MySQL存储过程语法错误

Question

我尝试为我的存储过程执行以下代码，它在第 14 行抛出错误。我无法找到错误所在，请帮助我解决。

DELIMITER $$
   CREATE PROCEDURE usp_SetGems (
    -- Add the parameters for the stored procedure here
    p_requestid int/* =null */,
    p_akcija int/* =null */)
 BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.

    -- Insert statements for procedure here
    if p_akcija = 0 then

    declare @v_userId char(36);
    declare @v_vingems int;

    select @v_userId:=r.user_id, @v_vingems := r.value from Requests r
    where r.Id=p_requestid; 

    update Users 
    set balance=balance+@v_vingems
    where id=v_userId;

    else

    declare @v_userrId longtext;
    declare @v_vingemss int;

    select @v_userrId.user_id:=r.user_id, @v_vingemss := r.value from Requests r
    where r.Id=p_requestid;

    update Users 
    set balance=balance-@v_vingems
    where id=v_userrId;
    end if;
 end;  $$    
 DELIMITER ;

Answer 1

您的 Declare 语句是错误的(declare @v_userId char(36),declare @v_vingems int; .....)。以下是您的程序的正确代码:-

DELIMITER $$
   CREATE PROCEDURE usp_SetGems (
    -- Add the parameters for the stored procedure here
    p_requestid int/* =null */,
    p_akcija int/* =null */)
    BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.

    -- Insert statements for procedure here
    if p_akcija = 0 then
        BEGIN 
            select r.user_id, r.value INTO @v_userId, @v_vingems from Requests r
            where r.Id=p_requestid; 
            update Users 
            set balance=balance+@v_vingems
            where id=v_userId;
        END;
    else
        BEGIN 
            select r.user_id, r.value INTO @v_userId, @v_vingems from Requests r
            where r.Id=p_requestid; 

            update Users 
            set balance=balance-@v_vingems
            where id=v_userrId;
        END;
    end if;
 end $$ 
 DELIMITER ;