DB2 Connection.BeginTransaction( IsolationLevel ) 方法

语法

[Visual Basic]
Overloads Public Function BeginTransaction( _
   ByVal isolevel As IsolationLevel _
) As DB2Transaction

[C#]
public DB2Transaction
 BeginTransaction(
   IsolationLevel isolevel
);
[C++]
public: DB2Transaction
* BeginTransaction(
   IsolationLevel isolevel
);
[JScript]
public function BeginTransaction(
   isolevel : IsolationLevel
) : DB2Transaction
;

参数

isolevel

此连接的事务隔离级别。 若未指定隔离级别，则使用 IBM®.NET数据服务器提供程序的默认隔离级别。

返回值

用来表示新事务的对象。

异常

备注

要提交或回滚事务，必须显式调用 Transaction.Commit DB2®Transaction.Commit 或 DB2 Transaction.Rollback 方法。

示例

[Visual Basic, C#] 以下示例创建一个 DB2 连接和一个 DB2 事务。 它还演示了如何使用 BeginTransaction, DB2事务提交, 和 DB2事务回滚 方法。

[Visual Basic]
Public Sub RunDB2Transaction(myConnString As String)
    Dim myConnection As New DB2Connection(myConnString)
    myConnection.Open()

    Dim myCommand As New DB2Command()
    Dim myTrans As DB2Transaction

    ' Start a local transaction
    myTrans = myConnection.BeginTransaction(IsolationLevel.ReadCommitted)
    ' Assign transaction object for a pending local transaction
    myCommand.Transaction = myTrans

    Try
        myCommand.CommandText = "Insert into STAFF (ID, NAME) VALUES (...)"
        myCommand.ExecuteNonQuery()
        myCommand.CommandText = "Insert into STAFF (ID, NAME) VALUES (...)"
        myCommand.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
        myConnection.Close()
    End Try
End Sub

[C#]
public void RunDB2Transaction(string myConnString)
{
   DB2Connection myConnection = new DB2Connection(myConnString);
   myConnection.Open();

   DB2Command myCommand = new DB2Command();
   DB2Transaction myTrans;

   // Start a local transaction
   myTrans = myConnection.BeginTransaction(IsolationLevel.ReadCommitted);
   // Assign transaction object for a pending local transaction
   myCommand.Transaction = myTrans;

   try
   {
     myCommand.CommandText = "Insert into STAFF (ID, NAME) VALUES (...)";
     myCommand.ExecuteNonQuery();
     myCommand.CommandText = "Insert into STAFF (ID, NAME) VALUES (...)";
     myCommand.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
   {
     myConnection.Close();
   }
}