SqlTransaction的解析

SqlTransaction的解析

2011-10-10 19:48 2757人阅读 评论(1) 收藏 举报

exceptionsql serverinsertcommandobjectstring

SqlTransaction类表示要在SQL Server数据库中处理的Transact-SQL事务。无法继承此类

应用程序通过在SqlConnection 对象上调用BeginTransaction 来创建 SqlTransaction 对象。对SqlTransaction 对象执行与该事务关联的所有后续操作（例如提交或中止该事务）。

注意：在提交或回滚 SqlTransaction 时，应始终使用 Try/Catch 进行异常处理。如果连接终止或事务已在服务器上回滚，则Commit  和Rollback 都会生成

InvalidOperationException

示例：

下面的示例创建一个 SqlConnection 和一个 SqlTransaction。此示例演示如何使用BeginTransaction、Commit 和 Rollback 等方法。出现任何错误时事务都会回滚。Try/Catch 错误处理用于处理尝试提交或回滚事务时的所有错误。

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();

}

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);

}

}

}

}