Modify Message Order In Queue?
Jun 12, 2007
Is it possible to modify the sequence of messages in a SSB queue? Or to create messages so that their sequence is based on a value in the message rather than the order in which they were sent to the queue?
I am trying to determine if SSB will help me solve a situation where BizTalk needs to process a prescribed sequence of messages that may not be received in the correct order. (i.e. I need to resequence the messages). Each message contains a field with the sequence number and also a field identifying the total number of messages in the sequence.
I realise that the Sequential Convoy Aggregrator EAI pattern can potentially provide a solution to this, or even the Sequence Guards pattern by McGeeky, but I guess I was hoping that SSB might provide a slightly more efficient solution(?)
Thanks,
Dan
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Apr 18, 2006
Ok, im making some progress. So what i have is a Message Queue Task which is bound to a message queue connection manager (which 'tests' ok). The Message Queue Task is set to recieve, variable from string message (declared a variable of type string) and to remove the message from the queue. The output of that task is piped into the data flow task.
The data flow task expands into a XML Source which is configured to get its input from the string i declared in the Message Queue Task and i point the schemas path to an appropriate schema. I then pipe the output of that into a SQL server destination which ive mapped all the columns from the XML message to a table (which the SQL server destination created for me).
It all looks good on paper, and builds properly with no errors etc. There is already a message in the appropriate private queue. When i go to debug it, it just sits on the Message Queue Task node (its yellow) and goes no further. No data is put into the DB. I have put a watcher on the link between the XML Source and the SQL server destination, and can see no data being piped through.
Even if i send another message, the execution of my package doesnt step passed the Message Queue Task. Its just sitting there waiting for something? what? I thought it would block until there was a message on that queue, and then process it if and when it arrives. But it doesnt seem to do that.
Any ideas??
I read on MSDN that you need integration services installed. I have checked and i do, and its running. Is theres something else i need to configure?
Help!
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Aug 2, 2007
Simple Question.
I have a requirement to read XML Messages from a Remote private MSMQ.
These messages are essentially Database records that will need cleaning up and insterting into a Local Database table.
Is this possible with SSIS?
Would Biztalk be a more suitable tool for this type of process?
If its possible, are there any resources taht can point me in the right direction?
Thanks for your help!
J.
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Mar 7, 2007
I have a C# application that get data (i.e. select Firstname, LastName from person) to form a DataSet object (i.e. PersonName variable inside my code). Then I want to post this DataSet object into a local private queue (the path is: .privatemyTestQ). Note that I carefully labled the message to be "Variables Message" (as needed per anothre thread discussion here in this forum).
I created a receiving package, in which I want to use SSIS's Message Queue task to retreive the above DataSet object (from C# application). I got failure:
[Message Queue Task] Error: An error occurred with the following error message: "Root element is missing.".
However, As a comparison research, I created another SSIS sending-package. And I used ADO.NET provider to get the same data to store the sull result set in a package-level variable. Then I use Message Queue task to post this variable (i.e. object) to the same private queue above. Then I run my above receiving package. I was successful to read back the messge that I posted from SSIS sending package. (Please note that if I use OLEDB provider for sending package to get data from database, the MSMQ task for sending failed due to serializtion issue for __ComObject. With ADO.NET provider, the result set is represented as a type of DataSet).
I then curiously looked into message body from Computer Management Counsol. I found that message sent from SSIS is in SOAP format while message from my C# application is NOT in SOAP (but only in XML format). Obviously SSIS MSMQ task serialize objects into SOAP format.
Can anyone here please help on how to serialize my DataSet object from my C# app) in compliance with the MSMQ task's spec so that I can read message from Q using SSIS package.
I use Visual Studio 2005 and MSMQ 3.0 version.
Your help is appreciated.
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Sep 8, 2006
Hi There
I am having alot of trouble with the order in which messages are being delivered, here is my scenario.
I have a transaction action table :
message 1 - xml schema A.
message 2 - xml schema A.
message 3 - xml schema B.
message 4 - xml schema D.
