ABAP Select data from SAP table J_3GBKNA1A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_3GBKNA1A 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 J_3GBKNA1A. 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 J_3GBKNA1A 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_J_3GBKNA1A TYPE STANDARD TABLE OF J_3GBKNA1A,
      WA_J_3GBKNA1A TYPE J_3GBKNA1A,
      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: <J_3GBKNA1A> TYPE J_3GBKNA1A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_3GBKNA1A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_3GBKNA1A
  INTO TABLE IT_J_3GBKNA1A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_3GBKNA1A
*  INTO TABLE @DATA(IT_J_3GBKNA1A2).
*--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_J_3GBKNA1A INDEX 1 INTO DATA(WA_J_3GBKNA1A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_3GBKNA1A ASSIGNING <J_3GBKNA1A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_3GBKNA1A>-J_3GETYP = 1.
<J_3GBKNA1A>-J_3GREFTYP = 1.
<J_3GBKNA1A>-PSPNR = 1.
<J_3GBKNA1A>-COAUFNR = 1.
<J_3GBKNA1A>-J_3GAGEXT = 1.

ENDLOOP.

LOOP AT IT_J_3GBKNA1A INTO WA_J_3GBKNA1A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_3GBKNA1A-J_3GAGINT, sy-vline,
  WA_J_3GBKNA1A-J_3GAGDUMI, sy-vline,
  WA_J_3GBKNA1A-J_3GAGSTDI, sy-vline,
  WA_J_3GBKNA1A-LGORT, sy-vline,
  WA_J_3GBKNA1A-KOKRS, sy-vline,
  WA_J_3GBKNA1A-KOSTL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_3GBKNA1A 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_J_3GBKNA1A 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_J_3GBKNA1A INTO WA_J_3GBKNA1A.


*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.

*Conversion exit ALPHA, internal->external for field COAUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3GBKNA1A-COAUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3GBKNA1A-COAUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field J_3GAGEXT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3GBKNA1A-J_3GAGEXT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3GBKNA1A-J_3GAGEXT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field J_3GAGINT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3GBKNA1A-J_3GAGINT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3GBKNA1A-J_3GAGINT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field J_3GAGDUMI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3GBKNA1A-J_3GAGDUMI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3GBKNA1A-J_3GAGDUMI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field J_3GAGSTDI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3GBKNA1A-J_3GAGSTDI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3GBKNA1A-J_3GAGSTDI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3GBKNA1A-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3GBKNA1A-KOSTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSN, internal->external for field PSPID
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_J_3GBKNA1A-PSPID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3GBKNA1A-PSPID.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_J_3GBKNA1A_STR, 
J_3GETYP TYPE STRING,
J_3GREFTYP TYPE STRING,
PSPNR TYPE STRING,
COAUFNR TYPE STRING,
J_3GAGEXT TYPE STRING,
J_3GAGINT TYPE STRING,
J_3GAGDUMI TYPE STRING,
J_3GAGSTDI TYPE STRING,
LGORT TYPE STRING,
KOKRS TYPE STRING,
KOSTL TYPE STRING,
J_3GABGLG TYPE STRING,
J_3GABGVG TYPE STRING,
J_3GABRART TYPE STRING,
J_3GSTDMON TYPE STRING,
J_3GSTDTAG TYPE STRING,
J_3GTAGMON TYPE STRING,
J_3GZUGTAG TYPE STRING,
J_3GMASCHB TYPE STRING,
J_3GMEINSA TYPE STRING,
J_3GKEINSA TYPE STRING,
J_3GBLSPER TYPE STRING,
J_3GKLEIVO TYPE STRING,
J_3GCALID TYPE STRING,
J_3GVMONAT TYPE STRING,
J_3GABRKEN TYPE STRING,
J_3GLABRECH TYPE STRING,
J_3GAABRECH TYPE STRING,
J_3GZUTVHLG TYPE STRING,
J_3GNEGMEN TYPE STRING,
J_3GFRISTLO TYPE STRING,
J_3GEMINBE TYPE STRING,
J_3GFMGUE TYPE STRING,
J_3GZUSCHUE TYPE STRING,
J_3GSCHPRS TYPE STRING,
J_3GINVSTA TYPE STRING,
/SAPCEM/DBER TYPE STRING,
/SAPCEM/KVMEQ TYPE STRING,
WERKS TYPE STRING,
PSPID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_3GBKNA1A_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_J_3GBKNA1A_STR-J_3GETYP sy-vline 
WA_J_3GBKNA1A_STR-J_3GREFTYP sy-vline 
WA_J_3GBKNA1A_STR-PSPNR sy-vline 
WA_J_3GBKNA1A_STR-COAUFNR sy-vline 
WA_J_3GBKNA1A_STR-J_3GAGEXT sy-vline 
WA_J_3GBKNA1A_STR-J_3GAGINT sy-vline 
WA_J_3GBKNA1A_STR-J_3GAGDUMI sy-vline 
WA_J_3GBKNA1A_STR-J_3GAGSTDI sy-vline 
WA_J_3GBKNA1A_STR-LGORT sy-vline 
WA_J_3GBKNA1A_STR-KOKRS sy-vline 
WA_J_3GBKNA1A_STR-KOSTL sy-vline 
WA_J_3GBKNA1A_STR-J_3GABGLG sy-vline 
WA_J_3GBKNA1A_STR-J_3GABGVG sy-vline 
WA_J_3GBKNA1A_STR-J_3GABRART sy-vline 
WA_J_3GBKNA1A_STR-J_3GSTDMON sy-vline 
WA_J_3GBKNA1A_STR-J_3GSTDTAG sy-vline 
WA_J_3GBKNA1A_STR-J_3GTAGMON sy-vline 
WA_J_3GBKNA1A_STR-J_3GZUGTAG sy-vline 
WA_J_3GBKNA1A_STR-J_3GMASCHB sy-vline 
WA_J_3GBKNA1A_STR-J_3GMEINSA sy-vline 
WA_J_3GBKNA1A_STR-J_3GKEINSA sy-vline 
WA_J_3GBKNA1A_STR-J_3GBLSPER sy-vline 
WA_J_3GBKNA1A_STR-J_3GKLEIVO sy-vline 
WA_J_3GBKNA1A_STR-J_3GCALID sy-vline 
WA_J_3GBKNA1A_STR-J_3GVMONAT sy-vline 
WA_J_3GBKNA1A_STR-J_3GABRKEN sy-vline 
WA_J_3GBKNA1A_STR-J_3GLABRECH sy-vline 
WA_J_3GBKNA1A_STR-J_3GAABRECH sy-vline 
WA_J_3GBKNA1A_STR-J_3GZUTVHLG sy-vline 
WA_J_3GBKNA1A_STR-J_3GNEGMEN sy-vline 
WA_J_3GBKNA1A_STR-J_3GFRISTLO sy-vline 
WA_J_3GBKNA1A_STR-J_3GEMINBE sy-vline 
WA_J_3GBKNA1A_STR-J_3GFMGUE sy-vline 
WA_J_3GBKNA1A_STR-J_3GZUSCHUE sy-vline 
WA_J_3GBKNA1A_STR-J_3GSCHPRS sy-vline 
WA_J_3GBKNA1A_STR-J_3GINVSTA sy-vline 
WA_J_3GBKNA1A_STR-/SAPCEM/DBER sy-vline 
WA_J_3GBKNA1A_STR-/SAPCEM/KVMEQ sy-vline 
WA_J_3GBKNA1A_STR-WERKS sy-vline 
WA_J_3GBKNA1A_STR-PSPID sy-vline      INTO ld_text SEPARATED BY SPACE.

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