Database table not updating with the changes

Question

Hi friends,
                Iam having a tablecontrol where iam gettting the data from the ztable for a particular key field.  When i change certain fields in the table control and when i click save, it should update the changes in the ztable.
   module save output.
   modify zslip_po1 from table x_po1_slip.
here slpno is the key field.  if I change a field for a particular slpno it should update the changes for that slpno value only.
but it is not updating the changes. although iam setting the slpno field dynamically.
Please give me ideas.
thanks and regards
Murali Krishna T

Answer 1

Hi,
1. Have 2 Internal Tables, the first one must contain the original data(before change ) and the second one  contains the update data(after changed ie. table control data).
2. loop the first table and read the data from the second table using index.
3. inside the loop, compare the work area of both the internal table.
   if both are same, then no change was made to that particular record, so no need for updation
   if both are not same, then some changes were made on that record, so need to update.
4. use modify command to update that particular record from the work area.
i think in performance wise also this logic will be helpful, since we are updating only the changed record.
since this is addon table, so i hope the no of records will also less, so no need to worry about loop.
check with this, it may work out......
thank you,
SenthilPandi C
Edited by: SenthilPandi ChandraSekaran on Feb 4, 2010 5:36 PM