ABAP Select data from SAP table RCGGENMRG into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RCGGENMRG 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 RCGGENMRG. 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 RCGGENMRG 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_RCGGENMRG TYPE STANDARD TABLE OF RCGGENMRG,
      WA_RCGGENMRG TYPE RCGGENMRG,
      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: <RCGGENMRG> TYPE RCGGENMRG.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCGGENMRG
*  INTO TABLE @DATA(IT_RCGGENMRG2).
*--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_RCGGENMRG INDEX 1 INTO DATA(WA_RCGGENMRG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCGGENMRG>-ACTNTVH = 1.
<RCGGENMRG>-ESNTFLG = 1.
<RCGGENMRG>-STFLG = 1.
<RCGGENMRG>-MARKFLG = 1.
<RCGGENMRG>-SELEFLG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCGGENMRG-LINENO, sy-vline,
  WA_RCGGENMRG-LINEMOD, sy-vline,
  WA_RCGGENMRG-CHCOFLG, sy-vline,
  WA_RCGGENMRG-LOCKMOD, sy-vline,
  WA_RCGGENMRG-INTRFLG, sy-vline,
  WA_RCGGENMRG-MANDT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCGGENMRG 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_RCGGENMRG 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_RCGGENMRG INTO WA_RCGGENMRG.


*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 ACTNTVH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGGENMRG-ACTNTVH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGGENMRG-ACTNTVH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGGENMRG-RECN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGGENMRG-RECN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ACTN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGGENMRG-ACTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGGENMRG-ACTN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGGENMRG-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGGENMRG-AENNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field OWNID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGGENMRG-OWNID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGGENMRG-OWNID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNROOT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGGENMRG-RECNROOT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGGENMRG-RECNROOT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNTVH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGGENMRG-RECNTVH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGGENMRG-RECNTVH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECN_TPLH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGGENMRG-RECN_TPLH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGGENMRG-RECN_TPLH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNTVA_SRC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGGENMRG-RECNTVA_SRC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGGENMRG-RECNTVA_SRC.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNTVA_ORIG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGGENMRG-RECNTVA_ORIG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGGENMRG-RECNTVA_ORIG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECNROOT_ORIG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGGENMRG-RECNROOT_ORIG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGGENMRG-RECNROOT_ORIG.
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_RCGGENMRG_STR, 
ACTNTVH TYPE STRING,
ESNTFLG TYPE STRING,
STFLG TYPE STRING,
MARKFLG TYPE STRING,
SELEFLG TYPE STRING,
LINENO TYPE STRING,
LINEMOD TYPE STRING,
CHCOFLG TYPE STRING,
LOCKMOD TYPE STRING,
INTRFLG TYPE STRING,
MANDT TYPE STRING,
RECN TYPE STRING,
ACTN TYPE STRING,
VALFR TYPE STRING,
VALTO TYPE STRING,
AENNR TYPE STRING,
DELFLG TYPE STRING,
PARKFLG TYPE STRING,
CRDAT TYPE STRING,
CRNAM TYPE STRING,
UPDDAT TYPE STRING,
UPDNAM TYPE STRING,
SRSID TYPE STRING,
OWNID TYPE STRING,
RECNROOT TYPE STRING,
RECNTVH TYPE STRING,
ORD TYPE STRING,
COMPREL TYPE STRING,
FLG_INHSRC TYPE STRING,
FLG_INHOVR TYPE STRING,
FLG_INHEXCL TYPE STRING,
RECN_TPLH TYPE STRING,
RECNTVA_SRC TYPE STRING,
RECNTVA_ORIG TYPE STRING,
RECNROOT_ORIG TYPE STRING,
TPL_ORD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCGGENMRG_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_RCGGENMRG_STR-ACTNTVH sy-vline 
WA_RCGGENMRG_STR-ESNTFLG sy-vline 
WA_RCGGENMRG_STR-STFLG sy-vline 
WA_RCGGENMRG_STR-MARKFLG sy-vline 
WA_RCGGENMRG_STR-SELEFLG sy-vline 
WA_RCGGENMRG_STR-LINENO sy-vline 
WA_RCGGENMRG_STR-LINEMOD sy-vline 
WA_RCGGENMRG_STR-CHCOFLG sy-vline 
WA_RCGGENMRG_STR-LOCKMOD sy-vline 
WA_RCGGENMRG_STR-INTRFLG sy-vline 
WA_RCGGENMRG_STR-MANDT sy-vline 
WA_RCGGENMRG_STR-RECN sy-vline 
WA_RCGGENMRG_STR-ACTN sy-vline 
WA_RCGGENMRG_STR-VALFR sy-vline 
WA_RCGGENMRG_STR-VALTO sy-vline 
WA_RCGGENMRG_STR-AENNR sy-vline 
WA_RCGGENMRG_STR-DELFLG sy-vline 
WA_RCGGENMRG_STR-PARKFLG sy-vline 
WA_RCGGENMRG_STR-CRDAT sy-vline 
WA_RCGGENMRG_STR-CRNAM sy-vline 
WA_RCGGENMRG_STR-UPDDAT sy-vline 
WA_RCGGENMRG_STR-UPDNAM sy-vline 
WA_RCGGENMRG_STR-SRSID sy-vline 
WA_RCGGENMRG_STR-OWNID sy-vline 
WA_RCGGENMRG_STR-RECNROOT sy-vline 
WA_RCGGENMRG_STR-RECNTVH sy-vline 
WA_RCGGENMRG_STR-ORD sy-vline 
WA_RCGGENMRG_STR-COMPREL sy-vline 
WA_RCGGENMRG_STR-FLG_INHSRC sy-vline 
WA_RCGGENMRG_STR-FLG_INHOVR sy-vline 
WA_RCGGENMRG_STR-FLG_INHEXCL sy-vline 
WA_RCGGENMRG_STR-RECN_TPLH sy-vline 
WA_RCGGENMRG_STR-RECNTVA_SRC sy-vline 
WA_RCGGENMRG_STR-RECNTVA_ORIG sy-vline 
WA_RCGGENMRG_STR-RECNROOT_ORIG sy-vline 
WA_RCGGENMRG_STR-TPL_ORD sy-vline      INTO ld_text SEPARATED BY SPACE.

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