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先来看段mysql查询文章回复语句: 复制代码 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 ; #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,那是需要用动态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: 复制代码 代码如下: SET @ssra = CONCAT('SELECT * FROM gk_article WHERE id = ? LIMIT ?,?'); PREPARE sqlquery FROM @ssra; EXECUTE sqlquery USING @ra_id,@pagefrom,@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。 复制代码 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 ; #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 '='),解决方法: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: 复制代码 代码如下: UPDATE gk_permission SET `level` = @plevel, power = @ppower WHERE user_uid = CONVERT(@puser_uid USING utf8) COLLATE utf8_unicode_ci; 复制代码 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需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 ; 复制代码 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 ; 复制代码 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.*, un.`name`, se.`name`, jo.`name` FROM gk_user AS us, gk_unit AS un, gk_section AS se, 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 ; #技术点4:这个存数过程需要用到控制语句(if else elseif while loop repeat leave iterate)。 复制代码 代码如下: IF (getAdmin = 1) THEN #语句… END IF; #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),这个就是细心问题了,详细检查参数吧。 #技术点6:获取当前时间的函数:NOW() #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,一般是在定义字段时遇到关键字冲突的时候会用到。 |
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