内表使用方法总结之二----常用方法

一、读取

一般格式：READ TABLE itab FROM WITH KEY k1 = f1 ... ki = fi　INTO wa.

                    READ TABLE itab FROM WITH TABLE KEY k1 = f1 ... ki = fi    INTO wa.

                   READ TABLE itab FROM FROM KEY k1 = f1 ... ki = fi    INTO wa.

                  READ TABLE itab INTO wa INDEX idx.

目前我常用如下方法来读取：

*读取满足条件的一个值*
READ TABLE itab_compare INTO wa_compare WITH KEY matnr = wa_sj-matnr dfmark = ''.
IF sy-subrc NE 0.
“读不到＂
Endif.

*读取满足条件的多个值*
LOOP AT itab_compare INTO wa_compare WHERE matnr = wa_sj-matnr AND ysyamount NE 0.
ENDLOOP.
IF sy-subrc NE 0.
“Loop 不到＂
Endif.
 
注意，读不到，不会清除wa_compare,所以最好手动清楚

 

二、清空内表:

Clear itab.   清空表头

Clear itab[] 清空表身

Refresh itab. 清空表身

Free itab.    清空表头和表身,并释放内存

 

三、删除内表行

Delete itab index idx.

Delete table itab from wa.

Delete table itab with table key k1 = f1…ki = fi.

 

例:在Loop中常这样删除行.

Loop at itab into wa_itab.

DELETE ITAB INDEX SY-TABIX.

(或DELETE ITAB.说明:Loop/EndLoop之间,Modify Delete的sy-tabix可省略,系统默认处理当前行)

Clear wa_itab.

Endloop.