A somewhat more complex use of EXECUTE_QUERY with a Where clause...

Question

Basically, what I need to be able to do is when the form receives a certain parameter upon opening; it must immediately run a certain query and populate the data blocks.
I do understand the concept of setting the DEFAULT_WHERE in the PRE_QUERY trigger for the block; but I don't think this will work in my situation.
The reason being is that each data block must run 2 separate queries; and BOTH resulting queries must be populated to each data block, and not overwrite eachother...
Not only that, but the query being executed requires me to reference 2 separate tables (the data coming from one, however its comparing results from 2 separate tables, so I don't think simply modifying the where clause for the data block will even be possible to achieve the results I am looking for.
Maybe further explanation of my queries may help the situation. Basically, each data block is linked to a table for the current logged in user, and then there is a production table as well. When ANYTHING is modified, added, or deleted on the current user's table, they are suppose to "publish" the record to the production table. The EXECUTE_QUERY statement will be responsible for running the query that will populate ALL the records that have yet to be published to the production table. So basically, its running a query that will use an ID and compare each individual field by that ID for any changes from the production table. Then, it runs another query to find records that are in either the production table or user table, and not the other; to flag a new record or deleted record.
I've been thinking about possible ways to do this, but have had no luck unfortunately;
ANY guidance will be greatly appreciated it. I do understand that my description of the problem may be hard to comprehend, so if you need further clarification please ask.
Jason
Message was edited by:
user558647

Answer 1

It would be helpful to give an example of the sort of data in each table and what you want to show in each block. I probably didn't understand most of what you wrote but I think the following may be analogous to your situation and requirements (but you'll have more columns of course):
SQL> CREATE TABLE t_user AS
  2    SELECT
  3      ROWNUM id,
  4      object_name col1,
  5      object_type col2
  6    FROM all_objects
  7    WHERE ROWNUM < 10;
Table created.
SQL>
SQL> DELETE FROM t_user WHERE id = 1;
1 row deleted.
SQL>
SQL> CREATE TABLE t_published AS
  2    SELECT
  3      ROWNUM id,
  4      CASE Mod(ROWNUM,2)
  5        WHEN 0 THEN SubStr(object_name,1,2)
  6        ELSE object_name
  7        END AS col1,
  8      object_type col2
  9    FROM all_objects
10    WHERE ROWNUM < 9;
Table created.
SQL>
SQL>
SQL> SELECT * FROM t_user;
        ID COL1                           COL2
         2 I_USER1                        INDEX
         3 CON$                           TABLE
         4 UNDO$                          TABLE
         5 C_COBJ#                        CLUSTER
         6 I_OBJ#                         INDEX
         7 PROXY_ROLE_DATA$               TABLE
         8 I_IND1                         INDEX
         9 I_CDEF2                        INDEX
8 rows selected.
SQL> SELECT * FROM t_published;
        ID COL1                           COL2
         1 ICOL$                          TABLE
         2 I_                             INDEX
         3 CON$                           TABLE
         4 UN                             TABLE
         5 C_COBJ#                        CLUSTER
         6 I_                             INDEX
         7 PROXY_ROLE_DATA$               TABLE
         8 I_                             INDEX
8 rows selected.
SQL>
SQL> -- yet to be published to the production table
SQL> -- includes records previously published and then updated, but not new
SQL> -- records which have never been published (these are in the other query)
SQL> SELECT u.id, u.col1, u.col2
  2  FROM t_user u, t_published p
  3  WHERE u.id = p.id
  4  AND (
  5    u.col1 != p.col1
  6    OR u.col2 != p.col2
  7    )
  8  ;
        ID COL1                           COL2
         2 I_USER1                        INDEX
         4 UNDO$                          TABLE
         6 I_OBJ#                         INDEX
         8 I_IND1                         INDEX
SQL>
SQL> -- new and deleted records
SQL> SELECT * FROM(
  2    SELECT id, col1, col2, 'NEW' status FROM t_user
  3    UNION ALL
  4    SELECT id, col1, col2, 'DELETED' status FROM t_published
  5  )
  6  WHERE id NOT IN(
  7    SELECT id FROM t_user
  8    INTERSECT
  9    SELECT id FROM t_published
10  )
11  ;
        ID COL1                           COL2                STATUS
         9 I_CDEF2                        INDEX               NEW
         1 ICOL$                          TABLE               DELETED
SQL> Basically, I think the answer is in the query and not the Where Clause.
I think you want one of these queries in each block, so set the blocks' queries (are you changing that query based on the parameter passed in, or just executing the query, you're not clear on that) and then do
go_block('B2');
execute_query;
go_block('B1');
execute_query;