SqlConnection.BeginTransaction 方法
定义
重要
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开始数据库事务。
重载
BeginTransaction() |
开始数据库事务。 |
BeginTransaction(IsolationLevel) |
以指定的隔离级别启动数据库事务。 |
BeginTransaction(String) |
以指定的事务名称启动数据库事务。 |
BeginTransaction(IsolationLevel, String) |
以指定的隔离级别和事务名称启动数据库事务。 |
BeginTransaction()
开始数据库事务。
public:
System::Data::SqlClient::SqlTransaction ^ BeginTransaction();
public System.Data.SqlClient.SqlTransaction BeginTransaction ();
override this.BeginTransaction : unit -> System.Data.SqlClient.SqlTransaction
member this.BeginTransaction : unit -> System.Data.SqlClient.SqlTransaction
Public Function BeginTransaction () As SqlTransaction
返回
表示新事务的对象。
例外
使用多个活动结果集 (MARS) 时,不允许并行事务。
不支持并行事务。
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。
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);
}
}
}
}
Private Sub ExecuteSqlTransaction(ByVal connectionString As String)
Using connection As New SqlConnection(connectionString)
connection.Open()
Dim command As SqlCommand = connection.CreateCommand()
Dim transaction As SqlTransaction
' 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 ex As Exception
Console.WriteLine("Commit Exception Type: {0}", ex.GetType())
Console.WriteLine(" Message: {0}", ex.Message)
' Attempt to roll back the transaction.
Try
transaction.Rollback()
Catch ex2 As Exception
' 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)
End Try
End Try
End Using
End Sub
注解
此命令映射到 BEGIN TRANSACTION 的SQL Server实现。
必须使用 或 Rollback 方法显式提交或回滚事务Commit。 若要确保SQL Server事务管理模型的.NET Framework数据提供程序正常运行,请避免使用其他事务管理模型,例如SQL Server提供的模型。
注意
如果未指定隔离级别,则使用默认隔离级别。 若要使用 BeginTransaction 方法指定隔离级别,请使用采用 iso
参数的重载 (BeginTransaction) 。 为事务设置的隔离级别在事务完成后一直保留,直到关闭或释放连接为止。 在未启用 快照 隔离级别的数据库中,将隔离级别设置为“快照”不会引发异常。 事务将使用默认隔离级别完成。
注意
如果事务已启动,并且服务器上发生 16 级或更高级别的错误,则在调用 方法之前不会回滚该 Read 事务。 ExecuteReader 上不会引发异常。
注意
当查询返回大量数据并调用 BeginTransaction
时,SqlException会引发 ,因为在使用 MARS 时,SQL Server不允许并行事务。 若要避免此问题,请在打开任何读取器之前,始终将事务与命令和/或连接相关联。
有关SQL Server事务的详细信息,请参阅事务 (Transact-SQL) 。
另请参阅
适用于
BeginTransaction(IsolationLevel)
以指定的隔离级别启动数据库事务。
public:
System::Data::SqlClient::SqlTransaction ^ BeginTransaction(System::Data::IsolationLevel iso);
public System.Data.SqlClient.SqlTransaction BeginTransaction (System.Data.IsolationLevel iso);
override this.BeginTransaction : System.Data.IsolationLevel -> System.Data.SqlClient.SqlTransaction
member this.BeginTransaction : System.Data.IsolationLevel -> System.Data.SqlClient.SqlTransaction
Public Function BeginTransaction (iso As IsolationLevel) As SqlTransaction
参数
- iso
- IsolationLevel
事务应在其下运行的隔离级别。
返回
表示新事务的对象。
例外
使用多个活动结果集 (MARS) 时,不允许并行事务。
不支持并行事务。
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。
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(IsolationLevel.ReadCommitted);
// 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();
transaction.Commit();
Console.WriteLine("Both records are written to database.");
}
catch (Exception e)
{
try
{
transaction.Rollback();
}
catch (SqlException ex)
{
if (transaction.Connection != null)
{
Console.WriteLine("An exception of type " + ex.GetType() +
" was encountered while attempting to roll back the transaction.");
}
}
Console.WriteLine("An exception of type " + e.GetType() +
" was encountered while inserting the data.");
Console.WriteLine("Neither record was written to database.");
}
}
}
Private Sub ExecuteSqlTransaction(ByVal connectionString As String)
Using connection As New SqlConnection(connectionString)
connection.Open()
Dim command As SqlCommand = connection.CreateCommand()
Dim transaction As SqlTransaction
' Start a local transaction
transaction = connection.BeginTransaction(IsolationLevel.ReadCommitted)
' 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()
transaction.Commit()
Console.WriteLine("Both records are written to database.")
