七、新语法补充

新语法

示例

等价于/说明

DATA

（1）DATA(TEXT) = ‘ABCDE’.

（2）LOOP AT ITAB INTO DATA(WA).

         ……

     ENDLOOP.

（1）DATA TEXT TYPE STRING.

TEXT = ‘ABCDE’.

（2）DATA WA LIKE LINE OF ITAB.

LOOP AT ITAB INTO WA.

……

ENDLOOP.

COND

LV_STR = COND #(WHEN LV_STR IS INITIAL THEN ‘ABCDE’ ELSE LV_STR).

IF LV_STR IS INITIAL.

       LV_STR = ‘ABCDE’.

ELSE.

       LV_STR = ‘ ‘.

ENDIF.

SWITCH

LV_STR = SWITCH #( N WHEN 1 THEN ‘ABCDE‘ WHEN 2 THEN ‘FGHTL).

CASE N.

   WHEN 1.

      LV_STR = ‘ABCDE’.

   WHEN 2.

      LV_STR = ‘FGHTL’.

   WHEN OTHERS.

      LV_STR = ‘ ‘.

ENDCASE.

VALUE

ITAB= VALUE #( ( ID = 1 NAME = ‘LILI’)

               (ID = 2 NAME = ‘LIMI)).

TYPES:BEGIN OF TY_ITAB,

        ID TYPE I,

        NAME TYPE STRING,

       END OF TY_ITAB.

DATA:ITAB TYPE TABLE OF TY_ITAB.

再赋值

FOR

DATA(ITAB2) = VALUE ITAB2(FOR WA IN ITAB1 WHERE ( ID  < 50 ) ( ID = WA-ID NAME = WA-NAME AGE = WA-AGE )).

加强版的LOOP AT，可用于填充内表、根据条件汇总、计算等操作

REDUCE

DATA( SUM ) = REDUCE I( INIT X = 0 FOR WA IN ITAB NEXT X = X+WA-AGE ).

可用于汇总计算

CONV

LV_STR = ‘001024.012’.

LV_INT = CONV I( LV_STR ).

数据类型转换，不需要中间变量

CORRESPONDING

STRUCT2 = CORRESPONDING #( STRUCT1 ).

用于实现结构和内表之间的动态赋值操作

GROUP BY

LOOP AT ITAB ASSIGNING FIELD-SYMBOL(<FS_ITAB>) GROUP BY <FS_ITAB>-ID.

相当于SQL中的GROUP BY，用于内表处理

FELTER

DATA( ITAB1 ) = FILTER #( ITAB USING KEY ID)单值过滤

DATA( ITAB2 ) = FILTER #( ITAB USING KEY ID WHERE AGE = CONV #( TO_UPPER( AGE )))多值过滤

过滤，可以指定一个或多个值进行过滤