ABAP Select data from SAP table MGEF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MGEF
*  INTO TABLE @DATA(IT_MGEF2).
*--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_MGEF INDEX 1 INTO DATA(WA_MGEF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MGEF>-MANDT = 1.
<MGEF>-STOFF = 1.
<MGEF>-REGKZ = 1.
<MGEF>-LAGKL = 1.
<MGEF>-WGFKL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MGEF-WGKKZ, sy-vline,
  WA_MGEF-GFVM1, sy-vline,
  WA_MGEF-GFVM2, sy-vline,
  WA_MGEF-GFVM3, sy-vline,
  WA_MGEF-GFVM4, sy-vline,
  WA_MGEF-GFVM5, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MGEF 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_MGEF 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_MGEF INTO WA_MGEF.


*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 MATN3, internal->external for field STOFF
CALL FUNCTION 'CONVERSION_EXIT_MATN3_OUTPUT'
  EXPORTING
    input =                      WA_MGEF-STOFF
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MGEF-STOFF.
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_MGEF_STR, 
MANDT TYPE STRING,
STOFF TYPE STRING,
REGKZ TYPE STRING,
LAGKL TYPE STRING,
WGFKL TYPE STRING,
WGKKZ TYPE STRING,
GFVM1 TYPE STRING,
GFVM2 TYPE STRING,
GFVM3 TYPE STRING,
GFVM4 TYPE STRING,
GFVM5 TYPE STRING,
GFVM6 TYPE STRING,
GFVM7 TYPE STRING,
GFVM8 TYPE STRING,
SFNR1 TYPE STRING,
SFNR2 TYPE STRING,
SFNR3 TYPE STRING,
SFNR4 TYPE STRING,
SFKO1 TYPE STRING,
SFKO2 TYPE STRING,
SFKO3 TYPE STRING,
SFKO4 TYPE STRING,
FLAPU TYPE STRING,
SIDNR TYPE STRING,
SIVAR TYPE STRING,
SIVER TYPE STRING,
LGFVM TYPE STRING,
AGGRE TYPE STRING,
VBFKL TYPE STRING,
STOFT TYPE STRING,
STOKL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MGEF_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_MGEF_STR-MANDT sy-vline 
WA_MGEF_STR-STOFF sy-vline 
WA_MGEF_STR-REGKZ sy-vline 
WA_MGEF_STR-LAGKL sy-vline 
WA_MGEF_STR-WGFKL sy-vline 
WA_MGEF_STR-WGKKZ sy-vline 
WA_MGEF_STR-GFVM1 sy-vline 
WA_MGEF_STR-GFVM2 sy-vline 
WA_MGEF_STR-GFVM3 sy-vline 
WA_MGEF_STR-GFVM4 sy-vline 
WA_MGEF_STR-GFVM5 sy-vline 
WA_MGEF_STR-GFVM6 sy-vline 
WA_MGEF_STR-GFVM7 sy-vline 
WA_MGEF_STR-GFVM8 sy-vline 
WA_MGEF_STR-SFNR1 sy-vline 
WA_MGEF_STR-SFNR2 sy-vline 
WA_MGEF_STR-SFNR3 sy-vline 
WA_MGEF_STR-SFNR4 sy-vline 
WA_MGEF_STR-SFKO1 sy-vline 
WA_MGEF_STR-SFKO2 sy-vline 
WA_MGEF_STR-SFKO3 sy-vline 
WA_MGEF_STR-SFKO4 sy-vline 
WA_MGEF_STR-FLAPU sy-vline 
WA_MGEF_STR-SIDNR sy-vline 
WA_MGEF_STR-SIVAR sy-vline 
WA_MGEF_STR-SIVER sy-vline 
WA_MGEF_STR-LGFVM sy-vline 
WA_MGEF_STR-AGGRE sy-vline 
WA_MGEF_STR-VBFKL sy-vline 
WA_MGEF_STR-STOFT sy-vline 
WA_MGEF_STR-STOKL sy-vline      INTO ld_text SEPARATED BY SPACE.

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