0, to = 255) int type, @NotNull SQLValueResolver<?> resolver) {
+        this.resolvers.put(type, resolver);
+        return self();
+    }
+
+    public <T> SQLConfigFactory resolver(@Range(from = 0, to = 255) int id, @NotNull Class<T> clazz,
+                                         @NotNull DataFunction<String, T> parser) {
+        return resolver(id, ValueType.of(clazz), parser);
+    }
+
+    public <T> SQLConfigFactory resolver(@Range(from = 0, to = 255) int id, @NotNull ValueType<T> type,
+                                         @NotNull DataFunction<String, T> parser) {
+        return resolver(id, SQLValueResolver.of(type, parser));
+    }
+
+    public <T> SQLConfigFactory resolver(@Range(from = 0, to = 255) int id, @NotNull Class<T> clazz,
+                                         @NotNull DataFunction<String, T> parser,
+                                         @NotNull DataFunction<T, String> serializer) {
+        return resolver(id, ValueType.of(clazz), parser, serializer);
+    }
+
+    public <T> SQLConfigFactory resolver(@Range(from = 0, to = 255) int id, @NotNull ValueType<T> type,
+                                         @NotNull DataFunction<String, T> parser,
+                                         @NotNull DataFunction<T, String> serializer) {
+        return resolver(id, SQLValueResolver.of(type, parser, serializer));
+    }
+
+    public SQLConfigFactory tableName(@NotNull String tableName) {
+        this.tableName = tableName;
+        return self();
+    }
+
+    public SQLConfigFactory namespace(@NotNull String namespace) {
+        this.namespace = namespace;
+        return self();
+    }
+
+    @Override
+    public @NotNull ConfigurationHolder<SQLSource> build() {
+        Gson gson = gsonSupplier.get();
+        if (gson == null) throw new NullPointerException("No Gson instance provided.");
+
+        SQLManager manager = this.managerSupplier.get();
+        if (manager == null) throw new NullPointerException("No SQLManager instance provided.");
+
+        Commentable.registerMeta(this.initializer);
+        VersionedMetaTypes.register(this.initializer);
+
+        return new ConfigurationHolder<SQLSource>(this.adapters, this.options, this.metadata, this.initializer) {
+            final SQLSource source = new SQLSource(
+                    this, System.currentTimeMillis(),
+                    gson, manager, resolvers, tableName, namespace
+            );
+
+            @Override
+            public @NotNull SQLSource config() {
+                return source;
+            }
+        };
+    }
+
+
+}

providers/sql/src/main/java/cc/carm/lib/configuration/source/sql/SQLOptions.java

@@ -1,6 +1,12 @@
 package cc.carm.lib.configuration.source.sql;
 
+import cc.carm.lib.configuration.source.option.ConfigurationOption;
+
 public interface SQLOptions {
 
+    /**
+     * Whether to purge the configuration's in-database data when saving.
+     */
+    ConfigurationOption<Boolean> PURGE = ConfigurationOption.of( true);
 
 }

providers/sql/src/main/java/cc/carm/lib/configuration/source/sql/SQLSource.java

@@ -1,53 +1,62 @@
 package cc.carm.lib.configuration.source.sql;
 
+import cc.carm.lib.configuration.commentable.Commentable;
 import cc.carm.lib.configuration.source.ConfigurationHolder;
 import cc.carm.lib.configuration.source.section.ConfigureSource;
-import cc.carm.lib.configuration.source.section.MemorySection;
+import cc.carm.lib.configuration.source.section.SourcedSection;
+import cc.carm.lib.configuration.value.ConfigValue;
+import cc.carm.lib.configuration.versioned.VersionedMetaTypes;
 import cc.carm.lib.easysql.api.SQLManager;
+import cc.carm.lib.easysql.api.SQLQuery;
 import cc.carm.lib.easysql.api.SQLTable;
 import cc.carm.lib.easysql.api.enums.IndexType;
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
+import java.sql.ResultSet;
+import java.time.LocalDateTime;
 import java.util.*;
 
-public class SQLSource extends ConfigureSource<MemorySection, Map<?, ?>, SQLSource> {
+public class SQLSource extends ConfigureSource<SourcedSection, Map<String, Object>, SQLSource> {
 
     protected static final @NotNull Gson DEFAULT_GSON = new GsonBuilder()
-            .serializeNulls().disableHtmlEscaping().setPrettyPrinting()
+            .serializeNulls().disableHtmlEscaping().create();
-            .create();
 
     protected final @NotNull Gson gson;
     protected final @NotNull SQLManager sqlManager;
     protected final @NotNull String namespace;
     protected final @NotNull SQLTable table;
 
