[數(shù)據(jù)庫]MySql存儲過程總結(jié)

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2014-06-12 01:00:50

之前總是在MSSQL上寫存儲過程，沒有在MYSQL上寫過，也基本沒有用過，今天需要用到MYSQL，研究了下，把項目的需要的存儲過程寫了一部分，寫一下工作總結(jié)。這里沒有給出數(shù)據(jù)庫結(jié)構(gòu)，不討論SQL語句的細(xì)節(jié)，主要探討存儲過程語法，適合有基礎(chǔ)的人。

發(fā)表地址：http://www.cnblogs.com/zxlovenet/p/3783136.html#查詢文章回復(fù)-- ------------------------------ 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 ;

#技術(shù)點1：MySql5.1不支持LIMIT參數(shù)(MySql5.5就支持了)，如果編寫存儲過程時使用LIMIT做變量，那是需要用動態(tài)SQL來構(gòu)建的，而這樣做性能肯定沒有靜態(tài)SQL好。主要代碼如下：

SET @ssra = CONCAT('SELECT * FROM gk_article WHERE id = ? LIMIT ?,?');

PREPARE sqlquery FROM @ssra;

EXECUTE sqlquery USING @ra_id,@pagefrom,@pagesize;

#技術(shù)點2：如果同時需要返回受影響行數(shù)需要在語句后面添加語句：ROW_COUNT()函數(shù)，兩條語句之間需要“;”分隔。

發(fā)表地址：http://www.cnblogs.com/zxlovenet/p/3783136.html#更新數(shù)據(jù)-- ------------------------------ 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 ;

#技術(shù)點3：MySQL進(jìn)行字符串比較時發(fā)生錯誤(Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=')，解決方法：將比較等式一邊進(jìn)行字符串轉(zhuǎn)換，如改為“CONVERT(b.fullCode USING utf8) COLLATE utf8_unicode_ci”，主要代碼如下：

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

#插入數(shù)據(jù)-- ------------------------------ 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; #由于外鍵約束，所以添加的外鍵字段需要在對應(yīng)外鍵所在表有相應(yīng)數(shù)據(jù) 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); #查詢結(jié)果會自動返回受影響行數(shù)END;;DELIMITER ;

發(fā)表地址：http://www.cnblogs.com/zxlovenet/p/3783136.html#根據(jù)ID刪除數(shù)據(jù)-- ------------------------------ 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 ;

#通過賬號查詢用戶或者管理員-- ------------------------------ 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; #查詢管理員 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; #查詢用戶 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 ;

#技術(shù)點4：這個存數(shù)過程需要用到控制語句(if else elseif while loop repeat leave iterate)。

IF (getAdmin = 1) THEN

#語句…

END IF;

發(fā)表地址：http://www.cnblogs.com/zxlovenet/p/3783136.html

#技術(shù)點5：在傳入?yún)?shù)不匹配的情況下報錯(Column count doesn't match value count at row 1)，這個就是細(xì)心問題了，詳細(xì)檢查參數(shù)吧。

#技術(shù)點6：獲取當(dāng)前時間的函數(shù)：NOW()

#技術(shù)點7：“`”這個符號是反單引號，兩個反單引號夾起來的會被當(dāng)做變量，一般是在定義字段時遇到關(guān)鍵字沖突的時候會用到。

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