Mysql实例MySql学习心得之存储过程

发布时间：2020-12-12 02:42:23 所属栏目：MySql教程来源：网络整理

导读：《Mysql实例MySql学习心得之存储过程》要点：本文介绍了Mysql实例MySql学习心得之存储过程，希望对您有用。如果有疑问，可以联系我们。 MYSQL教程先来看段mysql查询文章回复语句：代码如下: #查询文章回复 -- ---------------------------- -- Procedure

《Mysql实例MySql学习心得之存储过程》要点：
本文介绍了Mysql实例MySql学习心得之存储过程，希望对您有用。如果有疑问，可以联系我们。

MYSQL教程先来看段mysql查询文章回复语句：

代码如下:
#查询文章回复
-- ----------------------------
-- Procedure structure for `sp_select_reply_article`
-- ----------------------------
DROP PROCEDURE IF EXISTS `sp_select_reply_article`;
DELIMITER ;;
CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_select_reply_article`(IN `ra_id` int,IN `pagefrom` int,IN `pagesize` int)
BEGIN
???????? #Routine body goes here...
???????? SET @ra_id = ra_id;
???????? SET @pagefrom = pagefrom;
???????? SET @pagesize = pagesize;
???????? SET @ssra = CONCAT('SELECT * FROM gk_article WHERE id = ? LIMIT ?,?');
???????? PREPARE sqlquery FROM @ssra;
???????? EXECUTE sqlquery USING @ra_id,@pagefrom,@pagesize;
END

DELIMITER ;

MYSQL教程#技术点1：MySql5.1不支持LIMIT参数(MySql5.5就支持了),如果编写存储过程时使用LIMIT做变量,那是必要用动态SQL来构建的,而这样做性能肯定没有静态SQL好.主要代码如下：

代码如下:
???????? SET @ssra = CONCAT('SELECT * FROM gk_article WHERE id = ? LIMIT ?,@pagesize;

#技术点2：如果同时需要返回受影响行数需要在语句后面添加语句：ROW_COUNT()函数,两条语句之间需要“;”分隔. 代码如下:
#更新数据
-- ----------------------------
-- Procedure structure for `sp_update_permission`
-- ----------------------------
DROP PROCEDURE IF EXISTS `sp_update_permission`;
DELIMITER ;;
CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_update_permission`(IN `puser_uid` varchar(20),IN `plevel` int,IN `ppower` int)
BEGIN
???????? #Routine body goes here...

???????? SET @puser_uid = puser_uid;
???????? SET @plevel = plevel;
???????? SET @ppower = ppower;
???????? UPDATE gk_permission SET `level` = @plevel,power = @ppower WHERE user_uid = CONVERT(@puser_uid USING utf8) COLLATE utf8_unicode_ci;
END

DELIMITER ;

MYSQL教程#技术点3：MySQL进行字符串比较时发生错误(Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '='),解决办法：将比较等式一边进行字符串转换,如改为“CONVERT(b.fullCode USING utf8) COLLATE utf8_unicode_ci”,主要代码如下：

代码如下:
???????? UPDATE gk_permission SET `level` = @plevel,power = @ppower WHERE user_uid = CONVERT(@puser_uid USING utf8) COLLATE utf8_unicode_ci;
代码如下:
#插入数据
-- ----------------------------
-- Procedure structure for `sp_insert_user`
-- ----------------------------
DROP PROCEDURE IF EXISTS `sp_insert_user`;
DELIMITER ;;
CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_insert_user`(IN `uid` varchar(20),IN `upw` varchar(32),IN `name` varchar(20),IN `sex` int,IN `phone` varchar(20),IN `u_id` int,IN `s_id` int,IN `j_id` int)
BEGIN
???????? #Routine body goes here...
???????? SET @uid = uid;
???????? SET @upw = upw;
???????? SET @uname = uname;
???????? SET @sex = sex;
???????? SET @phone = phone;
???????? #由于外键约束,所以添加的外键字段必要在对应外键所在表有相应数据
???????? SET @u_id = u_id;
???????? SET @s_id = s_id;
???????? SET @j_id = j_id;
???????? SET @verifytime = DATE('0000-00-00');
???????? INSERT INTO gk_user(uid,upw,uname,sex,phone,u_id,s_id,j_id,verifytime)
　　　　　　　VALUES(@uid,@upw,@uname,@sex,@phone,@u_id,@s_id,@j_id,@verifytime);
???????? #查询结果会自动返回受影响行数
END

DELIMITER ;
代码如下:
#根据ID删除数据
-- ----------------------------
-- Procedure structure for `sp_delete_exchange_by_id`
-- ----------------------------
DROP PROCEDURE IF EXISTS `sp_delete_exchange_by_id`;
DELIMITER ;;
CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_delete_exchange_by_id`(IN `eid` int)
BEGIN
???????? #Routine body goes here...
???????? SET @eid = eid;
???????? DELETE FROM gk_exchange WHERE id = @eid;
END

DELIMITER ;
代码如下:
#通过账号查询用户或者管理员
-- ----------------------------
-- Procedure structure for `sp_select_user_by_uid`
-- ----------------------------
DROP PROCEDURE IF EXISTS `sp_select_user_by_uid`;
DELIMITER ;;
CREATE DEFINER=`root`@`localhost` PROCEDURE `sp_select_user_by_uid`(IN `uid` varchar(20),IN `getAdmin` int)
BEGIN
???????? #Routine body goes here...
???????? SET @uid = uid;
???????? #SET @getadmin = getAdmin;
???????? #查询管理员
???????? IF (getAdmin = 1) THEN
?????????????????? SELECT us.*,un.`name`,se.`name`,jo.`name`,pe.`level`,pe.power FROM gk_user AS us,gk_unit AS un,gk_section AS se,gk_jobtitle AS jo,gk_permission AS pe WHERE us.u_id = un.id AND us.s_id = se.id AND us.j_id = jo.id AND us.uid = pe.user_uid AND us.uid = CONVERT(@uid USING utf8) COLLATE utf8_unicode_ci;
???????? END IF;
???????? #查询用户
???????? IF (getAdmin = 0) THEN
?????????????????? SELECT us.*,jo.`name` FROM gk_user AS us,gk_jobtitle AS jo WHERE us.u_id = un.id AND us.s_id = se.id AND us.j_id = jo.id AND us.uid = CONVERT(@uid USING utf8) COLLATE utf8_unicode_ci;
???????? END IF;
END

DELIMITER ;

MYSQL教程#技术点4：这个存数过程必要用到控制语句(if else elseif while loop repeat leave iterate).

代码如下:
???????? IF (getAdmin = 1) THEN
?????????????????? #语句…
???????? END IF;

MYSQL教程#技术点5：在传入参数不匹配的情况下报错(Column count doesn't match value count at row 1),这个便是细心问题了,详细检查参数吧.

MYSQL教程#技术点6：获取当前时间的函数：NOW()

MYSQL教程#技术点7：“`”这个符号是反单引号,两个反单引号夹起来的会被当做变量,一般是在界说字段时遇到关键字冲突的时候会用到.

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