前不久我隨便寫了專案中的乙個觸發器,裡面要用判斷select選取的值,不說了，直接上**delimiter //
create trigger update_sundriedbrick after insert on ry_information
for each row
begin
declare totalnumber int;
declare restnumber int;
declare createtime char(20);
declare flage int;
set flage =1;
set flage =(select count(*) from sundriedbrick where sb_createtime=createtime and b_idnumber = new.b_id);
set createtime = concat(extract(year_month from now()),extract(day from now())) ;
if flage=1 then
select sb_restnumber ,sb_totalnumber into restnumber, totalnumber from sundriedbrick where sb_createtime =createtime and b_idnumber = new.b_id;
set restnumber = restnumber+new.b_total;
set totalnumber = totalnumber+new.b_total;
update sundriedbrick set sb_restnumber = flage,sb_totalnumber =totalnumber where sb_createtime =createtime and b_idnumber = new.b_id;
else
insert into sundriedbrick values(concat("sb",createtime),new.b_id,new.b_name,createtime,'admin','wangxin',new.b_total,new.b_total,createtime) ;
#rollback;
end if;
end ;//
if (select count(*) from sundriedbrick where sb_createtime=createtime and b_idnumber = new.b_id)=1
然後就能正常執行,我從這推斷可能是這個多執行緒引起的,其他的因素我也沒有細細**
多執行緒讀寫mysql 多執行緒讀寫mysql資料庫
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c 多執行緒mysql 多執行緒讀寫mysql資料庫
該樓層疑似違規已被系統摺疊 隱藏此樓檢視此樓 unsigned int stdcall scan pvoid pm char ip 20 strcpy ip,char pm mysql mysql mysql res result 初始化mysql控制代碼 mysql init mysql 連線my...
c 多執行緒mysql 多執行緒讀寫mysql資料庫
該樓層疑似違規已被系統摺疊 隱藏此樓檢視此樓 unsigned int stdcall scan pvoid pm char ip 20 strcpy ip,char pm mysql mysql mysql res result 初始化mysql控制代碼 mysql init mysql 連線my...