Can Multi-CPU Spawn Several SPIDs From One SP Execution?
Jan 24, 2008
Hi,
The myComplexProc stored proc does the following in sequence:
1. Call a UDF
2. Call another Stored Proc
3. Make a SELECT with 4 joins
4. Make another SELECT 4 joins + aggregate.
Question1: if myComplexProc is executed on 4-CPUs SQL2K Server, does it start and complete with a single SPID?
Question2: Is SQL2K smart enough to do some sort of parallelism behind the scene? If yes, can it spawn some extra SPIDs? How does it handle lock or sequencing? Because in the hypothetic scenario above Step N+1 re-uses the results of Step N so it has to wait for Step N to complete.
Thanks very much in advance for any help.
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May 15, 2008
We have a number of customers using the same database and ASP application. We need to run a script that modifies the database to the latest version. If the script runs twice it will cause problems so we need to build in a fail safe way of stopping it running a second time.
To do this we can update a version table at the end of the script. At the start of the script we check that the version is the previous one. If it isn't then we need to abort the enitre script. The problem is that the RETURN statement will only exit the current batch and execution of the script will continue from the next GO statement.
Is there any way to stop a multi-batch script running if a certain condition is met in one batch in such a way that the remaining batches do not run?
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Feb 18, 2005
Hi boys and girls,
all of the sudden two days ago there are error messages started to appear in SQL Log, the server slows down substantially during these errors occurance:
SQL Server could not spawn process_loginread thread.
and
ERROR: Launch of System Task 'OnDemand' failed!
Any ideas of the best way to troubleshoot/reproduce it?
I run SQL2000 Ent on NT Server 2000 Advance. SP3a installed.
3.5Gb memmory allocated to the server with AWE anabled.
Any help appreciated.
Cheers.
Dim
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Apr 20, 2007
We really like using the Matrix reports, but we were finding that every Matrix report that we created would spawn an extraneous blank page. We tried putting the matrix in a rectangle, which works well for positioning other items on reports, but this had no effect on the problem.
Then we tried placing the matrix in a list with the list group details set to "=Nothing". It worked great - no more extra pages. Looked and didn't see this tip mentioned elsewhere so thought it might be worth sharing.
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Mar 6, 2007
Hello All,
Suddenly, the sql server is down, in the log file, C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLLOGERRORLOG, I found the record as follows,
2007-03-05 15:40:31.59 Logon Error: 17189, Severity: 16, State: 1.
2007-03-05 15:40:31.59 Logon SQL Server failed with error code 0xc0000000 to spawn a thread to process a new login or connection. Check the SQL Server error log and the Windows event logs for information about possible related problems. [CLIENT: 172.21.123.48]
What else I can do to further investigate?
Thanks
Spencer
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Nov 13, 2007
is there any way to get all the SPID's running a particular Stored Proc?
Thx
Venu
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Feb 22, 2001
We have just combined 3 sites into one server.
Two of the sites are serving fine, however one site has spids
that won't disconnect. By the end of the day there are over 600 spids
from that one site. At first we thought it was due to the ASP pages
had a db connect, but nothing that closed that db connection. But after
they modified the pages, we are still having the same problem. Checked
the webserver and they are identical to the other webservers.
Any ideas???
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Jan 24, 2008
A developer came over and asked me a couple of things
1. Can C# not cleanup SPIDs and just open new ones lieing around
2. Do a large number of spids, even if they are sleeping, cause performance issues?
3. What's the Max # of spids sql server can handle?
BOL ain't too helpful right now
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Jul 23, 2005
SQL Server 2000Just curious - was wondering why some SPIDS are left hanging out therefor up to several weeks. There are no errors or anything. It looks likenormal processing.Thanks,Craig
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May 22, 2001
I have an issue with a server where some users are recieving error messages along the lines of "There are currently 250 connected users etc....". the result of which is that the users sometimes can't connect. The server properties have Current Users set to 250 - I know that I could increase this figure but that doesnt't appear to be the problem.
It would seem that connections appear to stay connected even though the user has finished any server/client transactions. Also there seems to be a huge number of SPIDs even when there are only a handfull of users. Most of the 'Process Details' for these user threads show the following: "IF @@TRANCOUNT > 0 COMMIT TRAN".
