OdbcTransaction 类

定义

表示要在数据源进行的 SQL 事务。Represents an SQL transaction to be made at a data source. 此类不能被继承。This class cannot be inherited.

public ref class OdbcTransaction sealed : System::Data::Common::DbTransaction
public ref class OdbcTransaction sealed : MarshalByRefObject, IDisposable, System::Data::IDbTransaction
public sealed class OdbcTransaction : System.Data.Common.DbTransaction
public sealed class OdbcTransaction : MarshalByRefObject, IDisposable, System.Data.IDbTransaction
type OdbcTransaction = class
    inherit DbTransaction
type OdbcTransaction = class
    inherit MarshalByRefObject
    interface IDbTransaction
    interface IDisposable
Public NotInheritable Class OdbcTransaction
Inherits DbTransaction
Public NotInheritable Class OdbcTransaction
Inherits MarshalByRefObject
Implements IDbTransaction, IDisposable
继承
OdbcTransaction
继承
继承
OdbcTransaction
实现

示例

下面的示例创建一个 OdbcConnection 和一个 OdbcTransactionThe following example creates an OdbcConnection and an OdbcTransaction. 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 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

应用程序 OdbcTransaction 通过对对象调用来创建对象 BeginTransaction OdbcConnectionThe application creates an OdbcTransaction object by calling BeginTransaction on the OdbcConnection object. 与事务关联的所有后续操作 (例如,提交或中止事务) 在对象上执行 OdbcTransactionAll subsequent operations associated with the transaction (for example, committing or aborting the transaction) are performed on the OdbcTransaction object.

属性

Connection

获取与该事务关联的 OdbcConnection 对象,或者如果该事务不再有效,则为 nullGets the OdbcConnection object associated with the transaction, or null if the transaction is no longer valid.

DbConnection

在派生类中重写时,获取与事务关联的 DbConnection 对象。When overridden in a derived class, gets the DbConnection object associated with the transaction.

(继承自 DbTransaction)
IsolationLevel

为该事务指定 IsolationLevelSpecifies the IsolationLevel for this transaction.

SupportsSavepoints

获取一个值,该值指示此 DbTransaction 实例是否支持数据库保存点。Gets a value that indicates whether this DbTransaction instance supports database savepoints. 如果为 false,则 SaveAsync(String, CancellationToken)RollbackAsync(String, CancellationToken)ReleaseAsync(String, CancellationToken) 方法及其同步对应项应引发 NotSupportedExceptionIf false, the methods SaveAsync(String, CancellationToken), RollbackAsync(String, CancellationToken) and ReleaseAsync(String, CancellationToken) as well as their synchronous counterparts are expected to throw NotSupportedException.

(继承自 DbTransaction)

方法

Commit()

提交数据库事务。Commits the database transaction.

CommitAsync(CancellationToken)

异步提交数据库事务。Asynchronously commits the database transaction.

(继承自 DbTransaction)
CreateObjRef(Type)

创建一个对象,该对象包含生成用于与远程对象进行通信的代理所需的全部相关信息。Creates an object that contains all the relevant information required to generate a proxy used to communicate with a remote object.

(继承自 MarshalByRefObject)
Dispose()

释放 DbTransaction 使用的非托管资源。Releases the unmanaged resources used by the DbTransaction.

(继承自 DbTransaction)
Dispose(Boolean)

释放由 DbTransaction 占用的非托管资源,还可以另外再释放托管资源。Releases the unmanaged resources used by the DbTransaction and optionally releases the managed resources.

(继承自 DbTransaction)
DisposeAsync()

异步处置事务对象。Asynchronously diposes the transaction object.

(继承自 DbTransaction)
Equals(Object)

确定指定对象是否等于当前对象。Determines whether the specified object is equal to the current object.

(继承自 Object)
GetHashCode()

作为默认哈希函数。Serves as the default hash function.

(继承自 Object)
GetLifetimeService()
已过时。

检索控制此实例的生存期策略的当前生存期服务对象。Retrieves the current lifetime service object that controls the lifetime policy for this instance.

(继承自 MarshalByRefObject)
GetType()

获取当前实例的 TypeGets the Type of the current instance.

(继承自 Object)
InitializeLifetimeService()
已过时。

获取生存期服务对象来控制此实例的生存期策略。Obtains a lifetime service object to control the lifetime policy for this instance.

(继承自 MarshalByRefObject)
MemberwiseClone()

创建当前 Object 的浅表副本。Creates a shallow copy of the current Object.

(继承自 Object)
MemberwiseClone(Boolean)

创建当前 MarshalByRefObject 对象的浅表副本。Creates a shallow copy of the current MarshalByRefObject object.

(继承自 MarshalByRefObject)
Release(String)

销毁先前在当前事务中定义的保存点。Destroys a savepoint previously defined in the current transaction. 这允许系统在事务结束之前回收一些资源。This allows the system to reclaim some resources before the transaction ends.

(继承自 DbTransaction)
ReleaseAsync(String, CancellationToken)

销毁先前在当前事务中定义的保存点。Destroys a savepoint previously defined in the current transaction. 这允许系统在事务结束之前回收一些资源。This allows the system to reclaim some resources before the transaction ends.

(继承自 DbTransaction)
Rollback()

从挂起状态回滚事务。Rolls back a transaction from a pending state.

Rollback(String)

回滚在建立指定保存点后执行的所有命令。Rolls back all commands that were executed after the specified savepoint was established.

(继承自 DbTransaction)
RollbackAsync(CancellationToken)

从挂起状态异步回滚事务。Asynchronously rolls back a transaction from a pending state.

(继承自 DbTransaction)
RollbackAsync(String, CancellationToken)

回滚在建立指定保存点后执行的所有命令。Rolls back all commands that were executed after the specified savepoint was established.

(继承自 DbTransaction)
Save(String)

在事务中创建保存点。Creates a savepoint in the transaction. 这样,在建立保存点后执行的所有命令都将被回滚,并将事务状态还原到保存点时的状态。This allows all commands that are executed after the savepoint was established to be rolled back, restoring the transaction state to what it was at the time of the savepoint.

(继承自 DbTransaction)
SaveAsync(String, CancellationToken)

在事务中创建保存点。Creates a savepoint in the transaction. 这样,在建立保存点后执行的所有命令都将被回滚,并将事务状态还原到保存点时的状态。This allows all commands that are executed after the savepoint was established to be rolled back, restoring the transaction state to what it was at the time of the savepoint.

(继承自 DbTransaction)
ToString()

返回表示当前对象的字符串。Returns a string that represents the current object.

(继承自 Object)

显式接口实现

IDbTransaction.Connection

获取与事务关联的 DbConnection 对象,或空引用(如果该事务不再有效)。Gets the DbConnection object associated with the transaction, or a null reference if the transaction is no longer valid.

(继承自 DbTransaction)
IDisposable.Dispose()

此 API 支持产品基础结构,不能在代码中直接使用。

释放 OdbcTransaction 类的当前实例使用的资源。Releases the resources used by the current instance of the OdbcTransaction class.

适用于

另请参阅