OleDbConnection.BeginTransaction OleDbConnection.BeginTransaction OleDbConnection.BeginTransaction OleDbConnection.BeginTransaction Method

定义

开始数据库事务。Starts a database transaction.

重载

BeginTransaction() BeginTransaction() BeginTransaction() BeginTransaction()

以当前的 IsolationLevel 值开始数据库事务。Starts a database transaction with the current IsolationLevel value.

BeginTransaction(IsolationLevel) BeginTransaction(IsolationLevel) BeginTransaction(IsolationLevel)

以指定的隔离级别启动数据库事务。Starts a database transaction with the specified isolation level.

BeginTransaction() BeginTransaction() BeginTransaction() BeginTransaction()

以当前的 IsolationLevel 值开始数据库事务。Starts a database transaction with the current IsolationLevel value.

public:
 System::Data::OleDb::OleDbTransaction ^ BeginTransaction();
public System.Data.OleDb.OleDbTransaction BeginTransaction ();
override this.BeginTransaction : unit -> System.Data.OleDb.OleDbTransaction
Public Function BeginTransaction () As OleDbTransaction

返回

表示新事务的对象。An object representing the new transaction.

异常

不支持并行事务。Parallel transactions are not supported.

示例

下面的示例创建一个OleDbConnection和一个OleDbTransactionThe following example creates an OleDbConnection and an OleDbTransaction. 它还演示了如何使用BeginTransactionCommitRollback方法。It also demonstrates how to use the BeginTransaction, Commit, and Rollback methods.

public void ExecuteTransaction(string connectionString)
{
    using (OleDbConnection connection =
               new OleDbConnection(connectionString))
    {
        OleDbCommand command = new OleDbCommand();
        OleDbTransaction transaction = null;

        // Set the Connection to the new OleDbConnection.
        command.Connection = connection;

        // Open the connection and execute the transaction.
        try
        {
            connection.Open();

            // Start a local transaction with ReadCommitted isolation level.
            transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted);

            // Assign transaction object for a pending local transaction.
            command.Connection = connection;
            command.Transaction = transaction;

            // Execute the commands.
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
            command.ExecuteNonQuery();
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
            command.ExecuteNonQuery();

            // Commit the transaction.
            transaction.Commit();
            Console.WriteLine("Both records are written to database.");
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            try
            {
                // Attempt to roll back the transaction.
                transaction.Rollback();
            }
            catch
            {
                // Do nothing here; transaction is not active.
            }
        }
        // The connection is automatically closed when the
        // code exits the using block.
    }
}
Public Sub ExecuteTransaction(ByVal connectionString As String)

    Using connection As New OleDbConnection(connectionString)
        Dim command As New OleDbCommand()
        Dim transaction As OleDbTransaction

        ' Set the Connection to the new OleDbConnection.
        command.Connection = connection

        ' Open the connection and execute the transaction.
        Try
            connection.Open()

            ' Start a local transaction with ReadCommitted isolation level.
            transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)

            ' Assign transaction object for a pending local transaction.
            command.Connection = connection
            command.Transaction = transaction

            ' Execute the commands.
            command.CommandText = _
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')"
            command.ExecuteNonQuery()
            command.CommandText = _
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')"
            command.ExecuteNonQuery()

            ' Commit the transaction.
            transaction.Commit()
            Console.WriteLine("Both records are written to database.")

        Catch ex As Exception
            Console.WriteLine(ex.Message)
            ' Try to rollback the transaction
            Try
                    transaction.Rollback()

            Catch
                ' Do nothing here; transaction is not active.
            End Try
        End Try
        ' The connection is automatically closed when the
        ' code exits the Using block.
    End Using
End Sub

注解

必须使用CommitRollback方法显式提交或回滚事务。You must explicitly commit or roll back the transaction using the Commit or Rollback method. 为了确保 OLE DB 事务管理模型的 .NET Framework 数据提供程序正确执行,请避免使用其他事务管理模型,如数据源提供的模型。To make sure that the .NET Framework Data Provider for OLE DB transaction management model performs correctly, avoid using other transaction management models, such as those provided by the data source.

