DbConnection.EnlistTransaction有什么作用? [英] What does DbConnection.EnlistTransaction do?

问题描述

DbConnection.EnlistTransaction有什么作用?

What does DbConnection.EnlistTransaction do?

推荐答案

DbConnection.EnlistTransaction 允许:

• 将连接加入 System.Transactions.交易 .它有一些限制:
  • 如果该连接已经在参与本地"网络，则为本地".交易( System.Data.Common.DbTransaction )，它可能会失败并出现异常.(这似乎取决于具体的连接实现:在这种情况下，Firebird 2不会引发异常，
  • Joining the connection to a System.Transactions.Transaction. It has some constraints:
    • If the connection is already participating in a "local" transaction (System.Data.Common.DbTransaction), it may fail with an exception. (This seems to depend on the concrete connection implementation: Firebird 2 does not throw an exception in such situation, SqlConnection and likely most others do throw.)
    • If the connection was already joined to another System.Transactions.Transaction, and this other transaction is still active, it will fail with an exception.

    DbConnection.EnlistTransaction 通常与 System.Transactions.Transaction.Current .如果在

    DbConnection.EnlistTransaction is usually used with System.Transactions.Transaction.Current. It is not required to use it if the connection is acquired (opened) within a TransactionScope: in such case, the connection automatically enlists itself in the current transaction (unless its connection string dictates otherwise with enlist=false). But once again, some connection implementations may differ here too: some do not have auto-enlistment enabled by default and have a quite different semantic for it (like FbConnection prior to its 6.0 version), or do use a different connection string parameter (like MySqlConnection which uses AutoEnlist).

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