1、要查询数据库 "mammothcode" 下所有表名以及表注释

/*查询数据库 ‘mammothcode’ 所有表注释*/SELECT TABLE_NAME,TABLE_COMMENT FROM information_schema.TABLES WHERE table_schema='mammothcode';

2、要查询表字段的注释

/*查询数据库 ‘mammothcode’ 下表 ‘t_adminuser’ 所有字段注释*/SELECT COLUMN_NAME,column_comment FROM INFORMATION_SCHEMA.Columns WHERE table_name='t_adminuser' AND table_schema='mammothcode'

3、一次性查询数据库 "mammothcode" 下表注释以及对应表字段注释

SELECT t.TABLE_NAME,t.TABLE_COMMENT,c.COLUMN_NAME,c.COLUMN_TYPE,c.COLUMN_COMMENT

FROM information_schema.TABLES t,INFORMATION_SCHEMA.Columns c

WHERE c.TABLE_NAME=t.TABLE_NAME AND t.`TABLE_SCHEMA`='mammothcode'

扩展：使用存储过程，对上面sql语句进行存储，SQL 如下：

DELIMITER//

DROP PROCEDURE IF EXISTS findComment//CREATE PROCEDURE findComment (dbName VARCHAR(50))

BEGIN

DECLARE stmt VARCHAR(65535);

#如果用户名长度大于0

IF LENGTH(dbName)>0THEN

BEGIN

SET @sqlstr=CONCAT('SELECT t.TABLE_NAME,t.TABLE_COMMENT,c.COLUMN_NAME,c.COLUMN_TYPE,c.COLUMN_COMMENT FROM information_schema.TABLES t,INFORMATION_SCHEMA.Columns c WHERE c.TABLE_NAME=t.TABLE_NAME AND t.`TABLE_SCHEMA`=','''',dbName,'''');

END;

ELSE

BEGIN

SET @sqlstr=CONCAT('SELECT ','''','数据库名不能为空','''', 'AS ','''','提示','''');

END;

END IF;

PREPARE stmt FROM @sqlstr;

EXECUTE stmt;

END//DELIMITER ;

调用存储过程：

CALL findComment('xiyinli_test');

上面的存储过程还可以简化：在存储过程中直接查询当前使用的数据库，如下：

DELIMITER//

DROP PROCEDURE IF EXISTS findComment//CREATE PROCEDURE findComment ()

BEGIN

DECLARE stmt VARCHAR(65535);

#查询当前的 use-->database

SET @dbName=(SELECT DATABASE());

BEGIN

SET @sqlstr=CONCAT('SELECT t.TABLE_NAME,t.TABLE_COMMENT,c.COLUMN_NAME,c.COLUMN_TYPE,c.COLUMN_COMMENT FROM information_schema.TABLES t,INFORMATION_SCHEMA.Columns c WHERE c.TABLE_NAME=t.TABLE_NAME AND t.`TABLE_SCHEMA`=','''',@dbName,'''');

END;

PREPARE stmt FROM @sqlstr;

EXECUTE stmt;

END//DELIMITER ;

调用：

CALL findComment();

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