ABAP Select data from SAP table /MRSS/T_API_ASSIGNMENT_UPDATE 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_API_ASSIGNMENT_UPDATE 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_API_ASSIGNMENT_UPDATE. 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_API_ASSIGNMENT_UPDATE 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_API_ASSIGNMENT_UPDATE TYPE STANDARD TABLE OF /MRSS/T_API_ASSIGNMENT_UPDATE,
      WA_/MRSS/T_API_ASSIGNMENT_UPDATE TYPE /MRSS/T_API_ASSIGNMENT_UPDATE,
      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_API_ASSIGNMENT_UPDATE> TYPE /MRSS/T_API_ASSIGNMENT_UPDATE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/T_API_ASSIGNMENT_UPDATE
*  INTO TABLE @DATA(IT_/MRSS/T_API_ASSIGNMENT_UPDATE2).
*--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_API_ASSIGNMENT_UPDATE INDEX 1 INTO DATA(WA_/MRSS/T_API_ASSIGNMENT_UPDATE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/T_API_ASSIGNMENT_UPDATE>-ASSIGNMENT_KEY = 1.
</MRSS/T_API_ASSIGNMENT_UPDATE>-RESOURCE_KEY = 1.
</MRSS/T_API_ASSIGNMENT_UPDATE>-BEG_TSTMP = 1.
</MRSS/T_API_ASSIGNMENT_UPDATE>-END_TSTMP = 1.
</MRSS/T_API_ASSIGNMENT_UPDATE>-DURATION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/T_API_ASSIGNMENT_UPDATE-ASSIGNMENT_TYPE, sy-vline,
  WA_/MRSS/T_API_ASSIGNMENT_UPDATE-UTIL, sy-vline,
  WA_/MRSS/T_API_ASSIGNMENT_UPDATE-STATUS_TAB, sy-vline,
  WA_/MRSS/T_API_ASSIGNMENT_UPDATE-DESCRIPTION, sy-vline,
  WA_/MRSS/T_API_ASSIGNMENT_UPDATE-SUPERVISOR, sy-vline,
  WA_/MRSS/T_API_ASSIGNMENT_UPDATE-NO_TRAVEL_COST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/T_API_ASSIGNMENT_UPDATE 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_API_ASSIGNMENT_UPDATE 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_API_ASSIGNMENT_UPDATE INTO WA_/MRSS/T_API_ASSIGNMENT_UPDATE.


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

*Conversion exit CUNIT, internal->external for field TRV_FRM_DUR_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_API_ASSIGNMENT_UPDATE-TRV_FRM_DUR_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_API_ASSIGNMENT_UPDATE-TRV_FRM_DUR_UNIT.
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_API_ASSIGNMENT_UPDATE_STR, 
ASSIGNMENT_KEY TYPE STRING,
RESOURCE_KEY TYPE STRING,
BEG_TSTMP TYPE STRING,
END_TSTMP TYPE STRING,
DURATION TYPE STRING,
ASSIGNMENT_TYPE TYPE STRING,
UTIL TYPE STRING,
STATUS_TAB TYPE STRING,
DESCRIPTION TYPE STRING,
SUPERVISOR TYPE STRING,
NO_TRAVEL_COST TYPE STRING,
ASS_PROB TYPE STRING,
EBD TYPE STRING,
PARENT_GUID TYPE STRING,
TIME_RULE_ID TYPE STRING,
IS_RES_FIXED TYPE STRING,
IS_DATE_FIXED TYPE STRING,
TRV_TO_BEGIN TYPE STRING,
TRV_TO_END TYPE STRING,
TRV_TO_DURATION TYPE STRING,
TRV_TO_DUR_UNIT TYPE STRING,
TRV_TO_DISTANCE TYPE STRING,
TRV_TO_MANU_SET TYPE STRING,
TRV_FRM_BEGIN TYPE STRING,
TRV_FRM_END TYPE STRING,
TRV_FRM_DURATION TYPE STRING,
TRV_FRM_DUR_UNIT TYPE STRING,
TRV_FRM_DISTANCE TYPE STRING,
TRV_FRM_MANU_SET TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/T_API_ASSIGNMENT_UPDATE_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_API_ASSIGNMENT_UPDATE_STR-ASSIGNMENT_KEY sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-RESOURCE_KEY sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-BEG_TSTMP sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-END_TSTMP sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-DURATION sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-ASSIGNMENT_TYPE sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-UTIL sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-STATUS_TAB sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-DESCRIPTION sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-SUPERVISOR sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-NO_TRAVEL_COST sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-ASS_PROB sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-EBD sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-PARENT_GUID sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TIME_RULE_ID sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-IS_RES_FIXED sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-IS_DATE_FIXED sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_TO_BEGIN sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_TO_END sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_TO_DURATION sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_TO_DUR_UNIT sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_TO_DISTANCE sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_TO_MANU_SET sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_FRM_BEGIN sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_FRM_END sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_FRM_DURATION sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_FRM_DUR_UNIT sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_FRM_DISTANCE sy-vline 
WA_/MRSS/T_API_ASSIGNMENT_UPDATE_STR-TRV_FRM_MANU_SET sy-vline      INTO ld_text SEPARATED BY SPACE.

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