我儲存過程裡想實現多個傳入引數的判斷,裡面有7個傳入引數條件.
create procedure sp_tbwastesource_search
(@sd datetime, //開始日期
@ed datetime, //結束日期
@con1 varchar(50),
@con2 varchar(30),
@con3 varchar(5),
@con4 varchar(10),
@con5 varchar(4) )as
declare @sql varchar(1000)
begin
set @sql='select * from table '
if @sd!='' and @ed!=''
begin
set @sql=@sql+' where cosid= '+cast(@cosid as varchar)
endif (@cosname!= '' and @cosid!='')
begin
set @sql=@sql+'and'+' cosname= '+cast (@cosname as varchar )
endelse
if (@cosname!='' and @cosid ='')
begin
set @sql=@sql+'where '+' cosname= '+cast (@cosname as varchar )
endif @coscredit!= '' and (@cosid!='' or @cosname!='')
begin
set @sql=@sql+' and coscredit= '+cast (@coscredit as varchar )
endelse
if @coscredit!='' and @cosid=''and @cosname=''
set @sql=@sql+'where coscredit= '+cast (@coscredit as varchar )
exec (@sql)
endgo
無論是ado.net還是儲存過程的組合查詢的sql語句編寫方式:select * from temp where (@serverid='' or serverid=@serverid) and (@sname='' or sname=@sname)
sqlparameter param=new sqlparameter("@serverid",serverid==-1?string.empty:serverid.tostring());//這裡的serverid傳遞過來是int型別,如果為-1,那麼查詢全部,傳遞空串即可,否則傳遞serverid,資料庫會自動將@serverid的值轉換為int
sqlparameter param=new sqlparameter("@sname",sname); //字串直接傳引數即可，因為可以為空串string.empty
以下為參考:
create procedure sp_tbwastesource_search
(@sd datetime=null, //開始日期
@ed datetime=null, //結束日期
@con1 varchar(50),
@con2 varchar(30),
@con3 varchar(5),
@con4 varchar(10),
@con5 varchar(4)
)as
begin
select * from tb
where (@sd is null or date>@sd) and (@ed is null or date<@ed)
endselect * from table_name
where ((@sd is null and @ed is null) or (sd >= @sd and ed <= @ed)) --sd和ed都是空時,此條件總為true,否則相當於sd >= @sd and ed <= @ed
and (@con1 is null or con1 = @con1) --如果@con1不傳值,則此行條件總為true;如果傳值,則此行為and con1=@con1
and (@con2 is null or con2 = @con2) --同con1
and (@con3 is null or con3 = @con3) --同con1
and (@con4 is null or con4 = @con4) --同con1
and (@con5 is null or con5 = @con5) --同con1
select * from table
where 1=1
and sd>= case when @sd is not null when @sd else sd end
and ed<= case when @ed is not null when @ed else ed end
and cosid= case when @cosid is not null when @cosid else cosid end
and cosname= case when @cosname is not null when @cosname else cosname end
and .....
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