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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/T_SGE_DEMAND_DETAILS
*  INTO TABLE @DATA(IT_/MRSS/T_SGE_DEMAND_DETAILS2).
*--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_SGE_DEMAND_DETAILS INDEX 1 INTO DATA(WA_/MRSS/T_SGE_DEMAND_DETAILS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/T_SGE_DEMAND_DETAILS>-ID_H = 1.
</MRSS/T_SGE_DEMAND_DETAILS>-HEADER = 1.
</MRSS/T_SGE_DEMAND_DETAILS>-GUID = 1.
</MRSS/T_SGE_DEMAND_DETAILS>-ID = 1.
</MRSS/T_SGE_DEMAND_DETAILS>-DESCRIPTION = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/T_SGE_DEMAND_DETAILS-OBJID, sy-vline,
  WA_/MRSS/T_SGE_DEMAND_DETAILS-PLAN_FROM, sy-vline,
  WA_/MRSS/T_SGE_DEMAND_DETAILS-PLAN_TO, sy-vline,
  WA_/MRSS/T_SGE_DEMAND_DETAILS-DURATION, sy-vline,
  WA_/MRSS/T_SGE_DEMAND_DETAILS-DURATION_UNIT, sy-vline,
  WA_/MRSS/T_SGE_DEMAND_DETAILS-TOTAL_WORK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/T_SGE_DEMAND_DETAILS 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_SGE_DEMAND_DETAILS 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_SGE_DEMAND_DETAILS INTO WA_/MRSS/T_SGE_DEMAND_DETAILS.


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

*Conversion exit CUNIT, internal->external for field TOTAL_WORK_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_SGE_DEMAND_DETAILS-TOTAL_WORK_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_SGE_DEMAND_DETAILS-TOTAL_WORK_UNIT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit PFKEY, internal->external for field REQ_PROFILE_ID
CALL FUNCTION 'CONVERSION_EXIT_PFKEY_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_SGE_DEMAND_DETAILS-REQ_PROFILE_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_SGE_DEMAND_DETAILS-REQ_PROFILE_ID.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit CUNIT, internal->external for field REMAIN_DUR_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_SGE_DEMAND_DETAILS-REMAIN_DUR_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_SGE_DEMAND_DETAILS-REMAIN_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_SGE_DEMAND_DETAILS_STR, 
ID_H TYPE STRING,
HEADER TYPE STRING,
GUID TYPE STRING,
ID TYPE STRING,
DESCRIPTION TYPE STRING,
OBJID TYPE STRING,
PLAN_FROM TYPE STRING,
PLAN_TO TYPE STRING,
DURATION TYPE STRING,
DURATION_UNIT TYPE STRING,
TOTAL_WORK TYPE STRING,
TOTAL_WORK_UNIT TYPE STRING,
UTIL TYPE STRING,
MULT_RES TYPE STRING,
REQ_PROFILE_ID TYPE STRING,
PROBABILITY TYPE STRING,
REQUESTER_EMAIL TYPE STRING,
REQUESTER_UNAME TYPE STRING,
REQUESTER_FNAME TYPE STRING,
REQUESTER_TLNUM TYPE STRING,
REMAIN_DUR TYPE STRING,
REMAIN_DUR_UNIT TYPE STRING,
PLAN_STATUS TYPE STRING,
NUM_ASS TYPE STRING,
NUM_RES TYPE STRING,
LOCATION TYPE STRING,
DEM_TYPE TYPE STRING,
FOUND_RESOURCES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/T_SGE_DEMAND_DETAILS_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_SGE_DEMAND_DETAILS_STR-ID_H sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-HEADER sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-GUID sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-ID sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-DESCRIPTION sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-OBJID sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-PLAN_FROM sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-PLAN_TO sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-DURATION sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-DURATION_UNIT sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-TOTAL_WORK sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-TOTAL_WORK_UNIT sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-UTIL sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-MULT_RES sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-REQ_PROFILE_ID sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-PROBABILITY sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-REQUESTER_EMAIL sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-REQUESTER_UNAME sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-REQUESTER_FNAME sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-REQUESTER_TLNUM sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-REMAIN_DUR sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-REMAIN_DUR_UNIT sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-PLAN_STATUS sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-NUM_ASS sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-NUM_RES sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-LOCATION sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-DEM_TYPE sy-vline 
WA_/MRSS/T_SGE_DEMAND_DETAILS_STR-FOUND_RESOURCES sy-vline      INTO ld_text SEPARATED BY SPACE.

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