另请参阅

BeginTransaction(IsolationLevel) BeginTransaction(IsolationLevel) BeginTransaction(IsolationLevel)

以指定的隔离级别启动数据库事务。Starts a database transaction with the specified isolation level.

public:
 System::Data::OleDb::OleDbTransaction ^ BeginTransaction(System::Data::IsolationLevel isolationLevel);
public System.Data.OleDb.OleDbTransaction BeginTransaction (System.Data.IsolationLevel isolationLevel);
override this.BeginTransaction : System.Data.IsolationLevel -> System.Data.OleDb.OleDbTransaction

参数

isolationLevel
IsolationLevel IsolationLevel IsolationLevel IsolationLevel

事务应在其下运行的隔离级别。The isolation level under which the transaction should run.

返回

表示新事务的对象。An object representing the new transaction.

异常

不支持并行事务。Parallel transactions are not supported.

示例

下面的示例创建一个OleDbConnection和一个OleDbTransactionThe following example creates an OleDbConnection and an OleDbTransaction. 它还演示了如何使用BeginTransaction Commit、、和Rollback方法。It also demonstrates how to use the BeginTransaction, a Commit, and Rollback methods.

public void ExecuteTransaction(string connectionString)
{
    using (OleDbConnection connection =
               new OleDbConnection(connectionString))
    {
        OleDbCommand command = new OleDbCommand();
        OleDbTransaction transaction = null;

        // Set the Connection to the new OleDbConnection.
        command.Connection = connection;

        // Open the connection and execute the transaction.
        try
        {
            connection.Open();

            // Start a local transaction
            transaction = connection.BeginTransaction();

            // Assign transaction object for a pending local transaction.
            command.Connection = connection;
            command.Transaction = transaction;

            // Execute the commands.
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
            command.ExecuteNonQuery();
            command.CommandText =
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
            command.ExecuteNonQuery();

            // Commit the transaction.
            transaction.Commit();
            Console.WriteLine("Both records are written to database.");
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
            try
            {
                // Attempt to roll back the transaction.
                transaction.Rollback();
            }
            catch
            {
                // Do nothing here; transaction is not active.
            }
        }
        // The connection is automatically closed when the
        // code exits the using block.
    }
}
Public Sub ExecuteTransaction(ByVal connectionString As String)

    Using connection As New OleDbConnection(connectionString)
        Dim command As New OleDbCommand()
        Dim transaction As OleDbTransaction

        ' Set the Connection to the new OleDbConnection.
        command.Connection = connection

        ' Open the connection and execute the transaction.
        Try
            connection.Open()

            ' Start a local transaction.
            transaction = connection.BeginTransaction()

            ' Assign transaction object for a pending local transaction.
            command.Connection = connection
            command.Transaction = transaction

            ' Execute the commands.
            command.CommandText = _
                "Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')"
            command.ExecuteNonQuery()
            command.CommandText = _
                "Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')"
            command.ExecuteNonQuery()

            ' Commit the transaction.
            transaction.Commit()
            Console.WriteLine("Both records are written to database.")

        Catch ex As Exception
            Console.WriteLine(ex.Message)
            ' Try to rollback the transaction
            Try
                    transaction.Rollback()

            Catch
                ' Do nothing here; transaction is not active.
            End Try
        End Try
        ' The connection is automatically closed when the
        ' code exits the Using block.
    End Using
End Sub

注解

必须使用CommitRollback方法显式提交或回滚事务。You must explicitly commit or roll back the transaction using the Commit or Rollback method. 为了确保 OLE DB 事务管理模型的 .NET Framework 数据提供程序正确执行,请避免使用其他事务管理模型,如数据源提供的模型。To make sure that the .NET Framework Data Provider for OLE DB transaction management model performs correctly, avoid using other transaction management models, such as those provided by the data source.

备注

如果未指定隔离级别,将使用基础提供程序的默认隔离级别。If you do not specify an isolation level, the default isolation level for the underlying provider is used. 若要使用BeginTransaction方法指定隔离级别,请使用isolationLevel采用参数的重载。To specify an isolation level with the BeginTransaction method, use the overload that takes the isolationLevel parameter.

另请参阅

适用于