How to find records given a child parent key

I have a main table that is parent for several children tables. I want to display a button to delete a record in the primary table. I would have preferred to see the this key conditionally so when a master record's child records, I don't show button Delete and no error is raised.
Of course I could scan each child table to find the child records, but I think that must be a generic method

How can I tell if a given parent key has child records?

Thanks in advance
Oscar
PS: I use 10 gr 2

Published by: user10712087 on 01/13/2009 14:31

Oscar

There is no magic/generic way to verify that a main line has no associated detail line. As says Pavan, you must decide which detail the tables to check and them using SQL as usual. (In fact, there is a quick way - you remove the line if there is no child rows with foreign keys which is not cascade, the delete will fail; but of course you can't use this in case the deletion succeeds and the user never wants to push the button).

An addition to the Pavan response: DO NOT under any circumstances to count all records in the table of every detail. Everything you want to know is, is it at least 1 record retail at least 1 tables. No need to count the lines 100 or 1000...

You can do it like this in your PL/SQL

FUNCTION check_children(p_master_id IN INTEGER) RETURN BOOLEAN
IS

  CURSOR c_child1  IS
  select 1 from child_table_1 where master_id = check_children.p_master_id;

  CURSOR c_child2 IS
  select 1 from child_table_2 where master_id = check_children.p_master_id;

  -- etc for all child tables

l_rec_present integer := null;

BEGIN

    OPEN c_child_1;
    FETCH c_child_1 INTO l_rec_present;
    CLOSE c_child_1;

    IF l_rec_present i= 1 THEN
        -- there is a child in child_table_1
        RETURN TRUE;
    END IF;

    OPEN c_child_2;
    FETCH c_child_2 INTO l_rec_present;
    CLOSE c_child_2;

    IF l_rec_present i= 1 THEN
        RETURN TRUE;
    END IF;

-- etc for each child; finally, if no child found:

   RETURN FALSE;
END;

This made sure that (1) you stop once you find any child, and (2) you get all NO_DATA_FOUND and TOO_MANY_ROWS exceptions thrown.

HTH

Nigel cordially

Tags: Database

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