Help on execute_query

Question

Hi to all,
In a Form I have placed a button. in the trigger WHEN_BUTTON_PRESSED I have a code that:
1) create a WHERE string (LC$Whr) with some filter Items, initialized in the Header block;
2) after use this statement:
Set_Block_Property( 'MYBLOCK', DEFAULT_WHERE, LC$Whr ) ;
Go_Block('MYBLOCK');
Execute_Query ;
It is possible to control if the query return a valid search ?
In other words I need this:
If the Select in the Execute_query has found record(s) then display the Canvas with the Data Block found, else display an Alert message.
I hope yes, but I don't know as.
Thank You and Best Regards.
Gaetano

Answer 1

Or
Query Count Without EXECUTE-ing a Query
FUNCTION query_count (p_block_name VARCHAR2) RETURN NUMBER
IS
  cnt NUMBER;
BEGIN
  GO_BLOCK(p_block_name);
  COUNT_QUERY;
  cnt := GET_BLOCK_PROPERTY(p_block_name, QUERY_HITS);
  IF FORM_SUCCESS THEN
    RETURN (cnt);
  ELSE
    MESSAGE('Error in getting Query Hits for block '||:SYSTEM.CURRENT_BLOCK);
    RAISE FORM_TRIGGER_FAILURE;
  END IF;
END;
WHEN-BUTTON-PRESSED trigger of 'Details' button
DECLARE
   v_cnt NUMBER;
BEGIN
   v_cnt := query_count(<detail block name>);
   IF (v_cnt = 0) THEN
     p_show_alert('No Details exist.');
   ELSE
     GO_BLOCK(<detail block name>);
     EXECUTE_QUERY;
   END IF;
END;Reagrds