java: MySQL Metadata

//https://www.baeldung.com/jdbc-database-metadata
    //https://docs.oracle.com/en/java/javase/11/docs/api/java.sql/java/sql/DatabaseMetaData.html

    /**
     * 获取某数据库中的表列表 涂聚文 Geovin Du geovindu
     * @param
     * @return  TablesMetadata集合
     * */
    public ArrayList<TablesMetadata> selectTablesMetadata()
    {
        ArrayList<TablesMetadata> list=new ArrayList<TablesMetadata>();
        TablesMetadata info=null;
        Connection connection=null;
        CallableStatement cstm =null;
        PreparedStatement pstmt = null;
        try {
            Class.forName(DRIVER_CLASS);
        }
        catch (ClassNotFoundException exception)
        {
            exception.printStackTrace();
        }
        try {
            connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
            // connection.getSchema();
            DatabaseMetaData databaseMetaData=connection.getMetaData();

            String productName = databaseMetaData.getDatabaseProductName();
            String productVersion = databaseMetaData.getDatabaseProductVersion();
            String driverName = databaseMetaData.getDriverName();
            String driverVersion = databaseMetaData.getDriverVersion();
            boolean supportsFullOuterJoins = databaseMetaData.supportsFullOuterJoins();
            boolean supportsStoredProcedures = databaseMetaData.supportsStoredProcedures();
            boolean supportsTransactions = databaseMetaData.supportsTransactions();
            boolean supportsBatchUpdates = databaseMetaData.supportsBatchUpdates();
            String userName = databaseMetaData.getUserName();
            /*
            　　  catalog 包含目录名称的 String。对此参数提供 Null 值表示无需使用目录名称。
　　              schema 包含架构名称模式的 String 值。对此参数提供 Null 值表示无需使用架构名称。
　　              tableNamePattern 包含表名称模式的 String。
　　              types 含有要包含的表类型的字符串数组。Null 表示应包含所有表类型。
            * */
            ResultSet resultSet = databaseMetaData.getTables(null, null, null, new String[]{"TABLE"});
            while(resultSet.next()) {
                info=new TablesMetadata();
                info.setTableName(resultSet.getString("TABLE_NAME"));
                info.setRemarks(resultSet.getString("REMARKS"));
                info.setTableSchem(resultSet.getString("TABLE_SCHEM"));
                info.setTableType(resultSet.getString("TABLE_TYPE"));
                list.add(info);
            }
            resultSet.close();
            resultSet=null;
            connection.close();

        }
        catch (SQLException sqlException)
        {
            sqlException.printStackTrace();

        }
        return  list;
    }
    /**
     * 返回某表的列属性列表  涂聚文 Geovin Du geovindu
     * @param TableName
     * @return  返回集合
     * */
    public ArrayList<ColumnsMetadata> selectColumnsMetadata(String TableName)
    {
        ArrayList<ColumnsMetadata> list=new ArrayList<ColumnsMetadata>();
        ColumnsMetadata info=null;
        Connection connection=null;
        CallableStatement cstm =null;
        PreparedStatement pstmt = null;
        try {
            Class.forName(DRIVER_CLASS);
        }
        catch (ClassNotFoundException exception)
        {
            exception.printStackTrace();
        }
        try {
            connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
            // connection.getSchema();
            DatabaseMetaData databaseMetaData=connection.getMetaData();
            ResultSet resultSet = databaseMetaData.getColumns(null,null, TableName, null);
            while(resultSet.next()) {
                info=new ColumnsMetadata();
                info.setColumnName(resultSet.getString("COLUMN_NAME"));
               // String columnName = resultSet.getString("COLUMN_NAME");

                info.setClumnSize(resultSet.getString("COLUMN_SIZE"));
                info.setDataType(resultSet.getString("DATA_TYPE"));
                info.setIsNullable(resultSet.getString("IS_NULLABLE"));
                info.setIsAutoincRement(resultSet.getString("IS_AUTOINCREMENT"));
                list.add(info);
            }
           // resultSet.close();
            resultSet=null;
           // connection.close();

