一程序包的基本概念
程序包可将若干函数或者存储过程组织起来，作为一个对象进行存储。程序包通常由两部分构成，规范(specification)和主体(body)。程序报也可以包含常量和变量，包中的所有函数和存储过程都可以使用这些变量或者常量。
二 规范
1 创建规范(SQL窗口)
create or replace package pkg_staff as
staffString varchar2(500);
stafftAge number:=18;
function get_staff_string return varchar2;
procedure insert_staff(in_staff_id in number,in_staff_name in varchar2);
procedure update_staff(in_staff_id in number);
procedure delete_staff(in_staff_id in number);
end pkg_staff;
2 在数据字典中查看程序包规范的信息
select object_name,object_type,status from user_objects
where lower(OBJECT_NAME) = 'pkg_staff'
三 主体
1 创建主体
create or replace package body pkg_staff as
function get_staff_string return varchar2 as
begin
return 'staff';
end get_staff_string;
procedure insert_staff(in_staff_id in number,in_staff_name in varchar2) as
begin
insert into staff values (in_staff_id,in_staff_name);
end insert_staff;
procedure update_staff(in_staff_id in number) as
begin
update staff set name = 'xy' where num = in_staff_id;
end update_staff;
procedure delete_staff(in_staff_id in number) as
begin
delete from staff where num = '1';
end delete_staff;
end pkg_staff;
2 在数据字典中查看程序包主体的信息
select object_name,object_type,status from user_objects
where lower(OBJECT_NAME) = 'pkg_staff'
四调用程序包中的函数或者存储过程
调用函数(SQL window)
select pkg_staff.get_staff_string() as result from dual
调用存储过程(Command window)
begin
pkg_staff.delete_staff(1);
end;
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