【IT168 技术文章】

    1、AT New事件触发说明

    如 AT New f.
    f 是内表的一个字段，当f字段或者f字段左边的字段内容发生变化是该事件后面的语句都会执行。

    TYPES: BEGIN OF COMPANIES_TYPE,
            NAME(30),
            PRODUCT(20),
            SALES TYPE I,
          END   OF COMPANIES_TYPE.

    DATA: COMPANIES TYPE STANDARD TABLE OF COMPANIES_TYPE WITH
                         NON-UNIQUE DEFAULT KEY INITIAL SIZE 20,
          WA_COMPANIES TYPE COMPANIES_TYPE.

    ...

    LOOP AT COMPANIES INTO WA_COMPANIES.
      AT NEW PRODUCT.
        NEW-PAGE.
        WRITE / WA_COMPANIES-NAME WA_COMPANIES-PRODUCT.
      ENDAT.
      WRITE: / WA_COMPANIES-PRODUCT, WA_COMPANIES-SALES.
      AT END OF NAME.
        SUM.
        WRITE: / WA_COMPANIES-NAME, WA_COMPANIES-SALES.
      ENDAT.
    ENDLOOP.

    这个样例当name变化时，AT new事件也会执行。

    2、AT New 发生时工作区的字段的值

    All character type fields (on the right) are filled with "*" after the current control level key.

    All other fields (on the right) are set to their initial values after the current control level key.