ABAP Select data from SAP table MRTRSS_LTXT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MRTRSS_LTXT 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_LTXT. 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_LTXT 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_LTXT TYPE STANDARD TABLE OF MRTRSS_LTXT,
      WA_MRTRSS_LTXT TYPE MRTRSS_LTXT,
      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_LTXT> TYPE MRTRSS_LTXT.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRTRSS_LTXT
*  INTO TABLE @DATA(IT_MRTRSS_LTXT2).
*--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_LTXT INDEX 1 INTO DATA(WA_MRTRSS_LTXT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRTRSS_LTXT>-AKTYP = 1.
<MRTRSS_LTXT>-OBJECT = 1.
<MRTRSS_LTXT>-PLNTY = 1.
<MRTRSS_LTXT>-PLNNR = 1.
<MRTRSS_LTXT>-PLNAL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRTRSS_LTXT-PLNFL, sy-vline,
  WA_MRTRSS_LTXT-VORNR, sy-vline,
  WA_MRTRSS_LTXT-VORKN, sy-vline,
  WA_MRTRSS_LTXT-UVORN, sy-vline,
  WA_MRTRSS_LTXT-UVOKN, sy-vline,
  WA_MRTRSS_LTXT-PSNFH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRTRSS_LTXT 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_LTXT 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_LTXT INTO WA_MRTRSS_LTXT.


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

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

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

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

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

*Conversion exit ISOLA, internal->external for field TDSPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MRTRSS_LTXT-TDSPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRTRSS_LTXT-TDSPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field TDOSPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MRTRSS_LTXT-TDOSPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRTRSS_LTXT-TDOSPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MRTRSS_LTXT-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRTRSS_LTXT-LOGSYS.
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_LTXT_STR, 
AKTYP TYPE STRING,
OBJECT TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
PLNFL TYPE STRING,
VORNR TYPE STRING,
VORKN TYPE STRING,
UVORN TYPE STRING,
UVOKN TYPE STRING,
PSNFH TYPE STRING,
PZLFH TYPE STRING,
PLNFT TYPE STRING,
MKMZL TYPE STRING,
KZEINSTELL TYPE STRING,
MERKNR TYPE STRING,
HEADER TYPE STRING,
TDOBJECT TYPE STRING,
TDNAME TYPE STRING,
TDID TYPE STRING,
TDSPRAS TYPE STRING,
TDTITLE TYPE STRING,
TDFORM TYPE STRING,
TDSTYLE TYPE STRING,
TDVERSION TYPE STRING,
TDFUSER TYPE STRING,
TDFRELES TYPE STRING,
TDFDATE TYPE STRING,
TDFTIME TYPE STRING,
TDLUSER TYPE STRING,
TDLRELES TYPE STRING,
TDLDATE TYPE STRING,
TDLTIME TYPE STRING,
TDLINESIZE TYPE STRING,
TDTXTLINES TYPE STRING,
TDHYPHENAT TYPE STRING,
TDOSPRAS TYPE STRING,
TDTRANSTAT TYPE STRING,
TDMACODE1 TYPE STRING,
TDMACODE2 TYPE STRING,
TDREFOBJ TYPE STRING,
TDREFNAME TYPE STRING,
TDREFID TYPE STRING,
TDTEXTTYPE TYPE STRING,
TDCOMPRESS TYPE STRING,
MANDT TYPE STRING,
TDOCLASS TYPE STRING,
LOGSYS TYPE STRING,
T_TLINE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRTRSS_LTXT_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_LTXT_STR-AKTYP sy-vline 
WA_MRTRSS_LTXT_STR-OBJECT sy-vline 
WA_MRTRSS_LTXT_STR-PLNTY sy-vline 
WA_MRTRSS_LTXT_STR-PLNNR sy-vline 
WA_MRTRSS_LTXT_STR-PLNAL sy-vline 
WA_MRTRSS_LTXT_STR-PLNFL sy-vline 
WA_MRTRSS_LTXT_STR-VORNR sy-vline 
WA_MRTRSS_LTXT_STR-VORKN sy-vline 
WA_MRTRSS_LTXT_STR-UVORN sy-vline 
WA_MRTRSS_LTXT_STR-UVOKN sy-vline 
WA_MRTRSS_LTXT_STR-PSNFH sy-vline 
WA_MRTRSS_LTXT_STR-PZLFH sy-vline 
WA_MRTRSS_LTXT_STR-PLNFT sy-vline 
WA_MRTRSS_LTXT_STR-MKMZL sy-vline 
WA_MRTRSS_LTXT_STR-KZEINSTELL sy-vline 
WA_MRTRSS_LTXT_STR-MERKNR sy-vline 
WA_MRTRSS_LTXT_STR-HEADER sy-vline 
WA_MRTRSS_LTXT_STR-TDOBJECT sy-vline 
WA_MRTRSS_LTXT_STR-TDNAME sy-vline 
WA_MRTRSS_LTXT_STR-TDID sy-vline 
WA_MRTRSS_LTXT_STR-TDSPRAS sy-vline 
WA_MRTRSS_LTXT_STR-TDTITLE sy-vline 
WA_MRTRSS_LTXT_STR-TDFORM sy-vline 
WA_MRTRSS_LTXT_STR-TDSTYLE sy-vline 
WA_MRTRSS_LTXT_STR-TDVERSION sy-vline 
WA_MRTRSS_LTXT_STR-TDFUSER sy-vline 
WA_MRTRSS_LTXT_STR-TDFRELES sy-vline 
WA_MRTRSS_LTXT_STR-TDFDATE sy-vline 
WA_MRTRSS_LTXT_STR-TDFTIME sy-vline 
WA_MRTRSS_LTXT_STR-TDLUSER sy-vline 
WA_MRTRSS_LTXT_STR-TDLRELES sy-vline 
WA_MRTRSS_LTXT_STR-TDLDATE sy-vline 
WA_MRTRSS_LTXT_STR-TDLTIME sy-vline 
WA_MRTRSS_LTXT_STR-TDLINESIZE sy-vline 
WA_MRTRSS_LTXT_STR-TDTXTLINES sy-vline 
WA_MRTRSS_LTXT_STR-TDHYPHENAT sy-vline 
WA_MRTRSS_LTXT_STR-TDOSPRAS sy-vline 
WA_MRTRSS_LTXT_STR-TDTRANSTAT sy-vline 
WA_MRTRSS_LTXT_STR-TDMACODE1 sy-vline 
WA_MRTRSS_LTXT_STR-TDMACODE2 sy-vline 
WA_MRTRSS_LTXT_STR-TDREFOBJ sy-vline 
WA_MRTRSS_LTXT_STR-TDREFNAME sy-vline 
WA_MRTRSS_LTXT_STR-TDREFID sy-vline 
WA_MRTRSS_LTXT_STR-TDTEXTTYPE sy-vline 
WA_MRTRSS_LTXT_STR-TDCOMPRESS sy-vline 
WA_MRTRSS_LTXT_STR-MANDT sy-vline 
WA_MRTRSS_LTXT_STR-TDOCLASS sy-vline 
WA_MRTRSS_LTXT_STR-LOGSYS sy-vline 
WA_MRTRSS_LTXT_STR-T_TLINE sy-vline      INTO ld_text SEPARATED BY SPACE.

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