How to read the objects and collections dynamically?

Hello
I want to read database/collection objects dynamically. Please advice!
Here is an example

Create the user as an object type (name varchar2 (100), number (3)) of the age
/

create a family of fonts as a user table
/

I want to do something like this

DECLARE
user of the var;
BEGIN
...
...
SELECT "family (1)" INTO var FROM DUAL;
...
...
END;
/

Thank you

As I suggested, you can define your own method of "diff" for the object. You haven't told us exactly what form you would like to work to take. I'll define a (pretty useless) function which will just create a string that tells you how to modify the data of an object to match the data in another. Obviously, you would like a more useful output. Potentially, rather than a member function, you can choose a procedure Member who emits DML is required for the underlying table is necessary.

SQL> ed
Wrote file afiedt.buf

  1  CREATE OR REPLACE TYPE location_typ AS
  2  OBJECT
  3  (
  4    building_no NUMBER,
  5    city        VARCHAR2(40),
  6    MEMBER FUNCTION diff(
  7                l location_typ)
  8    RETURN VARCHAR2
  9  )
 10* ;
SQL> /

Type created.

SQL> ed
Wrote file afiedt.buf

  1  CREATE OR REPLACE TYPE BODY location_typ
  2  AS
  3    MEMBER FUNCTION diff(
  4      l location_typ)
  5    RETURN VARCHAR2
  6    IS
  7      l_diff_str varchar2(4000);
  8    BEGIN
  9      IF building_no != l.building_no THEN
 10        l_diff_str := 'Building_no needs to change from ' || building_no ||
 11                         ' to ' || l.building_no;
 12      END IF;
 13      IF city != l.city THEN
 14        l_diff_str := l_diff_str ||
 15                        'City needs to change from ' || city ||
 16                          ' to ' || l.city;
 17      END IF;
 18      RETURN l_diff_str;
 19    END;
 20* END;
 21  /

Type body created.

SQL> DECLARE
  2    loc location_typ;
  3    secloc location_typ;
  4    a NUMBER;
  5  BEGIN
  6    loc    :=NEW location_typ(300, 'San Francisco');
  7    secloc :=NEW location_typ(200, 'Redwood Shores');
  8    dbms_output.put_line( loc.diff( secloc ) );
  9  END;
 10  /
Building_no needs to change from 300 to 200City needs to change from San
Francisco to Redwood Shores

PL/SQL procedure successfully completed.

Justin

Published by: Justin Cave on 9 April 2012 14:12

Tags: Database

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