首先要说明，SAP推荐将check用于循环中
1.check 用于循环中，如果条件不成立则结束下面的操作直接进入下一次循环
program:
DO 10 TIMES.
check sy-index between 4 and 7.
write: 'the index value is: ', sy-index.
ENDDO.
result:
the index value is: 4
the index value is: 5
the index value is: 6
the index value is: 7
2.check用于块中，如果条件不成立直接结束块
program:
parameters p_local type i default -1.
start-of-selection.
perform f_getdata.
perform f_dispaly_data.
end-of-selection.
*&---------------------------------------------------------------------*
*& Form F_GETDATA
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
* --> p1 text
* <-- p2 text
*----------------------------------------------------------------------*
form F_GETDATA .
check p_local eq 1.
write: / 'subroutine 1'.
endform. " F_GETDATA
*&---------------------------------------------------------------------*
*& Form F_DISPALY_DATA
*&---------------------------------------------------------------------*
* text
*----------------------------------------------------------------------*
* --> p1 text
* <-- p2 text
*----------------------------------------------------------------------*
form F_DISPALY_DATA .
write: / 'subroutine 2'.
endform. " F_DISPALY_DATA
result:
2
3.check 用于GET事件中
program:
NODES sflight.
SELECT-OPTIONS: s_max FOR sflight-seatsmax,
s_occ FOR sflight-seatsocc.
GET sflight.
WRITE: / sflight-carrid, sflight-connid.
CHECK SELECT-OPTIONS.
WRITE: sflight-seatsmax, sflight-seatsocc.
