在MySQL数据库中,存储过程(Stored Procedure)是一组为了完成特定任务而预先编译好的SQL语句集合。通过存储过程,可以提高数据库的性能和安全性,同时减少重复编写相同SQL语句的工作量。IF ELSE语句是编写存储过程时经常用到的逻辑控制语句,可以根据条件执行不同的SQL语句块。 IF ELSE语句的语法 IF ELSE语句的基本语法如下...
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在MySQL中,IF和ELSE语句通常用于条件判断,它们可以在存储过程、函数或触发器中使用。以下是IF和ELSE语句的基本格式: 代码语言:txt 复制 IF condition THEN -- 当条件为真时执行的SQL语句 ELSE -- 当条件为假时执行的SQL语句 END IF; 其中,condition是一个返回布尔值的表达式。如果condition为真(即非零和非NULL)...
ELSE # i.e. not equal Europe INSERT INTO customer_orders (user_id, item_id, brand, model, color, price_us, quantity) SELECT user_id, item_id, brand, model, color, price_us, quantity FROM shopping_cart WHERE user_id = in_user_id ...
以下是一个MySQL存储过程的示例,模拟if循环逻辑: 代码语言:txt 复制 DELIMITER // CREATE PROCEDURE ProcessData(IN input INT) BEGIN DECLARE result VARCHAR(255); IF input > 0 THEN SET result = 'Positive'; ELSEIF input < 0 THEN SET result = 'Negative'; ELSE SET result = 'Zero'; END IF; SE...
Bug #8762 Stored Procedures: Inconsistent behavior of DROP PROCEDURE IF EXISTS statement. Submitted: 24 Feb 2005 0:32Modified: 3 Mar 2005 10:38 Reporter: Disha Email Updates: Status: Closed Impact on me: None Category: MySQL ServerSeverity: S3 (Non-critical) Version: 5.0.2OS: Linux (...
elseif ipmode='保护' then delete from IpProtectedInfo where Ip=reip; DELETE from IpProtectedMacList where Ip=reip and Mac=remac; update AllResourceIpInfo set State=1 where IpValue=funGetIPValue(reip) and State=3; elseif ipmode='绑定' THEN ...
Description:A stored procedure crashes if it contains SELECT ... INTO p1,p1 ... Notice the duplication of p1. If it contains SELECT ... INTO p1,p2 ... there's no problem.How to repeat:mysql> create table t70 (s1 int,s2 int); Query OK, 0 rows affected (0.00 sec) mysql> insert...
If no expression evaluates to TRUE, the else-statements in the ELSE branch will execute. MySQL IF statement examples# The following example illustrates how to use the IF-ESLEIF-ELSE statement. The GetCustomerLevel() stored procedure accepts two parameters customer number and customer level. First...
ELSE INSERT INTO customer_orders (user_id, item_id, brand, model, color, price_us, quantity) SELECT user_id, item_id, brand, model, color, price_us, quantity FROM shopping_cart WHERE user_id = in_user_id AND buy_now = 'yes'; ...