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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/T_POT_RESOURCE_NODE
*  INTO TABLE @DATA(IT_/MRSS/T_POT_RESOURCE_NODE2).
*--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_POT_RESOURCE_NODE INDEX 1 INTO DATA(WA_/MRSS/T_POT_RESOURCE_NODE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/T_POT_RESOURCE_NODE>-RESOURCE_KEY = 1.
</MRSS/T_POT_RESOURCE_NODE>-RESOURCE_ID = 1.
</MRSS/T_POT_RESOURCE_NODE>-RESOURCE_PLANNING_NODE = 1.
</MRSS/T_POT_RESOURCE_NODE>-PLVAR = 1.
</MRSS/T_POT_RESOURCE_NODE>-OTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/T_POT_RESOURCE_NODE-OBJID, sy-vline,
  WA_/MRSS/T_POT_RESOURCE_NODE-BEGDA, sy-vline,
  WA_/MRSS/T_POT_RESOURCE_NODE-ENDDA, sy-vline,
  WA_/MRSS/T_POT_RESOURCE_NODE-ISTAT, sy-vline,
  WA_/MRSS/T_POT_RESOURCE_NODE-HISTO, sy-vline,
  WA_/MRSS/T_POT_RESOURCE_NODE-SHORT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/T_POT_RESOURCE_NODE 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_POT_RESOURCE_NODE 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_POT_RESOURCE_NODE INTO WA_/MRSS/T_POT_RESOURCE_NODE.


*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 CAPA_POTENTIAL_UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/T_POT_RESOURCE_NODE-CAPA_POTENTIAL_UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/T_POT_RESOURCE_NODE-CAPA_POTENTIAL_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_POT_RESOURCE_NODE_STR, 
RESOURCE_KEY TYPE STRING,
RESOURCE_ID TYPE STRING,
RESOURCE_PLANNING_NODE TYPE STRING,
PLVAR TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
ISTAT TYPE STRING,
HISTO TYPE STRING,
SHORT TYPE STRING,
STEXT TYPE STRING,
REALO TYPE STRING,
RESOURCE_PLANNING_NODE_BEG TYPE STRING,
RESOURCE_PLANNING_NODE_END TYPE STRING,
CAPA_POTENTIAL_BEG TYPE STRING,
CAPA_POTENTIAL_END TYPE STRING,
CAPA_POTENTIAL TYPE STRING,
CAPA_POTENTIAL_UNIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/T_POT_RESOURCE_NODE_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_POT_RESOURCE_NODE_STR-RESOURCE_KEY sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-RESOURCE_ID sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-RESOURCE_PLANNING_NODE sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-PLVAR sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-OTYPE sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-OBJID sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-BEGDA sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-ENDDA sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-ISTAT sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-HISTO sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-SHORT sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-STEXT sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-REALO sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-RESOURCE_PLANNING_NODE_BEG sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-RESOURCE_PLANNING_NODE_END sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-CAPA_POTENTIAL_BEG sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-CAPA_POTENTIAL_END sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-CAPA_POTENTIAL sy-vline 
WA_/MRSS/T_POT_RESOURCE_NODE_STR-CAPA_POTENTIAL_UNIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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