MySql语法分析器

以下存储过程中存在错误语法错误：

DROP PROCEDURE IF EXISTS `SP_IncDecReferenceCount`;
CREATE DEFINER = `root`@`localhost` PROCEDURE `SP_IncDecReferenceCount`(pReferenceID int)
BEGIN
IF EXISTS(SELECT * from filesrefrences where filesrefrences.ReferenceID= pReferenceID and filesrefrences.RefrenceCount>1) then 
update filesrefrences
set 
    filesrefrences.RefrenceCount= filesrefrences.RefrenceCount-1
where 
        filesrefrences.ReferenceID= pReferenceID;
SELECT pReferenceID;
ELSE IF EXISTS(SELECT * from filesrefrences where filesrefrences.ReferenceID= pReferenceID) then 
DELETE from filesrefrences WHERE filesrefrences.ReferenceID = pReferenceID;
SELECT -77;
ELSE
SELECT -99;
end if ;
END;

错误是：

---

[Err]1064-您的SQL语法有错误；检查与MySQL服务器版本相对应的手册，以了解第8行中“”附近使用的正确语法您需要更改

分隔符。例如

DROP PROCEDURE IF EXISTS `SP_IncDecReferenceCount`;

DELIMITER &&

CREATE PROCEDURE `SP_IncDecReferenceCount`(pReferenceID int)
BEGIN
    IF EXISTS(SELECT * from filesrefrences where filesrefrences.ReferenceID= pReferenceID and filesrefrences.RefrenceCount>1) then 
        update filesrefrences
        set 
            filesrefrences.RefrenceCount= filesrefrences.RefrenceCount-1
        where 
                filesrefrences.ReferenceID= pReferenceID;
        SELECT pReferenceID;
    ELSE IF EXISTS(SELECT * from filesrefrences where filesrefrences.ReferenceID= pReferenceID) then 
        DELETE from filesrefrences WHERE filesrefrences.ReferenceID = pReferenceID;
        SELECT -77;
    ELSE
        SELECT -99;
    end if ;
END &&

DELIMITER ;

我删除了DEFINER=
root
@
localhost
，然后问题就解决了