carm/EasySQL
carm/EasySQL
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chore(demo): 提供方便高效的metadata读取操作方法示例。

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close #59 , #60
This commit is contained in:
Carm Jos 2022-08-17 02:38:46 +08:00
parent 0230c77bb2
commit 5e41e21385
1 changed files with 20 additions and 0 deletions
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20
demo/src/main/java/EasySQLDemo.java
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@ -8,9 +8,11 @@ import cc.carm.lib.easysql.api.util.TimeDateUtils;
import cc.carm.lib.easysql.api.util.UUIDUtil;
import org.jetbrains.annotations.TestOnly;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
@TestOnly
@SuppressWarnings("all")
@ -157,4 +159,22 @@ public class EasySQLDemo {
}
}
public void metadata(SQLManager sql) {
// 操作数据库元数据，直接返回结果。
CompletableFuture<Boolean> roFuture = sql.fetchMetadata(DatabaseMetaData::isReadOnly);
CompletableFuture<Integer> maxColumnFuture = sql.fetchMetadata(DatabaseMetaData::getMaxColumnsInSelect);
// 操作有 ResultSet 元数据。该方法会自动关闭ResultSet。
CompletableFuture<Boolean> tableExists = sql.fetchMetadata(
meta -> meta.getTables(null, null, "表名", new String[]{"TABKE"}),
resultSet -> resultSet.next()
);
// SQLManager附带了几个常用元数据的获取方法。
CompletableFuture<Boolean> tableExists2 = sql.fetchTableMetadata("表名").validateExist();
CompletableFuture<Boolean> columnExists = sql.fetchTableMetadata("表名").isColumnExists("字段名");
}
}