ABAP Select data from SAP table GTABKEY_C_SYS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GTABKEY_C_SYS
*  INTO TABLE @DATA(IT_GTABKEY_C_SYS2).
*--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_GTABKEY_C_SYS INDEX 1 INTO DATA(WA_GTABKEY_C_SYS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GTABKEY_C_SYS>-SID = 1.
<GTABKEY_C_SYS>-CDLVUNIT = 1.
<GTABKEY_C_SYS>-CRELEASE = 1.
<GTABKEY_C_SYS>-TRKORR = 1.
<GTABKEY_C_SYS>-AS4USER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GTABKEY_C_SYS-REGISTRATION, sy-vline,
  WA_GTABKEY_C_SYS-ACTDATE, sy-vline,
  WA_GTABKEY_C_SYS-ACTTIME, sy-vline,
  WA_GTABKEY_C_SYS-WITH_TADIR, sy-vline,
  WA_GTABKEY_C_SYS-CLIENT_VERSION, sy-vline,
  WA_GTABKEY_C_SYS-BASIS_VERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GTABKEY_C_SYS 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_GTABKEY_C_SYS 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_GTABKEY_C_SYS INTO WA_GTABKEY_C_SYS.


*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_GTABKEY_C_SYS_STR, 
SID TYPE STRING,
CDLVUNIT TYPE STRING,
CRELEASE TYPE STRING,
TRKORR TYPE STRING,
AS4USER TYPE STRING,
REGISTRATION TYPE STRING,
ACTDATE TYPE STRING,
ACTTIME TYPE STRING,
WITH_TADIR TYPE STRING,
CLIENT_VERSION TYPE STRING,
BASIS_VERS TYPE STRING,
BASIS_SPLVL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GTABKEY_C_SYS_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_GTABKEY_C_SYS_STR-SID sy-vline 
WA_GTABKEY_C_SYS_STR-CDLVUNIT sy-vline 
WA_GTABKEY_C_SYS_STR-CRELEASE sy-vline 
WA_GTABKEY_C_SYS_STR-TRKORR sy-vline 
WA_GTABKEY_C_SYS_STR-AS4USER sy-vline 
WA_GTABKEY_C_SYS_STR-REGISTRATION sy-vline 
WA_GTABKEY_C_SYS_STR-ACTDATE sy-vline 
WA_GTABKEY_C_SYS_STR-ACTTIME sy-vline 
WA_GTABKEY_C_SYS_STR-WITH_TADIR sy-vline 
WA_GTABKEY_C_SYS_STR-CLIENT_VERSION sy-vline 
WA_GTABKEY_C_SYS_STR-BASIS_VERS sy-vline 
WA_GTABKEY_C_SYS_STR-BASIS_SPLVL sy-vline      INTO ld_text SEPARATED BY SPACE.

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