Connecting strings for execution as SQL-Statement

Question

Hello to all.
I've the problem, that I want to write a package which handels occuring erros as far as possible automatically.
One part is to recompile invalid objects.
I can find all these objects by useing the following cursor:
CURSOR curInvalidObjects
IS SELECT OBJECT_TYPE, OWNER, OBJECT_NAME
          from dba_objects a
          where STATUS = 'INVALID' and
          OWNER = 'BESECKE' AND
          OBJECT_TYPE in ( 'PACKAGE BODY',
'PACKAGE', 'FUNCTION', 'PROCEDURE',
'TRIGGER', 'VIEW' )
          order by OWNER, OBJECT_TYPE, OBJECT_NAME;
After opening the cursor I can go trough the records and recompile the objects with something like this:
alter || recInvalidObjects.OBJECT_TYPE || ' '
|| recInvalidObjects.OWNER || '.' ||
recInvalidObjects.OBJECT_NAME || compile;
But that does not work. In this way I can't get any executable SQL-Statement. It just becomes a string, but it's not executable.
I think it's a simple problem, but I tried to find anything about executable stings in the documentation I have, and I could not find anything. So can anybody give me a short hint, how to create an executable statement?
Thanks a lot.
Susanne Saalmann

Answer 1

If you just recompile without taking the correct order of compilation into account, you will have to run your statement a couple of times. This script solves that:
SET HEADING OFF
SET FEEDBACK OFF
SET PAGES 9999
SET TIMING OFF
SET TERMOUT ON
COLUMN noprn NOPRINT
SPOOL comp.sql
SELECT 'ALTER '||
DECODE( o.object_type, 'PACKAGE BODY', 'PACKAGE', o.object_type)||
' '||decode(o.object_type,'JAVA CLASS','"',null)||
o.object_name || decode(o.object_type,'JAVA CLASS','"',null)||
' COMPILE '||
DECODE( o.object_type, 'PACKAGE BODY', 'BODY;', ';'),
COUNT( d.name ) noprn
FROM user_objects o,
user_dependencies d
WHERE o.object_name = d.referenced_name(+)
AND o.object_type = d.referenced_type(+)
AND o.status = 'INVALID'
GROUP BY o.object_name, o.object_type
ORDER BY noprn DESC
SPOOL OFF
SET HEADING ON
SET FEEDBACK ON
SET PAGES 14
START comp.sql
SHOW USER
SELECT object_type, status, count(*)
FROM user_objects
GROUP BY object_type, status