合併查詢返回值

Question

我在存儲過程中使用合併查詢。我想在插入時被返回一個標誌。即當PK不匹配時。

CREATE PROCEDURE [dbo].[IUD_QtrMinute] 

    @qtrminlat varchar(5), 
    @qtrminlng varchar(6), 
    @callCenter varchar(20), 
    @areaId int 

AS 
BEGIN 
    merge [dbo].[map_qtrmin] as target 
    using (values(@qtrminlat, @qtrminlng, @areaId, @callCenter)) 
     as source ([qtrmin_lat], [qtrmin_long], [area_id], [call_center]) 
     on (target.qtrmin_lat = @qtrminlat) and (target.qtrmin_long = @qtrminlng) 
    when matched and @areaId = 0 
     then delete 
    when matched then 
      update 
      set [area_id] = @areaId 
    when not matched then --return a bit flag or something 
    insert([qtrmin_lat], [qtrmin_long], [area_id], [long_length], [call_center]) 
    values(source.qtrmin_lat, source.qtrmin_long, source.area_id, 1, source.call_center); 

END 

這可能嗎？

Answer 1

您可以使用output條款，這裏是一個小例子：

select 1 a, 1 b into #t0 
union all select 2, 2 
union all select 3, 3 

select 1 a, 1 b into #t1 
union all select 2, 2 
union all select 4, 4 

declare @t table (a int, b int); 
merge 
    #t0 t0 
using 
    #t1 t1 on t0.a = t1.a 
when matched then 
    update set t0.b = t0.b 
output 
    inserted.a, inserted.b 
into 
    @t (a, b) 
; 

select * from @t; 

表@t將包含匹配的值。您可以使用它來設置您的標誌變量，

if exists(select * from @t) begin 
-- .. 
end;