-    protected final @NotNull Set<String> updated = new HashSet<>();
+    protected final @NotNull Map<Integer, SQLValueResolver<?>> resolvers;
-    protected MemorySection rootSection;
+    protected SourcedSection rootSection;
 
     public SQLSource(@NotNull ConfigurationHolder<? extends SQLSource> holder, long lastUpdateMillis,
-                     @NotNull Gson gson, @NotNull SQLManager sqlManager, @NotNull String tableName, @NotNull String namespace) {
+                     @NotNull Gson gson, @NotNull SQLManager sqlManager,
+                     @NotNull Map<Integer, SQLValueResolver<?>> resolvers,
+                     @NotNull String tableName, @NotNull String namespace) {
         super(holder, lastUpdateMillis);
         this.gson = gson;
         this.sqlManager = sqlManager;
+        this.resolvers = resolvers;
         this.namespace = namespace;
         this.table = SQLTable.of(tableName, builder -> {
 
             builder.addColumn("namespace", "VARCHAR(32) NOT NULL");
             builder.addColumn("path", "VARCHAR(96) NOT NULL");
 
-            builder.addColumn("type", "TINYINT NOT NULL DEFAULT 0");
             builder.addColumn("value", "TEXT");
 
             builder.addColumn("inline_comment", "TEXT");
             builder.addColumn("header_comments", "MEDIUMTEXT");
             builder.addColumn("footer_comments", "MEDIUMTEXT");
 
+            builder.addColumn("type", "TINYINT NOT NULL DEFAULT 0");
             builder.addColumn("version", "MEDIUMINT UNSIGNED NOT NULL DEFAULT 0");
 
-            builder.addColumn("create_time", "TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP");
+            builder.addColumn("create_time", "TIMESTAMP NOT NULL");
-            builder.addColumn("update_time", "TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP");
+            builder.addColumn("update_time", "TIMESTAMP NOT NULL");
 
             builder.setIndex(
                     IndexType.PRIMARY_KEY, "pk_" + tableName.toLowerCase(),
@@ -55,82 +64,134 @@ public class SQLSource extends ConfigureSource<MemorySection, Map<?, ?>, SQLSour
             );
             builder.setTableSettings("ENGINE=InnoDB DEFAULT CHARSET=utf8mb4");
         });
+
+        try {
+            this.table.create(this.sqlManager);
+            onReload();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
     }
 
     @Override
-    protected SQLSource self() {
+    protected @NotNull SQLSource self() {
         return this;
     }
 
+    public @NotNull Gson gson() {
+        return gson;
+    }
+
     @Override
-    public @NotNull Map<?, ?> original() {
+    public @NotNull Map<String, Object> original() {
         return section().data();
     }
 
     @Override
-    public @NotNull MemorySection section() {
+    public @NotNull SourcedSection section() {
         return Objects.requireNonNull(this.rootSection, "Root section is not initialized.");
     }
 
+    public int purge() throws Exception {
+        return this.table.createDelete().addCondition("namespace", namespace).build().execute();
+    }
+
     @Override
     public void save() throws Exception {
-        if (this.updated.isEmpty()) return; // Nothing to save
+        LocalDateTime time = LocalDateTime.now(); // Update time
+        List<Object[]> dataValues = new ArrayList<>();
 
-        Date date = new Date(); // Update time
+        SourcedSection section = section();
-        List<Object[]> values = new ArrayList<>();
+        Map<String, ConfigValue<?>> values = holder().registeredValues();
+        for (Map.Entry<String, ConfigValue<?>> entry : values.entrySet()) {
+            @NotNull String path = entry.getKey();
+            @NotNull ConfigValue<?> config = entry.getValue();
+            @Nullable Object value = section.get(path);
 
-        for (String path : this.updated) {
+            if (value instanceof SourcedSection) {
-            Object value = get(path);
+                value = ((SourcedSection) value).rawMap();
+            } else if (value instanceof List<?>) {
+                List<Object> list = new ArrayList<>();
+                for (Object obj : (List<?>) value) {
+                    if (obj instanceof SourcedSection) {
+                        list.add(((SourcedSection) obj).rawMap());
+                    } else {
+                        list.add(obj);
+                    }
+                }
+                value = list;
+            }
 
-//            if (value instanceof SQLConfigWrapper) {
+            if (value == null) continue;
-//                value = getSourceMap(((SQLConfigWrapper) value).getSource());
+
-//            }
+            try {
-//
+                int typeID = typeIdOf(value);
-//            SQLValueResolver<?> type = SQLValueTypes.get(value.getClass());
+                String data = serialize(typeID, value);
-//            if (type != null) {
+                if (data == null) continue;
-//                values.add(new Object[]{
+
-//                        this.namespace, path, date,
+                int version = holder().metadata(path).get(VersionedMetaTypes.VERSION, 0);
-//                        type.getID(), type.serializeObject(value),
+                dataValues.add(new Object[]{
-//                        getComments().getInlineComment(path),
+                        namespace, path, time, version, typeID, data,
-//                        GSON.toJson(getComments().getHeaderComment(path))
+                        Commentable.getInlineComment(holder(), path),
-//                });
+                        gson.toJson(Commentable.getHeaderComments(holder(), path)),
-//            }
+                        gson.toJson(Commentable.getFooterComments(holder(), path))
+                });
+            } catch (Exception ex) {
+                ex.printStackTrace();
+            }
         }
 
-        this.updated.clear();
+        if (holder.option(SQLOptions.PURGE)) {
-
+            purge();
+        }
         this.table.createReplaceBatch()
-                .setColumnNames("namespace", "path", "update_time", "type", "value", "inline_comment", "header_comments")
+                .setColumnNames(
-                .setAllParams(values)
+                        "namespace", "path", "update_time", "version", "type", "value",
-                .execute();
+                        "inline_comment", "header_comments", "footer_comments"
+                ).setAllParams(dataValues).execute();
     }
 
     @Override
     protected void onReload() throws Exception {
-        LinkedHashMap<String, Object> values = new LinkedHashMap<>();
+        Map<String, Object> loaded = new LinkedHashMap<>();
-
+        try (SQLQuery query = this.table.createQuery()
-//        try (SQLQuery query = this.table.createQuery()
+                .addCondition("namespace", namespace)
-//                .addCondition("namespace", namespace)
+                .build().execute()) {
-//                .build().execute()) {
+            ResultSet rs = query.getResultSet();
-//            ResultSet rs = query.getResultSet();
+            while (rs.next()) {
-//            while (rs.next()) {
+                String path = rs.getString("path");
-//                String path = rs.getString("path");
+                if (path == null) continue; // Path should be not null
-//                int type = rs.getInt("type");
+                int ver = rs.getInt("version");
-//                try {
+                try {
-//                    SQLValueResolver<?> resolver = SQLValueTypes.get(type);
+                    loaded.put(path, parse(rs.getInt("type"), rs.getString("value")));
-//                    if (resolver == null) throw new IllegalStateException("No resolver for type #" + type);
+                    if (ver != 0) holder().metadata(path).set(VersionedMetaTypes.VERSION, ver);
-//                    String value = rs.getString("value");
+                } catch (Exception e) {
-//                    values.put(path, resolver.resolve(value));
+                    e.printStackTrace();
-//
+                }
-//                    loadInlineComment(path, rs.getString("inline_comment"));
+            }
-//                    loadHeaderComment(path, rs.getString("header_comments"));
+        }
-//                } catch (Exception ex) {
+        this.rootSection = SourcedSection.root(this, loaded);
-//                    ex.printStackTrace();
-//                }
-//            }
-//        }
-//
-//        this.rootConfiguration = new SQLConfigWrapper(this, values);
     }
 
+
+    protected @Nullable Object parse(int type, String value) throws Exception {
+        SQLValueResolver<?> function = this.resolvers.get(type);
+        if (function == null) throw new IllegalStateException("No resolvers for type #" + type);
+        return function.resolve(this, value);
+    }
+
+    protected @Nullable String serialize(int type, @NotNull Object value) throws Exception {
+        SQLValueResolver<?> function = this.resolvers.get(type);
+        if (function == null) throw new IllegalStateException("No resolvers for type #" + type);
+        return function.serialize(this, value);
+    }
+
+    protected int typeIdOf(@NotNull Object value) {
+        return this.resolvers.entrySet().stream()
+                .filter(entry -> entry.getValue().isInstance(value))
+                .findFirst().map(Map.Entry::getKey)
+                .orElseThrow(() -> new IllegalStateException("No resolvers for value " + value.getClass().getName()));
+    }
+
+
 }

providers/sql/src/main/java/cc/carm/lib/configuration/source/sql/SQLValueResolver.java