What is going on and why are these Process IDs hanging around, sometimes the only option is to reboot the client PCs since trying to kill the processes just makes them reappear a few seconds later?
It could be the 32-bit client application causing it, but these problems are only on one server out of half a dozen.
Any ideas?
Thanks, Derek.
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Oct 19, 2005
Hey guys,
I've recently noticed some strange behaviour with sql server 2000 spid's blocking themselves. The spid will appear to be blocked for short periods of time, and then the block will disappear. I'm not sure how this could occur. It started appearing around the same time as I applied SP4.
If anyone could provide any insight into this, it would be greatly appreciated.
Cheers,
-Kilka
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Jul 20, 2005
We are using Merge replication with clients from remote offices (SQL2000, sp3). Recently, I have had a problem with users who arereplicating, and they shut down their laptops. The connection neverdies, and I end up with major blocking issues related to the"orphaned" spid. The tables that are blocked are used to filter dataon each client. Since the orphaned spid is blocking, backups will runforever, and have to be killed, and a SQL management job thatinserts/updates data in these tables has to be killed.If I kill the spid, it shows a rollback at 0% and the status neverchanges. The user has disconnected, and there is really nothing toroll back. How can I get rid of this spid with out restarting SQLserver, or rebooting my server?Any help would be greatly appreciated.Thanks,Amy M
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Nov 10, 2003
A fellow developer of mine has created a ASP.Net application that executes some fairly complex stored procedures. This application is for all intensive purposes a queue and 3 or 4 people work on processing items in a FIFO type environment. There is logic in the Stored procedures to make sure each worker get a unique entry using a series of query hints.
Well what we are seeing is if these works are moving at a rapid pace and we execute an sp_who2 on the sql server there are entries that that seems to be hanging there and REMAINING there even after a browser is closed or the disposed method has been called on the connection object. Has anyone else experienced something similar to this with an ASP.Net application used by mutiple people?
My inclination is to blame the design of the application, but before I do that and step on my co-workers toes I thought I would throw this out to the group.
Thanks in advance for your input.
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Jul 23, 2005
I wonder if anyone has any hard fact based pro or contra, especially onperformance, about having views as opposed to tables when the object isbeing accessed for read only by multiple sessions/users/spids. I amparticularly concerned about the multiple instantiations of the view.Relevant thoughts on this are much appreciated.Thanks,Caveman
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Mar 20, 2000
I need a stored proc to kill spids, but the following sproc loops infinitely with the same [correct] spid being printed out. What am I doing wrong?
The select statement, when I execute it via the query grid, returns the correct and finite number of spids.
Any help greatly appreciated.
Judith
CREATE PROCEDURE rasp_KillDBProcess
@dbname varchar(128)
AS
declare @KillSpid smallint
declare @SQL varchar(1000)
--
declare DBCursor cursor Forward_only for SELECT distinct l.spid
FROM master.dbo.syslocks l INNER JOIN
master.dbo.sysdatabases d ON l.dbid = d.dbid
WHERE (d.name = N'coj_pcisdata')
open DBCursor
--
Fetch next from DBCursor into @Killspid
--
While (@@Fetch_status <> -1)
Begin
If (@@Fetch_status <> -2)
begin
print 'spid = ' + cast(@killspid as varchar(12))
--exec ('kill ' + @killspid)
end
--
end
Fetch next from DBCursor into @Killspid
--
close dbcursor
deallocate dbcursor
print 'end'
return
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Jun 1, 2004
I have issued a simple insert statement on table and the statement could not insert a single row into the table.When i check the locks on the tables i found that almost 5000(five thousand) locks on the table for a single user with different SPID(s).
The user is and sql server user(not a windows user) and used to connect to the application.I wanted to disconnect the user from the DB so that all the locks will be freed.But i dunno how to disconnect a user from the DB. I know that i can issue KILL command to Terminate a user process based on the system process ID,but here the same user has nearly 1000 SPIDs.I thought that it would be very big job to kill each and every process and restared the sql server.but i guess its not the correct process to do.
how can i dosconnect a specific user from the DB.
Thanks.
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Nov 6, 2015
I've installed the MDW (Mangement Data Warehouse) database on our central monitoring SQL Server. I've then added a number of servers to be monitored. The data is collected on the servers that are being monitored and uploaded to the central MDW Monitoring server.
