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on_data_check - save changes to database

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Hi there,

i reuse SALV in my ABAP-Webdynpro to edit data. In my view the user is allowed to insert, edit and delete lines of the table. So far it is working fine.

I also use the on_data_check-Event to find out which rows are edited, inserted or deleted.

Does anyone have a code example for writing those changes to a database?

I think this is not easy to manage especially when you allow all sorts of changes...

David Wallner

Edited by: David Wallner on Jun 8, 2009 11:02 AM

Accepted Solutions (1)

Accepted Solutions (1)

Former Member
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Using the parameter R_PARAM you can easily find the indexes of inserted/deleted/changed rows and even the specific change sothat you don't need to verify the complete context table data to find changes. Here is the code sample below.

    ls_mod_cell type salv_wd_s_table_mod_cell,
    ls_row      type salv_wd_s_table_row.

    <l_value> type any.

    "if no errors.
  if r_param->t_error_cells is initial.
   "Index & contents of changed cells as below.
  loop at r_param->t_modified_cells into ls_mod_cell.
    clear ls_mod.
      "collect all the changes into local variable and perform DB operation later
    ls_mod-index     = ls_mod_cell-index.
    ls_mod-attribute = ls_mod_cell-attribute.
    assign ls_mod_cell-r_value->* to <l_value>.
    ls_mod-value     = <l_value>.
    append ls_mod to lt_mod.
  " write changed data to db using table lt_mod
  "similarly get the indexes of inserted rows
  loop at r_param->t_inserted_rows into ls_row.
    clear ls_mod.
    ls_mod-index = ls_row-index.
    append ls_mod to lt_mod.
  "using these indexes collect the actual records from context and write to db

  "same way you can also get indexes of deleted rows from r_param->t_deleted_rows



Answers (2)

Answers (2)

Former Member
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Check this tutorial []



Active Contributor
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Hi David,

When you make any kind of changes (insert/delete/change) all these changes get reflected in your context node. So when you want to save these entries into database, just read your context nodes contents by using get_static_attributes_table. Then use this internal table to modify your database table. Refer this code snippet below which is based on Suman's reply in this [thread|;:



METHOD ondatacheck .
DATA: node_node_flighttab TYPE REF TO if_wd_context_node,
elem_node_flighttab TYPE REF TO if_wd_context_element,
lt_sflight TYPE if_resultview=>elements_node_flighttab.

* save data only if no error has occured
CHECK r_param->t_error_cells IS INITIAL.
node_node_flighttab = wd_context->get_child_node( name = `NODE_FLIGHTTAB` ).
* get data from context node <NODE_FLIGHTTAB>
IMPORTING table = lt_sflight ).

*validate value
select carrid from sflght into v_sflight where carrid = r_param-value.
if sy-subrc ne 0.
* raise error message
*update to the data base.
modify table zsflight from lt_sflight transporting carrid.