ABAP Select data from SAP table BANKCHAIN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BANKCHAIN table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to BANKCHAIN. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the BANKCHAIN table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_BANKCHAIN TYPE STANDARD TABLE OF BANKCHAIN,
      WA_BANKCHAIN TYPE BANKCHAIN,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <BANKCHAIN> TYPE BANKCHAIN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_BANKCHAIN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM BANKCHAIN
  INTO TABLE IT_BANKCHAIN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BANKCHAIN
*  INTO TABLE @DATA(IT_BANKCHAIN2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_BANKCHAIN INDEX 1 INTO DATA(WA_BANKCHAIN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_BANKCHAIN ASSIGNING <BANKCHAIN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BANKCHAIN>-BTYP1 = 1.
<BANKCHAIN>-BNKS1 = 1.
<BANKCHAIN>-BNKL1 = 1.
<BANKCHAIN>-BNKN1 = 1.
<BANKCHAIN>-BKON1 = 1.

ENDLOOP.

LOOP AT IT_BANKCHAIN INTO WA_BANKCHAIN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BANKCHAIN-BKRF1, sy-vline,
  WA_BANKCHAIN-IBAN1, sy-vline,
  WA_BANKCHAIN-BTYP2, sy-vline,
  WA_BANKCHAIN-BNKS2, sy-vline,
  WA_BANKCHAIN-BNKL2, sy-vline,
  WA_BANKCHAIN-BNKN2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BANKCHAIN you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_BANKCHAIN TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_BANKCHAIN INTO WA_BANKCHAIN.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_BANKCHAIN_STR, 
BTYP1 TYPE STRING,
BNKS1 TYPE STRING,
BNKL1 TYPE STRING,
BNKN1 TYPE STRING,
BKON1 TYPE STRING,
BKRF1 TYPE STRING,
IBAN1 TYPE STRING,
BTYP2 TYPE STRING,
BNKS2 TYPE STRING,
BNKL2 TYPE STRING,
BNKN2 TYPE STRING,
BKON2 TYPE STRING,
BKRF2 TYPE STRING,
IBAN2 TYPE STRING,
BTYP3 TYPE STRING,
BNKS3 TYPE STRING,
BNKL3 TYPE STRING,
BNKN3 TYPE STRING,
BKON3 TYPE STRING,
BKRF3 TYPE STRING,
IBAN3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BANKCHAIN_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_BANKCHAIN_STR-BTYP1 sy-vline 
WA_BANKCHAIN_STR-BNKS1 sy-vline 
WA_BANKCHAIN_STR-BNKL1 sy-vline 
WA_BANKCHAIN_STR-BNKN1 sy-vline 
WA_BANKCHAIN_STR-BKON1 sy-vline 
WA_BANKCHAIN_STR-BKRF1 sy-vline 
WA_BANKCHAIN_STR-IBAN1 sy-vline 
WA_BANKCHAIN_STR-BTYP2 sy-vline 
WA_BANKCHAIN_STR-BNKS2 sy-vline 
WA_BANKCHAIN_STR-BNKL2 sy-vline 
WA_BANKCHAIN_STR-BNKN2 sy-vline 
WA_BANKCHAIN_STR-BKON2 sy-vline 
WA_BANKCHAIN_STR-BKRF2 sy-vline 
WA_BANKCHAIN_STR-IBAN2 sy-vline 
WA_BANKCHAIN_STR-BTYP3 sy-vline 
WA_BANKCHAIN_STR-BNKS3 sy-vline 
WA_BANKCHAIN_STR-BNKL3 sy-vline 
WA_BANKCHAIN_STR-BNKN3 sy-vline 
WA_BANKCHAIN_STR-BKON3 sy-vline 
WA_BANKCHAIN_STR-BKRF3 sy-vline 
WA_BANKCHAIN_STR-IBAN3 sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.