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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/T_REQ_DEM_CAN
*  INTO TABLE @DATA(IT_/MRSS/T_REQ_DEM_CAN2).
*--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_REQ_DEM_CAN INDEX 1 INTO DATA(WA_/MRSS/T_REQ_DEM_CAN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/T_REQ_DEM_CAN>-REQ_GUID = 1.
</MRSS/T_REQ_DEM_CAN>-CANDIDATES = 1.
</MRSS/T_REQ_DEM_CAN>-GUID = 1.
</MRSS/T_REQ_DEM_CAN>-CANDIDATE = 1.
</MRSS/T_REQ_DEM_CAN>-RESOURCE_GUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/T_REQ_DEM_CAN-BPID, sy-vline,
  WA_/MRSS/T_REQ_DEM_CAN-SEQNR, sy-vline,
  WA_/MRSS/T_REQ_DEM_CAN-PARTNER_TYPE, sy-vline,
  WA_/MRSS/T_REQ_DEM_CAN-DEMAND_GUID, sy-vline,
  WA_/MRSS/T_REQ_DEM_CAN-PROPOSED_START, sy-vline,
  WA_/MRSS/T_REQ_DEM_CAN-PROPOSED_END, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/T_REQ_DEM_CAN 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_REQ_DEM_CAN 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_REQ_DEM_CAN INTO WA_/MRSS/T_REQ_DEM_CAN.


*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 UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_REQ_DEM_CAN-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_REQ_DEM_CAN-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_REQ_DEM_CAN_STR, 
REQ_GUID TYPE STRING,
CANDIDATES TYPE STRING,
GUID TYPE STRING,
CANDIDATE TYPE STRING,
RESOURCE_GUID TYPE STRING,
BPID TYPE STRING,
SEQNR TYPE STRING,
PARTNER_TYPE TYPE STRING,
DEMAND_GUID TYPE STRING,
PROPOSED_START TYPE STRING,
PROPOSED_END TYPE STRING,
PROP_DURATION TYPE STRING,
CURR TYPE STRING,
COST_RATE TYPE STRING,
UNIT TYPE STRING,
ABSTRACT_STATUS TYPE STRING,
LOCATION TYPE STRING,
STATUS_OBJNR TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_AT TYPE STRING,
CHANGED_BY TYPE STRING,
CHANGED_AT TYPE STRING,
VERSION_NO TYPE STRING,
OPERATION TYPE STRING,
STATUS TYPE STRING,
OBJNR TYPE STRING,
STATUS_OBJ TYPE STRING,
STATUS_JEST TYPE STRING,
STATUS_JCDS TYPE STRING,
STATUS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/T_REQ_DEM_CAN_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_REQ_DEM_CAN_STR-REQ_GUID sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-CANDIDATES sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-GUID sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-CANDIDATE sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-RESOURCE_GUID sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-BPID sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-SEQNR sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-PARTNER_TYPE sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-DEMAND_GUID sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-PROPOSED_START sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-PROPOSED_END sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-PROP_DURATION sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-CURR sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-COST_RATE sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-UNIT sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-ABSTRACT_STATUS sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-LOCATION sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-STATUS_OBJNR sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-CREATED_BY sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-CREATED_AT sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-CHANGED_BY sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-CHANGED_AT sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-VERSION_NO sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-OPERATION sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-STATUS sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-OBJNR sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-STATUS_OBJ sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-STATUS_JEST sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-STATUS_JCDS sy-vline 
WA_/MRSS/T_REQ_DEM_CAN_STR-STATUS sy-vline      INTO ld_text SEPARATED BY SPACE.

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