先來看段mysql查詢文章回複語句：
複製代碼 代碼如下:
#查詢文章回複
-- ----------------------------
-- 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 ;
#技術點1：MySql5.1不支援LIMIT參數（MySql5.5就支援了），如果編寫預存程序時使用LIMIT做變數，那是需要用動態SQL來構建的，而這樣做效能肯定沒有靜態SQL好。主要代碼如下：
複製代碼 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後面添加語句：ROW_COUNT()函數，兩條語句之間需要“;”分隔。
複製代碼 代碼如下:
#更新資料
-- ----------------------------
-- 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 ;
#技術點3：MySQL進行字串比較時發生錯誤（Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '='），解決方案：將比較等式一邊進行字串轉換，如改為“CONVERT(b.fullCode USING utf8) COLLATE utf8_unicode_ci”，主要代碼如下：
複製代碼 代碼如下:
UPDATE gk_permission SET `level` = @plevel, power = @ppower WHERE user_uid = CONVERT(@puser_uid USING utf8) COLLATE utf8_unicode_ci;
複製代碼 代碼如下:
#插入資料
-- ----------------------------
-- 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;
#由於外鍵約束，所以添加的外鍵欄位需要在對應外鍵所在表有相應資料
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 ;
複製代碼 代碼如下:
#根據ID刪除資料
-- ----------------------------
-- 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 ;
複製代碼 代碼如下:
#通過帳號查詢使用者或者管理員
-- ----------------------------
-- 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;
#查詢使用者
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 ;
#技術點4：這個存數過程需要用到控制語句（if else elseif while loop repeat leave iterate）。
複製代碼 代碼如下:
IF (getAdmin = 1) THEN
#語句…
END IF;
#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），這個就是細心問題了，詳細檢查參數吧。
#技術點6：擷取目前時間的函數：NOW()
#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數，一般是在定義欄位時遇到關鍵字衝突的時候會用到。
