Shuttle point - save the changes

The shuttle point integrated is a good way to view and edit data to multiple values. If the data comes from a single line and column (delimited), using the internal order process line Fetch and automatic DML to read/write, it work well.

But what happens if the data from multiple lines in a source table? Say 10 lines are selected (right hand of shuttle) off a 50 LOV. The Source of the element of the shuttle has just the query to retrieve the 10 lines and the APEX engine automatically converts multiple values into 1 delimited value required by the shuttle.

But when it comes to saving the changes in the shuttle, there is no easy way to identify what has changed. Say I deselect the option 1 and select 2 new items in the left side of the shuttle. Value of the element in the session state is delimited by colon 1 string containing the currently selected values. How this translates into the ELIMINATION of 1 and 2 INSERTs necessary against the base table?

I can think of to save the front-subimit value in a hidden element, comparing it to the value of after-submit and stuff like that, but that seems a lot of work. What this kind of thing done effectively?

Thank you

HELEN wrote:

But when it comes to saving the changes in the shuttle, there is no easy way to identify what has changed. Say I deselect the option 1 and select 2 new items in the left side of the shuttle. Value of the element in the session state is delimited by colon 1 string containing the currently selected values. How this translates into the ELIMINATION of 1 and 2 INSERTs necessary against the base table?

I can think of to save the front-subimit value in a hidden element, comparing it to the value of after-submit and stuff like that, but that seems a lot of work. What this kind of thing done effectively?

As the table changed with the values of the shuttle contains one column other than the PK and the shuttle update column, this can all be handled with reusable one DML MERGE statement and a utility function:

begin

  merge into shuttled_states ss
  using (
  /*
    The merge source requires a set of matched pairs: the selected shuttle values
    against the corresponding values in relevant DB rows, for example:

    shuttle_st  db_st
    ----------  -----
    X           X       -- X is in both shuttle selection and DB rowset
                Y       -- Y is not in the shuttle selection but is in DB rowset
    Z                   -- Z is in the shuttle selection but not DB rowset

    We therefore need to leave the X row in the DB unchanged, delete the Y row,
    and insert the Z row.

    This query should also contain other columns and values required in matching
    rows in the merge, or in inserted rows.
  */
    select
        shuttle.column_value shuttle_st
      , db.st db_st
    from
        table(string_to_coll(:p37_states)) shuttle
          full outer join shuttled_states db
            on shuttle.column_value = db.st) t
  /*
    Match conditions normally include matching PK and/or other values to get the
    relevant DB rowset, but the main requirement here is a predicate that matches
    using the DB value column from the shuttle/DB rowset pair.
  */
  on (ss.st = t.db_st)
  when matched
  then
  /*
    This is where the restriction applies. Although we don't actually want to
    update any matched rows as they are unaffected by the shuttle selection, the
    MERGE can only delete rows that have been updated. However we can't update
    any of the columns used in the match, so there needs to be at least one
    column available that can be set to the same value to mark the row as
    updated...
  */
    update
    set
        ss.state_name = ss.state_name
  /*
    ...which makes it possible to delete rows that are not selected in the shuttle.
  */
    delete
    where
        t.shuttle_st is null
  /*
    Where there's no match the value is newly selected in the shuttle and is
    inserted as a new row.

    (Other values required should be included in the query, or handled in a
    trigger.)
  */
  when not matched
  then
    insert
      (st)
    values
      (t.shuttle_st);

end;

This method uses to transform the selected values shuttle of a string delimited by two points in a set of SQL. The function provided by Oracle apex_util.string_to_table returns a PL/SQL associative array that is not appropriate for this. If it is possible to convert a string into lines purely using SQL, these methods are rather obscure and only can be reused by cutting-and-pasting. A simple function that returns a collection of standard SQL type can be used as a set of rows in a query through the SQL TABLE operator and is highly reusable:

create or replace function string_to_coll (p_string in VARCHAR2) return sys.ODCIVarchar2List
is

  l_table apex_application_global.vc_arr2;
  l_list  sys.ODCIVarchar2List := new sys.ODCIVarchar2List();

begin

  l_table := apex_util.string_to_table(p_string);

  l_list.extend(l_table.count());

  for i in 1..l_table.count()
  loop
    l_list(i) := l_table(i);
  end loop;

  return l_list;

end;

For purposes of demonstration, this one uses the predefined sys . ODCIVarchar2List collection type. In real life, you would create your own, and of course the function would be in a package, not stand-alone.

Tags: Database

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=============================================
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they may be worth a visit:

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