table.sql=select table_schema, table_name, table_comment from information_schema.tables where table_schema = DATABASE();
column.sql=select column_name, column_comment, data_type, locate('auto_increment', extra) > 0 as auto_increment, case when column_key = 'PRI' then '1' else '0' end as `primary` from information_schema.columns where table_schema = ? and table_name = ?