对象和记录类型之间的区别

Question

我只是好奇了oracle中对象和记录类型之间的区别,更具体地说,在下面的声明之间

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

• 记录:

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

• 宾语:

     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