在Java中获取数据库元数据的最简单方法？
我熟悉java.sql.DatabaseMetaData接口，但我觉得它很笨重。 例如，为了找出表名，您必须使用众所周知的文字作为列名来调用getTables并循环返回返回的ResultSet 。
有没有更简单的方法来获取数据库元数据？
使用DdlUtils很容易完成：
import javax.sql.DataSource; import org.apache.ddlutils.Platform; import org.apache.ddlutils.PlatformFactory; import org.apache.ddlutils.model.Database; import org.apache.ddlutils.platform.hsqldb.HsqlDbPlatform; public void readMetaData(final DataSource dataSource) { final Platform platform = PlatformFactory.createNewPlatformInstance(dataSource); final Database database = platform.readModelFromDatabase("someName"); // Inspect the database as required; has objects like Table/Column/etc. }
看一下SchemaCrawler（免费和开源），这是另一个为此目的而设计的API。 一些示例SchemaCrawler代码：
// Create the options final SchemaCrawlerOptions options = new SchemaCrawlerOptions(); // Set what details are required in the schema - this affects the // time taken to crawl the schema options.setSchemaInfoLevel(SchemaInfoLevel.standard()); options.setShowStoredProcedures(false); // Sorting options options.setAlphabeticalSortForTableColumns(true); // Get the schema definition // (the database connection is managed outside of this code snippet) final Database database = SchemaCrawlerUtility.getDatabase(connection, options); for (final Catalog catalog: database.getCatalogs()) { for (final Schema schema: catalog.getSchemas()) { System.out.println(schema); for (final Table table: schema.getTables()) { System.out.print("o--> " + table); if (table instanceof View) { System.out.println(" (VIEW)"); } else { System.out.println(); } for (final Column column: table.getColumns()) { System.out.println(" o--> " + column + " (" + column.getType() + ")"); } } } }