如何加入表 KNBK 和 TIBAN？

Question

我试图读取 table TIBAN 仅在 KNBK table 的字段 BANKN 包含字符串“IBAN”的情况下”。我遇到的问题是阅读 table TIBAN。对于 KNBK table 我使用关键字 kunnr 搜索 table，但 table TIBAN 不包含此字段。代码如下：

 LOOP AT lt_data_bsec ASSIGNING <ls_data_bsec>.

      READ TABLE lt_data_knbk ASSIGNING FIELD-SYMBOL(<ls_data_knbk>) 
            WITH KEY kunnr = <ls_data_bsec>-kunnr BINARY SEARCH .

      IF <ls_data_knbk>-bankn_kn CS '<IBAN>'.

      >>>>> READ TABLE lt_data_tiban ASSIGNING FIELD-SYMBOL(<ls_data_tiban>).

        IF <ls_data_bsec> IS ASSIGNED 
              AND <ls_data_tiban> IS ASSIGNED
              AND ( <ls_data_bsec>-banks_bs NE <ls_data_tiban>-banks_kn
                 OR <ls_data_bsec>-bankl_bs NE <ls_data_tiban>-bankl_kn
                 OR <ls_data_bsec>-bankn_bs NE <ls_data_tiban>-bankn_kn ).

        ENDIF.

lt_data_knbk table 的声明是：

SELECT kunnr,
           banks AS banks_kn,
           bankl AS bankl_kn,
           bankn AS bankn_kn
      FROM knbk
      INTO TABLE @DATA(lt_data_knbk)
      FOR ALL ENTRIES IN @lt_data_bsec
      WHERE kunnr = @lt_data_bsec-kunnr
      ORDER BY PRIMARY KEY.

而 lt_data_tiban 的声明是：

SELECT banks AS banks_tb,
           bankl AS bankl_tb,
           bankn AS bankn_tb
      FROM tiban
      INTO TABLE @DATA(lt_data_tiban).

lt_data_bsec 的声明也是 gty_out:

类型

BEGIN OF gty_out,
         bukrs    TYPE bukrs,
         belnr    TYPE belnr_d,
         buzei    TYPE buzei,
         budat    TYPE budat,
         kunnr    TYPE kunnr,
         banks_kn TYPE banks,
         bankl_kn TYPE bankk,
         bankn_kn TYPE bankn,
         banks_bs TYPE banks,
         bankl_bs TYPE bankk,
         bankn_bs TYPE bankn,
         banks_tb TYPE banks,
         bankl_tb TYPE bankk,
         bankn_tb TYPE bankn,
       END OF gty_out,

我在代码中标记的行中有一个错误，因为它需要一个关键字段来读取 table。

有人知道我需要什么类型的字段来搜索 TIBAN table，就像我搜索 KNBK table 一样吗？

Answer 1

我建议您使用 TIBAN LEFT OUTER JOIN 来获取您的银行数据。

SELECT knbk~kunnr AS kunnr,
       knbk~banks AS banks_kn,
       knbk~bankl AS bankl_kn,
       knbk~bankn AS bankn_kn,
       knbk~bkont AS bkont_kn,
       tiban~iban AS iban
  FROM knbk
  LEFT OUTER JOIN tiban ON
       tiban~banks = knbk~banks AND
       tiban~bankl = knbk~bankl AND
       tiban~bankn = knbk~bankn AND
       tiban~bkont = knbk~bkont
  INTO TABLE @DATA(lt_data_knbk)
  FOR ALL ENTRIES IN @lt_data_bsec
  WHERE knbk~kunnr = @lt_data_bsec-kunnr
  ORDER BY knbk~banks knbk~bankl knbk~bankn knbk~bkont.

结果将是一个 table，其中包含 KNBK 中的所有条目，加上一个字段 IBAN，如果存在相应的行，则该字段将从 TIBAN 中填充并且是当不存在相应行时初始。

现在您只需确定您是否拥有这样的 IBAN：

LOOP AT lt_data_knbk ASSIGNING FIELD-SYMBOL(<ls_data_knbk>).
   IF <ls_data_knbk>-iban IS INITIAL.
       " classic bank number + account number account
   ELSE.
       " IBAN account     
   ENDIF.
ENDLOOP.

Answer 2

你的任务是 ABAP CDS associations aka Lazy Join 发挥作用的完美案例。

如果您使用的是最新版本的 ABAP 并且能够创建 CDS，则没有什么可以阻止您创建这个

@AbapCatalog.sqlViewName: ‘ZCUST_TIBAN_SQL’
@AbapCatalog.compiler.compareFilter: true
@AccessControl.authorizationCheck: #CHECK
@EndUserText.label: ‘TIBAN’
 
define view ZCUST_TIBAN as select from knbk as cus
association [0..1] to tiban as _an 
                 on  cus.kunnr = _an.kunnr
                 and cus.banks = _an.banks
                 and cus.bankl = _an.bankl
                 and cus.bankn = _an.bankn
                 and cus.bkont = _an.bkont
{
       cus.kunnr,
       cus.banks AS banks_kn,
       cus.bankl AS bankl_kn,
       cus.bankn AS bankn_kn,
       cus.bkont AS bkont_kn,
       _iban~
} WHERE cus.bankn like '%IBAN%'

然后您可以在所有进一步的要求中使用此关联：

SELECT  banks_kn, bankl_kn, bankn_kn, bkont_kn
       \_iban-iban          AS IBAN,
       \_iban-valid_from    AS IBAN_validity
  FROM zcust_tiban
 WHERE kunnr IN @lr_customers
  INTO TABLE @DATA(lt_data_knbk).

...
READ TABLE lt_data_knbk ASSIGNING FIELD-SYMBOL(<ls_data_knbk>) 
        WITH KEY kunnr = <ls_data_bsec>-kunnr BINARY SEARCH.
...

需要注意的要点：

像上面那样具有 0..1 基数的关联不会进行实际的 JOIN，直到像上面 SELECT 中那样请求来自关联 table TIBAN 的字段。这比 Philipp 建议的 LEFT OUTER JOIN 方法更高效、更通用。
它是可重复使用的，可以作为源selects/associations进一步使用

如何加入表 KNBK 和 TIBAN？

How to join the tables KNBK and TIBAN?

abap

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opensql