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commit
5e41e21385
@ -8,9 +8,11 @@ import cc.carm.lib.easysql.api.util.TimeDateUtils;
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import cc.carm.lib.easysql.api.util.UUIDUtil;
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import org.jetbrains.annotations.TestOnly;
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import java.sql.DatabaseMetaData;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.util.UUID;
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import java.util.concurrent.CompletableFuture;
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@TestOnly
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@SuppressWarnings("all")
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@ -157,4 +159,22 @@ public class EasySQLDemo {
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}
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}
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public void metadata(SQLManager sql) {
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// 操作数据库元数据,直接返回结果。
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CompletableFuture<Boolean> roFuture = sql.fetchMetadata(DatabaseMetaData::isReadOnly);
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CompletableFuture<Integer> maxColumnFuture = sql.fetchMetadata(DatabaseMetaData::getMaxColumnsInSelect);
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// 操作有 ResultSet 元数据。该方法会自动关闭ResultSet。
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CompletableFuture<Boolean> tableExists = sql.fetchMetadata(
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meta -> meta.getTables(null, null, "表名", new String[]{"TABKE"}),
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resultSet -> resultSet.next()
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);
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// SQLManager附带了几个常用元数据的获取方法。
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CompletableFuture<Boolean> tableExists2 = sql.fetchTableMetadata("表名").validateExist();
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CompletableFuture<Boolean> columnExists = sql.fetchTableMetadata("表名").isColumnExists("字段名");
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}
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}
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