Question

I have a DataSet that I have added to my project where I can Insert and Add records using the Add Query function in Visual Studio 2010, however I want to add transactions to this, I have found a few examples but cannot seem to find one that works with these.

I know I need to use the SQLClient.SQLTransaction Class somehow. I used the Add New Data Source Wizard and added the Tables/View/Functions I need, I just need an example using this process such as How to get the DataConnection my DataSet has used. Assuming all options have been set in the wizard and I am only using the pre-defined adapters and options asked for in this wizard, how to I add the Transaction logic to my Database.

For example I have a DataSet called ProductDataSet with the XSD created for this, I have then added my Stock table as a Datasource and Added an AddStock method with a wizard, this also if a new item calls an AddItem method, if either of these fails I want to rollback the AddItem and AddStock in this case.

Answer 1

In this example, I have a dataset called “dsMain” and a few direct queries in a “QueriesTableAdapter”. I extend the partial class for the TableAdapter with a function that will create a transaction based on the first (0) connection and then apply it to every connection in the table adapter.

Namespace dsMainTableAdapters
    Partial Public Class QueriesTableAdapter
        Public Function CreateTransaction() As Data.IDbTransaction   
            Dim oConnection = Me.CommandCollection(0).Connection
            oConnection.Open()

            Dim oTrans = oConnection.BeginTransaction()

            For Each cmd In Me.CommandCollection
                cmd.Connection = oConnection
                cmd.Transaction = oTrans
            Next

            Return oTrans
        End Function
    End Class
End Namespace

You begin the transaction by calling the new function

Dim qa As New dsMainTableAdapters.QueriesTableAdapter
Dim oTrans = qa.CreateTransaction()

Then you can call TableAdapter queries within your transaction

qa.Query1
qa.Query2

When you are done with your queries you commit the transaction

oTrans.Commit()

You can do the same thing for any TableAdapter that was created for your datasets.
If you have multiple TableAdapters that need to use the same transaction, then in addition to a “CreateTransaction” you should make a “SetTransaction” and have the Transaction be a parameter.