ABAP Select data from SAP table DCGENTB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DCGENTB
*  INTO TABLE @DATA(IT_DCGENTB2).
*--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_DCGENTB INDEX 1 INTO DATA(WA_DCGENTB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DCGENTB>-TYPE = 1.
<DCGENTB>-NAME = 1.
<DCGENTB>-INDX = 1.
<DCGENTB>-LOCAL = 1.
<DCGENTB>-ACTKIND = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DCGENTB-PART, sy-vline,
  WA_DCGENTB-LEVEL, sy-vline,
  WA_DCGENTB-RC, sy-vline,
  WA_DCGENTB-ACTFLAG, sy-vline,
  WA_DCGENTB-PGMID, sy-vline,
  WA_DCGENTB-NODOKU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DCGENTB 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_DCGENTB 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_DCGENTB INTO WA_DCGENTB.


*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 ISOLA, internal->external for field LANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_DCGENTB-LANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DCGENTB-LANG.
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_DCGENTB_STR, 
TYPE TYPE STRING,
NAME TYPE STRING,
INDX TYPE STRING,
LOCAL TYPE STRING,
ACTKIND TYPE STRING,
PART TYPE STRING,
LEVEL TYPE STRING,
RC TYPE STRING,
ACTFLAG TYPE STRING,
PGMID TYPE STRING,
NODOKU TYPE STRING,
TABIX TYPE STRING,
PRELEVEL TYPE STRING,
ARBGB TYPE STRING,
MSGNR TYPE STRING,
SEVERITY TYPE STRING,
PAR1 TYPE STRING,
PAR2 TYPE STRING,
PAR3 TYPE STRING,
PAR4 TYPE STRING,
OBJFUNC TYPE STRING,
ACTION TYPE STRING,
DDCALL TYPE STRING,
LANG TYPE STRING,
CYCLEOBJ TYPE STRING,
IS_USED TYPE STRING,
DELFLAG TYPE STRING,
SWITCHEDOF TYPE STRING,
SWITCHDEP TYPE STRING,
SETTMSTDEP TYPE STRING,
DISTACTION TYPE STRING,
DISTMODEFLAG TYPE STRING,
FIELDDEL TYPE STRING,
FIELDMOD TYPE STRING,
DEFAULTMOD TYPE STRING,
ENFORCE_ACT TYPE STRING,
ACTEXECUTED TYPE STRING,
GOT_STATE TYPE STRING,
CHGFLAG TYPE STRING,
NODBCHANGE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DCGENTB_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_DCGENTB_STR-TYPE sy-vline 
WA_DCGENTB_STR-NAME sy-vline 
WA_DCGENTB_STR-INDX sy-vline 
WA_DCGENTB_STR-LOCAL sy-vline 
WA_DCGENTB_STR-ACTKIND sy-vline 
WA_DCGENTB_STR-PART sy-vline 
WA_DCGENTB_STR-LEVEL sy-vline 
WA_DCGENTB_STR-RC sy-vline 
WA_DCGENTB_STR-ACTFLAG sy-vline 
WA_DCGENTB_STR-PGMID sy-vline 
WA_DCGENTB_STR-NODOKU sy-vline 
WA_DCGENTB_STR-TABIX sy-vline 
WA_DCGENTB_STR-PRELEVEL sy-vline 
WA_DCGENTB_STR-ARBGB sy-vline 
WA_DCGENTB_STR-MSGNR sy-vline 
WA_DCGENTB_STR-SEVERITY sy-vline 
WA_DCGENTB_STR-PAR1 sy-vline 
WA_DCGENTB_STR-PAR2 sy-vline 
WA_DCGENTB_STR-PAR3 sy-vline 
WA_DCGENTB_STR-PAR4 sy-vline 
WA_DCGENTB_STR-OBJFUNC sy-vline 
WA_DCGENTB_STR-ACTION sy-vline 
WA_DCGENTB_STR-DDCALL sy-vline 
WA_DCGENTB_STR-LANG sy-vline 
WA_DCGENTB_STR-CYCLEOBJ sy-vline 
WA_DCGENTB_STR-IS_USED sy-vline 
WA_DCGENTB_STR-DELFLAG sy-vline 
WA_DCGENTB_STR-SWITCHEDOF sy-vline 
WA_DCGENTB_STR-SWITCHDEP sy-vline 
WA_DCGENTB_STR-SETTMSTDEP sy-vline 
WA_DCGENTB_STR-DISTACTION sy-vline 
WA_DCGENTB_STR-DISTMODEFLAG sy-vline 
WA_DCGENTB_STR-FIELDDEL sy-vline 
WA_DCGENTB_STR-FIELDMOD sy-vline 
WA_DCGENTB_STR-DEFAULTMOD sy-vline 
WA_DCGENTB_STR-ENFORCE_ACT sy-vline 
WA_DCGENTB_STR-ACTEXECUTED sy-vline 
WA_DCGENTB_STR-GOT_STATE sy-vline 
WA_DCGENTB_STR-CHGFLAG sy-vline 
WA_DCGENTB_STR-NODBCHANGE sy-vline      INTO ld_text SEPARATED BY SPACE.

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