回滚后返回的ExecuteNonQuery价值 [英] Return value of ExecuteNonQuery after rollback

问题描述

假设我们有一个存储过程，做喜欢的事，这样的：

Assuming that we have a stored procedure that does like something this:

BEGIN TRANSACTION
    UPDATE sometable SET aField = 0 WHERE anotherField = 1;       
    UPDATE sometable SET aField = 1 WHERE anotherField = 2;
ROLLBACK TRANSACTION;

和C＃中，我们有这样的事情：

And from C# we have something like this:

using (var connection = new SqlConnection("connection string")) 
{
    connection.Open();
    var cmd = connection.CreateCommand();
    cmd.CommandType = CommandType.StoredProcedure;
    cmd.CommandText = "my_procedure";
    var res = cmd.ExecuteNonQuery();                
}

为什么我没有收到获得资源== -1？ 我仍然得到受影响的行数。当文档状态<一href="http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommand.executenonquery.aspx">"If发生回滚，返回值也为-1

Why I'm not getting getting res == -1? I'm still getting the number of affected rows. When the documentation states "If a rollback occurs, the return value is also -1"

什么，我在这里失踪？

推荐答案

看来返回值的ExecuteNonQuery 不受即使文件明确指出，回滚IS一样。下面是一些可能的解决方法。

It appears that the return value of ExecuteNonQuery is unaffected by a rollback even though the documentation clearly states that is does. Here are some possible workarounds.

1）使用的ExecuteScalar

SP：的

DECLARE @RowCount INT
DECLARE @Error INT

BEGIN TRAN

UPDATE Table1 SET Value1 = NULL

SELECT @RowCount = @@ROWCOUNT, @Error = @@ERROR

IF @Error <> 0 BEGIN
    ROLLBACK TRAN
    SELECT -1
END ELSE BEGIN
    COMMIT TRAN
    SELECT @RowCount
END

C＃的

using (SqlConnection dbConnection = new SqlConnection("Data Source=.;Initial Catalog=Database1;Integrated Security=True;MultipleActiveResultSets=True"))
{
    dbConnection.Open();

    using (SqlCommand command = dbConnection.CreateCommand())
    {
        command.CommandText = "QuickTest";
        command.CommandType = CommandType.StoredProcedure;

        rowsAffected = command.ExecuteScalar();
    }
}

2）使用返回/输出参数

SP：的     DECLARE @RowCount INT     DECLARE @Error INT

SP: DECLARE @RowCount INT DECLARE @Error INT

BEGIN TRAN

UPDATE Table1 SET Value1 = NULL

SELECT @RowCount = @@ROWCOUNT, @Error = @@ERROR

IF @Error <> 0 BEGIN
    ROLLBACK TRAN
    RETURN -1
END ELSE BEGIN
    COMMIT TRAN
    RETURN @RowCount
END

C＃的

using (SqlConnection dbConnection = new SqlConnection("Data Source=.;Initial Catalog=Database1;Integrated Security=True;MultipleActiveResultSets=True"))
{
    dbConnection.Open();

    using (SqlCommand command = dbConnection.CreateCommand())
    {
        command.Parameters.Add(new SqlParameter() {Direction = ParameterDirection.ReturnValue });
        command.CommandText = "QuickTest";
        command.CommandType = CommandType.StoredProcedure;

        command.ExecuteNonQuery();
        rowsAffected = command.Parameters[0].Value;
    }
}

3）将回滚/提交逻辑到code

这会给你的能力，以确定是否发生回退和输出必要的-1时的值。本次交易的语句就需要从存储过程中删除。

This would give you the ability to determine if a rollback occurred and output a value of -1 when necessary. The transaction statement would need to removed from the sproc.

SP：的

UPDATE Table1 SET Value1 = NULL

C＃：的

using (SqlConnection dbConnection = new SqlConnection("Data Source=.;Initial Catalog=Database1;Integrated Security=True;MultipleActiveResultSets=True"))
{
    dbConnection.Open();

    using (SqlTransaction tran = dbConnection.BeginTransaction())
    {
        using (SqlCommand command = dbConnection.CreateCommand())
        {
            command.Transaction = tran;

            try
            {
                command.Parameters.Add(new SqlParameter() {Direction = ParameterDirection.ReturnValue });
                command.CommandText = "QuickTest";
                command.CommandType = CommandType.StoredProcedure;

                rowsAffected = command.ExecuteNonQuery();
            }

            catch (Exception)
            {
                rowsAffected = -1;
                throw;
            }

            tran.Commit();
        }
    }
}

正如previously的@@ ROWCOUNT值，为ExecuteNonQuery结果都受到触发。的

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