查詢數據庫表名，數據表信息，MySQL Key值（PRI, UNI, MUL）的含義

數據表名：

　　SELECT TABLE_NAME FROM information_schema.`TABLES` WHERE TABLE_SCHEMA ='v53' AND TABLE_TYPE ='BASE TABLE'

數據表信息：

　　SELECT COLUMN_NAME ,IS_NULLABLE ,COLUMN_TYPE,COLUMN_KEY FROM information_schema.`COLUMNS` WHERE TABLE_SCHEMA ='v53' AND TABLE_NAME ='bi_user_info';

MySQL Key值（PRI, UNI, MUL）的含義：

　　PRI主鍵約束　　UNI唯一約束　　MUL可以重復