Question

我对PL SQL世界有了新的认识......并且无法找到我的问题的答案......所以这里是：

create or replace 
TYPE "A" as object{
school_category  varchar(10);
}

create or replace 
TYPE "B" UNDER A {
school_name varchar(10);
school_ranking INTEGER;
}

我的问题： 1.如何初始化B类对象，并初始化其父对象的属性？ 2.无论如何，在创建对象时是否明确地为属性赋值？例如，我们有这样的事情：

B_obj B：= B（学校名称：=＆＃34;示例＆＃34;，school_ranking：=＆＃34; 1＆＃34;，school_category：=＆＃34;小学＆＃34;）;

先谢谢你们......

Answer 1

CREATE TYPE address_typ AS OBJECT ( 
   street          VARCHAR2(30),
   city            VARCHAR2(20),
   state           CHAR(2),
   postal_code     VARCHAR2(6) );
/
CREATE TYPE employee_typ AS OBJECT (
  employee_id       NUMBER(6),
  first_name        VARCHAR2(20),
  last_name         VARCHAR2(25),
  email             VARCHAR2(25),
  phone_number      VARCHAR2(20),
  hire_date         DATE,
  job_id            VARCHAR2(10),
  salary            NUMBER(8,2),
  commission_pct    NUMBER(2,2),
  manager_id        NUMBER(6),
  department_id     NUMBER(4),
  address           address_typ,
  MAP MEMBER FUNCTION get_idno RETURN NUMBER,
  MEMBER PROCEDURE display_address ( SELF IN OUT NOCOPY employee_typ ) );
/

DECLARE
  emp employee_typ; -- emp is atomically null
BEGIN
-- call the constructor for employee_typ
  emp := employee_typ(315, 'Francis', 'Logan', 'FLOGAN',
        '555.777.2222', '01-MAY-04', 'SA_MAN', 11000, .15, 101, 110, 
         address_typ('376 Mission', 'San Francisco', 'CA', '94222'));
  DBMS_OUTPUT.PUT_LINE(emp.first_name || ' ' || emp.last_name); -- display details

END;
/

有关详细信息，请参阅Oracle doc：https://docs.oracle.com/cd/B19306_01/appdev.102/b14261/objects.htm

在PL SQL中初始化用户定义的类型属性

1 个答案: