ABAP Select data from SAP table IWRKCTRCAP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP IWRKCTRCAP 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 IWRKCTRCAP. 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 IWRKCTRCAP 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_IWRKCTRCAP TYPE STANDARD TABLE OF IWRKCTRCAP,
      WA_IWRKCTRCAP TYPE IWRKCTRCAP,
      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: <IWRKCTRCAP> TYPE IWRKCTRCAP.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM IWRKCTRCAP
  INTO TABLE IT_IWRKCTRCAP.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IWRKCTRCAP
*  INTO TABLE @DATA(IT_IWRKCTRCAP2).
*--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_IWRKCTRCAP INDEX 1 INTO DATA(WA_IWRKCTRCAP2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_IWRKCTRCAP ASSIGNING <IWRKCTRCAP>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IWRKCTRCAP>-MANDT = 1.
<IWRKCTRCAP>-WORKCENTERINTERNALID = 1.
<IWRKCTRCAP>-WORKCENTERTYPECODE = 1.
<IWRKCTRCAP>-CAPACITYCATEGORYALLOCATION = 1.
<IWRKCTRCAP>-CAPACITYINTERNALID = 1.

ENDLOOP.

LOOP AT IT_IWRKCTRCAP INTO WA_IWRKCTRCAP.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IWRKCTRCAP-LASTCHANGEDATE, sy-vline,
  WA_IWRKCTRCAP-LASTCHANGEDBYUSER, sy-vline,
  WA_IWRKCTRCAP-WORKCENTER, sy-vline,
  WA_IWRKCTRCAP-OBJECTDESCRIPTION, sy-vline,
  WA_IWRKCTRCAP-WORKCENTERCATEGORYCODE, sy-vline,
  WA_IWRKCTRCAP-SETUPCAPREQUIREMENTFORMULA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IWRKCTRCAP 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_IWRKCTRCAP 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_IWRKCTRCAP INTO WA_IWRKCTRCAP.


*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 CAPACITYQUANTITYUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_IWRKCTRCAP-CAPACITYQUANTITYUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IWRKCTRCAP-CAPACITYQUANTITYUNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field CAPACITYBASEQTYUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_IWRKCTRCAP-CAPACITYBASEQTYUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_IWRKCTRCAP-CAPACITYBASEQTYUNIT.
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_IWRKCTRCAP_STR, 
MANDT TYPE STRING,
WORKCENTERINTERNALID TYPE STRING,
WORKCENTERTYPECODE TYPE STRING,
CAPACITYCATEGORYALLOCATION TYPE STRING,
CAPACITYINTERNALID TYPE STRING,
LASTCHANGEDATE TYPE STRING,
LASTCHANGEDBYUSER TYPE STRING,
WORKCENTER TYPE STRING,
OBJECTDESCRIPTION TYPE STRING,
WORKCENTERCATEGORYCODE TYPE STRING,
SETUPCAPREQUIREMENTFORMULA TYPE STRING,
PROCGCAPREQUIREMENTFORMULA TYPE STRING,
TEARDOWNCAPREQUIREMENTFORMULA TYPE STRING,
OTHERCAPREQUIREMENTFORMULA TYPE STRING,
VALIDITYSTARTDATE TYPE STRING,
VALIDITYENDDATE TYPE STRING,
WORKCENTERLASTCHANGEDATETIME TYPE STRING,
CAPACITY TYPE STRING,
CAPACITYCATEGORYCODE TYPE STRING,
CAPACITYACTIVEVERSION TYPE STRING,
CAPACITYISFINITE TYPE STRING,
CAPACITYISPOOLED TYPE STRING,
CAPACITYHASINDIVCAPACITIES TYPE STRING,
CAPACITYISEXCLDFRMLONGTERMPLNG TYPE STRING,
CAPACITYNUMBEROFCAPACITIES TYPE STRING,
CAPACITYRESPONSIBLEPLANNER TYPE STRING,
CAPACITYPLANUTILIZATIONPERCENT TYPE STRING,
CAPACITYBREAKDURATION TYPE STRING,
PLANT TYPE STRING,
FACTORYCALENDAR TYPE STRING,
AUTHORIZATIONGROUP TYPE STRING,
SHIFTGROUP TYPE STRING,
CAPACITYSTARTTIMEID TYPE STRING,
CAPACITYENDTIMEID TYPE STRING,
CAPISUSEDINMULTIOPERATIONS TYPE STRING,
REFERENCEDCAPACITYINTERNALID TYPE STRING,
CAPOVERLOADTHRESHOLDINPERCENT TYPE STRING,
CAPACITYQUANTITYUNIT TYPE STRING,
CAPACITYBASEQTYUNIT TYPE STRING,
CAPACITYTEXT TYPE STRING,
CAPACITYLASTCHANGEDATETIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IWRKCTRCAP_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_IWRKCTRCAP_STR-MANDT sy-vline 
WA_IWRKCTRCAP_STR-WORKCENTERINTERNALID sy-vline 
WA_IWRKCTRCAP_STR-WORKCENTERTYPECODE sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYCATEGORYALLOCATION sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYINTERNALID sy-vline 
WA_IWRKCTRCAP_STR-LASTCHANGEDATE sy-vline 
WA_IWRKCTRCAP_STR-LASTCHANGEDBYUSER sy-vline 
WA_IWRKCTRCAP_STR-WORKCENTER sy-vline 
WA_IWRKCTRCAP_STR-OBJECTDESCRIPTION sy-vline 
WA_IWRKCTRCAP_STR-WORKCENTERCATEGORYCODE sy-vline 
WA_IWRKCTRCAP_STR-SETUPCAPREQUIREMENTFORMULA sy-vline 
WA_IWRKCTRCAP_STR-PROCGCAPREQUIREMENTFORMULA sy-vline 
WA_IWRKCTRCAP_STR-TEARDOWNCAPREQUIREMENTFORMULA sy-vline 
WA_IWRKCTRCAP_STR-OTHERCAPREQUIREMENTFORMULA sy-vline 
WA_IWRKCTRCAP_STR-VALIDITYSTARTDATE sy-vline 
WA_IWRKCTRCAP_STR-VALIDITYENDDATE sy-vline 
WA_IWRKCTRCAP_STR-WORKCENTERLASTCHANGEDATETIME sy-vline 
WA_IWRKCTRCAP_STR-CAPACITY sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYCATEGORYCODE sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYACTIVEVERSION sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYISFINITE sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYISPOOLED sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYHASINDIVCAPACITIES sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYISEXCLDFRMLONGTERMPLNG sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYNUMBEROFCAPACITIES sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYRESPONSIBLEPLANNER sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYPLANUTILIZATIONPERCENT sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYBREAKDURATION sy-vline 
WA_IWRKCTRCAP_STR-PLANT sy-vline 
WA_IWRKCTRCAP_STR-FACTORYCALENDAR sy-vline 
WA_IWRKCTRCAP_STR-AUTHORIZATIONGROUP sy-vline 
WA_IWRKCTRCAP_STR-SHIFTGROUP sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYSTARTTIMEID sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYENDTIMEID sy-vline 
WA_IWRKCTRCAP_STR-CAPISUSEDINMULTIOPERATIONS sy-vline 
WA_IWRKCTRCAP_STR-REFERENCEDCAPACITYINTERNALID sy-vline 
WA_IWRKCTRCAP_STR-CAPOVERLOADTHRESHOLDINPERCENT sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYQUANTITYUNIT sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYBASEQTYUNIT sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYTEXT sy-vline 
WA_IWRKCTRCAP_STR-CAPACITYLASTCHANGEDATETIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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