ABAP Select data from SAP table CWRKLOADREDIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CWRKLOADREDIST
*  INTO TABLE @DATA(IT_CWRKLOADREDIST2).
*--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_CWRKLOADREDIST INDEX 1 INTO DATA(WA_CWRKLOADREDIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CWRKLOADREDIST>-MANDT = 1.
<CWRKLOADREDIST>-PURCHASINGDOCUMENT = 1.
<CWRKLOADREDIST>-PURCHASINGDOCUMENTITEM = 1.
<CWRKLOADREDIST>-PURCHASINGDOCUMENTTYPE = 1.
<CWRKLOADREDIST>-PURCHASINGDOCUMENTTYPENAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CWRKLOADREDIST-STATUS, sy-vline,
  WA_CWRKLOADREDIST-PURCHASINGGROUP, sy-vline,
  WA_CWRKLOADREDIST-PURCHASINGGROUPNAME, sy-vline,
  WA_CWRKLOADREDIST-PURCHASINGORGANIZATION, sy-vline,
  WA_CWRKLOADREDIST-PURCHASINGDOCUMENTCATEGORY, sy-vline,
  WA_CWRKLOADREDIST-PURCHASINGORGANIZATIONNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CWRKLOADREDIST 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_CWRKLOADREDIST 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_CWRKLOADREDIST INTO WA_CWRKLOADREDIST.


*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 PURCHASINGDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CWRKLOADREDIST-PURCHASINGDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CWRKLOADREDIST-PURCHASINGDOCUMENT.
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_CWRKLOADREDIST_STR, 
MANDT TYPE STRING,
PURCHASINGDOCUMENT TYPE STRING,
PURCHASINGDOCUMENTITEM TYPE STRING,
PURCHASINGDOCUMENTTYPE TYPE STRING,
PURCHASINGDOCUMENTTYPENAME TYPE STRING,
STATUS TYPE STRING,
PURCHASINGGROUP TYPE STRING,
PURCHASINGGROUPNAME TYPE STRING,
PURCHASINGORGANIZATION TYPE STRING,
PURCHASINGDOCUMENTCATEGORY TYPE STRING,
PURCHASINGORGANIZATIONNAME TYPE STRING,
CREATIONDATE TYPE STRING,
PURCHASINGDOCUMENTCATEGORYNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CWRKLOADREDIST_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_CWRKLOADREDIST_STR-MANDT sy-vline 
WA_CWRKLOADREDIST_STR-PURCHASINGDOCUMENT sy-vline 
WA_CWRKLOADREDIST_STR-PURCHASINGDOCUMENTITEM sy-vline 
WA_CWRKLOADREDIST_STR-PURCHASINGDOCUMENTTYPE sy-vline 
WA_CWRKLOADREDIST_STR-PURCHASINGDOCUMENTTYPENAME sy-vline 
WA_CWRKLOADREDIST_STR-STATUS sy-vline 
WA_CWRKLOADREDIST_STR-PURCHASINGGROUP sy-vline 
WA_CWRKLOADREDIST_STR-PURCHASINGGROUPNAME sy-vline 
WA_CWRKLOADREDIST_STR-PURCHASINGORGANIZATION sy-vline 
WA_CWRKLOADREDIST_STR-PURCHASINGDOCUMENTCATEGORY sy-vline 
WA_CWRKLOADREDIST_STR-PURCHASINGORGANIZATIONNAME sy-vline 
WA_CWRKLOADREDIST_STR-CREATIONDATE sy-vline 
WA_CWRKLOADREDIST_STR-PURCHASINGDOCUMENTCATEGORYNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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