MySQL

Question

CREATE PROCEDURE `usp_GetUserValidation`

(IN `@Username` VARCHAR(255), 
 IN `@Password` VARCHAR(50), 
 OUT `@ErrorCode` INT)

    LANGUAGE SQL
    NOT DETERMINISTIC
    CONTAINS SQL
    SQL SECURITY DEFINER
    COMMENT 'To validate user login'
BEGIN

    IF EXISTS
    (SELECT UserID 
        FROM mt_User
        WHERE Username = `@Username`
        AND Password = PASSWORD(`@Password`))

        BEGIN
            SET `@ErrorCode` = 0;
        END

    ELSE
        SET `@ErrorCode` = 1;


    SELECT '@ErrorCode' AS res
END

大家好。我是 SQL 服务器用户。最近刚开始学习MySQL及其存储过程（例程）的编写。任何人都可以指出导致以下错误的错误是什么？提前谢谢你们:)

1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use

near 'BEGIN SET @ErrorCode = 0' at line 15

Answer 1

这可能就是您想要的。 DELIMITER BLOCK 中的整个内容，以及对 IF 块的一些更改（有一些语法错误）。请注意，它现在保存在我的系统上。

DELIMITER $$
CREATE PROCEDURE `usp_GetUserValidation`

(IN `@Username` VARCHAR(255), 
 IN `@Password` VARCHAR(50), 
 OUT `@ErrorCode` INT)

    LANGUAGE SQL
    NOT DETERMINISTIC
    CONTAINS SQL
    SQL SECURITY DEFINER
    COMMENT 'To validate user login'
BEGIN

    IF EXISTS
    (SELECT UserID 
        FROM mt_User
        WHERE Username = `@Username`
        AND Password = PASSWORD(`@Password`)) THEN

            SET `@ErrorCode` = 0;

    ELSE
        SET `@ErrorCode` = 1;
    END IF;


    SELECT '@ErrorCode' AS res;
END$$
DELIMITER ;

MySQL - 存储过程语法问题

MySQL - Stored Procedures syntax issue

stored-procedures

mysql-routines

1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use