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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/T_RESOURCE_DATA
*  INTO TABLE @DATA(IT_/MRSS/T_RESOURCE_DATA2).
*--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_RESOURCE_DATA INDEX 1 INTO DATA(WA_/MRSS/T_RESOURCE_DATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/T_RESOURCE_DATA>-ID = 1.
</MRSS/T_RESOURCE_DATA>-TEXT = 1.
</MRSS/T_RESOURCE_DATA>-TYPE = 1.
</MRSS/T_RESOURCE_DATA>-REL = 1.
</MRSS/T_RESOURCE_DATA>-EDIT_MODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/T_RESOURCE_DATA-PERNR, sy-vline,
  WA_/MRSS/T_RESOURCE_DATA-BEGDA, sy-vline,
  WA_/MRSS/T_RESOURCE_DATA-BEG_UZEIT, sy-vline,
  WA_/MRSS/T_RESOURCE_DATA-ENDDA, sy-vline,
  WA_/MRSS/T_RESOURCE_DATA-END_UZEIT, sy-vline,
  WA_/MRSS/T_RESOURCE_DATA-TIMESPEC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/T_RESOURCE_DATA 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_RESOURCE_DATA 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_RESOURCE_DATA INTO WA_/MRSS/T_RESOURCE_DATA.


*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.
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_RESOURCE_DATA_STR, 
ID TYPE STRING,
TEXT TYPE STRING,
TYPE TYPE STRING,
REL TYPE STRING,
EDIT_MODE TYPE STRING,
PERNR TYPE STRING,
BEGDA TYPE STRING,
BEG_UZEIT TYPE STRING,
ENDDA TYPE STRING,
END_UZEIT TYPE STRING,
TIMESPEC TYPE STRING,
ASSIGNMENT TYPE STRING,
BASIC_AVAIL TYPE STRING,
BASIC_NON_AVAIL TYPE STRING,
NOT_VALID TYPE STRING,
COLLISION TYPE STRING,
ORG_UNIT 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,
AVAIL_RELATIVE TYPE STRING,
AVAIL_ABSOLUTE TYPE STRING,
UTIL_RELATIVE TYPE STRING,
BASIC_AVAIL_COMPLEX TYPE STRING,
BASIC_NONE_AVAIL_COMPLEX TYPE STRING,
STATUS TYPE STRING,
STATUS TYPE STRING,
STEXT TYPE STRING,
LTEXT TYPE STRING,
CHANGED_AT TYPE STRING,
STATUS_CHG TYPE STRING,
UNIQUE_SEQUENCE TYPE STRING,
SOURCE_TYPE TYPE STRING,
CAPACITY_INFO TYPE STRING,
AGR_CAPA_INFO TYPE STRING,
CAPACITY_LIMIT TYPE STRING,
OVERBOOK_LIMIT TYPE STRING,
CONSUMED_CAP TYPE STRING,
XDUMMY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/T_RESOURCE_DATA_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_RESOURCE_DATA_STR-ID sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-TEXT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-TYPE sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-REL sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-EDIT_MODE sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-PERNR sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-BEGDA sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-BEG_UZEIT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-ENDDA sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-END_UZEIT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-TIMESPEC sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-ASSIGNMENT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-BASIC_AVAIL sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-BASIC_NON_AVAIL sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-NOT_VALID sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-COLLISION sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-ORG_UNIT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-PLVAR sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-OTYPE sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-OBJID sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-BEGDA sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-ENDDA sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-ISTAT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-HISTO sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-SHORT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-STEXT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-REALO sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-AVAIL_RELATIVE sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-AVAIL_ABSOLUTE sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-UTIL_RELATIVE sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-BASIC_AVAIL_COMPLEX sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-BASIC_NONE_AVAIL_COMPLEX sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-STATUS sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-STATUS sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-STEXT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-LTEXT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-CHANGED_AT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-STATUS_CHG sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-UNIQUE_SEQUENCE sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-SOURCE_TYPE sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-CAPACITY_INFO sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-AGR_CAPA_INFO sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-CAPACITY_LIMIT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-OVERBOOK_LIMIT sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-CONSUMED_CAP sy-vline 
WA_/MRSS/T_RESOURCE_DATA_STR-XDUMMY sy-vline      INTO ld_text SEPARATED BY SPACE.

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