FILTER是ABAP中的一个关键字,用于在外部表中进行数据筛选和过滤,以便于提取所需的数据集。

FILTER关键字用于从外部表中筛选合乎特定条件的数据行。它通过提供条件表达式,只返回满足条件的数据行,从而在不批改原始数据的状况下生成一个新的外部表。FILTER关键字在解决大量数据时十分有用,能够无效地缩小外部表的大小,同时进步代码的可读性和可维护性。

REPORT ZJERRY_FILTER.DATA: lt_spfli TYPE STANDARD TABLE OF spfli       WITH NON-UNIQUE SORTED KEY carr_city COMPONENTS carrid,      lt_lh TYPE TABLE OF spfli.SELECT * INTO TABLE lt_spfli FROM spfli."data(lt) = FILTER #( lt_spfli using key carrid where carrid = '1' ).lt_lh = FILTER #( lt_spfli using key carr_city where carrid = conv #( 'LH' ) ).BREAK-POINT.

filter 之前:

filter 之后:

第二个例子:

report z.TYPES: BEGIN OF ty_person,           name type string,           age type int4,      end of ty_person.data: lt_person type STANDARD TABLE OF ty_person                        with NON-UNIQUE SORTED KEY person_key COMPONENTS age,      lt_old1 like lt_person,      lt_old2 like lt_person,      ls_person type ty_person.ls_person-name = 'Tom'. ls_person-age = '21'. INSERT ls_person into table lt_person.ls_person-name = 'Jim'. ls_person-age = '62'. INSERT ls_person into table lt_person.ls_person-name = 'Bob'. ls_person-age = '70'. INSERT ls_person into table lt_person.ls_person-name = 'Kate'. ls_person-age = '30'. INSERT ls_person into table lt_person.LOOP AT lt_person INTO ls_person WHERE age > 60.   INSERT ls_person INTO TABLE lt_old1.ENDLOOP.lt_old2 = FILTER #( lt_person USING KEY person_key where age > 60 ).IF lt_old1 = lt_old2.   BREAK-POINT.ENDIF.

总结

FILTER关键字是SAP ABAP中用于数据筛选和过滤的弱小工具。它容许开发人员依据特定条件从外部表中提取所需的数据,从而简化了数据处理过程,进步了代码的可读性和可维护性。通过上述示例,咱们能够看到FILTER关键字在理论开发中的利用,以及如何应用它来从员工信息中筛选出符合条件的数据。