ABAP Select data from SAP table /MRSS/T_R3_APPOINTMENT_EXT into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /MRSS/T_R3_APPOINTMENT_EXT 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 /MRSS/T_R3_APPOINTMENT_EXT. 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 /MRSS/T_R3_APPOINTMENT_EXT 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_/MRSS/T_R3_APPOINTMENT_EXT TYPE STANDARD TABLE OF /MRSS/T_R3_APPOINTMENT_EXT,
      WA_/MRSS/T_R3_APPOINTMENT_EXT TYPE /MRSS/T_R3_APPOINTMENT_EXT,
      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: </MRSS/T_R3_APPOINTMENT_EXT> TYPE /MRSS/T_R3_APPOINTMENT_EXT.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/MRSS/T_R3_APPOINTMENT_EXT.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /MRSS/T_R3_APPOINTMENT_EXT
  INTO TABLE IT_/MRSS/T_R3_APPOINTMENT_EXT.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/T_R3_APPOINTMENT_EXT
*  INTO TABLE @DATA(IT_/MRSS/T_R3_APPOINTMENT_EXT2).
*--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_/MRSS/T_R3_APPOINTMENT_EXT INDEX 1 INTO DATA(WA_/MRSS/T_R3_APPOINTMENT_EXT2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/MRSS/T_R3_APPOINTMENT_EXT ASSIGNING </MRSS/T_R3_APPOINTMENT_EXT>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/T_R3_APPOINTMENT_EXT>-EXT_KEY = 1.
</MRSS/T_R3_APPOINTMENT_EXT>-RESOURCE_KEY = 1.
</MRSS/T_R3_APPOINTMENT_EXT>-RESOURCE_NAME = 1.
</MRSS/T_R3_APPOINTMENT_EXT>-RESOURCE_NUMBER = 1.
</MRSS/T_R3_APPOINTMENT_EXT>-IS_EXTERNAL = 1.

ENDLOOP.

LOOP AT IT_/MRSS/T_R3_APPOINTMENT_EXT INTO WA_/MRSS/T_R3_APPOINTMENT_EXT.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/T_R3_APPOINTMENT_EXT-IS_PREFERRED_TECH, sy-vline,
  WA_/MRSS/T_R3_APPOINTMENT_EXT-SERVICE_AREA_KEY, sy-vline,
  WA_/MRSS/T_R3_APPOINTMENT_EXT-SERVICE_AREA_NAME, sy-vline,
  WA_/MRSS/T_R3_APPOINTMENT_EXT-RESOURCE_PRIORITY, sy-vline,
  WA_/MRSS/T_R3_APPOINTMENT_EXT-BEG_TSTMP, sy-vline,
  WA_/MRSS/T_R3_APPOINTMENT_EXT-END_TSTMP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/T_R3_APPOINTMENT_EXT 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_/MRSS/T_R3_APPOINTMENT_EXT 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_/MRSS/T_R3_APPOINTMENT_EXT INTO WA_/MRSS/T_R3_APPOINTMENT_EXT.


*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 DEMAND_DURATION_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_R3_APPOINTMENT_EXT-DEMAND_DURATION_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_R3_APPOINTMENT_EXT-DEMAND_DURATION_UNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NUMBER_OF_SLOTS_REQUIRED
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_R3_APPOINTMENT_EXT-NUMBER_OF_SLOTS_REQUIRED
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_R3_APPOINTMENT_EXT-NUMBER_OF_SLOTS_REQUIRED.
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_/MRSS/T_R3_APPOINTMENT_EXT_STR, 
EXT_KEY TYPE STRING,
RESOURCE_KEY TYPE STRING,
RESOURCE_NAME TYPE STRING,
RESOURCE_NUMBER TYPE STRING,
IS_EXTERNAL TYPE STRING,
IS_PREFERRED_TECH TYPE STRING,
SERVICE_AREA_KEY TYPE STRING,
SERVICE_AREA_NAME TYPE STRING,
RESOURCE_PRIORITY TYPE STRING,
BEG_TSTMP TYPE STRING,
END_TSTMP TYPE STRING,
DEMAND_DURATION TYPE STRING,
DEMAND_DURATION_UNIT TYPE STRING,
WEEKDAY TYPE STRING,
NUMBER_OF_SLOTS_REQUIRED TYPE STRING,
CAPACITY_LIMIT TYPE STRING,
OVERBOOK_LIMIT TYPE STRING,
CONSUMED_CAPACITY TYPE STRING,
REMAINING_CAPACITY TYPE STRING,
TOTAL TYPE STRING,
QUALIF TYPE STRING,
IS_MAND_QUALIF_OK TYPE STRING,
ROUGH_DISTANCE TYPE STRING,
ROUGH_DISTANCE_UNIT TYPE STRING,
ROUGH_TRAVEL_DURATION TYPE STRING,
ROUGH_TRAVEL_DURATION_UNIT TYPE STRING,
SOLUTION_ID TYPE STRING,
OVERBOOKED TYPE STRING,
APPT_EARL_START TYPE STRING,
APPT_LAT_START TYPE STRING,
APPT_EARL_END TYPE STRING,
APPT_LAT_END TYPE STRING,
EARLIEST_START_DATE TYPE STRING,
EARLIEST_START_TIME TYPE STRING,
LATEST_START_DATE TYPE STRING,
LATEST_START_TIME TYPE STRING,
EARLIEST_FINISH_DATE TYPE STRING,
EARLIEST_FINISH_TIME TYPE STRING,
LATEST_FINISH_DATE TYPE STRING,
LATEST_FINISH_TIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/T_R3_APPOINTMENT_EXT_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_/MRSS/T_R3_APPOINTMENT_EXT_STR-EXT_KEY sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-RESOURCE_KEY sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-RESOURCE_NAME sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-RESOURCE_NUMBER sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-IS_EXTERNAL sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-IS_PREFERRED_TECH sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-SERVICE_AREA_KEY sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-SERVICE_AREA_NAME sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-RESOURCE_PRIORITY sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-BEG_TSTMP sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-END_TSTMP sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-DEMAND_DURATION sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-DEMAND_DURATION_UNIT sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-WEEKDAY sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-NUMBER_OF_SLOTS_REQUIRED sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-CAPACITY_LIMIT sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-OVERBOOK_LIMIT sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-CONSUMED_CAPACITY sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-REMAINING_CAPACITY sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-TOTAL sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-QUALIF sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-IS_MAND_QUALIF_OK sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-ROUGH_DISTANCE sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-ROUGH_DISTANCE_UNIT sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-ROUGH_TRAVEL_DURATION sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-ROUGH_TRAVEL_DURATION_UNIT sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-SOLUTION_ID sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-OVERBOOKED sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-APPT_EARL_START sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-APPT_LAT_START sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-APPT_EARL_END sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-APPT_LAT_END sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-EARLIEST_START_DATE sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-EARLIEST_START_TIME sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-LATEST_START_DATE sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-LATEST_START_TIME sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-EARLIEST_FINISH_DATE sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-EARLIEST_FINISH_TIME sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-LATEST_FINISH_DATE sy-vline 
WA_/MRSS/T_R3_APPOINTMENT_EXT_STR-LATEST_FINISH_TIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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