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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/T_RMFS_CHILD_ASSIGNMENT
*  INTO TABLE @DATA(IT_/MRSS/T_RMFS_CHILD_ASSIGNMENT2).
*--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_RMFS_CHILD_ASSIGNMENT INDEX 1 INTO DATA(WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/T_RMFS_CHILD_ASSIGNMENT>-ASSIGNMENT_KEY = 1.
</MRSS/T_RMFS_CHILD_ASSIGNMENT>-TIMESPEC_KEY = 1.
</MRSS/T_RMFS_CHILD_ASSIGNMENT>-DEMAND_KEY_EXT = 1.
</MRSS/T_RMFS_CHILD_ASSIGNMENT>-DEMAND_LOGSYS = 1.
</MRSS/T_RMFS_CHILD_ASSIGNMENT>-RESOURCE_KEY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT-PARENT_GUID, sy-vline,
  WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT-TIME_RULE_ID, sy-vline,
  WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT-DURATION, sy-vline,
  WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT-ASSIGNMENT_DESC, sy-vline,
  WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT-ASSIGNMENT_TYPE, sy-vline,
  WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT-DEM_TYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT 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_RMFS_CHILD_ASSIGNMENT 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_RMFS_CHILD_ASSIGNMENT INTO WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT.


*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 DEMAND_LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT-DEMAND_LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT-DEMAND_LOGSYS.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field CUSTOMER_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT-CUSTOMER_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT-CUSTOMER_ID.
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_RMFS_CHILD_ASSIGNMENT_STR, 
ASSIGNMENT_KEY TYPE STRING,
TIMESPEC_KEY TYPE STRING,
DEMAND_KEY_EXT TYPE STRING,
DEMAND_LOGSYS TYPE STRING,
RESOURCE_KEY TYPE STRING,
PARENT_GUID TYPE STRING,
TIME_RULE_ID TYPE STRING,
DURATION TYPE STRING,
ASSIGNMENT_DESC TYPE STRING,
ASSIGNMENT_TYPE TYPE STRING,
DEM_TYPE TYPE STRING,
SOFT_EXP_DATE TYPE STRING,
OPERATION TYPE STRING,
BOOK_TYPE TYPE STRING,
DUR_TYPE TYPE STRING,
REQUEST_NUMBER TYPE STRING,
ROLE_NUMBER TYPE STRING,
VERSION_NO TYPE STRING,
OBJID TYPE STRING,
BEGIN_DATE TYPE STRING,
BEGIN_TIME TYPE STRING,
END_DATE TYPE STRING,
END_TIME TYPE STRING,
PART_CONC TYPE STRING,
COMMENTS TYPE STRING,
DEM_START_DATE TYPE STRING,
DEM_END_DATE TYPE STRING,
REQ_DAYS TYPE STRING,
STAFFED_DAYS TYPE STRING,
REFINED_DAYS TYPE STRING,
ROLE_ASSIGNMENT_TYPE TYPE STRING,
PROJECTNAME TYPE STRING,
DEL_FLAG TYPE STRING,
DELIMIT_FLAG TYPE STRING,
DELIMIT_DATE TYPE STRING,
REQUEST_URL TYPE STRING,
TIMESPEC_TYPE TYPE STRING,
TIMESPEC_DESC TYPE STRING,
PRIORITY TYPE STRING,
TIMESPEC_FLAG TYPE STRING,
ROW_ID TYPE STRING,
PARTNER_ONLY TYPE STRING,
ASSIGN_STARTDATE TYPE STRING,
ASSIGN_ENDDATE TYPE STRING,
EDITED_ROW TYPE STRING,
STATUS TYPE STRING,
STATUS_DESC TYPE STRING,
CUSTOMER_ID TYPE STRING,
CUSTOMER_NAME TYPE STRING,
FOUR_BY_TEN_IND TYPE STRING,
HR_TIMESPEC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_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_RMFS_CHILD_ASSIGNMENT_STR-ASSIGNMENT_KEY sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-TIMESPEC_KEY sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-DEMAND_KEY_EXT sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-DEMAND_LOGSYS sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-RESOURCE_KEY sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-PARENT_GUID sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-TIME_RULE_ID sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-DURATION sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-ASSIGNMENT_DESC sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-ASSIGNMENT_TYPE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-DEM_TYPE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-SOFT_EXP_DATE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-OPERATION sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-BOOK_TYPE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-DUR_TYPE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-REQUEST_NUMBER sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-ROLE_NUMBER sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-VERSION_NO sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-OBJID sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-BEGIN_DATE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-BEGIN_TIME sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-END_DATE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-END_TIME sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-PART_CONC sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-COMMENTS sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-DEM_START_DATE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-DEM_END_DATE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-REQ_DAYS sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-STAFFED_DAYS sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-REFINED_DAYS sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-ROLE_ASSIGNMENT_TYPE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-PROJECTNAME sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-DEL_FLAG sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-DELIMIT_FLAG sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-DELIMIT_DATE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-REQUEST_URL sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-TIMESPEC_TYPE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-TIMESPEC_DESC sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-PRIORITY sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-TIMESPEC_FLAG sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-ROW_ID sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-PARTNER_ONLY sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-ASSIGN_STARTDATE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-ASSIGN_ENDDATE sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-EDITED_ROW sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-STATUS sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-STATUS_DESC sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-CUSTOMER_ID sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-CUSTOMER_NAME sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-FOUR_BY_TEN_IND sy-vline 
WA_/MRSS/T_RMFS_CHILD_ASSIGNMENT_STR-HR_TIMESPEC sy-vline      INTO ld_text SEPARATED BY SPACE.

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