On the servers that are being monitored, I'm seeing a large number (over 1000) of SPIDs being generated by 'SQL Server Data Collector'.
Is this normal behaviour? I've seen more blocking as a result of this.
Is there any way to reduce the number of SPIDs generated?
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Sep 23, 2014
Disaster Recovery Options based on the following criteria.
--Currently running SQL 2012 standard edition
--We have 18000 databases (same schema across databases)- majority of databases are less than 2gb-- across 64 instances approximately
--Recovery needs to happen within 1 hour (Not sure that this is realistic
-- We are building a new data center and building dr from the ground up.
What I have looked into is:
1. Transactional Replication: Too Much Data Not viable
2. AlwaysOn Availability Groups (Need enterprise) Again too many databases and would have to upgrade all instances
3. Log Shipping is a viable option and the only one I can come up with that would work right now. Might be a management nightmare but with this many databases probably all options with be a nightmare.
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Aug 17, 2015
More often than not, I typically don't touch DTC on clusters anymore; however on a project where the vendor states that it's required. So a couple things here.
1) Do you really need DTC per instance or one for all?
2) Should DTC be in its own resource group or within the instance's group?
2a) If in it's own resource group, how do you tie an instance to an outside resource group? tmMappingSet right?
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Feb 4, 2008
the stored procedure don't delete all the records
need help
Code Snippet
DECLARE @empid varchar(500)
set @empid ='55329429,58830803,309128726,55696314'
DELETE FROM [Table_1]
WHERE charindex(','+CONVERT(varchar,[empid])+',',','+@empid+',') > 0
UPDATE [empList]
SET StartDate = CONVERT(DATETIME, '1900-01-01 00:00:00', 102), val_ok = 0
WHERE charindex(','+CONVERT(varchar,[empid])+',',','+@empid+',') > 0
UPDATE [empList]
SET StartDate = CONVERT(DATETIME, '1900-01-01 00:00:00', 102), val_ok = 0
WHERE charindex(','+CONVERT(varchar,[empid])+',',','+@empid+',') > 0
TNX
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Aug 23, 2007
after moving off VS debugger and into management studio to exercise our SQLCLR sp, we notice that the 2nd execution gets an error suggesting that our static SqlCommand object is getting reused from the 1st execution (of the sp under mgt studio). If this is expected behavior, we have no problem limiting our statics to only completely reusable objects but would first like to know if this is expected? Is the fact that debugger doesnt show this behavior also expected?
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Jul 20, 2005
Hello,I am trying to construct a query across 5 tables but primarily 3tables. Plan, Provider, ProviderLocation are the three primary tablesthe other tables are lookup tables for values the other tables.PlanID is the primary in Plan andPlanProviderProviderLocationLookups---------------------------------------------PlanIDProviderIDProviderIDLookupTypePlanNamePlanIDProviderStatusLookupKeyRegionIDLastName...LookupValue....FirstName...Given a PlanID I want all the Providers with a ProviderStatus = 0I can get the query to work just fine if there are records but what Iwant is if there are no records then I at least want one record withthe Plan information. Here is a sample of the Query:SELECT pln.PlanName, pln.PlanID, l3.LookupValue as Region,p.ProviderID, p.SSNEIN, pl.DisplayLocationOnPCP,pl.NoDisplayDate, pl.ProviderStatus, pl.InvalidDate,l1.LookupValue as ReasonMain, l2.LookupValue as ReasonSub,pl.InvalidDataFROM Plans plnINNER JOIN Lookups l3 ON l3.LookupType = 'REGN'AND pln.RegionID = l3.Lookupkeyleft outer JOIN Provider p ON pln.PlanID = p.PlanIDleft outer JOIN ProviderLocation pl ON p.ProviderID = pl.ProviderIDleft outer JOIN Lookups l1 ON l1.LookupType = 'PLRM'AND pl.ReasonMain = l1.LookupKeyleft outer JOIN Lookups l2 ON l2.LookupType = 'PLX1'AND pl.ReasonSub = l2.LookupkeyWHERE pln.PlanID = '123456789' AND pl.ProviderStatus = 0ORDER BY p.PlanID, p.ProviderID, pl.SiteLocationNumI know the problew the ProviderStatus on the Where clause is keepingany records from being returned but I'm not good enough at this toanother select.Can anybody give me some suggestions?ThanksDavid
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Dec 7, 2005
