GET DDL's of all objects in a database and drop it

******************************DROP ALL OBJECTS**************************
set pagesize 0
set verify off
set feedback off
spool drop_objects.sql

select 'drop '||object_type||' '|| object_name||  DECODE(OBJECT_TYPE,'TABLE',' CASCADE CONSTRAINTS;',';') from user_objects;

spool off;

******************************DROP ALL TABLES******************************

SELECT 'DROP TABLE &owner..' || TABLE_NAME || ' CASCADE CONSTRAINTS;' FROM DBA_TABLES WHERE OWNER=UPPER('&owner');


******************************DROP ALL INDEXES******************************

SELECT 'DROP INDEX &owner..' || INDEX_NAME || ' CASCADE CONSTRAINTS;' FROM ALL_INDEXES WHERE OWNER=UPPER('&owner');


******************************DROP ALL SYNONYMS******************************

SELECT 'DROP synonym &owner..' || SYNONYM_NAME || ' ;' FROM ALL_SYNONYMS WHERE OWNER=UPPER('&owner');


******************************REVOKE ALL GRANTS**********************************

SELECT 'revoke .' || grant || ' ;' FROM ALL_SYNONYMS WHERE OWNER=UPPER('&owner');