Question

我确定这是预期的行为，我只是想更好地理解它。我发现在以下情况下将事务设置为null：

ANSI_WARNINGS已关闭
尝试对已拒绝插入权限的表执行插入

没关系。对我来说似乎很奇怪的是，如果我打开ANSI_WARNINGS（删除上面的第一个条件），则事务不会设置为null。

为什么？让我知道是否有一些我错过的ANSI_WARNINGS文档可以解释这一点。

重现问题的代码：

using System.Data.SqlClient;
using System;
public class Program
{
    //CREATE TABLE Junk( Name varchar(12) )
    //DENY INSERT ON Junk to someUser

    public static void Main(string[] args)
    {
        bool ansi_warnings_off = false;
        int result;
        SqlCommand cmd = new SqlCommand();

        using (SqlConnection conn = new SqlConnection("Data Source=dbServerName;Initial Catalog=dbName;Persist Security Info=True;User ID=someUser;Password=somePassword;"))
        {
            conn.Open();
            cmd.Connection = conn;

            using (var trans = conn.BeginTransaction())
            {
                cmd.Transaction = trans;

                if (ansi_warnings_off)
                {
                    cmd.CommandText = "SET ANSI_WARNINGS OFF";
                    result = cmd.ExecuteNonQuery();
                    Console.WriteLine("===Result of setting ansi_warnings off = " + result);
                }

                try
                {                   
                    cmd.CommandText = "INSERT INTO Junk(Name) VALUES ('test')";
                    result = cmd.ExecuteNonQuery();
                    Console.WriteLine("===Result of insert = " + result);
                }
                catch (Exception e)
                {
                    Console.WriteLine("===Exception for insert = " + e.Message);
                }

                Console.WriteLine("===Transaction is null? " + (cmd.Transaction == null));
            }
            conn.Close();
        }//using
    }//main
}

ansi_warnings_off = true时的输出：

===Result of setting ansi_warnings off = -1
===Exception for insert = The INSERT permission was denied on the object 'Junk', database 'dbName', schema 'dbo'.
===Transaction is null? True

ansi_warnings_off = false时的输出：

===Exception for insert = The INSERT permission was denied on the object 'Junk', database 'dbName', schema 'dbo'.
===Transaction is null? False

编辑以简化，如果您只是想在SQL Server Management Studio中运行它，这里也会出现一些重现问题的T-SQL。

--------do this as sa---------
CREATE TABLE Junk( Name varchar(12) )
INSERT INTO Junk(Name) VALUES ('original')
DENY INSERT ON Junk to dbUser
---------------------------------

--now do the next two as dbUser

-----update is not attempted----
SET ANSI_WARNINGS OFF
BEGIN TRAN
INSERT INTO Junk(Name) VALUES ('new')
update Junk SET Name = 'updated' where Name = 'original'
COMMIT TRAN
--------------------------------

--------update is done------
SET ANSI_WARNINGS ON
BEGIN TRAN
INSERT INTO Junk(Name) VALUES ('new')
update Junk SET Name = 'updated' where Name = 'original'
COMMIT TRAN
-----------------------------

Answer 1

好吧，我也在msdn上发布了这个问题，但有一个原因：XACT_ABORT设置。看起来像ANSI_WARNINGS和XACT_ABORT遇到的一些错误行为（ANSI_WARNINGS会影响XACT_ABORT行为），我创建了一个Connect问题，这可能无处可去。

当插入权限被拒绝且ANSI_WARNINGS为OFF时，事务被终止

1 个答案: