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6.6

Update changed columns in a datagrid

Asked by edwaldo1 in Programming for ASP.NET, Microsoft Visual C#.Net, WebApplications

Hi

We're struggling to find the best approach to updating only the columns that have changed in a ASP.NET 2.0 datagrid.

What we have:
The datagrid is bound to a dataset which can be very large (+40,000 rows). All the datagrid rows are in edit mode, ie. the edit item template acts as the 'add row', the item templates all contain editable controls (textboxes, checkboxes etc), and there is a single save button for each row. In addition there is a 'save all' button.

All the editable controls have an server-side onchanged event. After clicking save, the onchanged event gets the index of the row and adds it to a list. The update method then iterates this list and builds the SQL to do an update containing ALL the columns in that row.

What we need:
We need to build an SQL update statement for ONLY the columns that have changed, not the whole row. The simple reason for this is so we can log exactly which columns have changed at the same time, rather then a log which just lists all columns.

The problem:
We can't persist the original dataset in viewstate or session and perform some comparisons (or use the columnchanged datatable event??) because it's too large. We can't think of an elegant way to capture which columns have changed - and at the same time get the corresponding field name in the database - to dynamically build the update statement and write the log. It's almost like I need a commandarguments property for the textbox, like a linkbutton, to store the original contents and the DB column name, then capture that on the onchanged event and build my UPDATE statement.

We could store a javascript array on the client with the old value, control ID, DB column name and row index but this seems really complex. Surely this isn't a strange request - wanting to build an update statement with only the changed columns - are we missing something obvious?

Many thanks.

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Update changed columns in a datagrid

Asked by edwaldo1 in Programming for ASP.NET, Microsoft Visual C#.Net, WebApplications

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