微软企业库中的事务处理

public bool Transfer( int transactionAmount, int sourceAccount, int destinationAccount)
{
bool result = false ;

// CreatetheDatabaseobject,usingthedefaultdatabaseservice.The
// defaultdatabaseserviceisdeterminedthroughconfiguration.
Databasedb = DatabaseFactory.CreateDatabase();

// Twooperations,onetocreditanaccount,andonetodebitanother
// account.
string sqlCommand = " CreditAccount " ;
DBCommandWrappercreditCommandWrapper = db.GetStoredProcCommandWrapper(sqlCommand);

creditCommandWrapper.AddInParameter( " @AccountID " ,DbType.Int32,sourceAccount);
creditCommandWrapper.AddInParameter( " @Amount " ,DbType.Int32,transactionAmount);

sqlCommand = " DebitAccount " ;
DBCommandWrapperdebitCommandWrapper = db.GetStoredProcCommandWrapper(sqlCommand);

debitCommandWrapper.AddInParameter( " @AccountID " ,DbType.Int32,destinationAccount);
debitCommandWrapper.AddInParameter( " @Amount " ,DbType.Int32,transactionAmount);

using (IDbConnectionconnection = db.GetConnection())
{
connection.Open();
IDbTransactiontransaction = connection.BeginTransaction();

try
{
// Creditthefirstaccount
db.ExecuteNonQuery(creditCommandWrapper,transaction);
// Debitthesecondaccount
db.ExecuteNonQuery(debitCommandWrapper,transaction);

// Committhetransaction
transaction.Commit();

result = true ;
}
catch
{
// Rollbacktransaction
transaction.Rollback();
}
connection.Close();

return result;
}

在这段例子代码中，其核心就是关于 IDbTransaction的使用。