I have the following SP:
BEGIN TRAN
BEGIN DIALOG CONVERSATION
SEND ON CONVERSATION message 1
BEGIN DIALOG CONVERSATION
SEND ON CONVERSATION message 2
COMMIT
AT the target i get message 1 in the queue first them message 2. But then i try this.
BEGIN TRAN
BEGIN DIALOG CONVERSATION
SEND ON CONVERSATION message 3
BEGIN DIALOG CONVERSATION
SEND ON CONVERSATION message 4
COMMIT
At the target i get message 4 first it has the lower queuing_order on the queue, somehow it got ont he queue first.
I have tried turning validation off on the mssage types as i thought it may have something to do with the xml, but same problem.
I then tried to do a commit after each message like this:
BEGIN TRAN
BEGIN TRAN
BEGIN DIALOG CONVERSATION
SEND ON CONVERSATION message 1
COMMIT
BEGIN TRAN
BEGIN DIALOG CONVERSATION
SEND ON CONVERSATION message 2
COMMIT
COMMIT
But message 4 still gets on the queue first . WTF is going on ?
The only way i can get this to work is like this.
BEGIN TRAN
BEGIN DIALOG CONVERSATION
SEND ON CONVERSATION message 1
WAITFOR DELAY '00:00:01'
BEGIN DIALOG CONVERSATION
SEND ON CONVERSATION message 2
COMMIT
Why does this work ? and why do i not have this issue with message 1 and 2? If it has soemthing to do with the xml what is it?
Please help.
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Jun 16, 2007
Hi was wondering whether it is possible to log somewhere outside SB that there are messages in the transmission_queue because the Target queue was disabled.
I was testing this scenario:
try to send messages on a disabled queue and log the problem.
But the transmission_status from the trasmission_queue is always empty.
This is the code that I tried to execute between the send and the commit and after the commit:
WHILE (1=1)
BEGIN
BEGIN DIALOG CONVERSATION .....
SEND ON CONVERSATION ......
if select count(*) from sys.transmission_queue <> 0
BEGIN
set @transmission_status = (select transmission_status from sys.transmission_queue where conversation_handle=@dialog_handle);
if @transmission_status = ''
--Successful send - Exit the LOOP
BEGIN
UPDATE Mytable set isReceivedSuccessfully = 1 where ID = @IDMessageXML;
BREAK;
END
ELSE
raiserror(@transmission_status,1,1) with log;
END
ELSE
BEGIN
UPDATE [dbo].[tblDumpMsg] set isReceivedSuccessfully = 1 where ID = @IDMessageXML;
BREAK;
END
END
COMMIT TRANSACTION;
As I wrote before the @transmission_status variable is always empty and I have the same result even if I put the code after the commit transaction!
Maybe what I'm trying to reach has no sense?
With the event notification I can notify when the queue is disable because the receive rollsback 5 times but what if by mistake the target queue is disabled outside the SB environment? I can I catch it and handle it properly?
Thank you!Marina B
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Jan 17, 2007
How To Use Message Queue Task In Integration Services
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Oct 2, 2006
I need to determine the actual date/time that a message was placed on the queue. In my "activated" procedure I want to log this information and pass it along to further processing routines. From what I can tell, the Queue table itself does not have this information captured.
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Sep 1, 2006
Hi Folks,
I've found a pretty good code example on http://www.dotnetfun.com for a Asynchronous Trigger.
I've parsed through the Code, to understand how to wirte my own Async Trigger with a Service Broker, but the Code isn't working! It seems that the stored procedure don't receive the messages in the queue, but the queue get's filled.
