ABAP Select data from SAP table M_FMREI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM M_FMREI
*  INTO TABLE @DATA(IT_M_FMREI2).
*--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_M_FMREI INDEX 1 INTO DATA(WA_M_FMREI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<M_FMREI>-MANDT = 1.
<M_FMREI>-BLART = 1.
<M_FMREI>-BELNR_LP = 1.
<M_FMREI>-BLPOS = 1.
<M_FMREI>-FIKRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_M_FMREI-BUKRS, sy-vline,
  WA_M_FMREI-FIPOS, sy-vline,
  WA_M_FMREI-FIPEX, sy-vline,
  WA_M_FMREI-FISTL, sy-vline,
  WA_M_FMREI-GEBER, sy-vline,
  WA_M_FMREI-WAERS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_M_FMREI 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_M_FMREI 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_M_FMREI INTO WA_M_FMREI.


*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 ALPHA, internal->external for field BELNR_LP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_M_FMREI-BELNR_LP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_FMREI-BELNR_LP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit FMCIS, internal->external for field FIPOS
CALL FUNCTION 'CONVERSION_EXIT_FMCIS_OUTPUT'
  EXPORTING
    input =                      WA_M_FMREI-FIPOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_FMREI-FIPOS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit FMCIL, internal->external for field FIPEX
CALL FUNCTION 'CONVERSION_EXIT_FMCIL_OUTPUT'
  EXPORTING
    input =                      WA_M_FMREI-FIPEX
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_M_FMREI-FIPEX.
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_M_FMREI_STR, 
MANDT TYPE STRING,
BLART TYPE STRING,
BELNR_LP TYPE STRING,
BLPOS TYPE STRING,
FIKRS TYPE STRING,
BUKRS TYPE STRING,
FIPOS TYPE STRING,
FIPEX TYPE STRING,
FISTL TYPE STRING,
GEBER TYPE STRING,
WAERS TYPE STRING,
BLDAT TYPE STRING,
PAYBUDGET TYPE STRING,
COMBUDGET TYPE STRING,
KTEXT TYPE STRING,
BLTYP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_M_FMREI_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_M_FMREI_STR-MANDT sy-vline 
WA_M_FMREI_STR-BLART sy-vline 
WA_M_FMREI_STR-BELNR_LP sy-vline 
WA_M_FMREI_STR-BLPOS sy-vline 
WA_M_FMREI_STR-FIKRS sy-vline 
WA_M_FMREI_STR-BUKRS sy-vline 
WA_M_FMREI_STR-FIPOS sy-vline 
WA_M_FMREI_STR-FIPEX sy-vline 
WA_M_FMREI_STR-FISTL sy-vline 
WA_M_FMREI_STR-GEBER sy-vline 
WA_M_FMREI_STR-WAERS sy-vline 
WA_M_FMREI_STR-BLDAT sy-vline 
WA_M_FMREI_STR-PAYBUDGET sy-vline 
WA_M_FMREI_STR-COMBUDGET sy-vline 
WA_M_FMREI_STR-KTEXT sy-vline 
WA_M_FMREI_STR-BLTYP sy-vline      INTO ld_text SEPARATED BY SPACE.

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