ABAP Select data from SAP table MARD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MARD
*  INTO TABLE @DATA(IT_MARD2).
*--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_MARD INDEX 1 INTO DATA(WA_MARD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MARD>-MANDT = 1.
<MARD>-MATNR = 1.
<MARD>-WERKS = 1.
<MARD>-LGORT = 1.
<MARD>-PSTAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MARD-LVORM, sy-vline,
  WA_MARD-LFGJA, sy-vline,
  WA_MARD-LFMON, sy-vline,
  WA_MARD-SPERR, sy-vline,
  WA_MARD-LABST, sy-vline,
  WA_MARD-UMLME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MARD 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_MARD 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_MARD INTO WA_MARD.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_MARD-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MARD-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field LFGJA
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MARD-LFGJA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MARD-LFGJA.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit GJAHR, internal->external for field MDJIN
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_MARD-MDJIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MARD-MDJIN.
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_MARD_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
PSTAT TYPE STRING,
LVORM TYPE STRING,
LFGJA TYPE STRING,
LFMON TYPE STRING,
SPERR TYPE STRING,
LABST TYPE STRING,
UMLME TYPE STRING,
INSME TYPE STRING,
EINME TYPE STRING,
SPEME TYPE STRING,
RETME TYPE STRING,
VMLAB TYPE STRING,
VMUML TYPE STRING,
VMINS TYPE STRING,
VMEIN TYPE STRING,
VMSPE TYPE STRING,
VMRET TYPE STRING,
KZILL TYPE STRING,
KZILQ TYPE STRING,
KZILE TYPE STRING,
KZILS TYPE STRING,
KZVLL TYPE STRING,
KZVLQ TYPE STRING,
KZVLE TYPE STRING,
KZVLS TYPE STRING,
DISKZ TYPE STRING,
LSOBS TYPE STRING,
LMINB TYPE STRING,
LBSTF TYPE STRING,
HERKL TYPE STRING,
EXPPG TYPE STRING,
EXVER TYPE STRING,
LGPBE TYPE STRING,
KLABS TYPE STRING,
KINSM TYPE STRING,
KEINM TYPE STRING,
KSPEM TYPE STRING,
DLINL TYPE STRING,
PRCTL TYPE STRING,
ERSDA TYPE STRING,
VKLAB TYPE STRING,
VKUML TYPE STRING,
LWMKB TYPE STRING,
BSKRF TYPE STRING,
MDRUE TYPE STRING,
MDJIN TYPE STRING,
DUMMY_STL_INCL_EEW_PS TYPE STRING,
FSH_SALLOC_QTY_S TYPE STRING,
/CWM/LABST TYPE STRING,
/CWM/INSME TYPE STRING,
/CWM/EINME TYPE STRING,
/CWM/SPEME TYPE STRING,
/CWM/RETME TYPE STRING,
/CWM/UMLME TYPE STRING,
/CWM/KLABS TYPE STRING,
/CWM/KINSM TYPE STRING,
/CWM/KEINM TYPE STRING,
/CWM/KSPEM TYPE STRING,
/CWM/VMLAB TYPE STRING,
/CWM/VMINS TYPE STRING,
/CWM/VMEIN TYPE STRING,
/CWM/VMSPE TYPE STRING,
/CWM/VMRET TYPE STRING,
/CWM/VMUML TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MARD_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_MARD_STR-MANDT sy-vline 
WA_MARD_STR-MATNR sy-vline 
WA_MARD_STR-WERKS sy-vline 
WA_MARD_STR-LGORT sy-vline 
WA_MARD_STR-PSTAT sy-vline 
WA_MARD_STR-LVORM sy-vline 
WA_MARD_STR-LFGJA sy-vline 
WA_MARD_STR-LFMON sy-vline 
WA_MARD_STR-SPERR sy-vline 
WA_MARD_STR-LABST sy-vline 
WA_MARD_STR-UMLME sy-vline 
WA_MARD_STR-INSME sy-vline 
WA_MARD_STR-EINME sy-vline 
WA_MARD_STR-SPEME sy-vline 
WA_MARD_STR-RETME sy-vline 
WA_MARD_STR-VMLAB sy-vline 
WA_MARD_STR-VMUML sy-vline 
WA_MARD_STR-VMINS sy-vline 
WA_MARD_STR-VMEIN sy-vline 
WA_MARD_STR-VMSPE sy-vline 
WA_MARD_STR-VMRET sy-vline 
WA_MARD_STR-KZILL sy-vline 
WA_MARD_STR-KZILQ sy-vline 
WA_MARD_STR-KZILE sy-vline 
WA_MARD_STR-KZILS sy-vline 
WA_MARD_STR-KZVLL sy-vline 
WA_MARD_STR-KZVLQ sy-vline 
WA_MARD_STR-KZVLE sy-vline 
WA_MARD_STR-KZVLS sy-vline 
WA_MARD_STR-DISKZ sy-vline 
WA_MARD_STR-LSOBS sy-vline 
WA_MARD_STR-LMINB sy-vline 
WA_MARD_STR-LBSTF sy-vline 
WA_MARD_STR-HERKL sy-vline 
WA_MARD_STR-EXPPG sy-vline 
WA_MARD_STR-EXVER sy-vline 
WA_MARD_STR-LGPBE sy-vline 
WA_MARD_STR-KLABS sy-vline 
WA_MARD_STR-KINSM sy-vline 
WA_MARD_STR-KEINM sy-vline 
WA_MARD_STR-KSPEM sy-vline 
WA_MARD_STR-DLINL sy-vline 
WA_MARD_STR-PRCTL sy-vline 
WA_MARD_STR-ERSDA sy-vline 
WA_MARD_STR-VKLAB sy-vline 
WA_MARD_STR-VKUML sy-vline 
WA_MARD_STR-LWMKB sy-vline 
WA_MARD_STR-BSKRF sy-vline 
WA_MARD_STR-MDRUE sy-vline 
WA_MARD_STR-MDJIN sy-vline 
WA_MARD_STR-DUMMY_STL_INCL_EEW_PS sy-vline 
WA_MARD_STR-FSH_SALLOC_QTY_S sy-vline 
WA_MARD_STR-/CWM/LABST sy-vline 
WA_MARD_STR-/CWM/INSME sy-vline 
WA_MARD_STR-/CWM/EINME sy-vline 
WA_MARD_STR-/CWM/SPEME sy-vline 
WA_MARD_STR-/CWM/RETME sy-vline 
WA_MARD_STR-/CWM/UMLME sy-vline 
WA_MARD_STR-/CWM/KLABS sy-vline 
WA_MARD_STR-/CWM/KINSM sy-vline 
WA_MARD_STR-/CWM/KEINM sy-vline 
WA_MARD_STR-/CWM/KSPEM sy-vline 
WA_MARD_STR-/CWM/VMLAB sy-vline 
WA_MARD_STR-/CWM/VMINS sy-vline 
WA_MARD_STR-/CWM/VMEIN sy-vline 
WA_MARD_STR-/CWM/VMSPE sy-vline 
WA_MARD_STR-/CWM/VMRET sy-vline 
WA_MARD_STR-/CWM/VMUML sy-vline      INTO ld_text SEPARATED BY SPACE.

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