MessageType
CREATE MESSAGE TYPE myMsgXML
VALIDATION = WELL_FORMED_XML;
Contract
CREATE CONTRACT myContractANY
(myMsgXML SENT BY ANY)
Queue
CREATE QUEUE myQueue
WITH STATUS = ON,
RETENTION = ON,
ACTIVATION
(
STATUS = ON,
PROCEDURE_NAME = sp_myServiceProgram,
MAX_QUEUE_READERS = 5,
EXECUTE AS SELF
)
Service
CREATE SERVICE myService ON QUEUE myQueue (myContractANY)
Procedure (greped from http://www.dotnetfun.com/)
CREATE PROC sp_myServiceProgram
AS
-- This procedure will get triggered automatically
-- when a message arrives at the
-- Let's retrieve any messages sent to us here:
DECLARE @XML XML,
@MessageBody VARBINARY(MAX),
@MessageTypeName SYSNAME,
@ID INT,
@COL2 VARCHAR(MAX);
DECLARE @Queue TABLE (
MessageBody VARBINARY(MAX),
MessageTypeName SYSNAME);
WHILE (1 = 1)
BEGIN
WAITFOR (
RECEIVE message_body, message_type_name
FROM myQueue INTO @Queue
), TIMEOUT 5000;
-- If no messages exist, then break out of the loop:
IF NOT EXISTS(SELECT * FROM @Queue) BREAK;
DECLARE c_Test CURSOR FAST_FORWARD
FOR SELECT * FROM @Queue;
OPEN c_Test;
FETCH NEXT FROM c_Test
INTO @MessageBody, @MessageTypeName;
WHILE @@FETCH_STATUS = 0
BEGIN
-- Let's only deal with messages of Message Type
-- myMsgXML:
IF @MessageTypeName = 'myMsgXML'
BEGIN
SET @XML = CAST(@MessageBody AS XML);
-- Now let's save the XML records into the
-- historical table:
INSERT INTO tblDotNetFunTriggerTestHistory
SELECT tbl.rows.value('@ID', 'INT') AS ID,
tbl.rows.value('@COL2', 'VARCHAR(MAX)') AS COL2,
GETDATE() AS UPDATED
FROM @XML.nodes('/inserted') tbl(rows);
END
FETCH NEXT FROM c_Test
INTO @MessageBody, @MessageTypeName;
END
CLOSE c_Test;
DEALLOCATE c_Test;
-- Purge the temporary in-proc table:
DELETE FROM @Queue;
END
Send Message in a Update Trigger
SELECT @XML = (SELECT * FROM inserted FOR XML AUTO);
-- Send the XML records to the Service Broker queue:
DECLARE @DialogHandle UNIQUEIDENTIFIER,
@ConversationID UNIQUEIDENTIFIER;
/*
The target Service Broker service is the same
service as the initiating service; however, you
can set up this type of trigger to send messages
to a remote server or another database.
*/
BEGIN DIALOG CONVERSATION @DialogHandle
FROM SERVICE myService
TO SERVICE 'myService'
ON CONTRACT myContractANY;
SEND ON CONVERSATION @DialogHandle
MESSAGE TYPE myMsgXML
(@XML);
-- Let's detect an error state for this dialog
-- and rollback the entire transaction if one is
-- detected:
IF EXISTS(SELECT * FROM sys.conversation_endpoints
WHERE conversation_handle = @DialogHandle
AND state = 'ER')
RAISERROR('Dialog in error state.', 18, 127);
ELSE
BEGIN
--I want to list the queue after the trigger so I disabled
--END CONVERSATION @DialogHandle;
COMMIT TRAN;
END
The Problem is, that the Procedure doesn't even get started! So I tried to receive the Queues manually
WAITFOR (
RECEIVE message_body, message_type_name
FROM myQueue INTO @Queue
), TIMEOUT 5000;
and I run always into the timeout and get nothing back. A Select * FROM myQueue gives me some results back. Why I can't recevie?
Would be grateful for help, or at least a good tutorial, I haven't found one yet....
thx and greez
Karsten
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Mar 12, 2008
I have a strange situation in an Message queue task in SSIS.
I serialize an object in a C# application and add that to an MSMQ as a string. I also ensure that I set the label to "String Message" so that my Message Queue Task can actually receive the message as a String message to variable.
I created an SSIS package that has an Message Queue listener that feeds into a Script task inside a for-each loop.
For each message that I obtain, I invoke a script task that retrieves the value of the variable and then processes this information.
When I enter the entry into the MSMQ, it goes in perfectly fine (since I also tested retrieving this entry from a C# app). However when I use the same logic on the SSIS package using the Script task, I get junk chinese characters.
Has this happened to anyone else?
Any feedback would be great!
