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Oracle PL/SQL/Object Oriented Database/treat - История изменений
2026-05-24T06:07:07Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:19Z
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Admin: 1 версия
2010-05-26T10:02:38Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Treat type as==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL><br />
SQL> create or replace<br />
2 type person as object (<br />
3 first_name varchar2(100),<br />
4 last_name varchar2(100),<br />
5 dob date,<br />
6 phone varchar2(100),<br />
7 member function get_last_name return varchar2,<br />
8 member function get_phone_number return varchar2 )<br />
9 not final<br />
10 /<br />
Type created.<br />
SQL><br />
SQL><br />
SQL> create or replace<br />
2 type body person as<br />
3 member function get_last_name return varchar2 is<br />
4 begin<br />
5 return self.last_name;<br />
6 end;<br />
7 member function get_phone_number return varchar2 is<br />
8 begin<br />
9 return self.phone;<br />
10 end;<br />
11 end;<br />
12 /<br />
Type body created.<br />
SQL><br />
SQL> create table person_table( p person );<br />
Table created.<br />
SQL><br />
SQL><br />
SQL><br />
SQL> create or replace<br />
2 type new_employee under person (<br />
3 empno number,<br />
4 hiredate date,<br />
5 work_phone varchar2(100),<br />
6 overriding member function get_phone_number return varchar2,<br />
7 member function get_home_phone_number return varchar2 )<br />
8 not final<br />
9 /<br />
Type created.<br />
SQL><br />
SQL> create or replace<br />
2 type body new_employee as<br />
3 overriding member function get_phone_number return varchar2 is<br />
4 begin<br />
5 return self.work_phone;<br />
6 end;<br />
7 member function get_home_phone_number return varchar2 is<br />
8 begin<br />
9 return self.phone;<br />
10 end;<br />
11 end;<br />
12 /<br />
Type body created.<br />
SQL><br />
SQL><br />
SQL> select treat( x.p as new_employee ).empno empno,<br />
2 x.p.last_name last_name<br />
3 from person_table x<br />
4 where p is of ( new_employee )<br />
5 /<br />
no rows selected<br />
SQL><br />
SQL> select * from person_table;<br />
no rows selected<br />
SQL><br />
SQL> drop table person_table;<br />
Table dropped.<br />
SQL><br />
SQL> drop type new_employee;<br />
Type dropped.<br />
SQL><br />
SQL> drop type person;<br />
Type dropped.<br />
SQL><br />
SQL><br />
</source><br />
<br />
<br />
<br />
<br />
==Use treat to convert varible to a type in select statement==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL><br />
SQL><br />
SQL> create or replace<br />
2 type person as object (<br />
3 first_name varchar2(100),<br />
4 last_name varchar2(100),<br />
5 dob date,<br />
6 phone varchar2(100),<br />
7 member function get_last_name return varchar2,<br />
8 member function get_phone_number return varchar2 )<br />
9 not final<br />
10 /<br />
Type created.<br />
SQL><br />
SQL><br />
SQL> create or replace<br />
2 type body person as<br />
3 member function get_last_name return varchar2 is<br />
4 begin<br />
5 return self.last_name;<br />
6 end;<br />
7 member function get_phone_number return varchar2 is<br />
8 begin<br />
9 return self.phone;<br />
10 end;<br />
11 end;<br />
12 /<br />
Type body created.<br />
SQL><br />
SQL> create table person_table( p person );<br />
Table created.<br />
SQL><br />
SQL> select treat( p as person).get_last_name() from person_table p;<br />
no rows selected<br />
SQL><br />
SQL> drop table person_table;<br />
Table dropped.<br />
SQL><br />
SQL> drop type person;<br />
Type dropped.<br />
SQL><br />
</source></div>
Admin