Pre-query trigger issue

Question

Hi,
I have a datablock in the form that is based on a DB table. There are few queriable fields in the block including begin and end dates. If i dont use any pre-query trigger, the records are queried fine. But I want to do a range selection between begin and end_Date fields. Therefore I created a pre-query trigger and set a new_where_clause with all my query_fields and set that as defualt where for my DB block.
SET_BLOCK_PROPERTY (block_id,default_where, where_clause);
But when I see the query in toad session , the query looks like
WHERE (field_1 = :1) and field_1 = :1
that means its running the defualt where clause on the block and the new_where clause at the same time.
I checked the form and I dont have any calls to execute query....
what can be the problem?

Answer 1

1. What is your new_where_clause? (example, please)It's hard to read. Use the \{code\} tag.
FUNCTION get_comparison_phrase (database_column_name       VARCHAR2,
                                                         relational_operator       VARCHAR2,
                                                         selection_field_name       VARCHAR2)
          RETURN VARCHAR2 IS
     BEGIN
          RETURN CASE
                          WHEN NAME_IN (selection_field_name) IS NOT NULL THEN
                                    ' AND '
                               || database_column_name
                               || relational_operator
                               || ' :'
                               || selection_field_name
                          ELSE
                               NULL
                     END;
     END get_comparison_phrase;
where_clause := 'WHERE (1=1)';
if NAME_IN (selection_field_name) IS NOT NULL THEN       ' AND '
                               || database_column_name
                               || relational_operator
                               || ' :'
                               || selection_field_name
                          ELSE
                               NULL
                     END;
where_clause :=
     where_clause
          || get_comparison_phrase (
                    'screening_group_num',
                    '=',
                    'EXCEPTIONAL_EVENTS.screening_group_num'
WHERE (field_1 = :1) and field_1 = :1I do not see 'WHERE (1=1)'; there.
Edited by: Michael Roy on Oct 21, 2009 9:47 AM