Anup
Here is the code for the script task:
mports System
Imports System.Data
Imports System.Math
Imports Microsoft.SqlServer.Dts.Runtime
Public Class ScriptMain
Public Sub Main()
Dim statusMessage As String
statusMessage = CType(ReadVariable("ReviewerHealthXmlMessage"), String)
System.Windows.Forms.MessageBox.Show(statusMessage)
Dts.TaskResult = Dts.Results.Success
End Sub
Private Function ReadVariable(ByVal varName As String) As Object
Dim result As Object
Try
Dim vars As Variables
Dts.VariableDispenser.LockForRead(varName)
Dts.VariableDispenser.GetVariables(vars)
Try
result = vars(varName).Value
Catch ex As Exception
Throw ex
Finally
vars.Unlock()
End Try
Catch ex As Exception
Throw ex
End Try
Return result
End Function
Private Sub WriteVariable(ByVal varName As String, ByVal varValue As Object)
Try
Dim vars As Variables
Dts.VariableDispenser.LockForWrite(varName)
Dts.VariableDispenser.GetVariables(vars)
Try
vars(varName).Value = varValue
Catch ex As Exception
Throw ex
Finally
vars.Unlock()
End Try
Catch ex As Exception
Throw ex
End Try
End Sub
End Class
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Jun 2, 2006
I am implementing a message queue system in SQL Server 2000. My queue table looks something like this:
[MessageId] [uniqueidentifier] NOT NULL,
[MessageType] [uniqueidentifier] NOT NULL,
[Status] [tinyint] NOT NULL,
[SubmittedTime] [datetime] NOT NULL,
[StartTime] [datetime] NOT NULL,
[DispatchedTime] [datetime] NULL,
[CompletedTime] [datetime] NULL,
[MessageData] [image] NULL
This is how I retrieve the next message for processing:
SELECT TOP 1 *
FROM [Queue].[MessageQueue] WITH (ROWLOCK, UPDLOCK, READPAST)
WHERE [StartTime]=@pStartTime AND [MessageType]=@pMessageType AND [Status]=@pStatus
ORDER BY [StartTime]
and mark it as being processed:
UPDATE [Queue].[MessageQueue] SET [Status]=1 WHERE [MessageId]=@pMessageId
After message has been processed I delete it from the queue:
DELETE FROM [Queue].[MessageQueue] WHERE [MessageId]=@pMessageId
All database accesses are transactional with default READ COMMITTED. The problems start when there are a few concurrent accesses: I get deadlocks when retrieving next message. If I do not delete message after processing then there is no deadlock. But this is not what I need.
I played with different isolation levels and locking hints and was able to avoid deadlock using TABLOCKX:
SELECT .... FROM [Queue].[MessageQueue] WITH (TABLOCKX)
But in this case you cannot concurrently retrieve messages which was my goal from the beginning. How do I achieve this?
Thank you,
Alex
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Feb 2, 2006
Hello,
I'm using the Message Queuing task to create a local private queue message. Everything works great on a 32 bit machine. When I try this on a 64 bit Itanium Cluster I keep getting the message "Message queue service is not available" in my SSIS log. I've using this string as my path "ClusterNameprivate$QueueName". Does anyone know of any issues with the Message Queue task on 64 bit or a cluster? The Message Queue service is up and running, it doesn't make sense.
Thanks,
Andy
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Nov 17, 2007
I'm trying to use the message queue task in SSIS 2005 and not getting very far. Right off the bat I'm trying to create a Message Queue Connection Manager and when I enter the path, trying both "seawxxxx estq" (my local computer name) or ". estq" and test it, it comes back with "invalid path". Have done quite a bit of searching around and can't find anything on this particular error.
Suggestions? Thanks in advance.
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Aug 14, 2007
Hi,
I am using distributed transactions where in I start a TransactionScope in BLL and receive data from service broker queue in DAL, perform various actions in BLL and DAL and if everything is ok call TransactionScope.Commit().
I have a problem where in if i run multiple instances of the same app ( each app creates one thread ), the threads pop out the same message and I get a deadlock upon commit.
