oracle - 对象和记录类型之间的区别

Question

我只是好奇oracle中的对象和记录类型之间有什么区别，更具体地说是在以下声明之间

create type emp2_oty is object 
(
 empno  number,
 ename  varchar2(20),
 deptno number
);

create type emp2_nt is table of emp2_oty;

和

type emp2_oty is record
(
 empno  number,
 ename  varchar2(20),
 deptno number
);

create type emp2_nt is table of emp2_oty;

请详细说明。

Answer 1

• record:

     Cannot be stored in the database.
     Cannot be recursively referenced.
     Cannot have logic defined as part of their definition.
  

• object:

     Can be stored as a database table column or as an entire row.
     Can be recursively referenced using the SELF parameter.
     Can have logic defined as part of their definition using member methods.
  

Answer 2

OBJECT 类型可以存储在数据库中，可以在 SQL 和 PL/SQL 中使用