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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/T_OPT_GEN_DEM
*  INTO TABLE @DATA(IT_/MRSS/T_OPT_GEN_DEM2).
*--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_OPT_GEN_DEM INDEX 1 INTO DATA(WA_/MRSS/T_OPT_GEN_DEM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/T_OPT_GEN_DEM>-ID = 1.
</MRSS/T_OPT_GEN_DEM>-EXT_ID_TEXT = 1.
</MRSS/T_OPT_GEN_DEM>-DEMAND_ID = 1.
</MRSS/T_OPT_GEN_DEM>-DEMAND_HEADER_ID = 1.
</MRSS/T_OPT_GEN_DEM>-RESOURCE_ID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/T_OPT_GEN_DEM-IS_ASSIGNMENT, sy-vline,
  WA_/MRSS/T_OPT_GEN_DEM-IS_TEAM_PLANNING_RELEVANT, sy-vline,
  WA_/MRSS/T_OPT_GEN_DEM-FORCE_TEAM_MEMBER_PLANNING, sy-vline,
  WA_/MRSS/T_OPT_GEN_DEM-IS_SINGLE_RESOURCE_REQUIRED, sy-vline,
  WA_/MRSS/T_OPT_GEN_DEM-IS_VIRTUAL_DEMAND, sy-vline,
  WA_/MRSS/T_OPT_GEN_DEM-IS_SUB_DEMAND_OF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/T_OPT_GEN_DEM 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_OPT_GEN_DEM 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_OPT_GEN_DEM INTO WA_/MRSS/T_OPT_GEN_DEM.


*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 RESOURCES_NEEDED
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_OPT_GEN_DEM-RESOURCES_NEEDED
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_OPT_GEN_DEM-RESOURCES_NEEDED.
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_OPT_GEN_DEM_STR, 
ID TYPE STRING,
EXT_ID_TEXT TYPE STRING,
DEMAND_ID TYPE STRING,
DEMAND_HEADER_ID TYPE STRING,
RESOURCE_ID TYPE STRING,
IS_ASSIGNMENT TYPE STRING,
IS_TEAM_PLANNING_RELEVANT TYPE STRING,
FORCE_TEAM_MEMBER_PLANNING TYPE STRING,
IS_SINGLE_RESOURCE_REQUIRED TYPE STRING,
IS_VIRTUAL_DEMAND TYPE STRING,
IS_SUB_DEMAND_OF TYPE STRING,
VAL_FROM TYPE STRING,
VAL_TO TYPE STRING,
PLAN_FROM TYPE STRING,
PLAN_TO TYPE STRING,
EARL_START TYPE STRING,
LAT_START TYPE STRING,
EARL_END TYPE STRING,
LAT_END TYPE STRING,
SCHED_FROM TYPE STRING,
SCHED_TO TYPE STRING,
SLA_FROM TYPE STRING,
SLA_TO TYPE STRING,
DURATION TYPE STRING,
LOCATION TYPE STRING,
NOT_DELIVER_FNC TYPE STRING,
NOT_DELIVER_COST TYPE STRING,
NOT_DELIVER_NUM TYPE STRING,
NOT_DELIVER_GRACE TYPE STRING,
PRIORITY_FACTOR TYPE STRING,
PF_CALC_REFERENC TYPE STRING,
PF_LATE_SERVICE TYPE STRING,
PF_EARLY_SERVICE TYPE STRING,
RESOURCES TYPE STRING,
RESOURCES_NEEDED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/T_OPT_GEN_DEM_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_OPT_GEN_DEM_STR-ID sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-EXT_ID_TEXT sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-DEMAND_ID sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-DEMAND_HEADER_ID sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-RESOURCE_ID sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-IS_ASSIGNMENT sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-IS_TEAM_PLANNING_RELEVANT sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-FORCE_TEAM_MEMBER_PLANNING sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-IS_SINGLE_RESOURCE_REQUIRED sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-IS_VIRTUAL_DEMAND sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-IS_SUB_DEMAND_OF sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-VAL_FROM sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-VAL_TO sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-PLAN_FROM sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-PLAN_TO sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-EARL_START sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-LAT_START sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-EARL_END sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-LAT_END sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-SCHED_FROM sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-SCHED_TO sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-SLA_FROM sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-SLA_TO sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-DURATION sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-LOCATION sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-NOT_DELIVER_FNC sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-NOT_DELIVER_COST sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-NOT_DELIVER_NUM sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-NOT_DELIVER_GRACE sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-PRIORITY_FACTOR sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-PF_CALC_REFERENC sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-PF_LATE_SERVICE sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-PF_EARLY_SERVICE sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-RESOURCES sy-vline 
WA_/MRSS/T_OPT_GEN_DEM_STR-RESOURCES_NEEDED sy-vline      INTO ld_text SEPARATED BY SPACE.

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