sql-server - ZombieCheck 异常 - 此 SqlTransaction 已完成；它不再可用——在简单提交期间

Question

我有以下代码，用于将单行提交到数据库表(SQL 2008/.NET 4)

using (var db = new MyDbDataContext(_dbConnectionString))
{
    Action action = new Action();
    db.Actions.InsertOnSubmit(dbAction);
    db.SubmitChanges();
}

通常一切都很好，但偶尔我会遇到以下异常:

System.InvalidOperationException: This SqlTransaction has completed; it is no longer usable.
at System.Data.SqlClient.SqlTransaction.ZombieCheck()
at System.Data.SqlClient.SqlTransaction.Rollback()
at System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode)

SO上有很多类似的问题，但我读完后无法找出原因。

这是否仅仅是由于 SQL 超时(调用后接近 25 秒发生异常)？或者在这种情况下我应该期待 SQL 超时异常吗？

有谁知道还有什么可能导致这种情况吗？

Answer 1

DataContext.SubmitChanges方法的主体中有以下代码行:

// ...
try
{
    if (this.provider.Connection.State == ConnectionState.Open)
    {
        this.provider.ClearConnection();
    }
    if (this.provider.Connection.State == ConnectionState.Closed)
    {
        this.provider.Connection.Open();
        flag = true;
    }
    dbTransaction = this.provider.Connection.BeginTransaction(IsolationLevel.ReadCommitted);
    this.provider.Transaction = dbTransaction;
    new ChangeProcessor(this.services, this).SubmitChanges(failureMode);
    this.AcceptChanges();
    this.provider.ClearConnection();
    dbTransaction.Commit();
}
catch
{
    if (dbTransaction != null)
    {
        dbTransaction.Rollback();
    }
    throw;
}
// ...

当连接超时时，catch block 将被执行，并且 dbTransaction.Rollback();该行将抛出 InvalidOperationException .

如果您可以控制代码，则可以捕获如下异常:

catch
{
    // Attempt to roll back the transaction. 
    try
    {
        if (dbTransaction != null)
        {
            dbTransaction.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);
    }
    throw;
}