        }
        catch (SQLException sqlException)
        {
            sqlException.printStackTrace();

        }
        return  list;
    }
    /**
     * 主键
     * @param TableName
     * @return
     *
     * */
    public ArrayList<ColumnsPrimaryKeys> selectColumnsPrimaryKeys(String TableName)
    {
        ArrayList<ColumnsPrimaryKeys> list=new ArrayList<ColumnsPrimaryKeys>();
        ColumnsPrimaryKeys info=null;
        Connection connection=null;
        CallableStatement cstm =null;
        PreparedStatement pstmt = null;
        try {
            Class.forName(DRIVER_CLASS);
        }
        catch (ClassNotFoundException exception)
        {
            exception.printStackTrace();
        }
        try {
            connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
            // connection.getSchema();
            DatabaseMetaData databaseMetaData=connection.getMetaData();
            ResultSet resultSet =  databaseMetaData.getPrimaryKeys(null, null, TableName);
            while(resultSet.next()) {
                info=new ColumnsPrimaryKeys();
                info.setColumnName(resultSet.getString("COLUMN_NAME"));
                info.setPkName(resultSet.getString("PK_NAME"));
                list.add(info);
            }
            resultSet.close();
            resultSet=null;
            connection.close();

        }
        catch (SQLException sqlException)
        {
            sqlException.printStackTrace();

        }
        return  list;
    }

    /**
     * 外键
     * @param TableName
     * @return
     *
     * */
    public ArrayList<ColumnsForeignKeys> selectColumnsForeignKeys(String TableName)
    {
        ArrayList<ColumnsForeignKeys> list=new ArrayList<ColumnsForeignKeys>();
        ColumnsForeignKeys info=null;
        Connection connection=null;
        CallableStatement cstm =null;
        PreparedStatement pstmt = null;
        try {
            Class.forName(DRIVER_CLASS);
        }
        catch (ClassNotFoundException exception)
        {
            exception.printStackTrace();
        }
        try {
            connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
            // connection.getSchema();
            DatabaseMetaData databaseMetaData=connection.getMetaData();
            ResultSet resultSet =  databaseMetaData.getImportedKeys(null, null, TableName);
            while(resultSet.next()) {
                info=new ColumnsForeignKeys();
                info.setPkTableName(resultSet.getString("PKTABLE_NAME"));
                info.setPkColumnName(resultSet.getString("PKCOLUMN_NAME"));
                info.setFkTableName(resultSet.getString("FKTABLE_NAME"));
                info.setFkColumnName(resultSet.getString("FKCOLUMN_NAME"));
                list.add(info);
            }
            resultSet.close();
            resultSet=null;
            connection.close();

        }
        catch (SQLException sqlException)
        {
            sqlException.printStackTrace();

        }
        return  list;
    }
    /**
     *
     *
     * */
    public ArrayList<SchemasMetadata> selectSchemasMetadata()
    {
        ArrayList<SchemasMetadata> list=new ArrayList<SchemasMetadata>();
        SchemasMetadata info=null;
        Connection connection=null;
        CallableStatement cstm =null;
        PreparedStatement pstmt = null;
        try {
            Class.forName(DRIVER_CLASS);
        }
        catch (ClassNotFoundException exception)
        {
            exception.printStackTrace();
        }
        try {
            connection = DriverManager.getConnection(URL, USERNAME, PASSWORD);
            // connection.getSchema();
            DatabaseMetaData databaseMetaData=connection.getMetaData();
            ResultSet resultSet = databaseMetaData.getSchemas();
            while (resultSet.next()){
                info=new SchemasMetadata();
                System.out.println("Schem:"+resultSet.getString("TABLE_SCHEM"));
                info.setTableSchem(resultSet.getString("TABLE_SCHEM"));
                info.setTableCatalog(resultSet.getString("TABLE_CATALOG"));
                list.add(info);
            }
           // resultSet.close();
            //resultSet=null;
            connection.close();

        }
        catch (SQLException sqlException)
        {
            sqlException.printStackTrace();

        }
        return  list;
    }