如何动态删除Oracle中的package或procedure

create PACKAGE PKG_RS_SAMPLE_DROP AS
TYPE ROSSCURSOR IS REF CURSOR;

PROCEDURE PKG_RS_SAMPLE_DROP_RPOCEDURE
(
DBMS_OUTPUT.PRINT('yes');
);
END PKG_RS_SAMPLE_DROP;

declare package_count int;
begin

SELECT
  count(OBJECT_NAME) into package_count
FROM
  USER_PROCEDURES
WHERE
  OBJECT_TYPE='PACKAGE' AND OBJECT_NAME='PKG_RS_SAMPLE_DROP';
 
if
  package_count > 0
then
  　　execute  immediate 'drop package PKG_RS_SAMPLE_DROP';
end if;

end;