我问自己是否可以在 ADO.NET 中检查当前事务是否可以回滚。
msdn 建议以下实现:
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);
}
}
}
}
另外还有一点需要注意:回滚事务时应始终使用 Try/Catch 异常处理。如果连接终止或事务已在服务器上回滚,则回滚会生成 InvalidOperationException。
但我真的不敢相信 try/catch 是检查是否可以回滚的推荐解决方案。
我知道在 SQL Server 实现中,如果事务是“僵尸”,则 SQLTransaction 对象在 Connection 属性上返回 null。
但这是非常具体的实现,它只适用于 SQL Server。
那么是否有一种独立于数据库的方法来检测事务是否可以回滚?
蒂亚·马丁