Hi I am slowly getting to grips with SQL Server. As a part of this, I have been attempting to work on producing more efficient queries. This post is regarding what appears to be a discrepancy between the SQL Server execution plan and the actual time taken by a query to run. My brief is to produce an attendance system for an education establishment (I presume you know I'm not an A-Level student completing a project :p ). Circa 1.5m rows per annum, testing with ~3m rows currently. College_Year could strictly be inferred from the AttDateTime however it is included as a field because it a part of just about every PK this table is ever likely to be linked to. Indexes are not fully optimised yet. Table:CREATE TABLE [dbo].[AttendanceDets] ([College_Year] [smallint] NOT NULL ,[Group_Code] [char] (12) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,[Student_ID] [char] (8) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,[Session_Date] [datetime] NOT NULL ,[Start_Time] [datetime] NOT NULL ,[Att_Code] [char] (1) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ) ON [PRIMARY]GO CREATE CLUSTERED INDEX [IX_AltPK_Clust_AttendanceDets] ON [dbo].[AttendanceDets]([College_Year], [Group_Code], [Student_ID], [Session_Date], [Att_Code]) ON [PRIMARY]GO CREATE INDEX [All] ON [dbo].[AttendanceDets]([College_Year], [Group_Code], [Student_ID], [Session_Date], [Start_Time], [Att_Code]) ON [PRIMARY]GO CREATE INDEX [IX_AttendanceDets] ON [dbo].[AttendanceDets]([Att_Code]) ON [PRIMARY]GOALL inserts are via an overnight sproc - data comes from a third party system. Group_Code is 12 chars (no more no less), student_ID 8 chars (no more no less). I have created a simple sproc. I am using this as a benchmark against which I am testing my options. I appreciate that this sproc is an inefficient jack of all trades - it has been designed as such so I can compare its performance to more specific sprocs and possibly some dynamic SQL. Sproc:CREATE PROCEDURE [dbo].[CAMsp_Att] @College_Year AS SmallInt,@Student_ID AS VarChar(8) = '________', @Group_Code AS VarChar(12) = '____________', @Start_Date AS DateTime = '1950/01/01', @End_Date as DateTime = '2020/01/01', @Att_Code AS VarChar(1) = '_' AS IF @Start_Date = '1950/01/01'SET @Start_Date = CAST(CAST(@College_Year AS Char(4)) + '/08/31' AS DateTime) IF @End_Date = '2020/01/01'SET @End_Date = CAST(CAST(@College_Year +1 AS Char(4)) + '/07/31' AS DateTime) SELECT College_Year, Group_Code, Student_ID, Session_Date, Start_Time, Att_Code FROM dbo.AttendanceDets WHERE College_Year = @College_YearAND Group_Code LIKE @Group_CodeAND Student_ID LIKE @Student_IDAND Session_Date <= @End_DateAND Session_Date >=@Start_DateAND Att_Code LIKE @Att_CodeGOMy confusion lies with running the below script with Show Execution Plan:--SET SHOWPLAN_TEXT ON--Go DECLARE @Time as DateTime Set @Time = GetDate() select College_Year, group_code, Student_ID, Session_Date, Start_Time, Att_Code from attendanceDetswhere College_Year = 2005 AND group_code LIKE '____________' AND Student_ID LIKE '________'AND Session_Date <= '2005-11-16' AND Session_Date >= '2005-11-16' AND Att_Code LIKE '_' Print 'First query took: ' + CAST(DATEDIFF(ms, @Time, GETDATE()) AS VarCHar(5)) + ' milli-Seconds' Set @Time = GetDate() EXEC CAMsp_Att @College_Year = 2005, @Start_Date = '2005-11-16', @End_Date = '2005-11-16' Print 'Second query took: ' + CAST(DATEDIFF(ms, @Time, GETDATE()) AS VarCHar(5)) + ' milli-Seconds'GO --SET SHOWPLAN_TEXT OFF--GOThe execution plan for the first query appears miles more costly than the sproc yet it is effectively the same query with no parameters. However, my understanding is the cached plan substitutes literals for parameters anyway. In any case - the first query cost is listed as 99.52% of the batch, the sproc 0.48% (comparing the IO, cpu costs etc support this). BUT the text output is:(10639 row(s) affected) First query took: 596 milli-Seconds (10639 row(s) affected) Second query took: 2856 milli-SecondsI appreciate that logical and physical performance are not one and the same but can why is there such a huge discrepancy between the two? They are tested on a dedicated test server, and repeated running and switching the order of the queries elicits the same results. Sample data can be provided if requested but I assumed it would not shed much light. BTW - I know that additional indexes can bring the plans and execution time closer together - my question is more about the concept. If you've made it this far - many thanks.If you can enlighten me - infinite thanks.
