【ABAP】结构体嵌套声明的几种方式

**********************************************************************
TYPES:BEGIN OF typ_address,
        country(50) TYPE c,
        city(100)   TYPE c,
        street(100) TYPE c,
      END OF typ_address.

TYPES:BEGIN OF typ_emp,
        empNo(50)    TYPE c,
        empName(100) TYPE c,
        address      TYPE typ_address,
      END OF typ_emp.

DATA: gt_emp TYPE TABLE OF typ_emp,
      gs_emp TYPE typ_emp.

gs_emp-empNo = '10031000'.
gs_emp-empName = 'Tom'.
gs_emp-address-country = 'CN'.
gs_emp-address-city = 'BJ'.

APPEND gs_emp TO gt_emp.

gs_emp-empNo = '10031001'.
gs_emp-empName = 'Jim'.
gs_emp-address-country = 'CN'.
gs_emp-address-city = 'BJ'.

APPEND gs_emp TO gt_emp.

**********************************************************************
types:BEGIN OF typ_address03,
       country(50) TYPE c,
       city(100)   TYPE c,
       street(100) TYPE c,
     END OF typ_address03.

DATA:BEGIN OF  gs_emp03.
       INCLUDE type typ_address03 AS address.
DATA:  empNo(50)    TYPE c,
       empName(100) TYPE c,
     END OF gs_emp03.

DATA:gt_emp03 LIKE TABLE OF  gs_emp03.

gs_emp03-empNo = '10031990'.
gs_emp03-empName = 'Jack'.
gs_emp03-address-country = 'CN'.
APPEND gs_emp03 TO gt_emp03.

**********************************************************************
DATA:BEGIN OF gs_address01,
       country(50) TYPE c,
       city(100)   TYPE c,
       street(100) TYPE c,
     END OF gs_address01.

DATA:BEGIN OF  gs_emp01,
       address      LIKE    gs_address01,
       empNo(50)    TYPE c,
       empName(100) TYPE c,
     END OF gs_emp01.

DATA:gt_emp01 LIKE TABLE OF  gs_emp01.

gs_emp01-empNo = '10031990'.
gs_emp01-empName = 'Jack'.
gs_emp01-address-country = 'CN'.
APPEND gs_emp01 TO gt_emp01.
**********************************************************************
DATA:BEGIN OF gs_address02,
       country(50) TYPE c,
       city(100)   TYPE c,
       street(100) TYPE c,
     END OF gs_address02.

DATA:BEGIN OF  gs_emp02.
       INCLUDE STRUCTURE gs_address02 AS address.
DATA:  empNo(50)    TYPE c,
       empName(100) TYPE c,
     END OF gs_emp02.

DATA:gt_emp02 LIKE TABLE OF  gs_emp02.

gs_emp02-empNo = '10031990'.
gs_emp02-empName = 'Jack'.
gs_emp02-address-country = 'CN'.
APPEND gs_emp02 TO gt_emp02.