微软企业库中的事务处理

public bool Transfer(int transactionAmount, int sourceAccount, int destinationAccount)
        {
            bool result = false;
            
            // Create the Database object, using the default database service. The
            // default database service is determined through configuration.
            Database db = DatabaseFactory.CreateDatabase();

            // Two operations, one to credit an account, and one to debit another
            // account.
            string sqlCommand = "CreditAccount";
            DBCommandWrapper creditCommandWrapper = db.GetStoredProcCommandWrapper(sqlCommand);

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

            sqlCommand = "DebitAccount";
            DBCommandWrapper debitCommandWrapper = db.GetStoredProcCommandWrapper(sqlCommand);

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

            using (IDbConnection connection = db.GetConnection())
            {
                connection.Open();
                IDbTransaction transaction = connection.BeginTransaction();

                try
                {
                    // Credit the first account
                    db.ExecuteNonQuery(creditCommandWrapper, transaction);
                    // Debit the second account
                    db.ExecuteNonQuery(debitCommandWrapper, transaction);

                    // Commit the transaction
                    transaction.Commit();
                    
                    result = true;
                }
                catch
                {
                    // Rollback transaction 
                    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。

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自企业库2.0以后，存储过程的command方式有所改变，自至5.0为止都是如下写法

        Database DataBase = default(Database);
        DbCommand dbCommand = DataBase.GetStoredProcCommand("MCS_GET_SEQUENCE");
        DataBase.AddInParameter(dbCommand, "I_TABLE_NAME", DbType.String, strTable);
        DataBase.AddOutParameter(dbCommand, "O_CUR_SEQUENCE", DbType.Int16,10);
        DataBase.ExecuteNonQuery(dbCommand);
        strSeqNo = Convert.ToInt16(DataBase.GetParameterValue(dbCommand, "O_CUR_SEQUENCE"));

using connection的写法也变，新版本为

using (IDbConnection connection = db.CreateConnection())