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...
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)...
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DELIMITER // CREATE PROCEDURE CheckCondition(IN input INT) BEGIN IF input > 0 THEN SELECT 'Positive'; ELSE SELECT 'Non-positive'; END IF; END // DELIMITER ; 然后,在C#中调用这个存储过程: 代码语言:txt 复制 using MySql.Data.MySqlClient; using System; class Program { static void Main() {...
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'; ...
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...
Status:ClosedImpact on me: None Category:Connector / JSeverity:S2 (Serious) Version:OS:Any Assigned to:Filipe SilvaCPU Architecture:Any [29 Aug 2014 17:54] Filipe Silva Description:If a stored procedure, with OUT or INOUT params, and a function with the same name exists, when registering ...
Bug #2329 Crash if insert with variable name in stored procedure Submitted: 8 Jan 2004 17:16Modified: 14 Jan 2004 3:55 Reporter: Peter Gulutzan Email Updates: Status: Closed Impact on me: None Category: MySQL ServerSeverity: S3 (Non-critical) Version: 5.0.0-alpha-debugOS: 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 ...
CREATE DEFINER=`root`@`localhost` PROCEDURE `spAddNewCountry`(IN countryTag TEXT, IN countryName TEXT, IN langTag TEXT) BEGIN DECLARE countryId INT; SET countryId = -1; SELECT Country_Id INTO countryId FROM tbl_country WHERE Country_Tag = countryTag; IF (countryId = -1) THEN ...