Question

我对此程序有疑问。它使用了几个临时表，它们会丢弃并重新创建。这导致了大量的崩溃，我只能假设冲突正在发生。

ALTER PROCEDURE [dbo].[AdditionalVisits_SelectByOrigID] 
(
@orig_job_ID int
)
as

if exists (select * from INFORMATION_SCHEMA.TABLES where TABLE_NAME =   'additionalVisitsPodsCnt')
    drop table additionalVisitsPodsCnt;

SELECT     CONVERT(bit, COUNT(PODS.podID)) AS cnt, AdditionalVisits.this_job_id, AdditionalVisits.orig_job_id
INTO            additionalVisitsPodsCnt
FROM         PODS RIGHT OUTER JOIN
                  AdditionalVisits ON PODS.jobID = AdditionalVisits.this_job_id
GROUP BY AdditionalVisits.this_job_id, AdditionalVisits.orig_job_id
HAVING      (AdditionalVisits.orig_job_id = @orig_job_ID)

if exists (select * from INFORMATION_SCHEMA.TABLES where TABLE_NAME = 'additionalVisitsPhotosCnt')
drop table additionalVisitsPhotosCnt;

SELECT     CONVERT(bit, COUNT(Photos.photoID)) AS cnt, AdditionalVisits.this_job_id, AdditionalVisits.orig_job_id
INTO            additionalVisitsPhotosCnt
FROM         Photos RIGHT OUTER JOIN
                  AdditionalVisits ON Photos.jobID = AdditionalVisits.this_job_id
GROUP BY AdditionalVisits.this_job_id, AdditionalVisits.orig_job_id
HAVING      (AdditionalVisits.orig_job_id = @orig_job_ID)

SELECT     AdditionalVisits.id, AdditionalVisits.this_job_ID, AdditionalVisits.orig_job_ID, AdditionalVisits.reason, AdditionalVisits.date, ThisJob.Job_Reference_No, 
                  ThisJob.Job_POD_Filename, ThisJob.Job_Photo_Filename,    ThisJob.Job_Signed_For_Name, ThisJob.Job_Value, ThisJob.Job_Advance_Payment, 
                  ThisJob.Job_Eoj_Payment, ThisJob.Job_Status, ThisJob.Job_Date_Added, ThisJob.Job_Start_Date, additionalVisitsPhotosCnt.cnt AS Job_Photo_Supplied, 
                  additionalVisitsPodsCnt.cnt AS Job_POD_Supplied
FROM         AdditionalVisits INNER JOIN
                  Jobs AS ThisJob ON AdditionalVisits.this_job_ID = ThisJob.Job_ID    INNER JOIN
                  additionalVisitsPodsCnt ON AdditionalVisits.this_job_ID = additionalVisitsPodsCnt.this_job_id INNER JOIN
                  additionalVisitsPhotosCnt ON AdditionalVisits.this_job_ID = additionalVisitsPhotosCnt.this_job_id
WHERE     (AdditionalVisits.orig_job_ID = @orig_job_ID) AND (ThisJob.Job_Status <> 7)

我得到的错误如下：

Cannot drop the table 'additionalVisitsPodsCnt', because it does not exist or you do not have permission. There is already an object named 'additionalVisitsPodsCnt' in the database.

或

 Invalid object name 'additionalVisitsPhotosCnt'.

这些错误是间歇性的。有时它只是有效。

有更好的方法吗？

Answer 1

当然，如果此表仅用于此一个过程，请使用“真实”local temporary table（在tempdb中创建），在表名前添加#：

SELECT  CONVERT(bit, COUNT(PODS.podID)) AS cnt, 
        AdditionalVisits.this_job_id, AdditionalVisits.orig_job_id
INTO            #additionalVisitsPodsCnt
FROM         PODS ....

这样，它就会与所有其他会话隔离，即使其他人对此过程进行了并发调用。

Answer 2

这是我用于#temp表的正常模式。（注意＆＃34;＃＆＃34;前缀）。

IF OBJECT_ID('tempdb..#TableOne') IS NOT NULL
begin
        drop table #TableOne
end


CREATE TABLE #TableOne
( 
SurrogateKey int , 
NameOf varchar(12)
)


/*
Do something with temp table
*/




IF OBJECT_ID('tempdb..#TableOne') IS NOT NULL
begin
        drop table #TableOne
end

Answer 3

考虑使用表变量。

This StackOverflow topic解释它比我更好......;）

SQL Server 2005 - 在多用户环境中使用临时表

3 个答案: