MySql learning experience stored procedure
- 2020-06-19 11:50:50
- OfStack
First look at paragraph mysql query article reply statement:
# Query article reply
-- ----------------------------
-- 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 ;
# Technicalpoint 1: MySql5.1 does not support LIMIT parameters (MySql5.5 does). If you write stored procedures using LIMIT as a variable, you will need to build them with dynamic SQL, which is certainly not as good as static SQL. The main codes are as follows:
SET @ssra = CONCAT('SELECT * FROM gk_article WHERE id = ? LIMIT ?,?');
PREPARE sqlquery FROM @ssra;
EXECUTE sqlquery USING @ra_id,@pagefrom,@pagesize;
# technicpoint 2: If you also want to return the number of rows affected add the statement: ROW_COUNT() function, "; "between the two statements. Space.
# Update the data
-- ----------------------------
-- 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 ;
Error (Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=') Convert the comparison equation 1 to CONVERT(ES42en.fullCode USING utf8) COLLATE utf8_unicode_ci). The main code is as follows:
UPDATE gk_permission SET `level` = @plevel, power = @ppower WHERE user_uid = CONVERT(@puser_uid USING utf8) COLLATE utf8_unicode_ci;
# Insert data
-- ----------------------------
-- 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;
# Because of foreign key constraints, the added foreign key fields need to have data in the table where the corresponding foreign key resides
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);
# The query results automatically return the number of rows affected
END
DELIMITER ;
# According to the ID Delete the data
-- ----------------------------
-- 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 ;
# Query the user or administrator by account
-- ----------------------------
-- 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;
# Query manager
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;
# Query the user
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 ;
# technicpoint 4: This counting process requires a control statement (if else elseif loop repeat leave iterate).
IF (getAdmin = 1) THEN
# The statement...
END IF;
# Technical point 5: error (Column count doesn't match value count at row 1) in the case of passing in mismatched parameters.
# Technicpoint 6: Function to get the current time: NOW()
The symbol "'" is an inverted comma. Two inverted commas are used as variables. 1.