CommandBuilder 和 SqlTransaction 插入/更新行

发布于 2024-09-01 18:57:03 字数 1589 浏览 2 评论 0原文

我可以让它发挥作用,但我觉得我做得不对。

第一次运行时,它按预期工作,并在“thisField”包含“doesntExist”的位置插入一个新行

但是,如果我随后运行它,则会收到运行时错误,无法插入重复项键,因为它违反了主键“thisField”。


static void Main(string[] args)
{           
    using(var sqlConn = new SqlConnection(connString) )
    {
        sqlConn.Open();
        var dt = new DataTable();

        var sqlda = new SqlDataAdapter("SELECT * FROM table WHERE thisField ='doesntExist'", sqlConn);
        sqlda.Fill(dt);

        DataRow dr = dt.NewRow();

        dr["thisField"] = "doesntExist"; //Primary key

        dt.Rows.Add(dr);

        //dt.AcceptChanges(); //I thought this may fix the problem. It didn't.

        var sqlTrans = sqlConn.BeginTransaction();

        try
        {
            sqlda.SelectCommand = new SqlCommand("SELECT * FROM table WITH (HOLDLOCK, ROWLOCK) WHERE thisField = 'doesntExist'", sqlConn, sqlTrans);

            SqlCommandBuilder sqlCb = new SqlCommandBuilder(sqlda);

            sqlda.InsertCommand = sqlCb.GetInsertCommand();
            sqlda.InsertCommand.Transaction = sqlTrans;

            sqlda.DeleteCommand = sqlCb.GetDeleteCommand();
            sqlda.DeleteCommand.Transaction = sqlTrans;

            sqlda.UpdateCommand = sqlCb.GetUpdateCommand();
            sqlda.UpdateCommand.Transaction = sqlTrans;

            sqlda.Update(dt);

            sqlTrans.Commit();
        }
        catch (Exception)
        {
            //...
        }
    }
}

即使我可以通过移动 AcceptChanges 的尝试和错误,或者在 Begin/EndEdit 中封装更改,然后我开始遇到“并发冲突”,它不会更新更改,而是告诉我它失败了更新 1 个受影响行中的 0 个。

我错过了什么明显的疯狂的东西吗?

I can get this to work, but I feel as though I'm not doing it properly.

The first time this runs, it works as intended, and a new row is inserted where "thisField" contains "doesntExist"

However, if I run it a subsequent time, I get a run-time error that I can't insert a duplicate key as it violate the primary key "thisField".


static void Main(string[] args)
{           
    using(var sqlConn = new SqlConnection(connString) )
    {
        sqlConn.Open();
        var dt = new DataTable();

        var sqlda = new SqlDataAdapter("SELECT * FROM table WHERE thisField ='doesntExist'", sqlConn);
        sqlda.Fill(dt);

        DataRow dr = dt.NewRow();

        dr["thisField"] = "doesntExist"; //Primary key

        dt.Rows.Add(dr);

        //dt.AcceptChanges(); //I thought this may fix the problem. It didn't.

        var sqlTrans = sqlConn.BeginTransaction();

        try
        {
            sqlda.SelectCommand = new SqlCommand("SELECT * FROM table WITH (HOLDLOCK, ROWLOCK) WHERE thisField = 'doesntExist'", sqlConn, sqlTrans);

            SqlCommandBuilder sqlCb = new SqlCommandBuilder(sqlda);

            sqlda.InsertCommand = sqlCb.GetInsertCommand();
            sqlda.InsertCommand.Transaction = sqlTrans;

            sqlda.DeleteCommand = sqlCb.GetDeleteCommand();
            sqlda.DeleteCommand.Transaction = sqlTrans;

            sqlda.UpdateCommand = sqlCb.GetUpdateCommand();
            sqlda.UpdateCommand.Transaction = sqlTrans;

            sqlda.Update(dt);

            sqlTrans.Commit();
        }
        catch (Exception)
        {
            //...
        }
    }
}

Even when I can get that working through trial and error of moving AcceptChanges around, or encapsulating changes within Begin/EndEdit, then I begin to experience a "Concurrency violation" in which it won't update the changes, but rather tell me it failed to update 0 of 1 affected rows.

Is there something crazy obvious I'm missing?

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评论(1

难得心□动 2024-09-08 18:57:03

我能够通过在填充数据表后手动删除行来解决我的问题。我无法使用 dt.Clear() ,因为这样做仍然会由于尝试插入具有重复主键的记录而导致异常。


sqladapter.Fill(dt);

foreach( DataRow d in dt.Rows )
    d.Delete();

DataRow dr = dt.NewRow();

dr.BeginEdit();
//update dr
dr.EndEdit();

dt.Rows.Add(dr);

上面的代码将成功地让我插入一个新行,并更新一个预先存在的行。删除 foreach 将生成“无法在对象中插入重复的键”,所以我觉得我至少找到了一个解决方案;虽然,我觉得这不是的解决方案。

希望这对某人有帮助。

I was able to over come my problems by manually deleting the row(s) after filling the datatable. I'm unable to use dt.Clear(), as doing so still results in an exception due to trying to insert a record with a duplicate primary key.


sqladapter.Fill(dt);

foreach( DataRow d in dt.Rows )
    d.Delete();

DataRow dr = dt.NewRow();

dr.BeginEdit();
//update dr
dr.EndEdit();

dt.Rows.Add(dr);

The above will successfully let me insert a new row, and update a pre-existing row. Removing the foreach will generate the "Cannot insert duplicate key in object," so I feel I've at least found a solution; although, I feel as though it's not the solution.

Hope this helps someone.

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