Question

Table Not Updating

Asked by: NigelRocks

Hello,

I have a piece of code that writes to three different tables in three databases.  Everything works except the attempt to write records to the second table on the first database.  It was working before, but now I can't put records in it.

I have checked, and the correct connection string is indeed pointing to the right database at the right time.  Is it possible that there is some sort of lock on the table in question and that I'm not being informed of it when the program runs?

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Asked On
2009-10-21 at 06:22:04ID24830456
Tags

VB.NET

,

SQL Server

Topics

MS SQL Server

,

SQL Server 2005

,

Visual Basic Programming

Participating Experts
1
Points
500
Comments
16

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Answers

 

by: WesWilsonPosted on 2009-10-21 at 06:37:30ID: 25623749

Please provide the Stored Procedure that is failing (if it is a Stored Procedure) and the code that writes to these databases.

 

by: NigelRocksPosted on 2009-10-21 at 06:52:54ID: 25623945

It's actually inline SQL:


sb.Append("INSERT INTO AgentRole (AgentID, RoleID) ")
sb.Append("VALUES(")
sb.Append(AgentID.ToString)
sb.Append(", ")
sb.Append(RoleID.ToString)
sb.Append(")")

 

by: WesWilsonPosted on 2009-10-21 at 06:59:55ID: 25624009

Do you get an error when you execute this code? If so, what is the error?

I assume AgentID and RoleID are integers. Are there foreign key constraints on either field?

 

by: NigelRocksPosted on 2009-10-21 at 07:06:46ID: 25624074

No, I don't get an error.  The same code works on other databases and was working on this one.

AgentID and RoleID are integers.  

 

by: WesWilsonPosted on 2009-10-21 at 07:08:43ID: 25624102

You haven't posted much of the code that executes this query yet, but I assume you are using ExecuteNonQuery, which returns the number of rows affected. How many rows does it say are affected?

 

by: NigelRocksPosted on 2009-10-21 at 07:16:48ID: 25624198

I've posted all the code that executes the query.  It's inline SQL.

 

by: WesWilsonPosted on 2009-10-21 at 07:33:08ID: 25624355

I see the code that builds the SQL statement. But I don't see the database access code that runs this query. Are you checking the number of rows affected in your code?

 

by: NigelRocksPosted on 2009-10-21 at 08:51:54ID: 25625209

It's in the attached code.  I'll check out the value of "value".

  Protected Function GetScalarResult(ByVal commandText As String, ByVal sqlType As CommandType) As Object
 
            Dim value As Object
 
            Try
                'Set the command object.
                _sqlCommand = CreateSQLCommand(commandText, sqlType)
 
                'Data Reader.
                value = _sqlCommand.ExecuteScalar
 
                'Clear parameters
                ClearParameters()
 
                Return value
 
            Catch ex As SqlException
 
                If DBTransaction Then
                    RollbackTrans()
                End If
 
                Throw ex
 
            Catch ex As Exception
 
                If DBTransaction Then
                    RollbackTrans()
                End If
 
                Throw ex
 
            Finally
 
                'Disconnect from the database.
                If DBTransaction = False Then
                    Disconnect()
                Else
                    Throw New Exception("There is a current transaction. Call Rollback or Commit methods.")
                End If
 
            End Try
 
        End Function

                                              
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by: WesWilsonPosted on 2009-10-21 at 09:01:26ID: 25625309

Perhaps part of the issue is that ExecuteScalar expects a result to return. For Insert, Update, and Delete statements, I recommend using ExecuteNonQuery instead of ExecuteScalar.

ExecuteNonQuery should return an integer equal to the number of rows affected.

 

by: WesWilsonPosted on 2009-10-21 at 09:04:46ID: 25625352

A very minor hint not related to the problem at hand, is that when you want to re-throw an exception, it is a best practice to invoke:

Throw      'pass original exception up the chain without modifying stack trace

instead of

Throw ex    'this line will appear as the origin of the exception in the stack trace

 

by: NigelRocksPosted on 2009-10-21 at 11:13:13ID: 25626666

I don't think that a return value is the issue, since the same code works on the exact same schema on other servers.

 

by: WesWilsonPosted on 2009-10-21 at 11:21:16ID: 25626737

What I'm trying to find out with the return value (if you use ExecuteNonQuery, as recommended) is if the database is saying it performed the insert. The return value of ExecuteScalar would be irrelevant, as this query doesn't get a value back.

The next thing to try would be to run the query in SQL Server Management Studio and see if it works.

How do you know it isn't working? Are you comparing the number of rows in the table before and after or looking for the values that were supposed to be inserted?

I would also look at the table structure. Is either of these fields an Identity column? Is there a trigger defined on this table that might be altering or deleting data?

 

by: NigelRocksPosted on 2009-10-22 at 12:53:41ID: 25638271

Running it in a query window worked, but it still doesn't work from the code.  

 

by: WesWilsonPosted on 2009-10-22 at 13:47:33ID: 25638848

Please use ExecuteNonQuery to execute the SQL statement and see what the return value is.

 

by: WesWilsonPosted on 2009-10-22 at 13:50:18ID: 25638874

You might also check the other databases and see if one of them is getting the values inserted. Perhaps the wrong connection string is getting passed in.

 

by: WesWilsonPosted on 2009-11-02 at 06:35:09ID: 25719631

Have you gotten this issue resolved?

20120131-EE-VQP-002

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