本篇内容主要讲解“怎么理解数据库包和包体的删除语法”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“怎么理解数据库包和包体的删除语法”吧!
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
到此，相信大家对“怎么理解数据库包和包体的删除语法”有了更深的了解，不妨来实际操作一番吧！这里是亿速云网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
