http://www.itpub.net/thread-1499223-12-1.html 116楼 我创建了这个小工具程序来显示一个指定对象的状态：
CREATE OR REPLACE PROCEDURE plch_show_status ( object_name_in IN VARCHAR2 , type_in IN VARCHAR2) IS l_status user_objects.status%TYPE; BEGIN SELECT ob.status INTO l_status FROM user_objects ob WHERE object_name = object_name_in AND object_type = type_in; DBMS_OUTPUT.put_line ( type_in || ' ' || object_name_in || ': ' || l_status); EXCEPTION WHEN NO_DATA_FOUND THEN DBMS_OUTPUT.put_line ( type_in || ' ' || object_name_in || ': UNDEFINED'); END; /
我又创建了这个包：
CREATE OR REPLACE PACKAGE plch_pkg IS PROCEDURE do_stuff; END; / CREATE OR REPLACE PACKAGE BODY plch_pkg IS PROCEDURE do_stuff IS BEGIN NULL; END; END; /
我执行了下列选项中的语句之后再执行这个块：
BEGIN
plch_show_status ('PLCH_PKG', 'PACKAGE');
plch_show_status ('PLCH_PKG', 'PACKAGE BODY');
END;
/
哪些选项会产生这两行输出？
PACKAGE PLCH_PKG: UNDEFINED PACKAGE BODY PLCH_PKG: UNDEFINED
(A)
DROP PACKAGE SPECIFICATION plch_pkg / DROP PACKAGE BODY plch_pkg /
SQL> DROP PACKAGE SPECIFICATION plch_pkg
2 /
DROP PACKAGE SPECIFICATION plch_pkg
ORA-00933: SQL 命令未正确结束
SQL> DROP PACKAGE BODY plch_pkg
2 /
Package body dropped
SQL>
SQL> BEGIN
2 plch_show_status ('PLCH_PKG', 'PACKAGE');
3 plch_show_status ('PLCH_PKG', 'PACKAGE BODY');
4 END;
5 /
PACKAGE PLCH_PKG: VALID
PACKAGE BODY PLCH_PKG: UNDEFINED
PL/SQL procedure successfully completed
SQL>
(B)
DROP PACKAGE plch_pkg / DROP PACKAGE BODY plch_pkg /
SQL> DROP PACKAGE plch_pkg
2 /
Package dropped
SQL> DROP PACKAGE BODY plch_pkg
2 /
DROP PACKAGE BODY plch_pkg
ORA-04043: 对象 PLCH_PKG 不存在
SQL>
SQL>
SQL> BEGIN
2 plch_show_status ('PLCH_PKG', 'PACKAGE');
3 plch_show_status ('PLCH_PKG', 'PACKAGE BODY');
4 END;
5 /
PACKAGE PLCH_PKG: UNDEFINED
PACKAGE BODY PLCH_PKG: UNDEFINED
PL/SQL procedure successfully completed
SQL>
(C)
DROP PACKAGE SPECIFICATION AND BODY plch_pkg /
SQL> DROP PACKAGE SPECIFICATION AND BODY plch_pkg
2 /
DROP PACKAGE SPECIFICATION AND BODY plch_pkg
ORA-00933: SQL 命令未正确结束
SQL>
SQL>
SQL> BEGIN
2 plch_show_status ('PLCH_PKG', 'PACKAGE');
3 plch_show_status ('PLCH_PKG', 'PACKAGE BODY');
4 END;
5 /
PACKAGE PLCH_PKG: VALID
PACKAGE BODY PLCH_PKG: VALID
PL/SQL procedure successfully completed
SQL>
(D)
DROP PACKAGE plch_pkg /
SQL> DROP PACKAGE plch_pkg
2 /
Package dropped
SQL>
SQL>
SQL> BEGIN
2 plch_show_status ('PLCH_PKG', 'PACKAGE');
3 plch_show_status ('PLCH_PKG', 'PACKAGE BODY');
4 END;
5 /
PACKAGE PLCH_PKG: UNDEFINED
PACKAGE BODY PLCH_PKG: UNDEFINED
PL/SQL procedure successfully completed
SQL>
答案BD
