MySQL錯誤，儲存過程死迴圈錯誤

寫乙個儲存過程，結果老報錯，提示說是死迴圈錯誤，

call core_getparentjob(10,1,@a)    error code: 1456.

recursive limit 0 (as set by the max_sp_recursion_depth variable) was exceeded for routine core_getparentjob

怎麼檢查也不知道**出了問題。

不過執行這條語句，set @@session.max_sp_recursion_depth=25; 設定迴圈深度，至少不報錯。

儲存過程

delimiter $$

create definer=`root`@`localhost` procedure `core_getparentjob`(in jobid int, in xtype int, out tempjobid int)
begin
declare parentjobid int;
declare tt int;
declare tc int;
set parentjobid = 0;
-- get the parent job id
select parentid into parentjobid from core_job ta where ta.id_ = jobid;
-- get the manager
if xtype = 1 then
set tc = 0;
select count(*) into tc from core_job ta where ta.id_ = parentjobid and ta.ismanager = 1;
if tc = 0 and parentjobid > 0 then
call core_getparentjob(parentjobid,1, tt);
set parentjobid = tt;
end if;
end if;
set tempjobid = parentjobid;
select parentjobid;
end

mysql官方文件指出 函式無法用遞迴呼叫

儲存過程可以用遞迴呼叫。但是，預設情況下，是禁用的。

要開啟遞迴呼叫，需要把引數max_sp_recursion_depth設定成非零值。

還有其他一些引數需要調整。

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