My dequeue SP is as follows:
CREATE PROC [dbo].[queue_dequeue]
@entryId int OUTPUT
AS
BEGIN
DECLARE @conversationHandle UNIQUEIDENTIFIER;
DECLARE @messageTypeName SYSNAME;
DECLARE @conversationGroupId UNIQUEIDENTIFIER;
GET CONVERSATION GROUP @conversationGroupId FROM ProcessingQueue;
if (@conversationGroupId is not null)
BEGIN
RECEIVE TOP(1) @entryId = CONVERT(INT, [message_body]), @conversationHandle = [conversation_handle], @messageTypeName = [message_type_name] FROM ProcessingQueue WHERE conversation_group_id=@conversationGroupId
END
if @messageTypeName in
(
'http://schemas.microsoft.com/SQL/ServiceBroker/EndDialog',
'http://schemas.microsoft.com/SQL/ServiceBroker/Error'
)
begin
end conversation @conversationHandle;
end
END
Can anyone explain to me why the threads are able to pop the same message ? I thought service broker made sure this cannot happen?
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Jun 15, 2007
Hello,
I have almost finished to design my Service Broker application and I found out something strange.
I was tring to handle the Target queue disabled scenario, because I want to save to message that was not sent so I can create an alert to the user to say that some messages as not been sent.
To disable to queue I run:
Alter queue [dbo].[Receivedqueue] with status = off
I had the Event Viewer in front of me and I have seen the suddenly it appeared a lot of this informational events:
Event Type: Information
Event Source: MSSQLSERVER
Event Category: (2)
Event ID: 9724
Date: 15/06/2007
Time: 15:00:47
Description:
The activated proc [dbo].[OnReceived] running on queue TestReceiver.dbo.Receivedqueue output the following: 'The current transaction cannot be committed and cannot support operations that write to the log file. Roll back the transaction.'
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
What this message means?
I would like to avoid to have it because it appears a lot of time and I don't want to fill up my Event Viewer!!
I don't know of it is important but in the moment I executed the code there was not CONVERSING conversation and all the queues were empty.
Somebody has seen this error before or I have to send to the forum the [dbo].[OnReceived] code as well?
thankx
Marina B.
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Jan 15, 2008
This is the first time I've used SQL Server Integration Services, and I have it installed with SP2 applied on my local machine. I have created a Package, and dropped a Message Queue Task on it. I have pointed the Message Queue Connection Manager at a private queue on my machine. I have set the "Message" property to "Send message", I have changed the message type to "String Message" and entered "Test string" into the StringMessage property. When I execute the package (by clicking the "Start debugging" button on the toolbar), I get the following error message in the Execution Results:
[Message Queue Task] Error: An error occurred with the following error message: "The ServicedComponent being invoked is not correctly configured (Use regsvcs to re-register).".
There is no more diagnostic data that I can see in the Execution Results. Can anyone please explain to me how I can get this working?
Thanks!
Bryan
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Jun 4, 2015
the code below works (this is only a quick dumbed down version of the actual code, it might not work 100% for all cases). Is it at all possible to exploit the functions that were added to SSQL since v. 2005 to simplify this code ?
In SSRS, a parameter allows the user to create a list of invoices (from CRM) to be ordered in any of the following ways the user prefers:
'Document Date (most recent date first)'
'Document Number (highest number first)'
'Document Date (most recent first) and Number'
'Document Number (lowest number first)'
The invoices have a (supposedly) sequential identity-generated number. However Accounting may want to set a different date than the creation date on some invoices. So there is no way the invoice numbers will be in the same sequence as the invoice dates.
So I just created the "sorting fields" - they appear as junk in the output dataset (just do not drop them in the SSRS tablix - they have to be part of the SELECT statement to be usable in the ORDER BY clause.
The code is:
DECLARE @ls_OrderBy varchar(80)
--'Document Number (highest number first)'
--'Customer and Document Date (most recent date first)'
--'Customer and Document Number (highest number first)'
--'Document Date (most recent first) and Number'
[code]....
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May 12, 2007
I understand that SQL Service Broker will RECEIVE messages in the same order of SEND, so long as the messages are on the same conversation.
I would like to accomplish queue-level ordering instead of (or in addition to) conversation-level ordering.
