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Transactions in VB.net

Posted on 2004-04-15
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Last Modified: 2013-12-25
Hello,

I am trying to use transactions in my VB.net program. I have opened a connection, and have opened a transaction on it and

Dim m_objConn As OleDb.OleDbConnection
Dim m_objTrans As OleDb.OleDbTransaction
Dim m_objDA As OleDb.OleDbDataAdapter

m_objTrans = m_objConn.BeginTransaction()

I have a function like this :

Public Function ExecuteCommand(ByVal strQuery As String) As DataSet

        '*** Create a new Data Adapter by passing the query and the connection
        '*** object to it. Fill the dataset against that Dataadapter and
        '*** return the dataset back to the calling function.
        Dim objDS As New DataSet()
        Dim objDA As New OleDb.OleDbDataAdapter(strQuery, m_objConn)


        objDA.Fill(objDS)

        Return objDS
End Function

I am not using any command object in the code.

1. Is that ok? Can i populate my DAtaSet without using the command object?
2. When I execute the program, an InvalidOperationException is thrown with the following additional info:

Execute requires the command to have a transaction object when the connection assigned to the command is in a pending local transaction. The transaction property of the command has not been initialized.

Now The question is, when I am not using the command object, why am I getting this error?


Thanks.
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Question by:manjirit
4 Comments
 
LVL 39

Expert Comment

by:appari
ID: 10838633

when you are not using any data update sqls like Insert/Update/Delete why to start a transaction?

Remove m_objTrans = m_objConn.BeginTransaction()
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LVL 7

Expert Comment

by:ramesh12
ID: 10839373
When you use Adapter,  internally the adapter object uses the Command objects

C here

http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemDataSqlClientSqlDataAdapterClassTopic.asp?frame=true
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Author Comment

by:manjirit
ID: 10869696
Hi Ramesh,

Thanks for ur reply. THe thing is I am using the data update sqls, which I pass into strQuery string. I need to have the beginTransaction on connection. The thing is the adapter may be using the command object internally. But since I am not using one explicitely, how can I enlist a transaction to it? I am using only strQuery string and no command object.
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LVL 41

Accepted Solution

by:
graye earned 200 total points
ID: 10921594
The use of the Oledb "flavor" of the ADO.Net suite is suspicous...  What database back-end are you using?  File-based databases (like Microsoft Access) aren't gonna support ADO.Net transactions.
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