Hi all,
I am currently using dataview rowfilters to change the data shown in a datagridview.
I basically have two datagridviews on a form. One (DGV_RFI), has a list of contract numbers 200 to 500, with each contract number having idents ranging from 1 to 100. When the user scrolls through this list of idents I would like my other Datagridview (DGV_RFIDraw) to change to show records relating to the contract and ident currently selected by the user in DGV_RFI.
DGV_RFI is bound to a SQL Server table and DGV_RFIDraw is bound to a SQL Server View. Both DGV's use a dataview to display their data (The dataviews are bound to datasets).
Currently I am using the following code to filter DGV_RFIDraw:
Private Sub DGV_RFI_CellEnter(ByVal sender As Object, ByVal e As System.Windows.Forms.DataG
DV_RFIDraw.RowFilter = "Cont = " & TXT_RFIContract.Text & " AND RFI = " & TXT_RFI.Text & ""
End Sub
This code works but as the user scrolls through the list (DGV_RFI) it is very slow.
Can anyone think of an alternative way of making this smoother?
Cheers
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You can really streamline things by having your second grid simply receive the data from the selected cell of the first grid, instead of going through a database View. When a row becomes selected in the first grid, you could push the selected data to the other grid through the DGV_RFI_SelectionChanged event.
VBRocks,
Do you mean by using something like this?
DS_RFIDraw1.Clear()
SQL_RFIDraw.Parameters("@C
SQL_RFIDraw.Parameters("@R
SDA_RFIDraw.SelectCommand = SQL_RFIDraw
SQL_RFIDraw.ExecuteNonQuer
SDA_RFIDraw.Fill(DS_RFIDra
I think creating a database connection to sql, running query, and populating results for each cellenter event would be EVEN slower than filtering the grid. Try moving the code from CellEnter event to SelectionChanged event. This way, it would fire only on ROW selection changes and not on CELL selection changes (you may click on a different cell within the same row and it would do all the filtering again!!!).
Also, i am not sure how you get the values for the filter here
DV_RFIDraw.RowFilter = "Cont = " & TXT_RFIContract.Text & " AND RFI = " & TXT_RFI.Text & ""
i would use the selectedrows of the grid like this
DV_RFIDraw.RowFilter = "Cont = " & dgv.SelectedRows(0).Cells(
I guess you should also consider whether new idents may be added for any given contract AFTER the grids are loaded. If so, you'll want to requery every time the row selection changes in order to show the latest information. So, If you are presenting enough data for performance to be impacted by a lot of hits to the database or you know that the idents won't be changing very often, then filtering would be fine.
Cool.
You know, loading all of your data into a DataView, and just filtering the view works great, when you don't have very many records. But, when you have a lot of records to work with, it's much faster to query the database just for the records that you need.
I've proved this over and over again. In fact, I'm working on a very large database now that implements that approach.
Just for your info, you can also use an SqlDataReader, which retrieves the data faster than loading a DataSet using an adapter, but it's read-only, and once you receive it, you still have to loop through each row and do something with it, like load it into a grid or table.
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by: VBRocksPosted on 2009-10-22 at 07:07:46ID: 25634355
The absolute fastest way to handle this is to NOT load all of the records in the grid that needs to be filtered, in fact, don't load any...
When a user selects a row in the main grid, query the SQL Server for all of the related records, and then display those in the (filtered) grid.
Make sense?