ABAP Select data from SAP table VSGT_MLGT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VSGT_MLGT
*  INTO TABLE @DATA(IT_VSGT_MLGT2).
*--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_VSGT_MLGT INDEX 1 INTO DATA(WA_VSGT_MLGT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VSGT_MLGT>-MANDT = 1.
<VSGT_MLGT>-MATNR = 1.
<VSGT_MLGT>-LGNUM = 1.
<VSGT_MLGT>-LGTYP = 1.
<VSGT_MLGT>-SGT_SCAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VSGT_MLGT-LVORM, sy-vline,
  WA_VSGT_MLGT-LGPLA, sy-vline,
  WA_VSGT_MLGT-LPMAX, sy-vline,
  WA_VSGT_MLGT-LPMIN, sy-vline,
  WA_VSGT_MLGT-MAMNG, sy-vline,
  WA_VSGT_MLGT-NSMNG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VSGT_MLGT 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_VSGT_MLGT 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_VSGT_MLGT INTO WA_VSGT_MLGT.


*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_VSGT_MLGT-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VSGT_MLGT-MATNR.
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_VSGT_MLGT_STR, 
MANDT TYPE STRING,
MATNR TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
SGT_SCAT TYPE STRING,
LVORM TYPE STRING,
LGPLA TYPE STRING,
LPMAX TYPE STRING,
LPMIN TYPE STRING,
MAMNG TYPE STRING,
NSMNG TYPE STRING,
KOBER TYPE STRING,
RDMNG TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VSGT_MLGT_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_VSGT_MLGT_STR-MANDT sy-vline 
WA_VSGT_MLGT_STR-MATNR sy-vline 
WA_VSGT_MLGT_STR-LGNUM sy-vline 
WA_VSGT_MLGT_STR-LGTYP sy-vline 
WA_VSGT_MLGT_STR-SGT_SCAT sy-vline 
WA_VSGT_MLGT_STR-LVORM sy-vline 
WA_VSGT_MLGT_STR-LGPLA sy-vline 
WA_VSGT_MLGT_STR-LPMAX sy-vline 
WA_VSGT_MLGT_STR-LPMIN sy-vline 
WA_VSGT_MLGT_STR-MAMNG sy-vline 
WA_VSGT_MLGT_STR-NSMNG sy-vline 
WA_VSGT_MLGT_STR-KOBER sy-vline 
WA_VSGT_MLGT_STR-RDMNG sy-vline 
WA_VSGT_MLGT_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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