ABAP Select data from SAP table J_2GMD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_2GMD 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_2GMD. 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_2GMD 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_2GMD TYPE STANDARD TABLE OF J_2GMD,
      WA_J_2GMD TYPE J_2GMD,
      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_2GMD> TYPE J_2GMD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_2GMD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_2GMD
  INTO TABLE IT_J_2GMD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_2GMD
*  INTO TABLE @DATA(IT_J_2GMD2).
*--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_2GMD INDEX 1 INTO DATA(WA_J_2GMD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_2GMD ASSIGNING <J_2GMD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_2GMD>-NAME1 = 1.
<J_2GMD>-NAME2 = 1.
<J_2GMD>-NAMETXT = 1.
<J_2GMD>-VNAM = 1.
<J_2GMD>-PROF = 1.

ENDLOOP.

LOOP AT IT_J_2GMD INTO WA_J_2GMD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_2GMD-TAXCODE, sy-vline,
  WA_J_2GMD-TAXAUTH, sy-vline,
  WA_J_2GMD-TAXFNUM, sy-vline,
  WA_J_2GMD-TAXRGNR, sy-vline,
  WA_J_2GMD-PRNUM, sy-vline,
  WA_J_2GMD-RCNUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_2GMD 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_2GMD 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_2GMD INTO WA_J_2GMD.


*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 SXIDN, internal->external for field EMAIL
CALL FUNCTION 'CONVERSION_EXIT_SXIDN_OUTPUT'
  EXPORTING
    input =                      WA_J_2GMD-EMAIL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_2GMD-EMAIL.
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_2GMD_STR, 
NAME1 TYPE STRING,
NAME2 TYPE STRING,
NAMETXT TYPE STRING,
VNAM TYPE STRING,
PROF TYPE STRING,
TAXCODE TYPE STRING,
TAXAUTH TYPE STRING,
TAXFNUM TYPE STRING,
TAXRGNR TYPE STRING,
PRNUM TYPE STRING,
RCNUM TYPE STRING,
CITY TYPE STRING,
STRAS TYPE STRING,
STRNA TYPE STRING,
STRNR TYPE STRING,
PSTLZ TYPE STRING,
TELF1 TYPE STRING,
TELFX TYPE STRING,
EMAIL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_2GMD_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_2GMD_STR-NAME1 sy-vline 
WA_J_2GMD_STR-NAME2 sy-vline 
WA_J_2GMD_STR-NAMETXT sy-vline 
WA_J_2GMD_STR-VNAM sy-vline 
WA_J_2GMD_STR-PROF sy-vline 
WA_J_2GMD_STR-TAXCODE sy-vline 
WA_J_2GMD_STR-TAXAUTH sy-vline 
WA_J_2GMD_STR-TAXFNUM sy-vline 
WA_J_2GMD_STR-TAXRGNR sy-vline 
WA_J_2GMD_STR-PRNUM sy-vline 
WA_J_2GMD_STR-RCNUM sy-vline 
WA_J_2GMD_STR-CITY sy-vline 
WA_J_2GMD_STR-STRAS sy-vline 
WA_J_2GMD_STR-STRNA sy-vline 
WA_J_2GMD_STR-STRNR sy-vline 
WA_J_2GMD_STR-PSTLZ sy-vline 
WA_J_2GMD_STR-TELF1 sy-vline 
WA_J_2GMD_STR-TELFX sy-vline 
WA_J_2GMD_STR-EMAIL sy-vline      INTO ld_text SEPARATED BY SPACE.

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