十八、SAP中使用IF/ELSE判断语句，以及sy-subrc的用法

*&---------------------------------------------------------------------*
*& Report Z_TIANPAN_20190716_HELLO
*&---------------------------------------------------------------------*
*&
*&---------------------------------------------------------------------*

* 此条为系统自动生成，为程序名
REPORT Z_TIANPAN_20190716_HELLO.

* 定义一个结构体
TYPES: BEGIN OF ty_spfli,
  carrid TYPE spfli-carrid,
  connid TYPE spfli-connid,
  countryfr TYPE spfli-countryfr,
  cityfrom TYPE spfli-cityfrom,
  cityto TYPE spfli-cityto,
  END OF ty_spfli.

* 声明结构体变量
DATA m_spfli TYPE ty_spfli.

* 写数据库语句, CORRESPONDING FIELDS OF可以将一样类型进行赋值
SELECT SINGLE * FROM spfli INTO CORRESPONDING FIELDS OF m_spfli
  WHERE carrid = ‘AC‘ AND connid = ‘8888‘.

* sy_subrc为上一条语句的执行结果，如果为0，则表示执行成功
IF sy-subrc = 0 .
  WRITE: m_spfli-carrid, m_spfli-connid, m_spfli-countryfr, m_spfli-cityfrom,m_spfli-cityto .
ELSE.
  WRITE: ‘没有找到数据！‘ .
ENDIF.