Getting Sort parameters(order,columns) from DatabaseFilter.

Question

Hi all,
Could anyone guide me on how to get the Columns that are being selected for sorting
and the sorting order itself from the DatabaseFilter. We have our own class which
takes in the column names and sort order and generates the SQL(similar to the
DataBaseFilter). Therefore, I need to get the selected columns from DataBase Filter.
I have tried :
//sort..first get sortFilterService
sortFilterService = SortFilterService.getInstance(getRequest());
//get associated sort filter
DatabaseFilter uiFilter=sortFilterService.getDatabaseFilter(getGridName());
//get SQL params..
String sortClauseFromUI=uiFilter.getOrderByClause().getSQL();
SQLParameter[] params=uiFilter.getOrderByClause().getParameters();
Whenever i try this, the params[] is always empty..but the String sortClauseFromUI
contains "ORDER BY "COLUMN1"..."COLUMN2"...DESC" etc. Could anyone shed some light?
Thanks.
Vik.

Answer 1

It all depends on how much data you need to delete from the database.
If all you need is the id, and you generate that id into the checkboxes, it becomes fairly simple
String[] idsToDelete = request.getParameterValues("checkbox");
This will give you an array of the values of all the selected checkboxes. - ie a String[] of all the ids you need to delete.
String[] idsToDelete = request.getParameterValues("checkbox");
for(int i=0; i<idsToDelete.length; i++){
  deleteRecord(Integer.parseInt(idsToDelete));
The hashtable method comes in useful when you need to call on the object itself to delete itself. That might not be necessary in this case.
Hope this helps,
evnafets