Oracle plsql switch case and sqlplus spool - oracle

Question

The following query runs in an error at the THAN statement. Is it possible to use a select in the THAN statement? Any ideas on how to make it work?
SET SERVEROUTPUT ON
SET TERMOUT OFF
SET ECHO OFF
SET FEEDBACK OFF
SET LINESIZE 140
SET PAGESIZE 0
exec dbms_output.enable(NULL);
SPOOL C:\test\user.sql
BEGIN
SELECT DISTINCT version,
CASE
WHEN version = '12.1.0.2.0'
THEN
dbms_output.put_line(''select' || 'Alter user ' || username || ' identified by values ' || '''EE3FD1E715941451''' || ';''); from DBA_USERS_WITH_DEFPWD;
ELSE
dbms_output.put_line(''select' || 'Alter user ' || username || ' identified by values ' || '''Invalid Password''' || ';''); from DBA_USERS_WITH_DEFPWD;
FROM PRODUCT_COMPONENT_VERSION;
END;
SPOOL OFF
Edit:
Code which is working looks like this:
spool c:/test/user.sql
select 'Alter user ' || username || ' identified by values ' || '''Invalid Password''' || ';'
from DBA_USERS_WITH_DEFPWD;
spool off
Spool output example:
Alter user GSMUSER identified by values 'Invalid Password';
Alter user MDSYS identified by values 'Invalid Password';
Alter user OLAPSYS identified by values 'Invalid Password';
Alter user LBACSYS identified by values 'Invalid Password';
The script is not working with new Oracle DB Versions. Since Oracle 12.1.0.2.0 it’s not possible to set the password to an invalid password. I need to build in version identification for this issue. All Oracle Databases with a version below 12.1.0.2.0 should be treated with the old script and the passwords should be set to “invalid password”. All newer versions should get some kind of standard password for now.

Answer 1

Maybe you need something like this:
...
DECLARE
vVersion varchar2(100);
BEGIN
/* get the version */
SELECT DISTINCT version
into vVersion
from PRODUCT_COMPONENT_VERSION;
--
/* loop through users */
for i in ( select * from DBA_USERS_WITH_DEFPWD) loop
/* print a different statement, based on vVersion, for the current user */
if ( vVersion = '12.1.0.2.0' ) then
dbms_output.put_line('Alter user ' || i.username || ' identified by values ' || '''EE3FD1E715941451''' || ';');
else
dbms_output.put_line('Alter user ' || i.username || ' identified by values ' || '''Invalid Password''' || ';');
end if;
end loop;
END;
...

Answer 2

Another version which solves the problem without PL/SQL and correct spool:
SET TERMOUT OFF
SET ECHO OFF
SET LINESIZE 140
SET FEEDBACK OFF
SET PAGESIZE 0
SPOOL user.sql
SELECT 'alter user ' || username || ' identified by values '''
|| CASE
WHEN b.version = '12.1.0.2.0' THEN '462368EA9F7AD215'
ELSE 'Invalid Password'
END
|| ''';'
FROM DBA_USERS_WITH_DEFPWD a,
(SELECT VERSION
FROM PRODUCT_COMPONENT_VERSION
WHERE UPPER (product) LIKE '%DATABASE%') b;
SPOOL OFF
#user.sql

Answer 3

If it's not possible to use PL/SQL:
SET TERMOUT OFF
SET ECHO OFF
SET LINESIZE 140
SET FEEDBACK OFF
SET PAGESIZE 0
spool user.sql
SELECT 'Alter user '
|| A.USERNAME
|| ' identified by values '
|| '''EE3FD1E715941451'''
|| ';'
FROM DBA_USERS_WITH_DEFPWD a,
(SELECT DISTINCT version
FROM PRODUCT_COMPONENT_VERSION) b
WHERE version = '12.1.0.2.0'
UNION ALL
SELECT 'Alter user '
|| A.USERNAME
|| ' identified by values '
|| '''Invalid Password'''
|| ';'
FROM DBA_USERS_WITH_DEFPWD a,
(SELECT DISTINCT version
FROM PRODUCT_COMPONENT_VERSION) b
WHERE version != '12.1.0.2.0';
spool off
#user.sql