Rolls back a database transaction from a pending state.
The following example creates a
BigQueryConnection and a
BigQueryTransaction. It also demonstrates how to use the
BigQueryConnection.BeginTransaction,
Commit, and
Rollback methods.
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public void RunBigQueryTransaction(string myConnString)
{
BigQueryConnection bigQueryConnection = new BigQueryConnection(myConnString);
bigQueryConnection.Open();
BigQueryCommand bigQueryCommand = new BigQueryCommand();
BigQueryTransaction myTrans;
// Start a local transaction
myTrans = bigQueryConnection.BeginTransaction();
// Assign transaction object for a pending local transaction
bigQueryCommand.Transaction = myTrans;
try
{
bigQueryCommand.CommandText = "INSERT INTO Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')";
bigQueryCommand.ExecuteNonQuery();
bigQueryCommand.CommandText = "INSERT INTO Dept(DeptNo, DName) Values(60, 'PRODUCTION')";
bigQueryCommand.ExecuteNonQuery();
myTrans.Commit();
Console.WriteLine("Both records are written to database.");
}
catch(Exception e)
{
myTrans.Rollback();
Console.WriteLine(e.ToString());
Console.WriteLine("Neither record was written to database.");
}
finally
{
bigQueryConnection.Close();
}
} |
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Public Sub RunBigQueryTransaction(myConnString As String)
Dim bigQueryConnection As New BigQueryConnection(myConnString)
bigQueryConnection.Open()
Dim bigQueryCommand As New BigQueryCommand()
Dim myTrans As BigQueryTransaction
' Start a local transaction
myTrans = bigQueryConnection.BeginTransaction()
' Assign transaction object for a pending local transaction
bigQueryCommand.Transaction = myTrans
Try
bigQueryCommand.CommandText = "INSERT INTO Dept(DeptNo, DName) Values(50, 'DEVELOPMENT')"
bigQueryCommand.ExecuteNonQuery()
bigQueryCommand.CommandText = "INSERT INTO Dept(DeptNo, DName) Values(60, 'PRODUCTION')"
bigQueryCommand.ExecuteNonQuery()
myTrans.Commit()
Console.WriteLine("Both records are written to database.")
Catch e As Exception
myTrans.Rollback()
Console.WriteLine(e.ToString())
Console.WriteLine("Neither record was written to database.")
Finally
bigQueryConnection.Close()
End Try
End Sub |
