MySql IN踩過的坑

private dynamicparameters getparameters()

else
if (!string.isnullorempty(request.productname))
%", request.productname));
}else
if (request.fk_startcitys != null && request.fk_startcitys.any())
else
if (request.fk_areas != null && request.fk_areas.any())
else
if (request.fk_destinationplays != null && request.fk_destinationplays.any())
else
if (request.ranks != null && request.ranks.any())
else
datetime startdate;
if (!string.isnullorempty(request.startdateb) && datetime.tryparse(request.startdateb, out startdate))
else
datetime enddate;
if (!string.isnullorempty(request.startdatee) && datetime.tryparse(request.startdatee, out enddate))
else
return parameters;
}private string getwhereext()
) ", string.join(",", request.fk_destinationplays));
}return whereext;
}

select count(1) from

(select p.id
from product p
left join productext pext on pext.fk_product=p.id
left join rank r on r.id = pext.fk_rank
left join productsalescity sc on sc.fk_product=p.id and sc.isvalid='t'
inner join tour t on t.fk_product=p.id and t.isvalid='t' and t.isshowh5='t' and t.canbooking='t'
and t.expiredate>=now() and t.deadlinedate>= now() and t.`status`=2 and ifnull(t.islock,'f')<>'t'
left join tourminpriceinventory tmpi on tmpi.fk_tour=t.id
where p.isvalid='t' and p.category in (1,2,3)
and p.id=ifnull(@id,p.id)
and p.name like ifnull(@name,p.name)
and ifnull(pext.fk_destinationplay,0) in (ifnull(@fk_destinationplays,ifnull(pext.fk_destinationplay,0)))
and ifnull(pext.fk_rank,0) in (ifnull(@rank,ifnull(pext.fk_rank,0)))
and ifnull(sc.fk_city,0) in (ifnull(@fk_startcitys,ifnull(sc.fk_city,0)))
and ifnull(p.fk_area,0) in (ifnull(@fk_areas,ifnull(p.fk_area,0)))
and t.startdate >= ifnull(@startdateb,t.startdate)
and t.startdate <= ifnull(@startdatee,t.startdate)
#group by p.id
) as a;

其他變數均為null；

當採用寫法：and ifnull(pext.fk_destinationplay,0) in (ifnull(@fk_destinationplays,ifnull(pext.fk_destinationplay,0)))

時，會自動將變數值新增引號，造成僅匹配到fk_destinationplay為194的資料，造成sql查詢結果不準確；正確寫法為呼叫方法getwhereext，即：

and pext.fk_destinationplay in (194,195,196,197,198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,216,217,218,306,307,308,309,349,377)

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