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Aug 3, 2007
Hello :
How to execute a procedure stored during execution of the report, that is before the poster the data.
Thnak you.
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Mar 27, 2007
I am new to Reporting Services and hope that what I am looking to do is within capabilities :-)
I have many identical schema databases residing on a number of data servers. These support individual clients accessing them via a web interface. What I need to be able to do is run reports across all of the databases. So the layout is:
Dataserver A
Database A1
Database A2
Database A3
Dataserver B
Database B1
Database B2
Dataserver C
Database C1
Database C2
Database C3
I would like to run a report that pulls table data from A1, A2, A3, B1, B2, C1, C2, C3
Now the actual number of servers is 7 and the number of databases is close to 1000. All servers are running SQL2005.
Is this something that Reporting Services is able to handle or do I need to look at some other solution?
Thanks,
Michael
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Nov 29, 2004
Here's my case, I have written a stored procedure which will perform the following:
1. Grab data from a table using cursor,
2. Process data,
3. Write the result into another table
If I execute the stored procedure directly (thru VS.NET, or Query Analyser), it will run, but when I tried to execute it via a scheduled job, it fails.
I used the same record, same parameters, and the same statements to call the stored procedure.
Any idea?
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Jul 20, 2005
Greetings,We are trying to set up a set of "Leading Practices" for ourdevelopers, as well as ourselves, and hope some gentle reader canrecommend some documentation in favor of what appears to be the rightposition to take.We do not allow third party applications to run on our SQL Servers. Wewant to include DTS Packages under the definition of third partyapplications, insisting instead that the developers save theirpackages as COM Formatted files into their source code control systemsand run them from their app servers. The devlopers would like to hearthis from someone besides ourselves.While strong recomendations to remove guest access to MSDB altogetherabound, I have been unable to find a straight forward discussion ofthe advantages of structured file storage and app server off load ofDTS packages.Can anyone suggest any articles, white papers, rants, etc attemptingto formulate a solution to the benefits of taking msdb away fromguest, with the advantages of running DTS from an App server orworkstation platform, with the packages protected in source codecontrol?Thank youJohn Pollinsjpollins @ eqt . com
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Jul 7, 2006
The benefit of the actual execution plan is that you can see the actual number of rows passing through each step - compared to the estimated number of rows.But what about the "cost percentages" ?I believe I've read somewhere that these percentages is still just an estimate and is not based on the real execution.Does anyone know this and preferable have a link to something that documents it?Thanks
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Mar 1, 2007
Can I roll back certain query(insert/update) execution in one page if query (insert/update) in other page execution fails in asp.net.( I am using sqlserver 2000 as back end)
scenario
In a webpage1, I have insert query into master table and Page2 I have insert query to store data in sub table.
I need to rollback the insert command execution for sub table ,if insert command to master table in web page1 is failed. (Query in webpage2 executes first, then only the query in webpage1) Can I use System. Transaction to solve this? Thanks in advance
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Mar 22, 2001
Is it possible to create a stored procedure that can be used on multiple dBs??
For instance, I want to create a stored procedure and use it on DB1 and DB2.
Right now, I can create a stored procedure in DB1 but only I can run it.
I want to run the stored procedures on DB2 that I created in DB1..
I hope this makes sense..
Any insight into the workings of SPs would be most appreciated...
