我得到了这个错误!当打开水晶报告follong代码。数据源对象无效
数据源对象无效。
代码是在这里
Cursor = Cursors.WaitCursor;
timer1.Enabled = true;
CrystalReport2 rpt = new CrystalReport2();
obj.connection();
String accept = "SELECT S.Product as Products, COALESCE(Pur_Orders.Quantity, 0) as [Products purchased], COALESCE(Sale_Orders.Quantity, 0) as [Products Sold] From Inv_stock S LEFT JOIN (SELECT Item, SUM(Quantity) AS Quantity FROM Pur_Orders Where Pur_Orders.Date='" + dateTimePicker1.Value.Date + "' GROUP BY Item) AS Pur_Orders ON S.Product = Pur_Orders.Item LEFT JOIN (SELECT Item, SUM(Quantity) AS Quantity FROM Sale_Orders Where Sale_Orders.Date='" + dateTimePicker1.Value.Date + "' GROUP BY Item) AS Sale_Orders ON S.Product = Sale_Orders.Item";
SqlCommand cmd = new SqlCommand(accept, obj.con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds, "Inv_stock");
da.Fill(ds, "Pur_Orders");
da.Fill(ds, "Sale_Orders");
rpt.SetDataSource(da);
obj.con.Close();
Inventory inv = new Inventory();
inv.CrystalReportViewer.ReportSource = rpt;
inv.Visible = true;
是什么问题?????
我做了,但在Crystal报告中得到了不良结果。 请为我提供完整的代码,我是初学者。 – UnKnowN
那你到底在干什么?什么样的不良结果? – Bhaskar
我想要这些结果在水晶报告 http://stackoverflow.com/questions/27638014/mysql-query-select-sum-left-join?noredirect=1#comment43694780_27638014 – UnKnowN