SqlTransaction.Rollback 方法
定义
重要
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重载
Rollback() |
从挂起状态回滚事务。 |
Rollback(String) |
从挂起状态回滚事务,并指定事务或保存点名称。 |
Rollback()
从挂起状态回滚事务。
public:
override void Rollback();
public override void Rollback ();
override this.Rollback : unit -> unit
Public Overrides Sub Rollback ()
例外
在尝试提交事务时出错。
示例
以下示例创建 SqlConnection 和 SqlTransaction。 它还演示如何使用 BeginTransaction、 Commit和 Rollback 方法。 发生任何错误时,事务将回滚。 Try
/Catch
错误处理用于在尝试提交或回滚事务时处理任何错误。
using Microsoft.Data.SqlClient;
namespace Transaction1CS
{
class Program
{
static void Main()
{
string connectionString =
"Persist Security Info=False;Integrated Security=SSPI;database=Northwind;server=(local)";
ExecuteSqlTransaction(connectionString);
Console.ReadLine();
}
private static void ExecuteSqlTransaction(string connectionString)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
SqlCommand command = connection.CreateCommand();
SqlTransaction transaction;
// Start a local transaction.
transaction = connection.BeginTransaction();
// Must assign both transaction object and connection
// to Command object for a pending local transaction
command.Connection = connection;
command.Transaction = transaction;
try
{
command.CommandText =
"Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
command.ExecuteNonQuery();
command.CommandText =
"Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
command.ExecuteNonQuery();
// Attempt to commit the transaction.
transaction.Commit();
Console.WriteLine("Both records are written to database.");
}
catch (Exception ex)
{
Console.WriteLine("Commit Exception Type: {0}", ex.GetType());
Console.WriteLine(" Message: {0}", ex.Message);
// Attempt to roll back the transaction.
try
{
transaction.Rollback();
}
catch (Exception ex2)
{
// This catch block will handle any errors that may have occurred
// on the server that would cause the rollback to fail, such as
// a closed connection.
Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType());
Console.WriteLine(" Message: {0}", ex2.Message);
}
}
}
}
}
}
注解
方法 Rollback 等效于 Transact-SQL ROLLBACK TRANSACTION 语句。 有关详细信息,请参阅 ROLLBACK TRANSACTION (Transact-SQL) 。
事务只能从挂起状态回滚, (调用 之后 BeginTransaction ,但在调用) 之前 Commit 。 事务在被释放之前或Rollback
被调用时Commit
回滚。
注意
Try
/Catch
回滚事务时,应始终使用异常处理。 Rollback
如果连接终止或事务已在服务器上回滚,则会生成 InvalidOperationException 。
有关SQL Server事务的详细信息,请参阅事务 (Transact-SQL) 。
适用于
Rollback(String)
从挂起状态回滚事务,并指定事务或保存点名称。
public:
void Rollback(System::String ^ transactionName);
public:
override void Rollback(System::String ^ transactionName);
public void Rollback (string transactionName);
public override void Rollback (string transactionName);
override this.Rollback : string -> unit
Public Sub Rollback (transactionName As String)
Public Overrides Sub Rollback (transactionName As String)
参数
- transactionName
- String
要回滚的事务的名称,或要回滚到的保存点的名称。
例外
未指定事务名称。
示例
以下示例创建 SqlConnection 和 SqlTransaction。 它还演示如何使用 BeginTransaction、 Commit和 Rollback 方法。 发生任何错误时,事务将回滚。 Try
/Catch
错误处理用于在尝试提交或回滚事务时处理任何错误。
using Microsoft.Data.SqlClient;
namespace Transaction1CS
{
class Program
{
static void Main()
{
string connectionString =
"Persist Security Info=False;Integrated Security=SSPI;database=Northwind;server=(local)";
ExecuteSqlTransaction(connectionString);
Console.ReadLine();
}
private static void ExecuteSqlTransaction(string connectionString)
{
using (SqlConnection connection = new SqlConnection(connectionString))
{
connection.Open();
SqlCommand command = connection.CreateCommand();
SqlTransaction transaction;
// Start a local transaction.
transaction = connection.BeginTransaction("SampleTransaction");
// Must assign both transaction object and connection
// to Command object for a pending local transaction
command.Connection = connection;
command.Transaction = transaction;
try
{
command.CommandText =
"Insert into Region (RegionID, RegionDescription) VALUES (100, 'Description')";
command.ExecuteNonQuery();
command.CommandText =
"Insert into Region (RegionID, RegionDescription) VALUES (101, 'Description')";
command.ExecuteNonQuery();
// Attempt to commit the transaction.
transaction.Commit();
Console.WriteLine("Both records are written to database.");
}
catch (Exception ex)
{
Console.WriteLine("Commit Exception Type: {0}", ex.GetType());
Console.WriteLine(" Message: {0}", ex.Message);
// Attempt to roll back the transaction.
try
{
transaction.Rollback("SampleTransaction");
}
catch (Exception ex2)
{
// This catch block will handle any errors that may have occurred
// on the server that would cause the rollback to fail, such as
// a closed connection.
Console.WriteLine("Rollback Exception Type: {0}", ex2.GetType());
Console.WriteLine(" Message: {0}", ex2.Message);
}
}
}
}
}
}
注解
方法 Rollback 等效于 Transact-SQL ROLLBACK TRANSACTION 语句。 有关详细信息,请参阅 事务 (Transact-SQL) 。
事务只能从挂起状态回滚, (调用 之后 BeginTransaction ,但在调用) 之前 Commit 。 如果在或调用之前Commit
Rollback
释放事务,则会回滚该事务。
注意
Try
/Catch
回滚事务时,应始终使用异常处理。 Rollback
如果连接终止或事务已在服务器上回滚,则会生成 InvalidOperationException 。
有关SQL Server事务的详细信息,请参阅事务 (Transact-SQL) 。