Loading table data in a form with a custom query

Question

Hi everyone. I have this challenge with oracle forms. At the top of my form is an LOV text field. And at the bottom is a table (looks just like a master detail form). What I want to do is to select a value from the LOV, and then populate the detail block with information based on a query. The information is not linked to the table assigned to the master block or the table assigned to the detail block.
Let's say the master block contains an LOV which contains dates like AUG-09, DEC-09. After selecting a value, I want to be able to run a query say something like:
select full_name, job_title from per_all_boolys_f where period_name = 'AUG-09' (from master block)
Then this quer will then be used to populate the rows and columns in my detail block.
Is it possible to do this and how would I go about this.
Thank you

Answer 1

Igwe,
Based on your query example, you are only selecting from a single table. If this is the case, why not base your Detail Block on this table and then set the DEFAULT_WHERE clause property of the block to: ':MASTER_BLOCK.DATE' and then call Go_Block('DETAIL_BLOCK') and Execute_Query to populate your detail block?
If you truly have a dynamic query, then I would suggest using a From-Clause query based Detail Block? This would allow you to change your query anyway you want so long as it returns the same number of columns and column names don't change. Here is the setup:
1. Set the appropriate properties on your DETAIL BLOCK (as follows)
     a. Database Data Block = "Yes"
     b. Query Data Source Type = 'FROM clause query'
     c. Query Data Source Name = 'Leave blank or enter basics of your SQL query here'
     d. ORDER BY Clause = 'Enter any ordering requirements here or set them as needed in your code.'
     e. Set Insert Allowed, Update Allowed, and Delete Allowed = 'No'
2. Write the code to define your SQL query and assign it to the QUERY_DATA_SOURCE_NAME property of your Detail Block. This code can be in any trigger that allows execution of Restricted Built-ins (When-New-Block-Instance, When-New-Item-Instance, When-List-Changed, etc) because you will need to call the Go_Block and Execute_Query built-ins. In your situation, you may want to set a flag variable (parameter or global) in your Key-Next-Item and Post-Text-Item triggers and then test this flag variable in a When-New-Item-Instance trigger. For example:
/* Example Key-Next-Item trigger (duplicate this logic in your Post-Text-Item trigger */
/* or replace both triggers with a When-Validate-Item trigger) */
/* My example will use a Parameter object as a variable so you will need to create the */
/* QUERY_DETAIL_BLOCK parameter and set it to a CHAR(1) */
/* data type and set the DEFAULT VALUE to 'N' */
DECLARE
     /* Declare any variables you need here */
BEGIN
     -- Your trigger specific code here....
     :Parameter.QUERY_DETAIL_BLOCK := 'Y';
END;
/* Master Block When-New-Item-Instance trigger sample */
DECLARE
     v_SQL     VARCHAR2(2000);
BEGIN
     -- Any preexisting W-N-I-I trigger code you may have here already
     -- New code...
     IF ( :Parameter.QUERY_DETAIL_BLOCK = 'Y' ) THEN
          -- Reset the parameter first
          :Parameter.QUERY_DETAIL_BLOCK := 'N');
          -- Build the Dynamic Query
          v_SQL := 'select full_name, job_title from per_all_boolys_f where period_name = '' '||:MASTER_BLOCK.DATE|| ' '';
          Set_Block_Property('DETAIL_BLOCK', QUERY_DATA_SOURCE_NAME, v_SQL);
          Go_Block('DETAIL_BLOCK');
          Execute_Query;
          Go_Block('MASTER_BLOCK');
     END IF;
END;Please note, the above code is an example only - you will need to modify this example to work in your Form. Also, if your query really only selects from a single table, I really encourage you to use the first option of basing the detail block on the table and setting the Default Where clause property.
Hope this helps.
Craig...
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