@@ -0,0 +1,115 @@
+package cc.carm.lib.configuration.source.sql;
+
+import cc.carm.lib.configuration.adapter.ValueType;
+import cc.carm.lib.configuration.function.DataFunction;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Collections;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+public abstract class SQLValueResolver<T> {
+
+    public static final @NotNull SQLValueResolver<String> STRING = SQLValueResolver.of(ValueType.STRING, s -> s);
+    public static final @NotNull SQLValueResolver<Byte> BYTE = SQLValueResolver.of(ValueType.BYTE, Byte::parseByte);
+    public static final @NotNull SQLValueResolver<Short> SHORT = SQLValueResolver.of(ValueType.SHORT, Short::parseShort);
+    public static final @NotNull SQLValueResolver<Integer> INTEGER = SQLValueResolver.of(ValueType.INTEGER, Integer::parseInt);
+    public static final @NotNull SQLValueResolver<Long> LONG = SQLValueResolver.of(ValueType.LONG, Long::parseLong);
+    public static final @NotNull SQLValueResolver<Float> FLOAT = SQLValueResolver.of(ValueType.FLOAT, Float::parseFloat);
+    public static final @NotNull SQLValueResolver<Double> DOUBLE = SQLValueResolver.of(ValueType.DOUBLE, Double::parseDouble);
+    public static final @NotNull SQLValueResolver<Boolean> BOOLEAN = SQLValueResolver.of(ValueType.BOOLEAN, Boolean::parseBoolean);
+    public static final @NotNull SQLValueResolver<Character> CHAR = SQLValueResolver.of(ValueType.CHAR, s -> s.charAt(0));
+
+    public static final @NotNull SQLValueResolver<List<?>> LIST = new SQLValueResolver<List<?>>(new ValueType<List<?>>() {
+    }) {
+        @Override
+        public @Nullable List<?> resolve(@NotNull SQLSource source, String data) throws Exception {
+            return source.gson().fromJson(data, List.class);
+        }
+
+        @Override
+        public @Nullable String serialize(@NotNull SQLSource source, Object value) {
+            return source.gson().toJson(value);
+        }
+    };
+
+    public static final @NotNull SQLValueResolver<Map<?, ?>> MAP = new SQLValueResolver<Map<?, ?>>(new ValueType<Map<?, ?>>() {
+    }) {
+        @Override
+        public @Nullable Map<?, ?> resolve(@NotNull SQLSource source, String data) throws Exception {
+            return source.gson().fromJson(data, LinkedHashMap.class);
+        }
+
+        @Override
+        public @Nullable String serialize(@NotNull SQLSource source, Object value) {
+            return source.gson().toJson(value);
+        }
+    };
+
+    public static final @NotNull Map<Integer, SQLValueResolver<?>> STANDARD_RESOLVERS = Collections.unmodifiableMap(standards());
+
+    static Map<Integer, SQLValueResolver<?>> standards() {
+        Map<Integer, SQLValueResolver<?>> map = new LinkedHashMap<>();
+        map.put(0, STRING);
+        map.put(1, BYTE);
+        map.put(2, SHORT);
+        map.put(3, INTEGER);
+        map.put(4, LONG);
+        map.put(5, FLOAT);
+        map.put(6, DOUBLE);
+        map.put(7, BOOLEAN);
+        map.put(8, CHAR);
+        map.put(10, LIST);
+        map.put(11, MAP);
+        return map;
+    }
+
+    public static <V> SQLValueResolver<V> of(@NotNull ValueType<V> type, @NotNull DataFunction<String, V> resolver) {
+        return new SQLValueResolver<V>(type) {
+            @Override
+            public @NotNull V resolve(@NotNull SQLSource source, String data) throws Exception {
+                return resolver.handle(data);
+            }
+        };
+    }
+
+    public static <V> SQLValueResolver<V> of(@NotNull ValueType<V> type,
+                                             @NotNull DataFunction<String, V> resolver,
+                                             @NotNull DataFunction<V, String> serializer) {
+        return new SQLValueResolver<V>(type) {
+            @Override
+            public @NotNull V resolve(@NotNull SQLSource source, String data) throws Exception {
+                return resolver.handle(data);
+            }
+
+            @Override
+            public @NotNull String serialize(@NotNull SQLSource source, Object value) throws Exception {
+                return serializer.handle(type.cast(value));
+            }
+        };
+    }
+
+
+    protected final @NotNull ValueType<T> type;
+
+    protected SQLValueResolver(@NotNull ValueType<T> type) {
+        this.type = type;
+    }
+
+    public @NotNull ValueType<T> getType() {
+        return type;
+    }
+
+    public boolean isInstance(@NotNull Object obj) {
+        return getType().isInstance(obj);
+    }
+
+    public abstract @Nullable T resolve(@NotNull SQLSource source, String data) throws Exception;
+
+    public @Nullable String serialize(@NotNull SQLSource source, Object value) throws Exception {
+        return String.valueOf(value);
+    }
+
+}

