OdbcConnection.BeginTransaction 方法

定义

命名空间:

System.Data.Odbc

程序集:

System.Data.Odbc.dll

包:

System.Data.Odbc v8.0.0

在数据源中开始事务。

重载

BeginTransaction()	在数据源中开始事务。
BeginTransaction(IsolationLevel)	在数据源中用指定的 IsolationLevel 值开始事务。

BeginTransaction()

Source:

OdbcConnection.cs

在数据源中开始事务。

public:
 System::Data::Odbc::OdbcTransaction ^ BeginTransaction();

public System.Data.Odbc.OdbcTransaction BeginTransaction ();

override this.BeginTransaction : unit -> System.Data.Odbc.OdbcTransaction

Public Function BeginTransaction () As OdbcTransaction

返回

OdbcTransaction

表示新事务的对象。

例外

InvalidOperationException

事务当前是活动的。 不支持并行事务。

示例

以下示例创建 OdbcConnection 和 OdbcTransaction。 它还演示如何使用 BeginTransaction、 Commit和 Rollback 方法。

public static void ExecuteTransaction(string connectionString)
{
    using (OdbcConnection connection =
               new OdbcConnection(connectionString))
    {
        OdbcCommand command = new OdbcCommand();
        OdbcTransaction transaction = null;

        // Set the Connection to the new OdbcConnection.
        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 OdbcConnection(connectionString)
        Dim command As New OdbcCommand()
        Dim transaction As OdbcTransaction

        ' Set the Connection to the new OdbcConnection.
        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

若要提交或回滚事务，必须显式使用 Commit 或 Rollback 方法。

若要确保 .NET Framework ODBC 事务管理模型的数据提供程序正确执行，请避免使用其他事务管理模型，例如数据源提供的模型。

注意

如果未指定隔离级别，隔离级别将由正在使用的驱动程序确定。 若要使用 BeginTransaction 方法指定隔离级别，请使用采用 参数的 isolevel 重载。

另请参阅

• 连接到数据源

BeginTransaction(IsolationLevel)

Source:

OdbcConnection.cs

在数据源中用指定的 IsolationLevel 值开始事务。

public:
 System::Data::Odbc::OdbcTransaction ^ BeginTransaction(System::Data::IsolationLevel isolevel);

public System.Data.Odbc.OdbcTransaction BeginTransaction (System.Data.IsolationLevel isolevel);

override this.BeginTransaction : System.Data.IsolationLevel -> System.Data.Odbc.OdbcTransaction

Public Function BeginTransaction (isolevel As IsolationLevel) As OdbcTransaction

参数

isolevel

IsolationLevel

该连接的事务隔离级别。 若未指定隔离级别，将使用驱动程序的默认隔离级别。

返回

OdbcTransaction

表示新事务的对象。

例外

InvalidOperationException

事务当前是活动的。 不支持并行事务。

示例

以下示例创建 OdbcConnection 和 OdbcTransaction。 它还演示如何使用 BeginTransaction、 Commit和 Rollback 方法。

public static void ExecuteTransaction(string connectionString)
{
    using (OdbcConnection connection =
               new OdbcConnection(connectionString))
    {
        OdbcCommand command = new OdbcCommand();
        OdbcTransaction transaction = null;

        // Set the Connection to the new OdbcConnection.
        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 OdbcConnection(connectionString)
        Dim command As New OdbcCommand()
        Dim transaction As OdbcTransaction

        ' Set the Connection to the new OdbcConnection.
        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

若要提交或回滚事务，必须显式使用 Commit 或 Rollback 方法。

若要确保 .NET Framework ODBC 事务管理模型的数据提供程序正确执行，请避免使用其他事务管理模型，例如数据源提供的模型。

另请参阅

• 连接到数据源