ABAP Select data from SAP table IDGT_GTDM into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IDGT_GTDM
*  INTO TABLE @DATA(IT_IDGT_GTDM2).
*--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_IDGT_GTDM INDEX 1 INTO DATA(WA_IDGT_GTDM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IDGT_GTDM>-MANDT = 1.
<IDGT_GTDM>-VBELN = 1.
<IDGT_GTDM>-POSNR = 1.
<IDGT_GTDM>-VBELN_GTD = 1.
<IDGT_GTDM>-POSNR_GTD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IDGT_GTDM-COMBINEID, sy-vline,
  WA_IDGT_GTDM-VBTYP, sy-vline,
  WA_IDGT_GTDM-VKORG, sy-vline,
  WA_IDGT_GTDM-VTWEG, sy-vline,
  WA_IDGT_GTDM-SPART, sy-vline,
  WA_IDGT_GTDM-BUKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IDGT_GTDM 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_IDGT_GTDM 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_IDGT_GTDM INTO WA_IDGT_GTDM.


*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 VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_IDGT_GTDM-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IDGT_GTDM-VBELN.
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_IDGT_GTDM_STR, 
MANDT TYPE STRING,
VBELN TYPE STRING,
POSNR TYPE STRING,
VBELN_GTD TYPE STRING,
POSNR_GTD TYPE STRING,
COMBINEID TYPE STRING,
VBTYP TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
BUKRS TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
GTKEY1 TYPE STRING,
GTKEY2 TYPE STRING,
GTKEY3 TYPE STRING,
GTOTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IDGT_GTDM_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_IDGT_GTDM_STR-MANDT sy-vline 
WA_IDGT_GTDM_STR-VBELN sy-vline 
WA_IDGT_GTDM_STR-POSNR sy-vline 
WA_IDGT_GTDM_STR-VBELN_GTD sy-vline 
WA_IDGT_GTDM_STR-POSNR_GTD sy-vline 
WA_IDGT_GTDM_STR-COMBINEID sy-vline 
WA_IDGT_GTDM_STR-VBTYP sy-vline 
WA_IDGT_GTDM_STR-VKORG sy-vline 
WA_IDGT_GTDM_STR-VTWEG sy-vline 
WA_IDGT_GTDM_STR-SPART sy-vline 
WA_IDGT_GTDM_STR-BUKRS sy-vline 
WA_IDGT_GTDM_STR-ERNAM sy-vline 
WA_IDGT_GTDM_STR-ERDAT sy-vline 
WA_IDGT_GTDM_STR-ERZET sy-vline 
WA_IDGT_GTDM_STR-GTKEY1 sy-vline 
WA_IDGT_GTDM_STR-GTKEY2 sy-vline 
WA_IDGT_GTDM_STR-GTKEY3 sy-vline 
WA_IDGT_GTDM_STR-GTOTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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