providers/sql/src/test/java/config/SQLConfigTest.java

@@ -1,27 +1,48 @@
 package config;
 
+import cc.carm.lib.configuration.demo.DatabaseConfiguration;
+import cc.carm.lib.configuration.demo.tests.ConfigurationTest;
+import cc.carm.lib.configuration.source.ConfigurationHolder;
+import cc.carm.lib.configuration.source.json.JSONConfigFactory;
+import cc.carm.lib.configuration.source.sql.SQLConfigFactory;
 import cc.carm.lib.easysql.EasySQL;
 import cc.carm.lib.easysql.api.SQLManager;
 import cc.carm.lib.easysql.beecp.BeeDataSourceConfig;
+import org.junit.Test;
+
+import java.io.File;
 
 public class SQLConfigTest {
 
+    boolean local = false;
 
+    @Test
     public void test() {
+        if (!local) return;
+
+        ConfigurationHolder<?> gsonHolder = JSONConfigFactory.from(new File("target/sql.json")).build();
+        gsonHolder.initialize(DatabaseConfiguration.class);
+
         BeeDataSourceConfig config = new BeeDataSourceConfig();
-        config.setDriverClassName("org.h2.Driver");
+        config.setDriverClassName(DatabaseConfiguration.DRIVER_NAME.resolve());
-        config.setJdbcUrl("jdbc:h2:file:target/test;DB_CLOSE_DELAY=-1;MODE=MySQL;");
+        config.setJdbcUrl(DatabaseConfiguration.buildJDBC());
+        config.setUsername(DatabaseConfiguration.USERNAME.resolve());
+        config.setPassword(DatabaseConfiguration.PASSWORD.resolve());
+
         SQLManager manager = EasySQL.createManager(config);
         manager.setDebugMode(true);
 
-//        SQLConfigProvider provider = EasyConfiguration.from(manager, "conf_test", "TESTING");
+        ConfigurationHolder<?> holder = SQLConfigFactory.from(manager)
-//
+                .tableName("test_configs")
-//        ConfigurationTest.testDemo(provider);
+                .namespace("testing")
-//        ConfigurationTest.testInner(provider);
+                .build();
-//
+
-//        ConfigurationTest.save(provider);
+        ConfigurationTest.testDemo(holder);
-//
+        ConfigurationTest.testInner(holder);
-//        EasySQL.shutdownManager(manager);
+
+        ConfigurationTest.save(holder);
+
+        EasySQL.shutdownManager(manager);
     }
 
 }

providers/yaml/pom.xml

@@ -6,7 +6,7 @@
     <parent>
         <artifactId>easyconfiguration-parent</artifactId>
         <groupId>cc.carm.lib</groupId>
-        <version>4.0.6</version>
+        <version>4.0.8</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <properties>
@@ -29,13 +29,6 @@
             <scope>compile</scope>
         </dependency>
 
-        <dependency>
-            <groupId>cc.carm.lib</groupId>
-            <artifactId>yamlcommentwriter</artifactId>
-            <version>1.2.0</version>
-            <scope>compile</scope>
-        </dependency>
-
         <dependency>
             <groupId>${project.parent.groupId}</groupId>
             <artifactId>easyconfiguration-feature-file</artifactId>

providers/yaml/src/main/java/cc/carm/lib/configuration/source/yaml/YAMLSource.java

@@ -56,7 +56,7 @@ public class YAMLSource
 
     @Override
     protected @NotNull YAMLSource self() {
-        return null;
+        return this;
     }
 
     @Override

providers/yaml/src/test/java/yaml/test/YamlTests.java

@@ -9,7 +9,6 @@ import org.junit.Test;
 
 import java.util.List;
 import java.util.Map;
-import java.util.regex.Pattern;
 
 public class YamlTests {