protected Map<String, Map<String, String>> getColumnComments(DatabaseConfig config) throws SQLException {
        return null;
    }
protected Map<String, Map<String, String>> getColumnComments(DatabaseConfig config) throws SQLException {
        return null;
    }
protected Map < String , Map < String , String > > getColumnComments ( DatabaseConfig config ) throws SQLException { return null ; }
获取表名和列名-注释映射

@param config
@return
@throws SQLException
获取表名和列名 - 注释映射