ABAP Select data from SAP table GTABKEYEXC20 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP GTABKEYEXC20 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 GTABKEYEXC20. 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 GTABKEYEXC20 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_GTABKEYEXC20 TYPE STANDARD TABLE OF GTABKEYEXC20,
      WA_GTABKEYEXC20 TYPE GTABKEYEXC20,
      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: <GTABKEYEXC20> TYPE GTABKEYEXC20.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_GTABKEYEXC20.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM GTABKEYEXC20
  INTO TABLE IT_GTABKEYEXC20.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GTABKEYEXC20
*  INTO TABLE @DATA(IT_GTABKEYEXC202).
*--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_GTABKEYEXC20 INDEX 1 INTO DATA(WA_GTABKEYEXC202).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_GTABKEYEXC20 ASSIGNING <GTABKEYEXC20>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GTABKEYEXC20>-TABNAME = 1.
<GTABKEYEXC20>-CDLVUNIT = 1.
<GTABKEYEXC20>-CRELEASE = 1.
<GTABKEYEXC20>-EXCL_CDLVUNIT = 1.
<GTABKEYEXC20>-EXCL_CRELEASE = 1.

ENDLOOP.

LOOP AT IT_GTABKEYEXC20 INTO WA_GTABKEYEXC20.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GTABKEYEXC20-CGROUP, sy-vline,
  WA_GTABKEYEXC20-TABKEY, sy-vline,
  WA_GTABKEYEXC20-AS4POS, sy-vline,
  WA_GTABKEYEXC20-EXC_STATUS, sy-vline,
  WA_GTABKEYEXC20-ENDKEY, sy-vline,
  WA_GTABKEYEXC20-REQUESTER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GTABKEYEXC20 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_GTABKEYEXC20 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_GTABKEYEXC20 INTO WA_GTABKEYEXC20.


*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_GTABKEYEXC20_STR, 
TABNAME TYPE STRING,
CDLVUNIT TYPE STRING,
CRELEASE TYPE STRING,
EXCL_CDLVUNIT TYPE STRING,
EXCL_CRELEASE TYPE STRING,
CGROUP TYPE STRING,
TABKEY TYPE STRING,
AS4POS TYPE STRING,
EXC_STATUS TYPE STRING,
ENDKEY TYPE STRING,
REQUESTER TYPE STRING,
APPROVER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,
REASON TYPE STRING,
CONF_LEVEL TYPE STRING,
LAYOUTID TYPE STRING,
STAR TYPE STRING,
STAR_POS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GTABKEYEXC20_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_GTABKEYEXC20_STR-TABNAME sy-vline 
WA_GTABKEYEXC20_STR-CDLVUNIT sy-vline 
WA_GTABKEYEXC20_STR-CRELEASE sy-vline 
WA_GTABKEYEXC20_STR-EXCL_CDLVUNIT sy-vline 
WA_GTABKEYEXC20_STR-EXCL_CRELEASE sy-vline 
WA_GTABKEYEXC20_STR-CGROUP sy-vline 
WA_GTABKEYEXC20_STR-TABKEY sy-vline 
WA_GTABKEYEXC20_STR-AS4POS sy-vline 
WA_GTABKEYEXC20_STR-EXC_STATUS sy-vline 
WA_GTABKEYEXC20_STR-ENDKEY sy-vline 
WA_GTABKEYEXC20_STR-REQUESTER sy-vline 
WA_GTABKEYEXC20_STR-APPROVER sy-vline 
WA_GTABKEYEXC20_STR-AS4DATE sy-vline 
WA_GTABKEYEXC20_STR-AS4TIME sy-vline 
WA_GTABKEYEXC20_STR-REASON sy-vline 
WA_GTABKEYEXC20_STR-CONF_LEVEL sy-vline 
WA_GTABKEYEXC20_STR-LAYOUTID sy-vline 
WA_GTABKEYEXC20_STR-STAR sy-vline 
WA_GTABKEYEXC20_STR-STAR_POS sy-vline      INTO ld_text SEPARATED BY SPACE.

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