ABAP Select data from SAP table MTR_S_TRAVEL_SERVICE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MTR_S_TRAVEL_SERVICE
*  INTO TABLE @DATA(IT_MTR_S_TRAVEL_SERVICE2).
*--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_MTR_S_TRAVEL_SERVICE INDEX 1 INTO DATA(WA_MTR_S_TRAVEL_SERVICE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MTR_S_TRAVEL_SERVICE>-PERNR = 1.
<MTR_S_TRAVEL_SERVICE>-TRIPNO = 1.
<MTR_S_TRAVEL_SERVICE>-REQUEST_TYPE_NAME = 1.
<MTR_S_TRAVEL_SERVICE>-RETURN_POSSIBLE = 1.
<MTR_S_TRAVEL_SERVICE>-DISPLAY_MODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MTR_S_TRAVEL_SERVICE-EDIT_VISIBLE, sy-vline,
  WA_MTR_S_TRAVEL_SERVICE-CRITICALITY, sy-vline,
  WA_MTR_S_TRAVEL_SERVICE-REQUEST, sy-vline,
  WA_MTR_S_TRAVEL_SERVICE-REQUEST_TYPE, sy-vline,
  WA_MTR_S_TRAVEL_SERVICE-DATE_BEG, sy-vline,
  WA_MTR_S_TRAVEL_SERVICE-TIME_BEG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MTR_S_TRAVEL_SERVICE 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_MTR_S_TRAVEL_SERVICE 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_MTR_S_TRAVEL_SERVICE INTO WA_MTR_S_TRAVEL_SERVICE.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MTR_S_TRAVEL_SERVICE_STR, 
PERNR TYPE STRING,
TRIPNO TYPE STRING,
REQUEST_TYPE_NAME TYPE STRING,
RETURN_POSSIBLE TYPE STRING,
DISPLAY_MODE TYPE STRING,
EDIT_VISIBLE TYPE STRING,
CRITICALITY TYPE STRING,
REQUEST TYPE STRING,
REQUEST_TYPE TYPE STRING,
DATE_BEG TYPE STRING,
TIME_BEG TYPE STRING,
DATE_END TYPE STRING,
TIME_END TYPE STRING,
LOCATION_BEG TYPE STRING,
COUNTRY_BEG TYPE STRING,
COUNTRY_BEG_NAME TYPE STRING,
LOCATION_END TYPE STRING,
COUNTRY_END TYPE STRING,
COUNTRY_END_NAME TYPE STRING,
DEP_ARR TYPE STRING,
OFFICE_FIND TYPE STRING,
OS_CODE TYPE STRING,
LOC_BEG_IATA TYPE STRING,
LOC_END_IATA TYPE STRING,
OS_STATUS TYPE STRING,
OS_CONF_NUMBER TYPE STRING,
PRICE TYPE STRING,
CURRENCY TYPE STRING,
COMMENT1 TYPE STRING,
DATE_BEG_FC TYPE STRING,
TIME_BEG_FC TYPE STRING,
DATE_END_FC TYPE STRING,
TIME_END_FC TYPE STRING,
LOCATION_BEG_FC TYPE STRING,
COUNTRY_BEG_FC TYPE STRING,
COUNTRY_BEG_NAME_FC TYPE STRING,
LOCATION_END_FC TYPE STRING,
COUNTRY_END_FC TYPE STRING,
COUNTRY_END_NAME_FC TYPE STRING,
DEP_ARR_FC TYPE STRING,
OS_CODE_FC TYPE STRING,
LOC_BEG_IATA_FC TYPE STRING,
LOC_END_IATA_FC TYPE STRING,
OS_STATUS_FC TYPE STRING,
OS_CONF_NUMBER_FC TYPE STRING,
PRICE_FC TYPE STRING,
CURRENCY_FC TYPE STRING,
COMMENT1_FC TYPE STRING,
DUMMY_TRAVEL_SERVICE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MTR_S_TRAVEL_SERVICE_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_MTR_S_TRAVEL_SERVICE_STR-PERNR sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-TRIPNO sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-REQUEST_TYPE_NAME sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-RETURN_POSSIBLE sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-DISPLAY_MODE sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-EDIT_VISIBLE sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-CRITICALITY sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-REQUEST sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-REQUEST_TYPE sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-DATE_BEG sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-TIME_BEG sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-DATE_END sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-TIME_END sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-LOCATION_BEG sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-COUNTRY_BEG sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-COUNTRY_BEG_NAME sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-LOCATION_END sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-COUNTRY_END sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-COUNTRY_END_NAME sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-DEP_ARR sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-OFFICE_FIND sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-OS_CODE sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-LOC_BEG_IATA sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-LOC_END_IATA sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-OS_STATUS sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-OS_CONF_NUMBER sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-PRICE sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-CURRENCY sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-COMMENT1 sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-DATE_BEG_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-TIME_BEG_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-DATE_END_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-TIME_END_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-LOCATION_BEG_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-COUNTRY_BEG_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-COUNTRY_BEG_NAME_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-LOCATION_END_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-COUNTRY_END_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-COUNTRY_END_NAME_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-DEP_ARR_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-OS_CODE_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-LOC_BEG_IATA_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-LOC_END_IATA_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-OS_STATUS_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-OS_CONF_NUMBER_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-PRICE_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-CURRENCY_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-COMMENT1_FC sy-vline 
WA_MTR_S_TRAVEL_SERVICE_STR-DUMMY_TRAVEL_SERVICE sy-vline      INTO ld_text SEPARATED BY SPACE.

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