Catch e As Exception
Try
transaction.Rollback()
Catch ex As SqlException
If Not transaction.Connection Is Nothing Then
Console.WriteLine("An exception of type " & ex.GetType().ToString() & _
" was encountered while attempting to roll back the transaction.")
End If
End Try
Console.WriteLine("An exception of type " & e.GetType().ToString() & _
"was encountered while inserting the data.")
Console.WriteLine("Neither record was written to database.")
End Try
End Using
End Sub
注解
此命令映射到 BEGIN TRANSACTION 的SQL Server实现。
必须使用 或 Rollback 方法显式提交或回滚事务Commit。 若要确保SQL Server事务管理模型的.NET Framework数据提供程序正常运行,请避免使用其他事务管理模型,例如SQL Server提供的模型。
注意
提交或回滚事务后,对于处于自动提交模式的所有后续命令,事务的隔离级别将保留 (SQL Server默认) 。 这会产生意外结果,例如,REPEATABLE READ 的隔离级别持久化和将其他用户锁定在一行之外。 若要将隔离级别重置为默认 (READ COMMITTED) ,请执行 Transact-SQL SET TRANSACTION ISOLATION LEVEL READ COMMITTED 语句,或立即SqlTransaction.Commit调用 SqlConnection.BeginTransaction 后跟 。 有关SQL Server隔离级别的详细信息,请参阅事务隔离级别。
有关SQL Server事务的详细信息,请参阅事务 (Transact-SQL) 。
注意
当查询返回大量数据并调用 BeginTransaction
时,SqlException会引发 ,因为在使用 MARS 时,SQL Server不允许并行事务。 若要避免此问题,请在打开任何读取器之前,始终将事务与命令和/或连接相关联。
另请参阅
适用于
BeginTransaction(String)
以指定的事务名称启动数据库事务。
public:
System::Data::SqlClient::SqlTransaction ^ BeginTransaction(System::String ^ transactionName);
public System.Data.SqlClient.SqlTransaction BeginTransaction (string transactionName);
override this.BeginTransaction : string -> System.Data.SqlClient.SqlTransaction
member this.BeginTransaction : string -> System.Data.SqlClient.SqlTransaction
Public Function BeginTransaction (transactionName As String) As SqlTransaction
参数
- transactionName
- String
事务的名称。
返回
表示新事务的对象。
例外
使用多个活动结果集 (MARS) 时,不允许并行事务。
不支持并行事务。
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。
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);
}
}
}
}
Private Sub ExecuteSqlTransaction(ByVal connectionString As String)
Using connection As New SqlConnection(connectionString)
connection.Open()
Dim command As SqlCommand = connection.CreateCommand()
Dim transaction As SqlTransaction
' 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 ex As Exception
Console.WriteLine("Exception Type: {0}", ex.GetType())
Console.WriteLine(" Message: {0}", ex.Message)
' Attempt to roll back the transaction.
