ABAP Select data from SAP table /MDGMM/_S_MM_FP_MLGNSTOR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /MDGMM/_S_MM_FP_MLGNSTOR 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 /MDGMM/_S_MM_FP_MLGNSTOR. 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 /MDGMM/_S_MM_FP_MLGNSTOR 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_/MDGMM/_S_MM_FP_MLGNSTOR TYPE STANDARD TABLE OF /MDGMM/_S_MM_FP_MLGNSTOR,
      WA_/MDGMM/_S_MM_FP_MLGNSTOR TYPE /MDGMM/_S_MM_FP_MLGNSTOR,
      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: </MDGMM/_S_MM_FP_MLGNSTOR> TYPE /MDGMM/_S_MM_FP_MLGNSTOR.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /MDGMM/_S_MM_FP_MLGNSTOR
  INTO TABLE IT_/MDGMM/_S_MM_FP_MLGNSTOR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MDGMM/_S_MM_FP_MLGNSTOR
*  INTO TABLE @DATA(IT_/MDGMM/_S_MM_FP_MLGNSTOR2).
*--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_/MDGMM/_S_MM_FP_MLGNSTOR INDEX 1 INTO DATA(WA_/MDGMM/_S_MM_FP_MLGNSTOR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/MDGMM/_S_MM_FP_MLGNSTOR ASSIGNING </MDGMM/_S_MM_FP_MLGNSTOR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MDGMM/_S_MM_FP_MLGNSTOR>-LGNUM = 1.
</MDGMM/_S_MM_FP_MLGNSTOR>-MATERIAL = 1.
</MDGMM/_S_MM_FP_MLGNSTOR>-BEZME = 1.
</MDGMM/_S_MM_FP_MLGNSTOR>-BLOMLGNST = 1.
</MDGMM/_S_MM_FP_MLGNSTOR>-BSSMLGNST = 1.

ENDLOOP.

LOOP AT IT_/MDGMM/_S_MM_FP_MLGNSTOR INTO WA_/MDGMM/_S_MM_FP_MLGNSTOR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MDGMM/_S_MM_FP_MLGNSTOR-KZMBF, sy-vline,
  WA_/MDGMM/_S_MM_FP_MLGNSTOR-KZZUL, sy-vline,
  WA_/MDGMM/_S_MM_FP_MLGNSTOR-L2SKR, sy-vline,
  WA_/MDGMM/_S_MM_FP_MLGNSTOR-LE1MLGNST, sy-vline,
  WA_/MDGMM/_S_MM_FP_MLGNSTOR-LE2MLGNST, sy-vline,
  WA_/MDGMM/_S_MM_FP_MLGNSTOR-LE3MLGNST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MDGMM/_S_MM_FP_MLGNSTOR 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_/MDGMM/_S_MM_FP_MLGNSTOR 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_/MDGMM/_S_MM_FP_MLGNSTOR INTO WA_/MDGMM/_S_MM_FP_MLGNSTOR.


*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_/MDGMM/_S_MM_FP_MLGNSTOR_STR, 
LGNUM TYPE STRING,
MATERIAL TYPE STRING,
BEZME TYPE STRING,
BLOMLGNST TYPE STRING,
BSSMLGNST TYPE STRING,
KZMBF TYPE STRING,
KZZUL TYPE STRING,
L2SKR TYPE STRING,
LE1MLGNST TYPE STRING,
LE2MLGNST TYPE STRING,
LE3MLGNST TYPE STRING,
LGBMLGNST TYPE STRING,
LHME1 TYPE STRING,
LHME2 TYPE STRING,
LHME3 TYPE STRING,
LHMG1 TYPE STRING,
LHMG2 TYPE STRING,
LHMG3 TYPE STRING,
LTAMLGNST TYPE STRING,
LTEMLGNST TYPE STRING,
LVORMMLGN TYPE STRING,
LVSME TYPE STRING,
MKAPV TYPE STRING,
PLKMLGNST TYPE STRING,
VOMEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MDGMM/_S_MM_FP_MLGNSTOR_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_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LGNUM sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-MATERIAL sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-BEZME sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-BLOMLGNST sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-BSSMLGNST sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-KZMBF sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-KZZUL sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-L2SKR sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LE1MLGNST sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LE2MLGNST sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LE3MLGNST sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LGBMLGNST sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LHME1 sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LHME2 sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LHME3 sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LHMG1 sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LHMG2 sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LHMG3 sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LTAMLGNST sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LTEMLGNST sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LVORMMLGN sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-LVSME sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-MKAPV sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-PLKMLGNST sy-vline 
WA_/MDGMM/_S_MM_FP_MLGNSTOR_STR-VOMEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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