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MySql學(xué)習(xí)心得之存儲(chǔ)過程
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之前總是在MSSQL上寫存儲(chǔ)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(xiàng)目的需要的存儲(chǔ)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(chǔ)過程語法,適合有基礎(chǔ)的人。

先來看段mysql查詢文章回復(fù)語句:

#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(diǎn)1:MySql5.1不支持LIMIT參數(shù)(MySql5.5就支持了),如果編寫存儲(chǔ)過程時(shí)使用LIMIT做變量,那是需要用動(dòng)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(diǎn)2:如果同時(shí)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。
#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(diǎn)3:MySQL進(jìn)行字符串比較時(shí)發(fā)生錯(cuò)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(duì)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(huì)自動(dòng)返回受影響行數(shù)
END

DELIMITER ;
#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(hào)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(diǎn)4:這個(gè)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;
 

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

#技術(shù)點(diǎn)6:獲取當(dāng)前時(shí)間的函數(shù):NOW()

#技術(shù)點(diǎn)7:“`”這個(gè)符號(hào)是反單引號(hào),兩個(gè)反單引號(hào)夾起來的會(huì)被當(dāng)做變量,一般是在定義字段時(shí)遇到關(guān)鍵字沖突的時(shí)候會(huì)用到。



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