ABAP Select data from SAP table MARDO1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MARDO1 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 MARDO1. 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 MARDO1 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_MARDO1 TYPE STANDARD TABLE OF MARDO1,
      WA_MARDO1 TYPE MARDO1,
      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: <MARDO1> TYPE MARDO1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MARDO1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MARDO1
  INTO TABLE IT_MARDO1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MARDO1
*  INTO TABLE @DATA(IT_MARDO12).
*--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_MARDO1 INDEX 1 INTO DATA(WA_MARDO12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MARDO1 ASSIGNING <MARDO1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MARDO1>-MANDT = 1.
<MARDO1>-MATNR = 1.
<MARDO1>-WERKS = 1.
<MARDO1>-LGORT = 1.
<MARDO1>-MSEHI = 1.

ENDLOOP.

LOOP AT IT_MARDO1 INTO WA_MARDO1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MARDO1-LABST, sy-vline,
  WA_MARDO1-UMLME, sy-vline,
  WA_MARDO1-INSME, sy-vline,
  WA_MARDO1-EINME, sy-vline,
  WA_MARDO1-SPEME, sy-vline,
  WA_MARDO1-RETME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MARDO1 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_MARDO1 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_MARDO1 INTO WA_MARDO1.


*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_MARDO1-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MARDO1-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MSEHI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MARDO1-MSEHI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MARDO1-MSEHI.
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_MARDO1_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
MSEHI 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,
KLABS TYPE STRING,
KINSM TYPE STRING,
KEINM TYPE STRING,
KSPEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MARDO1_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_MARDO1_STR-MANDT sy-vline 
WA_MARDO1_STR-MATNR sy-vline 
WA_MARDO1_STR-WERKS sy-vline 
WA_MARDO1_STR-LGORT sy-vline 
WA_MARDO1_STR-MSEHI sy-vline 
WA_MARDO1_STR-LABST sy-vline 
WA_MARDO1_STR-UMLME sy-vline 
WA_MARDO1_STR-INSME sy-vline 
WA_MARDO1_STR-EINME sy-vline 
WA_MARDO1_STR-SPEME sy-vline 
WA_MARDO1_STR-RETME sy-vline 
WA_MARDO1_STR-VMLAB sy-vline 
WA_MARDO1_STR-VMUML sy-vline 
WA_MARDO1_STR-VMINS sy-vline 
WA_MARDO1_STR-VMEIN sy-vline 
WA_MARDO1_STR-VMSPE sy-vline 
WA_MARDO1_STR-VMRET sy-vline 
WA_MARDO1_STR-KLABS sy-vline 
WA_MARDO1_STR-KINSM sy-vline 
WA_MARDO1_STR-KEINM sy-vline 
WA_MARDO1_STR-KSPEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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