There is a significant business case for this level of ordering. Consider an order processing system which is specified to fulfill orders in the sequence they are received. The reason for the ordering is as follows. Suppose the process(es) that RECEIVEs from the queue is down for several hours and the messages back up in the queue. Various customers place orders throughout this period of time. If more orders are placed than there are quantity for an item, the customers who placed their orders earliest in the day ought to be the ones that receive the merchandise and the later orders should be placed on backorder.
Limited experimentation showed that SQL Server totally disregards the order in which the messages were sent (on different conversations to the same queue).
The potential solution to use the same conversation has some drawbacks:
1. Difficult to do error handling because of the way error handling works in conversations.
2. It is not possible to RECEIVE using multiple threads. (Yes, RECEIVEing on multiple threads also would reorder the messages, but the reorderings would be localized in time so this would be tolerable by a lot of applications. In other words, orders from 1:00 AM would not be mixed with orders from 9:00 AM.)
Can anyone see a good solution to this in the current version?
If there are no good solutions, it would be great if Microsoft considers adding a feature where you can declare an ordering requirement when you CREATE QUEUE. Even support for an "approximate" ordering (messages can rearrange +/- several seconds) would be helpful, but the current way which seems to totally randomize the message order is not good for certain kinds of significant applications.
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Jan 11, 2006
Hello,
This is info that I am still not certain about and I just need to make sure, my gut feeling is correct:
A.
When a procedure is triggered upon reception of a message in a queue, what happens when the procedure fails and rolls back?
1. Message is left on the Queue.
2. is the worker procedure triggered again for the same message by the queue?
3. I am hoping the Queue keeps on triggering workers until it is empty.
My scenario is that my queue reader procedure only reads one message at a time, thus I do not loop to receive many messages.
B.
For my scenario messages are independent and ordering does not matter.
Thus I want to ensure my Queue reader procedures execute simultaneously. Is reading the Top message in one reader somehow blocking the queue for any other reader procedures? I.e. if I have BEGIN TRANSACTION when reading messages of the Queue, is that effectively going prevent many reader procedures working simultaneously. Again, I want to ensure that Service broker is effectively spawning procedures that work simultaneously.
Thank you very much for the time,
Lubomir
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Jul 23, 2007
In my SQL Server, I see the below message in the Application Event Viewer
"18265 :
Log backed up: Database: HSD, creation date(time): 2007/01/06(05:05:05), first LSN: 1439:495055:1, last LSN: 1439:496675:1, number of dump devices: 1, device information: (FILE=1, TYPE=DISK: {'D:MSSQLBACKUPHSDHSD_tlog_200707141300.TRN'})."
When I save the application event viewer and open it in another server, I do not see the above message, instead I get the following message:
" Can't find or load message DLL. Message DLL must be in path or in current directory."
Any thoughts to overcome this problem is appreciated.
Thanks
Santhosh
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Aug 8, 2007
I run SB between 2 SQL servers. In profiler on an initiator side I see next error: 'This message could not be delivered because its message timestamp has expired or is invalid'. For the conversation we use best practice, i.e. target closes a conversation. Target side succeed to close conversation, but initiator still stay in DO (disconnect_outbound).
What is a reasone for the error? What to do?
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Aug 8, 2007
I see in profiler this error: "This message could not be delivered because its message timestamp has expired or is invalid"
What is a reason for error?
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Jan 7, 2007
Finding the "pieces of information" I need to successfully install the SQL Server Express edition is so complex. Uninstalls do "not" really uninstall completely, leading to failure of SQL install. Can you suggest a thorough, one-stop site for directions for the order of app uninstalls and then the order for app installs for the following...
SQL Server Express edition
Visual Studios 2005
Jet 4.0 newest upgrade
.Net Framework 2.0 (or should I use 3.0)
VS2005 Security upgrade
Anything else I need for just creating a database for my VS2005 Visual Basic project?
