ABAP Select data from SAP table MRTRSS_API_STRREL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MRTRSS_API_STRREL 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_API_STRREL. 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_API_STRREL 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_API_STRREL TYPE STANDARD TABLE OF MRTRSS_API_STRREL,
      WA_MRTRSS_API_STRREL TYPE MRTRSS_API_STRREL,
      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_API_STRREL> TYPE MRTRSS_API_STRREL.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRTRSS_API_STRREL
*  INTO TABLE @DATA(IT_MRTRSS_API_STRREL2).
*--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_API_STRREL INDEX 1 INTO DATA(WA_MRTRSS_API_STRREL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRTRSS_API_STRREL>-MANDT = 1.
<MRTRSS_API_STRREL>-STRREL_GUID = 1.
<MRTRSS_API_STRREL>-STRREL_CNT = 1.
<MRTRSS_API_STRREL>-STREAM_GUID = 1.
<MRTRSS_API_STRREL>-FRM_GUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRTRSS_API_STRREL-ITEM_GUID, sy-vline,
  WA_MRTRSS_API_STRREL-POPREL_GUID, sy-vline,
  WA_MRTRSS_API_STRREL-POPREL_CNT, sy-vline,
  WA_MRTRSS_API_STRREL-LOEKZ, sy-vline,
  WA_MRTRSS_API_STRREL-ANDAT, sy-vline,
  WA_MRTRSS_API_STRREL-ANNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRTRSS_API_STRREL 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_API_STRREL 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_API_STRREL INTO WA_MRTRSS_API_STRREL.


*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_API_STRREL-PLNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRTRSS_API_STRREL-PLNNR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit NUMCV, internal->external for field VORNR_MAST
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_MRTRSS_API_STRREL-VORNR_MAST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRTRSS_API_STRREL-VORNR_MAST.
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_API_STRREL_STR, 
MANDT TYPE STRING,
STRREL_GUID TYPE STRING,
STRREL_CNT TYPE STRING,
STREAM_GUID TYPE STRING,
FRM_GUID TYPE STRING,
ITEM_GUID TYPE STRING,
POPREL_GUID TYPE STRING,
POPREL_CNT TYPE STRING,
LOEKZ TYPE STRING,
ANDAT TYPE STRING,
ANNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
VORNR TYPE STRING,
VORNR_MAST TYPE STRING,
PLNKN_MAST TYPE STRING,
POBNR_MAST TYPE STRING,
GUID_MAST TYPE STRING,
VBKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRTRSS_API_STRREL_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_API_STRREL_STR-MANDT sy-vline 
WA_MRTRSS_API_STRREL_STR-STRREL_GUID sy-vline 
WA_MRTRSS_API_STRREL_STR-STRREL_CNT sy-vline 
WA_MRTRSS_API_STRREL_STR-STREAM_GUID sy-vline 
WA_MRTRSS_API_STRREL_STR-FRM_GUID sy-vline 
WA_MRTRSS_API_STRREL_STR-ITEM_GUID sy-vline 
WA_MRTRSS_API_STRREL_STR-POPREL_GUID sy-vline 
WA_MRTRSS_API_STRREL_STR-POPREL_CNT sy-vline 
WA_MRTRSS_API_STRREL_STR-LOEKZ sy-vline 
WA_MRTRSS_API_STRREL_STR-ANDAT sy-vline 
WA_MRTRSS_API_STRREL_STR-ANNAM sy-vline 
WA_MRTRSS_API_STRREL_STR-AEDAT sy-vline 
WA_MRTRSS_API_STRREL_STR-AENAM sy-vline 
WA_MRTRSS_API_STRREL_STR-PLNTY sy-vline 
WA_MRTRSS_API_STRREL_STR-PLNNR sy-vline 
WA_MRTRSS_API_STRREL_STR-PLNAL sy-vline 
WA_MRTRSS_API_STRREL_STR-VORNR sy-vline 
WA_MRTRSS_API_STRREL_STR-VORNR_MAST sy-vline 
WA_MRTRSS_API_STRREL_STR-PLNKN_MAST sy-vline 
WA_MRTRSS_API_STRREL_STR-POBNR_MAST sy-vline 
WA_MRTRSS_API_STRREL_STR-GUID_MAST sy-vline 
WA_MRTRSS_API_STRREL_STR-VBKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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