ABAP Select data from SAP table MDAG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDAG
*  INTO TABLE @DATA(IT_MDAG2).
*--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_MDAG INDEX 1 INTO DATA(WA_MDAG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDAG>-PLAKZ = 1.
<MDAG>-PLANR = 1.
<MDAG>-SORT0 = 1.
<MDAG>-DAT00 = 1.
<MDAG>-PERKZ = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDAG-PRPER, sy-vline,
  WA_MDAG-EXTSU, sy-vline,
  WA_MDAG-MNGD1, sy-vline,
  WA_MDAG-MNGD2, sy-vline,
  WA_MDAG-MNGD3, sy-vline,
  WA_MDAG-MNGD4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDAG 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_MDAG 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_MDAG INTO WA_MDAG.


*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_MDAG_STR, 
PLAKZ TYPE STRING,
PLANR TYPE STRING,
SORT0 TYPE STRING,
DAT00 TYPE STRING,
PERKZ TYPE STRING,
PRPER TYPE STRING,
EXTSU TYPE STRING,
MNGD1 TYPE STRING,
MNGD2 TYPE STRING,
MNGD3 TYPE STRING,
MNGD4 TYPE STRING,
MNGD5 TYPE STRING,
ISTRD TYPE STRING,
SLRWD TYPE STRING,
MIRWD TYPE STRING,
MARWD TYPE STRING,
TGBED TYPE STRING,
TGPRD TYPE STRING,
MNGA1 TYPE STRING,
MNGA2 TYPE STRING,
MNGA3 TYPE STRING,
MNGA4 TYPE STRING,
MNGA5 TYPE STRING,
ISTRA TYPE STRING,
SLRWA TYPE STRING,
MIRWA TYPE STRING,
MARWA TYPE STRING,
TGBEA TYPE STRING,
TGPRA TYPE STRING,
VLIND TYPE STRING,
BLIND TYPE STRING,
VLINA TYPE STRING,
BLINA TYPE STRING,
AEN01 TYPE STRING,
AEN02 TYPE STRING,
AEN03 TYPE STRING,
AEN04 TYPE STRING,
AEN05 TYPE STRING,
FBYTE TYPE STRING,
LIST1 TYPE STRING,
LIST2 TYPE STRING,
DETAIL_ICON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDAG_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_MDAG_STR-PLAKZ sy-vline 
WA_MDAG_STR-PLANR sy-vline 
WA_MDAG_STR-SORT0 sy-vline 
WA_MDAG_STR-DAT00 sy-vline 
WA_MDAG_STR-PERKZ sy-vline 
WA_MDAG_STR-PRPER sy-vline 
WA_MDAG_STR-EXTSU sy-vline 
WA_MDAG_STR-MNGD1 sy-vline 
WA_MDAG_STR-MNGD2 sy-vline 
WA_MDAG_STR-MNGD3 sy-vline 
WA_MDAG_STR-MNGD4 sy-vline 
WA_MDAG_STR-MNGD5 sy-vline 
WA_MDAG_STR-ISTRD sy-vline 
WA_MDAG_STR-SLRWD sy-vline 
WA_MDAG_STR-MIRWD sy-vline 
WA_MDAG_STR-MARWD sy-vline 
WA_MDAG_STR-TGBED sy-vline 
WA_MDAG_STR-TGPRD sy-vline 
WA_MDAG_STR-MNGA1 sy-vline 
WA_MDAG_STR-MNGA2 sy-vline 
WA_MDAG_STR-MNGA3 sy-vline 
WA_MDAG_STR-MNGA4 sy-vline 
WA_MDAG_STR-MNGA5 sy-vline 
WA_MDAG_STR-ISTRA sy-vline 
WA_MDAG_STR-SLRWA sy-vline 
WA_MDAG_STR-MIRWA sy-vline 
WA_MDAG_STR-MARWA sy-vline 
WA_MDAG_STR-TGBEA sy-vline 
WA_MDAG_STR-TGPRA sy-vline 
WA_MDAG_STR-VLIND sy-vline 
WA_MDAG_STR-BLIND sy-vline 
WA_MDAG_STR-VLINA sy-vline 
WA_MDAG_STR-BLINA sy-vline 
WA_MDAG_STR-AEN01 sy-vline 
WA_MDAG_STR-AEN02 sy-vline 
WA_MDAG_STR-AEN03 sy-vline 
WA_MDAG_STR-AEN04 sy-vline 
WA_MDAG_STR-AEN05 sy-vline 
WA_MDAG_STR-FBYTE sy-vline 
WA_MDAG_STR-LIST1 sy-vline 
WA_MDAG_STR-LIST2 sy-vline 
WA_MDAG_STR-DETAIL_ICON sy-vline      INTO ld_text SEPARATED BY SPACE.

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