Oracle对象类型详解

抽象数据类型
1、创建类型
--地址类型
CREATE OR REPLACE TYPE AddressType AS OBJECT
(
Country varchar2(15),
City varchar2(20),
Street varchar2(30)
);
2、类型嵌套
--创建基于前一个类型的新的抽象数据类型：巨星类型
CREATE OR REPLACE TYPE SuperStarType AS OBJECT
(
StarName varchar2(30),
Address AddressType
);
3、基于抽象类型创建关系表
CREATE TABLE SuperStar
(
StarID varchar(10),
Star SuperStarType
);
4、基于抽象类型创建对象表
CREATE TABLE SuperStarObj of SuperStarType;
5、使用构造方法在表中插入记录
INSERT INTO SuperStar VALUES(''001'',SuperStarType(''Zidane'',AddressType(''France'',''Paris'',''People Street NO.1'')));
6、查询表中记录
（1）SQL> SELECT * from SuperStar;
STARID
----------
STAR(STARNAME, ADDRESS(COUNTRY, CITY, STREET))
--------------------------------------------------------------------------------
001
SUPERSTARTYPE(''Zidane'', ADDRESSTYPE(''France'', ''Paris'', ''People Street NO.1''))
（2）
SELECT s.StarID,s.Star.StarName,s.Star.Address.Country,s.Star.Address.City,s.Star.Address.Street from SuperStar s
STARID STAR.STARNAME STAR.ADDRESS.CO STAR.ADDRESS.CITY STAR.ADDRESS.STREET
---------- ------------------------------ --------------- -------------------- ---------------------
001 Zidane France Paris People Street NO.1
7、抽象数据类型的继承
（1）创建一个类型
CREATE OR REPLACE TYPE PersonType AS OBJECT
(
PersonName varchar(10),
PersonSex varchar(2),
PersonBirth date
) not final;
(2)派生一个类型
CREATE OR REPLACE TYPE StudentType UNDER PersonType
(
StudentNO int,
StudentScore int
);
(3)查看数据字典
SQL> DESC StudentType
StudentType extends SYS.PERSONTYPE
Name
------------------------------------------------------------------------------
PERSONNAME
PERSONSEX
PERSONBIRTH
STUDENTNO
STUDENTSCORE
(4)创建对象表
CREATE TABLE student OF StudentType;
(5)向对象表中插入数据
INSERT INTO student VALUES(''Rose'',''nv'',to_date(''1983-05-02'',''yyyy-mm-dd''),1001,98);
(6) 查询数据
SQL> SELECT * f