ABAP Select data from SAP table MRTRSS_API_HDR 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_HDR 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_HDR. 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_HDR 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_HDR TYPE STANDARD TABLE OF MRTRSS_API_HDR,
      WA_MRTRSS_API_HDR TYPE MRTRSS_API_HDR,
      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_HDR> TYPE MRTRSS_API_HDR.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MRTRSS_API_HDR
*  INTO TABLE @DATA(IT_MRTRSS_API_HDR2).
*--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_HDR INDEX 1 INTO DATA(WA_MRTRSS_API_HDR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MRTRSS_API_HDR>-MANDT = 1.
<MRTRSS_API_HDR>-RGUID = 1.
<MRTRSS_API_HDR>-ICNT = 1.
<MRTRSS_API_HDR>-RCNT = 1.
<MRTRSS_API_HDR>-PNGUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MRTRSS_API_HDR-PVGUID, sy-vline,
  WA_MRTRSS_API_HDR-PVCDCNT, sy-vline,
  WA_MRTRSS_API_HDR-NAM, sy-vline,
  WA_MRTRSS_API_HDR-STATUS, sy-vline,
  WA_MRTRSS_API_HDR-VALFROM, sy-vline,
  WA_MRTRSS_API_HDR-VALTO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MRTRSS_API_HDR 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_HDR 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_HDR INTO WA_MRTRSS_API_HDR.


*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 CUNIT, internal->external for field REFUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MRTRSS_API_HDR-REFUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRTRSS_API_HDR-REFUNIT.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field PLNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MRTRSS_API_HDR-PLNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRTRSS_API_HDR-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_HDR-PLNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MRTRSS_API_HDR-PLNAL.
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_HDR_STR, 
MANDT TYPE STRING,
RGUID TYPE STRING,
ICNT TYPE STRING,
RCNT TYPE STRING,
PNGUID TYPE STRING,
PVGUID TYPE STRING,
PVCDCNT TYPE STRING,
NAM TYPE STRING,
STATUS TYPE STRING,
VALFROM TYPE STRING,
VALTO TYPE STRING,
RCP_TIMSTMP TYPE STRING,
RFCDEST TYPE STRING,
REFQUANT TYPE STRING,
REFUNIT TYPE STRING,
WERKS TYPE STRING,
MATNR TYPE STRING,
STLAL TYPE STRING,
VERID TYPE STRING,
STLAN TYPE STRING,
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
ZAEHL TYPE STRING,
PROFIDNETZ TYPE STRING,
STATU TYPE STRING,
VERWE TYPE STRING,
LOEKZ TYPE STRING,
ANDAT TYPE STRING,
ANNAM TYPE STRING,
AEDAT TYPE STRING,
AENAM TYPE STRING,
VBKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MRTRSS_API_HDR_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_HDR_STR-MANDT sy-vline 
WA_MRTRSS_API_HDR_STR-RGUID sy-vline 
WA_MRTRSS_API_HDR_STR-ICNT sy-vline 
WA_MRTRSS_API_HDR_STR-RCNT sy-vline 
WA_MRTRSS_API_HDR_STR-PNGUID sy-vline 
WA_MRTRSS_API_HDR_STR-PVGUID sy-vline 
WA_MRTRSS_API_HDR_STR-PVCDCNT sy-vline 
WA_MRTRSS_API_HDR_STR-NAM sy-vline 
WA_MRTRSS_API_HDR_STR-STATUS sy-vline 
WA_MRTRSS_API_HDR_STR-VALFROM sy-vline 
WA_MRTRSS_API_HDR_STR-VALTO sy-vline 
WA_MRTRSS_API_HDR_STR-RCP_TIMSTMP sy-vline 
WA_MRTRSS_API_HDR_STR-RFCDEST sy-vline 
WA_MRTRSS_API_HDR_STR-REFQUANT sy-vline 
WA_MRTRSS_API_HDR_STR-REFUNIT sy-vline 
WA_MRTRSS_API_HDR_STR-WERKS sy-vline 
WA_MRTRSS_API_HDR_STR-MATNR sy-vline 
WA_MRTRSS_API_HDR_STR-STLAL sy-vline 
WA_MRTRSS_API_HDR_STR-VERID sy-vline 
WA_MRTRSS_API_HDR_STR-STLAN sy-vline 
WA_MRTRSS_API_HDR_STR-PLNTY sy-vline 
WA_MRTRSS_API_HDR_STR-PLNNR sy-vline 
WA_MRTRSS_API_HDR_STR-PLNAL sy-vline 
WA_MRTRSS_API_HDR_STR-ZAEHL sy-vline 
WA_MRTRSS_API_HDR_STR-PROFIDNETZ sy-vline 
WA_MRTRSS_API_HDR_STR-STATU sy-vline 
WA_MRTRSS_API_HDR_STR-VERWE sy-vline 
WA_MRTRSS_API_HDR_STR-LOEKZ sy-vline 
WA_MRTRSS_API_HDR_STR-ANDAT sy-vline 
WA_MRTRSS_API_HDR_STR-ANNAM sy-vline 
WA_MRTRSS_API_HDR_STR-AEDAT sy-vline 
WA_MRTRSS_API_HDR_STR-AENAM sy-vline 
WA_MRTRSS_API_HDR_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.