MySQL - 您的 SQL 语法有错误；检查与您的 MariaDB 服务器版本相对应的手册以获取正确的语法 - phpMyAdmin

Question

我在 PhpMyAdmin 的存储过程下面运行：

DELIMITER //

CREATE PROCEDURE usp_ForgotPassword (
    -- Add the parameters for the stored procedure here
    p_mobileNo VARCHAR(50),
    p_emailId VARCHAR(300),
    p_password VARCHAR(300),
    p_otp VARCHAR(50),
    p_appInstanceCode CHAR(36))
BEGIN   
    DECLARE v_IsOTPValid TINYINT DEFAULT  NULL;
    SET v_IsOTPValid = NULL;
    DECLARE v_userCode CHAR(36);

    IF (v_IsOTPValid = 1)
    THEN
        IF EXISTS(SELECT * FROM OTP WHERE otp = p_otp AND mobileNo = p_mobileNo)
        THEN

            SET v_userCode = (SELECT userCode FROM UserLogin WHERE userName = p_emailId);

            UPDATE UserLogin UL
            SET password = p_password 
            WHERE userName = p_emailId AND userCode = v_userCode;

            -- Delete the verified OTP 
            DELETE FROM OTP WHERE otp = p_otp AND mobileNo = p_mobileNo;

            DECLARE v_Token CHAR(36);


            INSERT INTO Token (createdAt, updatedAt,code,userCode,appInstanceCode,deviceIMEI,deviceName)
                                VALUES (NOW(),NOW(),v_Token,v_userCode,p_appInstanceCode,NULL,NULL);


            SELECT 200 code, 'Password changed succesfully' as message,v_Token;
        ELSE
            SELECT 400 as code, 'Invalid OTP or Mobile No' as message,v_Token;
        END IF;
    ELSE
        SELECT 401 as code, 'OTP expired' as message,v_Token;
    END IF; 
END
//
delimiter ;

但它一直显示错误：

1064 - 您的 SQL 语法有错误；检查与您的 MariaDB 服务器版本相对应的手册，以了解在 'DECLARE v_IsOTPValid TINYINT DEFAULT NULL; 附近使用的正确语法； 设置 v_IsOTPValid = NULL； DECL' 在第 9 行

我试过了：

Is declare in mysql giving syntax error?

和

Mystery error in CREATE PROCEDURE in MariaDB/MySQL

但是这些答案都没有帮助！

Answer 1

在所有 DECLARE 语句结束之前都有一个 SET..

根据official documentation，将所有声明放在集合或任何其他语句之前：

BEGIN   
  DECLARE v_IsOTPValid TINYINT DEFAULT  NULL;
  DECLARE v_userCode CHAR(36);
  DECLARE v_Token CHAR(36); 
  SET v_IsOTPValid = NULL;