ABAP Select data from SAP table MAFIELD into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MAFIELD
*  INTO TABLE @DATA(IT_MAFIELD2).
*--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_MAFIELD INDEX 1 INTO DATA(WA_MAFIELD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MAFIELD>-WBEST = 1.
<MAFIELD>-KBEST = 1.
<MAFIELD>-PBEST = 1.
<MAFIELD>-MEINS = 1.
<MAFIELD>-DISPO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MAFIELD-FEVOR, sy-vline,
  WA_MAFIELD-STPRS, sy-vline,
  WA_MAFIELD-PEINH, sy-vline,
  WA_MAFIELD-AUSSS, sy-vline,
  WA_MAFIELD-DZEIT, sy-vline,
  WA_MAFIELD-PLIFZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MAFIELD 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_MAFIELD 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_MAFIELD INTO WA_MAFIELD.


*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 CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MAFIELD-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MAFIELD-MEINS.
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_MAFIELD_STR, 
WBEST TYPE STRING,
KBEST TYPE STRING,
PBEST TYPE STRING,
MEINS TYPE STRING,
DISPO TYPE STRING,
FEVOR TYPE STRING,
STPRS TYPE STRING,
PEINH TYPE STRING,
AUSSS TYPE STRING,
DZEIT TYPE STRING,
PLIFZ TYPE STRING,
WZEIT TYPE STRING,
EISBE TYPE STRING,
XFEHL TYPE STRING,
WAERS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MAFIELD_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_MAFIELD_STR-WBEST sy-vline 
WA_MAFIELD_STR-KBEST sy-vline 
WA_MAFIELD_STR-PBEST sy-vline 
WA_MAFIELD_STR-MEINS sy-vline 
WA_MAFIELD_STR-DISPO sy-vline 
WA_MAFIELD_STR-FEVOR sy-vline 
WA_MAFIELD_STR-STPRS sy-vline 
WA_MAFIELD_STR-PEINH sy-vline 
WA_MAFIELD_STR-AUSSS sy-vline 
WA_MAFIELD_STR-DZEIT sy-vline 
WA_MAFIELD_STR-PLIFZ sy-vline 
WA_MAFIELD_STR-WZEIT sy-vline 
WA_MAFIELD_STR-EISBE sy-vline 
WA_MAFIELD_STR-XFEHL sy-vline 
WA_MAFIELD_STR-WAERS sy-vline      INTO ld_text SEPARATED BY SPACE.

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