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Mar 13, 2007
-- declare table declare @Table1 table(ID int, Value int )-- Insert sample data provided into tableinsert into @Table1select 1 , 2 union allselect 2 , 1 union allselect 7 , 2 -- declare table declare @Table2 table(ID int, Value int )-- Insert sample data provided into tableinsert into @Table2select 1 , 2 union allselect 5 , 1 union allselect 3 , 2 -- declare table declare @Table3 table(ID int, Value int )-- Insert sample data provided into tableinsert into @Table3select 1 , 2 union allselect 2 , 1 union allselect 3 , 2 -- declare table declare @Table4 table(ID int, Value int )-- Insert sample data provided into tableinsert into @Table4select 5 , 2 union allselect 2 , 1 union allselect 10 , 2 /*Is there anyway I can write one sql query which will give me the following result:IDs = All unique ID from all tablesSumOfAllValueFromAllTables =for the same ID, value from Table1+for the same ID, value from Table2 + so on ...IDs - SumOfAllValueFromAllTables===============================1 - 62 - 33 - 45 - 37 - 210 - 2*/--I have tried by the following way, but for more tables, it is becoming complicated, because I have 12 tables.--Is there any better way to do it? Thanks for the help.select coalesce(t1.ID,t2.ID) as IDs, coalesce(sum(t1.value),0) +coalesce(sum(t2.value),0) as SumOfAllValueFromAllTablesfrom @Table1 t1full join @Table2 t2 on t1.id=t2.idgroup by t1.ID,t2.IDorder by IDs
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Jul 7, 2004
I have a search form that takes 5 inputs from textboxes or Drop Down Lists.
I built a query that works just fine in Analyizer, but the second i try to turn it into a sproc that takes parameters I can only get it to work with one parameter so far....
Here is the query that works just fine
Select ftr_location.loc_name, ftr_file.loc_id, ftr_file.file_date, ftr_file.file_type_id, ftr_file.acct_no,
ftr_file.cust_fname, ftr_file.cust_lname, ftr_status.status_name, ftr_file.destruction_date
FROM dbo.ftr_file
Inner Join ftr_location On ftr_location.loc_id = ftr_file.loc_id
Inner Join ftr_Status On ftr_status.status_id = ftr_file.status_id
Inner Join ftr_doc_types on ftr_doc_types.file_type_id = ftr_file.file_type_id
WHERE ftr_file.Loc_id = 18 and ftr_file.file_date= '12/4/2004'
GO
The sproc version that I cant get to work is:
CREATE PROCEDURE dbo.usp_ftr_searchfile_s
(
@ResultLocation int = null,
@ResultFileDate datetime = null
)
AS
DECLARE @SQLString VARCHAR(4000)
SET @SQLString = 'Select ftr_location.loc_name, ftr_file.loc_id, ftr_file.file_date, ftr_file.file_type_id, ftr_file.acct_no,'+
'ftr_file.cust_fname, ftr_file.cust_lname, ftr_status.status_name, ftr_file.destruction_date' +
' FROM dbo.ftr_file' +
' Inner Join ftr_location On ftr_location.loc_id = ftr_file.loc_id' +
' Inner Join ftr_Status On ftr_status.status_id = ftr_file.status_id' +
' Inner Join ftr_doc_types on ftr_doc_types.file_type_id = ftr_file.file_type_id' +
' WHERE 1=1 '
If @ResultLocation Is Not Null
Set @SQLString = @SQLString + 'And ftr_file.loc_id=' + cast @ResultLocation
If @ResultLocation Is Not Null
Set @SQLString = @SQLString + 'And ftr_file.file_date=' + cast @ResultFileDate
EXEC (@SQLString)
GO
Any feedback would be most helpful, as I can get it to work with one parameter but not when I add teh second in the mix.
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Apr 12, 2005
I have a dataadapter on my asp.net page and am having issues passing values to the sql statement. See below:
SELECT tblTemp.SensorID, tblSensor.SensorNum, tblTemp.TempTime, tblTemp.TempVal FROM tblTemp
INNER JOIN tblSensor ON tblTemp.SensorID = tblSensor.SensorID
WHERE (tblTemp.TempTime BETWEEN @From AND @To)
AND (tblTemp.SensorID IN (@Sensor))
ORDER BY tblTemp.TempTime
@Sensor is populated in vb with the selected values from a checkboxlist control. I attempted to test this in the "Data Adapter Preview" window, but continually get an error. Is there a way to pass multiple values to a parameter?
Any help would be appreciated, thanks!
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