I was trying to use MS Access as my backend db but would like to try SQL Express
Thank you, Mark
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Sep 24, 2012
In SQL sERVER 2008, I have two fields - Depatment and Employees. I need to sort the result set by employee number ascending order, with following exception
1)when department number = 50 - the preferred order is Employee # - 573 followed by 551-572 (employee # belong to Dept 50 = 551-573)
2)When Department number = 20 – the preferred sort order is Employee # 213-220, followed by Employee # 201-213 (employee # belong to Dept 20 = 201-220)
How shall I achieve this?
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May 19, 2015
I never paid much attention to this before but I noticed this today in a new table I was creating.
For tables defined in the tabular model the table properties have something like SELECT Blah FROM TableName ORDER BY Blah Then in the tabular model the table's data is in the same order it was ordered by in the data source for the table.
I have a date table I setup and I noticed it is NOT respecting the sort order.
I have it sorted by DateID which sorts with the oldest date first and newest date as last row.However, the table that is imported and stored in the data model is not in that order.
I can of course manually sort the rows in BIDS/DataTools, but I find this discrepancy odd.
Would this have negative impacts on the EARLIER function for example if the data rows are not in the order specified?
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Apr 10, 2014
I have a query that calculate the total amount of order details based on a particular order:
Select a.OrderID,SUM(UnitPrice*Quantity-Discount)
From [Order Details]
Inner Join Orders a
On a.OrderID=[Order Details].OrderID
Group by a.OrderID
My question is what if I wanted to create a formula to something like:
UnitPrice * Quantity - DiscountAmount Where DiscountAmount = UnitPrice Quantity * Discount
Do I need to create a function for that? Also is it possible to have m y query as a table variable?
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Mar 27, 2008
Hi!
I recently run into a senario when a procedure quiered a table without a order by clause. Luckily it retrived data in the prefered order.
The table returns the data in the same order in SQL Manager "Open Table"
So I started to wonder what deterimins the sort order when there is no order by clause ?
I researched this for a bit but found no straight answers. My table has no PK, but an identiy column.
Peace.
/P
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Jan 4, 2008
Hey guys, i need to find out how can i add order items under a Purchase Order number.
My table relationship is PurchaseOrder ->PurchaseOrderItem.
below is a Stored Procedure that i have wrote in creating a PO:
CREATE PROC spCreatePO (@SupplierID SmallInt, @date datetime, @POno SmallInt OUTPUT)
AS
BEGIN
INSERT INTO PurchaseOrder (PurchaseOrderDate, SupplierID) VALUES(@date, @SupplierID)
END
SET @POno = @@IDENTITY
RETURN
However, how do i make it that it will automatically adds item under the POno being gernerated? can i use a trigger so that whenever a Insert for PO is success, it automaticallys proceed to adding the items into the table PurcahseOrderItem?
CREATE TRIGGER trgInsertPOItem
ON PurchaseOrderItem
FOR INSERT
AS
BEGIN
'What do i entered???'
END
RETURN
help is needed asap! thanks!
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Nov 17, 2006
Hello,
I am having trouble specifying a message body that is valid. I mean for the client to send. If I leave it as null then everything is ok but if I create a memorystream and add a line of text it reports back it did not pass validation. I do not understand this and am not sure what to do. I need to send a message based on a code and text but do not know the format of the body that is allowed. The code I am refering to comes out of HelloWord_CLR because that is what I am formating my sample after. I call it the same way it calls the return message done in ServiceProc. I need to know the message format including body since this does not seem to work. A sample of the call is bellow.
// Create an empty request message
string Msg = "Hello";
MemoryStream body = new MemoryStream(Encoding.ASCII.GetBytes(Msg));
Message request = new Message("Request", body);
Thanks,
Scott Allison...
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May 8, 2007
hi basically what i have is 3 text boxes. one for start date, one for end date and one for order id, i also have this bit of SQL
SelectCommand="SELECT [Order_ID], [Customer_Id], [Date_ordered], [status] FROM [tbl_order]WHERE (([Date_ordered] >= @Date_ordered OR @Date_ordered IS NULL) AND ([Date_ordered] <= @Date_ordered2 OR @Date_ordered2 IS NULL OR (Order_ID=ISNULL(@OrderID_ID,Order_ID) OR @Order_ID IS NULL))">
but the problem is it does not seem to work! i am not an SQL guru but i cant figure it out, someone help me please!