Try
transaction.Rollback("SampleTransaction")
Catch ex2 As Exception
' 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)
End Try
End Try
End Using
End Sub
注解
此命令映射到 BEGIN TRANSACTION 的SQL Server实现。
参数的 transactionName
长度不能超过 32 个字符;否则将引发异常。
参数中的 transactionName
值可用于以后对 Rollback 和 方法的 参数的 savePoint
Save 调用。
必须使用 或 Rollback 方法显式提交或回滚事务Commit。 若要确保SQL Server事务管理模型的.NET Framework数据提供程序正常运行,请避免使用其他事务管理模型,例如SQL Server提供的模型。
有关SQL Server事务的详细信息,请参阅事务 (Transact-SQL) 。
注意
当查询返回大量数据并调用 BeginTransaction
时,SqlException会引发 ,因为在使用 MARS 时,SQL Server不允许并行事务。 若要避免此问题,请在打开任何读取器之前,始终将事务与命令和/或连接相关联。
另请参阅
适用于
BeginTransaction(IsolationLevel, String)
以指定的隔离级别和事务名称启动数据库事务。
public:
System::Data::SqlClient::SqlTransaction ^ BeginTransaction(System::Data::IsolationLevel iso, System::String ^ transactionName);
public System.Data.SqlClient.SqlTransaction BeginTransaction (System.Data.IsolationLevel iso, string transactionName);
override this.BeginTransaction : System.Data.IsolationLevel * string -> System.Data.SqlClient.SqlTransaction
member this.BeginTransaction : System.Data.IsolationLevel * string -> System.Data.SqlClient.SqlTransaction
Public Function BeginTransaction (iso As IsolationLevel, transactionName As String) As SqlTransaction
参数
- iso
- IsolationLevel
事务应在其下运行的隔离级别。
- transactionName
- String
事务的名称。
返回
表示新事务的对象。
例外
使用多个活动结果集 (MARS) 时,不允许并行事务。
不支持并行事务。
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。
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(
IsolationLevel.ReadCommitted, "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();
transaction.Commit();
Console.WriteLine("Both records are written to database.");
}
catch (Exception e)
{
try
{
transaction.Rollback("SampleTransaction");
}
catch (SqlException ex)
{
if (transaction.Connection != null)
{
Console.WriteLine("An exception of type " + ex.GetType() +
" was encountered while attempting to roll back the transaction.");
}
}
Console.WriteLine("An exception of type " + e.GetType() +
" was encountered while inserting the data.");
Console.WriteLine("Neither record was written to database.");
}
}
}
Private Sub ExecuteSqlTransaction(ByVal connectionString As String)
Using connection As New SqlConnection(connectionString)
connection.Open()
Dim command As SqlCommand = connection.CreateCommand()
Dim transaction As SqlTransaction
' Start a local transaction.
transaction = connection.BeginTransaction( _
IsolationLevel.ReadCommitted, "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()
transaction.Commit()
Console.WriteLine("Both records are written to database.")
Catch e As Exception
Try
transaction.Rollback("SampleTransaction")
Catch ex As SqlException
If Not transaction.Connection Is Nothing Then
Console.WriteLine("An exception of type " & ex.GetType().ToString() & _
" was encountered while attempting to roll back the transaction.")
End If
End Try
Console.WriteLine("An exception of type " & e.GetType().ToString() & _
"was encountered while inserting the data.")
Console.WriteLine("Neither record was written to database.")
End Try
End Using
End Sub
注解
此命令映射到 BEGIN TRANSACTION 的SQL Server实现。
参数中的 transactionName
值可用于以后对 Rollback 和 方法的 参数的 savePoint
Save 调用。
必须使用 或 Rollback 方法显式提交或回滚事务Commit。 若要确保SQL Server事务管理模型正常运行,请避免使用其他事务管理模型,例如SQL Server提供的事务管理模型。
注意
提交或回滚事务后,对于处于自动提交模式的所有后续命令,事务的隔离级别将保留 (SQL Server默认) 。 这会产生意外结果,例如,REPEATABLE READ 的隔离级别持久化和将其他用户锁定在一行之外。 若要将隔离级别重置为默认 (READ COMMITTED) ,请执行 Transact-SQL SET TRANSACTION ISOLATION LEVEL READ COMMITTED 语句,或立即SqlTransaction.Commit调用 SqlConnection.BeginTransaction 后跟 。 有关SQL Server隔离级别的详细信息,请参阅事务隔离级别。
有关SQL Server事务的详细信息,请参阅事务 (Transact-SQL) 。
注意
当查询返回大量数据并调用 BeginTransaction
时,SqlException会引发 ,因为在使用 MARS 时,SQL Server不允许并行事务。 若要避免此问题,请在打开任何读取器之前,始终将事务与命令和/或连接相关联。
另请参阅
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