ABAP Select data from SAP table /DSD/ME_PR_RSFG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /DSD/ME_PR_RSFG 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 /DSD/ME_PR_RSFG. 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 /DSD/ME_PR_RSFG 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_/DSD/ME_PR_RSFG TYPE STANDARD TABLE OF /DSD/ME_PR_RSFG,
      WA_/DSD/ME_PR_RSFG TYPE /DSD/ME_PR_RSFG,
      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: </DSD/ME_PR_RSFG> TYPE /DSD/ME_PR_RSFG.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /DSD/ME_PR_RSFG
  INTO TABLE IT_/DSD/ME_PR_RSFG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /DSD/ME_PR_RSFG
*  INTO TABLE @DATA(IT_/DSD/ME_PR_RSFG2).
*--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_/DSD/ME_PR_RSFG INDEX 1 INTO DATA(WA_/DSD/ME_PR_RSFG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/DSD/ME_PR_RSFG ASSIGNING </DSD/ME_PR_RSFG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</DSD/ME_PR_RSFG>-MANDT = 1.
</DSD/ME_PR_RSFG>-MANDT = 1.
</DSD/ME_PR_RSFG>-PRONR = 1.
</DSD/ME_PR_RSFG>-PRONR = 1.
</DSD/ME_PR_RSFG>-SEQNR = 1.

ENDLOOP.

LOOP AT IT_/DSD/ME_PR_RSFG INTO WA_/DSD/ME_PR_RSFG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/DSD/ME_PR_RSFG-MATNR, sy-vline,
  WA_/DSD/ME_PR_RSFG-SEQNR, sy-vline,
  WA_/DSD/ME_PR_RSFG-MATNR, sy-vline,
  WA_/DSD/ME_PR_RSFG-ZMENG, sy-vline,
  WA_/DSD/ME_PR_RSFG-ZIEME, sy-vline,
  WA_/DSD/ME_PR_RSFG-ZMENG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/DSD/ME_PR_RSFG 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_/DSD/ME_PR_RSFG 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_/DSD/ME_PR_RSFG INTO WA_/DSD/ME_PR_RSFG.


*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 PRONR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/ME_PR_RSFG-PRONR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/ME_PR_RSFG-PRONR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PRONR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/ME_PR_RSFG-PRONR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/ME_PR_RSFG-PRONR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN5, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN5_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/ME_PR_RSFG-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/ME_PR_RSFG-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/ME_PR_RSFG-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/ME_PR_RSFG-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ZIEME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/ME_PR_RSFG-ZIEME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/ME_PR_RSFG-ZIEME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ZIEME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/ME_PR_RSFG-ZIEME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/ME_PR_RSFG-ZIEME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR_LONG
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_/DSD/ME_PR_RSFG-MATNR_LONG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/DSD/ME_PR_RSFG-MATNR_LONG.
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_/DSD/ME_PR_RSFG_STR, 
MANDT TYPE STRING,
MANDT TYPE STRING,
PRONR TYPE STRING,
PRONR TYPE STRING,
SEQNR TYPE STRING,
MATNR TYPE STRING,
SEQNR TYPE STRING,
MATNR TYPE STRING,
ZMENG TYPE STRING,
ZIEME TYPE STRING,
ZMENG TYPE STRING,
ZIEME TYPE STRING,
FREE_EMPTIES TYPE STRING,
EXTFLD1 TYPE STRING,
FREE_EMPTIES TYPE STRING,
EXTFLD1 TYPE STRING,
EXTFLD2 TYPE STRING,
EXTFLD2 TYPE STRING,
EXTFLD3 TYPE STRING,
EXTFLD3 TYPE STRING,
EXTFLD4 TYPE STRING,
EXTFLD4 TYPE STRING,
EXTFLD5 TYPE STRING,
EXTFLD5 TYPE STRING,
EXTFLD6 TYPE STRING,
EXTFLD6 TYPE STRING,
MATNR_LONG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/DSD/ME_PR_RSFG_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_/DSD/ME_PR_RSFG_STR-MANDT sy-vline 
WA_/DSD/ME_PR_RSFG_STR-MANDT sy-vline 
WA_/DSD/ME_PR_RSFG_STR-PRONR sy-vline 
WA_/DSD/ME_PR_RSFG_STR-PRONR sy-vline 
WA_/DSD/ME_PR_RSFG_STR-SEQNR sy-vline 
WA_/DSD/ME_PR_RSFG_STR-MATNR sy-vline 
WA_/DSD/ME_PR_RSFG_STR-SEQNR sy-vline 
WA_/DSD/ME_PR_RSFG_STR-MATNR sy-vline 
WA_/DSD/ME_PR_RSFG_STR-ZMENG sy-vline 
WA_/DSD/ME_PR_RSFG_STR-ZIEME sy-vline 
WA_/DSD/ME_PR_RSFG_STR-ZMENG sy-vline 
WA_/DSD/ME_PR_RSFG_STR-ZIEME sy-vline 
WA_/DSD/ME_PR_RSFG_STR-FREE_EMPTIES sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD1 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-FREE_EMPTIES sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD1 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD2 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD2 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD3 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD3 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD4 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD4 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD5 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD5 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD6 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-EXTFLD6 sy-vline 
WA_/DSD/ME_PR_RSFG_STR-MATNR_LONG sy-vline      INTO ld_text SEPARATED BY SPACE.

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