刚看到abap的结构体时，感觉它和其它的语言没有什么分别。但是看到include的用法时，我服了，因为很多书都是一笔带过。
include 的主要作用是实现结构体的继承关系,详见如下例子：
"人员结构休类型
TYPES : BEGIN OF personinfo , sid TYPE string, name TYPE string, END OF personinfo."员工信息类型 TYPES : BEGIN OF staffinfo , email TYPE string. INCLUDE TYPE personinfo AS pinfo . TYPES END OF staffinfo.
通过INCLUDE, staffinfo继承了personinfo的字段。
注意此时的BEGIN OF 和 END OF，都是以"."结束的，是一个完整的语句。中间包含的INCLUDE子句也是完整的语句。其自身的字段，则是BEGIN OF 或 TYPES END OF的组成部分。
因此如下形式也是正确的：
"员工信息类型
TYPES : BEGIN OF staffinfo . INCLUDE TYPE personinfo AS pinfo . TYPES : email TYPE string, END OF staffinfo."员工信息类型
TYPES : BEGIN OF staffinfo , email TYPE string. INCLUDE TYPE personinfo AS pinfo . TYPES : age type i , END OF staffinfo .DATA luke TYPE staffinfo .
luke- sid = '532525198504040913' . luke- name = 'luke' . luke- email = 'luke@sap.com' . WRITE : / , luke- sid ,luke - name, luke -email . WRITE : / , luke- pinfo -sid , luke- pinfo -name , luke- email . 这咱语法也是正确的。考虑一种场景,同时包括相同的类型多次：
"员工信息类型
TYPES : BEGIN OF staffinfo , email TYPE string. INCLUDE TYPE personinfo AS pinfo1 .INCLUDE TYPE personinfo AS pinfo2 .
TYPES : age type i , END OF staffinfo .
此时 luke- sid 将出现语法错误.解决方案：RENAMING WITH SUFFIX 选项，为其加上后缀。
"员工信息类型
TYPES : BEGIN OF staffinfo , email TYPE string. INCLUDE TYPE personinfo AS pinfo1 RENAMING WITH SUFFIX _pinfo1 . INCLUDE TYPE personinfo AS pinfo2 RENAMING WITH SUFFIX _pinfo2 . TYPES : age type i , END OF staffinfo . DATA luke TYPE staffinfo . luke- sid_pinfo1 = '532525198504040913' . luke- name_pinfo1 = 'luke' . luke- sid_pinfo2 = '532525198504040913_pinfo2' . luke- name_pinfo2 = 'luke2' . luke- email = 'luke@sap.com' . WRITE : / , luke- sid_pinfo1 ,luke - sid_pinfo2, luke -name_pinfo1 , luke- email .以上部分是使用types声明的，也可以换成data关键字
"人员结构休类型
types : begin of PersonInfo , SID type string, Name type string, end of PersonInfo. "员工信息类型 data : BEGIN OF staffinfo , email TYPE string. INCLUDE type PersonInfo as pInfo RENAMING WITH SUFFIX _pinfo . data : age type i , END OF staffinfo . DATA luke like staffinfo . luke- sid_pinfo = '532525198504040913' . luke- name_pinfo = 'luke' . luke- pInfo- sid ='' . luke- email = 'luke@sap.com' .或
"人员结构休类型
data : begin of PersonInfo , SID type string, Name type string, end of PersonInfo. "员工信息类型 data : BEGIN OF staffinfo , email TYPE string. INCLUDE structure PersonInfo as pInfo RENAMING WITH SUFFIX _pinfo. data : age type i , END OF staffinfo . DATA luke like staffinfo . luke- sid_pinfo = '532525198504040913' . luke- name_pinfo = 'luke' . luke- pInfo- sid ='' . luke- email = 'luke@sap.com' .Structure还可以嵌套其它Structure，如下：
"员工信息类型
data : BEGIN OF staffinfo , BEGIN OF birthday , Date type d , time type t , END OF birthday , email TYPE string. INCLUDE type PersonInfo as pInfo RENAMING WITH SUFFIX _pinfo . data : age type i , END OF staffinfo . DATA luke like staffinfo . luke- sid_pinfo = '532525198504040913' . luke- name_pinfo = 'luke' . luke- pInfo- sid ='' . luke- email = 'luke@sap.com' . luke- birthday- Date ='20120101' .
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