Thanks
Jez
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Apr 14, 2008
Hi,
We got a problem.
supposing we have a table like this:
CREATE TABLE a (
aId int IDENTITY(1,1) NOT NULL,
aName string2 NOT NULL
)
go
ALTER TABLE a ADD
CONSTRAINT PK_a PRIMARY KEY CLUSTERED (aId)
go
insert into a values ('bank of abcde');
insert into a values ('bank of abcde');
...
... (20 times)
select top 5 * from a order by aName
Result is:
6Bank of abcde
5Bank of abcde
4Bank of abcde
3Bank of abcde
2Bank of abcde
select top 10 * from a order by aName
Result is:
11Bank of abcde
10Bank of abcde
9Bank of abcde
8Bank of abcde
7Bank of abcde
6Bank of abcde
5Bank of abcde
4Bank of abcde
3Bank of abcde
2Bank of abcde
According to this result, user see the first 5 records with id 6, 5, 4, 3, 2 in page 1, but when he tries to view page 2, he still see the records with id 6, 5, 4, 3, 2. This is not correct for users. :eek:
Of course we can add order by aid also, but there are tons of sqls like this, we can't update our application in one shot.
So I ask for your advice here, is there any settings can tell the db use default sort order when the order by column value are the same? Or is there any other solution to resolve this problem in one shot?
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Jul 20, 2005
Hi,guys!I have a table below:CREATE TABLE rsccategory(categoryid NUMERIC(2) IDENTITY(1,1),categoryname VARCHAR(20) NOT NULL,PRIMARY KEY(categoryid))Then I do:INSERT rsccategory(categoryname) VALUES('url')INSERT rsccategory(categoryname) VALUES('document')INSERT rsccategory(categoryname) VALUES('book')INSERT rsccategory(categoryname) VALUES('software')INSERT rsccategory(categoryname) VALUES('casus')INSERT rsccategory(categoryname) VALUES('project')INSERT rsccategory(categoryname) VALUES('disert')Then SELECT * FROM rsccategory in ,I can get a recordeset with the'categoryid' in order(1,2,3,4,5,6,7)But If I change the table definition this way:categoryname VARCHAR(20) NOT NULL UNIQUE,The select result is in this order (3,5,7,2,6,4,1),and 'categoryname 'in alphabetic.Q:why the recordset's order is not the same as the first time since'categoryid' is clustered indexed.If I change the table definition again:categoryname VARCHAR(20) NOT NULL UNIQUE CLUSTEREDthe result is the same as the first time.Q:'categoryname' is clustered indexed this time,why isn't in alphabeticorder?I am a newbie in ms-sqlserver,or actually in database,and I do havesought for the answer for some time,but more confused,Thanks for yourkind help in advance!
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Apr 14, 2008
Hi,
We got a problem.
supposing we have a table like this:
CREATE TABLE a (
aId int IDENTITY(1,1) NOT NULL,
aName string2 NOT NULL
)
go
ALTER TABLE a ADD
CONSTRAINT PK_a PRIMARY KEY CLUSTERED (aId)
go
insert into a values ('bank of abcde');
insert into a values ('bank of abcde');
...
... (20 times)
select top 5 * from a order by aName
Result is:
6 Bank of abcde
5 Bank of abcde
4 Bank of abcde
3 Bank of abcde
2 Bank of abcde
select top 10 * from a order by aName
Result is:
11 Bank of abcde
10 Bank of abcde
9 Bank of abcde
8 Bank of abcde
7 Bank of abcde
6 Bank of abcde
5 Bank of abcde
4 Bank of abcde
3 Bank of abcde
2 Bank of abcde
According to this result, user see the first 5 records with id 6, 5, 4, 3, 2 in page 1, but when he tries to view page 2, he still see the records with id 6, 5, 4, 3, 2. This is not correct for users.
Of course we can add order by aid also, but there are tons of sqls like this, we can't update our application in one shot.
So I ask for your advice here, is there any settings can tell the db use default sort order when the order by column value are the same? Or is there any other solution to resolve this problem in one shot?
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