《Mysql實例MySql學習心得之存儲過程》要點：
本文介紹了Mysql實例MySql學習心得之存儲過程，希望對您有用。如果有疑問，可以聯系我們。
MYSQL教程先來看段mysql查詢文章回復語句：
代碼如下:
#查詢文章回復
-- ----------------------------
-- 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#技術點1：MySql5.1不支持LIMIT參數(MySql5.5就支持了),如果編寫存儲過程時使用LIMIT做變量,那是必要用動態SQL來構建的,而這樣做性能肯定沒有靜態SQL好.主要代碼如下：
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;
#技術點2：如果同時需要返回受影響行數需要在語句后面添加語句：ROW_COUNT()函數,兩條語句之間需要“;”分隔.
代碼如下:
#更新數據
-- ----------------------------
-- 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#技術點3：MySQL進行字符串比較時發生錯誤(Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '='),解決辦法：將比較等式一邊進行字符串轉換,如改為“CONVERT(b.fullCode USING utf8) COLLATE utf8_unicode_ci”,主要代碼如下：
代碼如下:
???????? UPDATE gk_permission SET `level` = @plevel, power = @ppower WHERE user_uid = CONVERT(@puser_uid USING utf8) COLLATE utf8_unicode_ci;
代碼如下:
#插入數據
-- ----------------------------
-- 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必要在對應外鍵所在表有相應數據
???????? 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);
???????? #查詢結果會自動返回受影響行數
END
DELIMITER ;
代碼如下:
#根據ID刪除數據
-- ----------------------------
-- 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 ;
代碼如下:
#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 ;
MYSQL教程#技術點4：這個存數過程必要用到控制語句(if else elseif while loop repeat leave iterate).
代碼如下:
???????? IF (getAdmin = 1) THEN
?????????????????? #語句…
???????? END IF;
MYSQL教程#技術點5：在傳入參數不匹配的情況下報錯(Column count doesn't match value count at row 1),這個便是細心問題了,詳細檢查參數吧.
MYSQL教程#技術點6：獲取當前時間的函數：NOW()
MYSQL教程#技術點7：“`”這個符號是反單引號,兩個反單引號夾起來的會被當做變量,一般是在界說字段時遇到關鍵字沖突的時候會用到.
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