获取数据库错误：条件表达式C＃中的数据类型不匹配

Question

Pretty new to c# and db programming. And I've taken over somebody else's code. I'm getting an error when I'm trying to update the DB. Here's the code:

   private void EnableEvent(int eventID)
    {


        OleDbCommand oleCMD = new OleDbCommand();
        oleCMD.Connection = Database.SqlConn();
        OleDbTransaction oleTrans = oleCMD.Connection.BeginTransaction();
        oleCMD.Transaction = oleTrans;

        try
        {
            StringBuilder sql = new StringBuilder();
            sql.AppendFormat("UPDATE Events SET isActive = 1 where EventID='{0}'", eventID);

            oleCMD.CommandText = sql.ToString();
            // insert the header
            oleCMD.ExecuteNonQuery();
            oleTrans.Commit();
        }
        catch(Exception e)
        {
            MessageBox.Show(e.Message, "Database Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
        }
        finally
        {
            oleCMD.Connection.Close();
            oleCMD.Dispose();
        }
    }

Answer 1

EDIT:

Gotcha now ... format your query like below and it would surely work

        StringBuilder sql = new StringBuilder();
        sql.AppendFormat("UPDATE Events SET isActive = 1 where EventID = {0}", eventID);

With Numeric fields yiou shouldn't put apostrophes around the value. That was the problem.

Answer 2

Try this!

private void EnableEvent(int eventID)
{
    OleDbConnection myConn = new OleDbConnection(myConnString);
    myConn.Open();

    OleDbCommand myCommand = myConn.CreateCommand();
    OleDbTransaction myTrans;
    // Start a local transaction
    myTrans = myConn.BeginTransaction();
   // Assign transaction object for a pending local transaction
    myCommand.Connection = myConn;
    myCommand.Transaction = myTrans;

    try
    {
        StringBuilder sql = new StringBuilder();
        sql.AppendFormat("UPDATE Events SET isActive = 1 where EventID='{0}'", eventID);

        myCommand.CommandText = sql.ToString();
        // insert the header
        myCommand.ExecuteNonQuery();
        myTrans.Commit();
    }
    catch(Exception e)
    {
        MessageBox.Show(e.Message, "Database Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
    }
    finally
    {
        myCommand.Connection.Close();
        myCommand.Dispose();
    }
}

Let me know if this helps!