Question

我尝试在mysql中创建一个过程，但是我得到一个语法错误，我不知道为什么我得到它以及''

# 1064 - You have an error in the RSQL syntax next to '' on line 4

我的程序：

CREATE PROCEDURE MUWAP_VipAdd(IN szCharName varchar(10),IN DayAdd int,IN VipType smallint,IN datenow_srv datetime)
BEGIN
IF NOT EXISTS (SELECT 1 FROM `T_VIPList` WHERE AccountID = szCharName) THEN
INSERT INTO `T_VIPList` (`AccountID`,`Date`,`Type`) VALUES (szCharName,DATE_ADD(datenow_srv, INTERVAL DayAdd DAY),VipType);
ELSE IF EXISTS (SELECT 1 FROM `T_VIPList`  WHERE AccountID = szCharName AND Date > datenow_srv) THEN
UPDATE `T_VIPList` SET `Date` = DATE_ADD(`Date`,INTERVAL DayAdd DAY) WHERE `AccountID` = szCharName;
UPDATE `T_VIPList` SET `Type` = VipType WHERE `AccountID` = szCharName AND `Type` < VipType;
ELSE 
UPDATE `T_VIPList` SET `Date` = DATE_ADD(`Date`,INTERVAL DayAdd DAY), `Type` = VipType WHERE `AccountID` = szCharName;
END IF
END

谢谢！

Answer 1

要在THEN语句中包含多个语句，您需要使用BEGIN...END。

CREATE PROCEDURE MUWAP_VipAdd(IN szCharName varchar(10),IN DayAdd int,IN VipType smallint,IN datenow_srv datetime)
BEGIN
    IF NOT EXISTS (SELECT 1 FROM `T_VIPList` WHERE AccountID = szCharName) 
    THEN INSERT INTO `T_VIPList` (`AccountID`,`Date`,`Type`) VALUES (szCharName,DATE_ADD(datenow_srv, INTERVAL DayAdd DAY),VipType);
    ELSE IF EXISTS (SELECT 1 FROM `T_VIPList`  WHERE AccountID = szCharName AND Date > datenow_srv) 
    THEN BEGIN
        UPDATE `T_VIPList` SET `Date` = DATE_ADD(`Date`,INTERVAL DayAdd DAY) WHERE `AccountID` = szCharName;
        UPDATE `T_VIPList` SET `Type` = VipType WHERE `AccountID` = szCharName AND `Type` < VipType;
    END
    ELSE UPDATE `T_VIPList` SET `Date` = DATE_ADD(`Date`,INTERVAL DayAdd DAY), `Type` = VipType WHERE `AccountID` = szCharName;
    END IF
END

您还可以将两个UPDATE查询合并到一个查询中：

UPDATE T_VIPList
SET Date = DATE_ADD(Date, INTERVAL DayAdd DAY),
    Type = GREATEST(VipType, Type)
WHERE AccountID = szCharName;

事实上，似乎可以使用单个INSERT ... ON DUPLICATE KEY UPDATE查询来完成整个事情：

INSERT INTO T_VIPList (AccountID, Date, Type)
VALUES (szCharName,DATE_ADD(datenow_srv, INTERVAL DayAdd DAY),VipType)
ON DUPLICATE KEY UPDATE
    Date = IF(Date > datenow_srv, VALUES(Date), Date),
    Type = GREATEST(Type, VALUES(Type));

Mysql过程IF，ELSEIF Statment错误

1 个答案: