--Program   : drops.sql 
--Purpose   : To find and drop a list of user tables that match a given criteria
--Usage     : SQL>@drops
--Notes     : Prompts for a string and then searches all objects name to be dropped.The default option is to drop all tables.
--            It then searches and displays the selected objects and then prompts for a confirmation which defaults to a 'No'.
--            The script generates a number of files, thus it is important that the user must have a write privilege to the
--            current directory.The files are as follows
--     
--            Drops Command File: DROP_UserName_ObjectName_SessionIDSystemDateTime.sql
--            Drops Log     File: DROP_UserName_ObjectName_SessionIDSystemDateTime.dropslog
--            Temp  Drops   File: drops1.sql -- deleted at the end
--            Temp  Drops   File: drops2.sql -- deleted at the end
--            SQL*Plus Env  File: drops.saveset -- deleted at the end
--
--Example   : SQL>@drops
--            Enter Table Name To Drop [ALL]: EMP     -- will drop all tables with names containing the expression 'EMP'
--Author    : Ram Razdan , ramrazdan@yahoo.com
--License   : Free for public use, amendment and distribution.
--            Please refer https://ramrazdan.tripod.com/termsofuse.txt for full details.
--Revision  : Version        Date        Server/OS        Comments
--            1.0            Dec,1997    Oracle7.1/VM-CMS Initial Revision.
--            1.1            Aug,1998    Oracle7.3/SunOS  Prompt for confirmation and clean up temp files at the end.
--            2.0            Apr,2001    Oracle8.1/Win98  Extend the ability to drop all types objects (initial versions
--                                                        worked only on tables. Also provide logging ability and the 
--                                                        option to generate a unique command file which may be stored for
--                                                        later use.
--
SET ECHO OFF
--STORE SET saveset
SET PAGESIZE 0 FEEDBACK OFF HEADING OFF TERMOUT ON VERIFY OFF LINESIZE 132
UNDEFINE v_object_name
ACCEPT   v_object_name CHAR PROMPT 'Enter Object Name To Drop [ALL]:'
VARIABLE v_drops_cmd_file_name VARCHAR2(256)
-- drop command filename DROP_$LESSUSERNAME_ObjectSearchString_SessionIDSystemDateTime
-- example               DROP_OPS_RRAZDAN_EMP_12345620010501230101.sql
BEGIN
         :v_drops_cmd_file_name := 'DROP_'||
                                   TRANSLATE(USER,'$','_')||'_'||
                                   NVL(TRANSLATE('&v_object_name'
                                                ,'%?¬!"£$^&*()-+={}[]:;@''~#|\/?,.<> ``'
                                                ,'__'  -- strip everything except %? which are translated to _
                                                )
                                      ,'ALL'
                                      )||'_'||
                                   USERENV('SESSIONID')||
                                   TO_CHAR(SYSDATE,'YYYYMMDDHH24MISS');
END;
/
SET SERVEROUTPUT ON
EXECUTE DBMS_OUTPUT.PUT_LINE(:v_drops_cmd_file_name||'.sql');
SET SERVEROUTPUT OFF
SET TERMOUT OFF
SPOOL drops1.sql
SELECT 'SPOOL '||:v_drops_cmd_file_name||'.sql'
  FROM DUAL
;
SPOOL OFF
SET TERMOUT ON
@drops1
SELECT 'REM MULTIPLE OBJECTS DROP FILE CREATED FILE BY USER '||USER||
       ', UID '||UID||', SESSIONID '||USERENV('SESSIONID')||' AT '||TO_CHAR(SYSDATE,'DD-MON-YYYY HH24:MI:SS')
  FROM DUAL
;
SELECT 'SPOOL '||:v_drops_cmd_file_name||'.dropslog'
  FROM DUAL
UNION ALL
SELECT 'SHOW USER' 
  FROM DUAL
UNION ALL
SELECT 'STORE SET drops.saveset'
  FROM V$VERSION
 WHERE ROWNUM = 1
   AND INSTR(BANNER,'Release 8.') > 0
UNION ALL
SELECT 'SET ECHO ON TIME ON TIMING ON  FEEDBACK ON FEEDBACK 1 HEADING ON PAUSE OFF' 
  FROM DUAL
;
SELECT 'DROP '||RPAD(object_type,18,' ')||' '||object_name||';' 
  FROM USER_OBJECTS
 WHERE object_name LIKE UPPER('%&v_object_name%')
 ORDER BY object_type -- may be removed if performance is being hit.
;
SELECT 'SET ECHO OFF TIME OFF TIMING OFF FEEDBACK ON FEEDBACK 5 HEADING ON PAUSE OFF' 
  FROM DUAL
UNION ALL
SELECT '@@drops.saveset'
  FROM V$VERSION
 WHERE ROWNUM = 1
   AND INSTR(BANNER,'Release 8.') > 0
UNION ALL
SELECT 'SPOOL OFF'
  FROM DUAL
;
SPOOL OFF
--SET TERMOUT ON
--SELECT RPAD(object_type,19,' ')||RPAD(object_name,30,' ')||'...Selected to drop.' 
--  FROM USER_OBJECTS
-- WHERE object_name LIKE UPPER('%&v_object_name%')
--;
SELECT TO_CHAR(COUNT(*))||' Objects will be dropped.' 
  FROM USER_OBJECTS
 WHERE object_name LIKE UPPER('%&v_object_name%')
;
ACCEPT v_yn CHAR PROMPT 'Confirm Drop (Y|[N]) ?'
SET TERMOUT OFF
SPOOL drops2.sql
SELECT DECODE('&v_yn'
             ,'Y','@drops1.sql'
             ,'N','SET ECHO OFF'
             ,NULL,'SET ECHO OFF'
             ,'SET ECHO OFF')
  FROM SYS.DUAL
;
SPOOL OFF
@drops2.sql
SET TERMOUT ON
SELECT DECODE('&v_yn'
             ,'Y','Selected Objects(s) Dropped.'
             ,'N','Selected Objects(s) Not Dropped'
             ,NULL,'Selected Objects(s) Not Dropped'
             ,'Selected Objects(s) Not Dropped')
FROM SYS.DUAL
;
SET PAGESIZE 50 FEEDBACK ON FEEDBACK 5 HEADING ON ECHO OFF TERMOUT ON LINESIZE 132
--The following code is optional and OS dependent
--Use rm to remove temp files on UNIX
--HO rm  drops1.sql
--HO rm  drops2.sql
--HO rm  drops.saveset
--Use erase/del to remove temp files on Windows
HO del  drops1.sql
HO del  drops2.sql
HO del  drops.saveset
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