Transactions
Creating Transactions
By default ADO.NET connections do not have an active transaction. The transaction must be started explicitly using the connection's BeginTransaction method. This returns a DbTransaction object that controls the lifetime of the transaction.
Once the transaction has been created, all commands executed on the connection
must have their DbTransaction property set to that transaction object. Only
one transaction may be active on the connection at once and all commands must be
executed under that transaction.
DB2Connection connection; DB2rCommand cmd = new DB2Command(conn); // Thsi creates a new transaction and registers it with the command DbTransaction tran = conn.BeginTransaction(); cmd.DbTransaction = tran; // Both of these statements execute in the transaction cmd.CommandText = "INSERT INTO ExampleTable (ExampleCol) VALUES ('ExampleVal1')"; cmd.ExecuteNonQuery(); cmd.CommandText = "INSERT INTO ExampleTable (ExampleCol) VALUES ('ExampleVal2')"; cmd.ExecuteNonQuery(); // This ends the current transaction and unregisters it from the command tran.Commit(); cmd.DbTransaction = null;
Committing and Rolling Back Transactions
The transaction object is used to commit and rollback the transaction. The
transaction may be commtited using the transaction's Commit method. Committing
accepts all the changes in the transaction and persists them if they are
consistent:
tran.Commit();
The transaction may be rolled back using the transaction's Rollback method.
Rolling back undoes all changes performed in the transaction.
tran.Rollback();