ABAP Select data from SAP table MRTRSS_PLFT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRTRSS_PLFT
*  INTO TABLE @DATA(IT_MRTRSS_PLFT2).
*--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_MRTRSS_PLFT INDEX 1 INTO DATA(WA_MRTRSS_PLFT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRTRSS_PLFT>-PLNAL = 1.
<MRTRSS_PLFT>-FLG_SEL = 1.
<MRTRSS_PLFT>-MANDT = 1.
<MRTRSS_PLFT>-PLNTY = 1.
<MRTRSS_PLFT>-PLNNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRTRSS_PLFT-PLNKN, sy-vline,
  WA_MRTRSS_PLFT-PLNPH, sy-vline,
  WA_MRTRSS_PLFT-PLNFT, sy-vline,
  WA_MRTRSS_PLFT-ZAEHL, sy-vline,
  WA_MRTRSS_PLFT-DATUV, sy-vline,
  WA_MRTRSS_PLFT-LOEKZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRTRSS_PLFT 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_MRTRSS_PLFT 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_MRTRSS_PLFT INTO WA_MRTRSS_PLFT.


*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 PLNAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MRTRSS_PLFT-PLNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRTRSS_PLFT-PLNAL.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit NUMCV, internal->external for field FTRNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MRTRSS_PLFT-FTRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRTRSS_PLFT-FTRNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AENNR_AUS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MRTRSS_PLFT-AENNR_AUS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRTRSS_PLFT-AENNR_AUS.
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_MRTRSS_PLFT_STR, 
PLNAL TYPE STRING,
FLG_SEL TYPE STRING,
MANDT TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNKN TYPE STRING,
PLNPH TYPE STRING,
PLNFT TYPE STRING,
ZAEHL TYPE STRING,
DATUV TYPE STRING,
LOEKZ TYPE STRING,
AENNR TYPE STRING,
ANDAT TYPE STRING,
ANNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
WERKS TYPE STRING,
FTRNR TYPE STRING,
CSTYP TYPE STRING,
COSTR TYPE STRING,
CSKTX TYPE STRING,
FTTYP TYPE STRING,
VALID_TO TYPE STRING,
LOEKZ_INHERITED TYPE STRING,
VBKZ TYPE STRING,
DATUB TYPE STRING,
AENNR_AUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRTRSS_PLFT_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_MRTRSS_PLFT_STR-PLNAL sy-vline 
WA_MRTRSS_PLFT_STR-FLG_SEL sy-vline 
WA_MRTRSS_PLFT_STR-MANDT sy-vline 
WA_MRTRSS_PLFT_STR-PLNTY sy-vline 
WA_MRTRSS_PLFT_STR-PLNNR sy-vline 
WA_MRTRSS_PLFT_STR-PLNKN sy-vline 
WA_MRTRSS_PLFT_STR-PLNPH sy-vline 
WA_MRTRSS_PLFT_STR-PLNFT sy-vline 
WA_MRTRSS_PLFT_STR-ZAEHL sy-vline 
WA_MRTRSS_PLFT_STR-DATUV sy-vline 
WA_MRTRSS_PLFT_STR-LOEKZ sy-vline 
WA_MRTRSS_PLFT_STR-AENNR sy-vline 
WA_MRTRSS_PLFT_STR-ANDAT sy-vline 
WA_MRTRSS_PLFT_STR-ANNAM sy-vline 
WA_MRTRSS_PLFT_STR-AEDAT sy-vline 
WA_MRTRSS_PLFT_STR-AENAM sy-vline 
WA_MRTRSS_PLFT_STR-WERKS sy-vline 
WA_MRTRSS_PLFT_STR-FTRNR sy-vline 
WA_MRTRSS_PLFT_STR-CSTYP sy-vline 
WA_MRTRSS_PLFT_STR-COSTR sy-vline 
WA_MRTRSS_PLFT_STR-CSKTX sy-vline 
WA_MRTRSS_PLFT_STR-FTTYP sy-vline 
WA_MRTRSS_PLFT_STR-VALID_TO sy-vline 
WA_MRTRSS_PLFT_STR-LOEKZ_INHERITED sy-vline 
WA_MRTRSS_PLFT_STR-VBKZ sy-vline 
WA_MRTRSS_PLFT_STR-DATUB sy-vline 
WA_MRTRSS_PLFT_STR-AENNR_AUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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