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' Open connection conn.Open() ' Begin transaction Dim sqltrans As SqlTransaction = conn.BeginTransaction() Try ' Create insert command Dim cmdins As SqlCommand = conn.CreateCommand() cmdins.CommandText = sqlins cmdins.Transaction = sqltrans cmdins.Parameters.Add("@newcustid", SqlDbType.NVarChar, 5) cmdins.Parameters.Add("@newconame", SqlDbType.NVarChar, 30) ' Create delete command Dim cmddel As SqlCommand = conn.CreateCommand() cmddel.CommandText = sqldel cmddel.Transaction = sqltrans cmddel.Parameters.Add("@oldcustid", SqlDbType.NVarChar, 5) ' Add customer cmdins.Parameters("@newcustid").Value = TextBox1.Text cmdins.Parameters("@newconame").Value = TextBox2.Text cmdins.ExecuteNonQuery() ' Delete customer cmddel.Parameters("@oldcustid").Value = TextBox3.Text cmddel.ExecuteNonQuery() ' Commit transaction sqltrans.Commit() ' No exception, transaction committed, give message MessageBox.Show("Transaction committed") Catch ex As System.Data.SqlClient.SqlException ' Roll back transaction sqltrans.Rollback()

Figure 10-7. Dragging the XMLConnector component into the Flash movie In the Properties panel, give the XMLConnector the name dvd_xc. In the Parameters tab, set the URL to dvd.xml and the direction to receive, as shown in Figure 10-8.

MessageBox.Show( _ "Transaction rolled back: " + ex.Message, _ "Rollback Transaction" _ ) Catch ex As System.Exception MessageBox.Show("System Error: " + ex.Message, "Error") Finally ' Close connection conn.Close() End Try

Execute the dir command to verify that your DSL Grammar, DSL, and schema files exist in this directory, and then compile the DSL Grammar code by entering the following command: m.exe LunchCounter.mg

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6. Run the program with Ctrl+F5. Try the same kinds of insertions and deletions as you did with sp_Trans_Test, but use b, bb, and bbb, instead of a, aa, and aaa, for the new customers. You should see the same kind of results, but as with sp_Trans_Try, there can only be one error in any transaction.

The Component Inspector panel allows you to work with the XMLConnector in more detail. If you can t see the panel on the right, choose Window Component Inspector. This panel contains three tabs: Parameters, Bindings, and Schema. You ve already configured the parameters for the component. Click the Schema tab. The Schema tab allows you to build a schema describing the structure of your XML document. You can also infer a schema from an external XML document. You can do this for the params property (data sent out of Flash) or for the results property (data received from external sources). I ll infer a schema from the dvd.xml file. Select the results property in the Schema tab and click the Import a schema button, as shown in Figure 10-9.

After you opened the connection, you created a transaction. Note that transactions are connection specific. You can t create a second transaction for the same connection before committing or rolling back the first one. Though the BeginTransaction method begins a transaction, the transaction itself performs no work until the first SQL is executed by a command.

' Open connection conn.Open() ' Begin transaction Dim sqltrans As SqlTransaction = conn.BeginTransaction()

Figure 10-9. Inferring a schema Navigate to the dvd.xml document and click Open. The Schema tab populates with a structure inferred from the document. Figure 10-10 shows the appearance at this point.

s BeginTransaction() is overloaded. You can give a transaction a name and specify its isolation level Tip (see the next section, Suggestions for Further Study ). We don t need either here, and you may not need them often.

and execute another dir command to be sure the compiler created the LunchCounter.mx image file (see Figure 3-35).

You need to trigger the data component before it loads the XML document. You can do this by adding the following line to Frame 1 of the actions layer: dvd_xc.trigger(); If you test the Flash movie at this point, nothing will happen because the data has not yet been bound to the UI components.

You created separate commands for the INSERT and DELETE statements and associated them with the same transaction by setting their Transaction property to the same transaction, sqltrans.

' Create insert command Dim cmdins As SqlCommand = conn.CreateCommand() cmdins.CommandText = sqlins cmdins.Transaction = sqltrans cmdins.Parameters.Add("@newcustid", SqlDbType.NVarChar, 5) cmdins.Parameters.Add("@newconame", SqlDbType.NVarChar, 30) ' Create delete command Dim cmddel As SqlCommand = conn.CreateCommand() cmddel.CommandText = sqldel cmddel.Transaction = sqltrans cmddel.Parameters.Add("@oldcustid", SqlDbType.NVarChar, 5)

You can configure the data bindings for the XMLConnector component within the Bindings tab of the Component Inspector panel. Select the XMLConnector component on the Stage, and click the Bindings tab. It will initially appear empty. You can add a binding by clicking the Add Binding button. It looks like a blue plus sign. When you click this button, you ll be prompted for the source of the binding. Because I want to display details of each DVD in the list, I need to select the DVD : Array option, as shown in Figure 10-11. When you ve done this, click OK.

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