ABAP Select data from SAP table FMWF_MDRUL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM FMWF_MDRUL
*  INTO TABLE @DATA(IT_FMWF_MDRUL2).
*--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_FMWF_MDRUL INDEX 1 INTO DATA(WA_FMWF_MDRUL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<FMWF_MDRUL>-MANDT = 1.
<FMWF_MDRUL>-WFLEVEL = 1.
<FMWF_MDRUL>-DOCCLASS = 1.
<FMWF_MDRUL>-ACTIVITY = 1.
<FMWF_MDRUL>-FIKRS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_FMWF_MDRUL-GJAHR, sy-vline,
  WA_FMWF_MDRUL-BUDGETGRP, sy-vline,
  WA_FMWF_MDRUL-AMOUNTGRP, sy-vline,
  WA_FMWF_MDRUL-OTYPE, sy-vline,
  WA_FMWF_MDRUL-OBJID, sy-vline,
  WA_FMWF_MDRUL-SMRULES, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_FMWF_MDRUL 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_FMWF_MDRUL 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_FMWF_MDRUL INTO WA_FMWF_MDRUL.


*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 GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_FMWF_MDRUL-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_FMWF_MDRUL-GJAHR.
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_FMWF_MDRUL_STR, 
MANDT TYPE STRING,
WFLEVEL TYPE STRING,
DOCCLASS TYPE STRING,
ACTIVITY TYPE STRING,
FIKRS TYPE STRING,
GJAHR TYPE STRING,
BUDGETGRP TYPE STRING,
AMOUNTGRP TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
SMRULES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_FMWF_MDRUL_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_FMWF_MDRUL_STR-MANDT sy-vline 
WA_FMWF_MDRUL_STR-WFLEVEL sy-vline 
WA_FMWF_MDRUL_STR-DOCCLASS sy-vline 
WA_FMWF_MDRUL_STR-ACTIVITY sy-vline 
WA_FMWF_MDRUL_STR-FIKRS sy-vline 
WA_FMWF_MDRUL_STR-GJAHR sy-vline 
WA_FMWF_MDRUL_STR-BUDGETGRP sy-vline 
WA_FMWF_MDRUL_STR-AMOUNTGRP sy-vline 
WA_FMWF_MDRUL_STR-OTYPE sy-vline 
WA_FMWF_MDRUL_STR-OBJID sy-vline 
WA_FMWF_MDRUL_STR-SMRULES sy-vline      INTO ld_text SEPARATED BY SPACE.

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