ABAP Select data from SAP table WCACN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCACN
*  INTO TABLE @DATA(IT_WCACN2).
*--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_WCACN INDEX 1 INTO DATA(WA_WCACN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCACN>-MANDT = 1.
<WCACN>-PRTTYP = 1.
<WCACN>-IWERK = 1.
<WCACN>-CCOBJ = 1.
<WCACN>-CCTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCACN-TGGRP, sy-vline,
  WA_WCACN-ACTPROC, sy-vline,
  WA_WCACN-ACTTYP, sy-vline,
  WA_WCACN-OBJNR, sy-vline,
  WA_WCACN-MULTIFLG, sy-vline,
  WA_WCACN-MULTIGRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCACN 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_WCACN 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_WCACN INTO WA_WCACN.


*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 WCNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WCACN-WCNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCACN-WCNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PRTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WCACN-PRTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCACN-PRTNR.
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_WCACN_STR, 
MANDT TYPE STRING,
PRTTYP TYPE STRING,
IWERK TYPE STRING,
CCOBJ TYPE STRING,
CCTYP TYPE STRING,
TGGRP TYPE STRING,
ACTPROC TYPE STRING,
ACTTYP TYPE STRING,
OBJNR TYPE STRING,
MULTIFLG TYPE STRING,
MULTIGRP TYPE STRING,
WCNR TYPE STRING,
SEQ TYPE STRING,
PRTFORM TYPE STRING,
PRTNR TYPE STRING,
FIRSTFLG TYPE STRING,
LASTFLG TYPE STRING,
REFOBJ TYPE STRING,
CRNAME TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCACN_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_WCACN_STR-MANDT sy-vline 
WA_WCACN_STR-PRTTYP sy-vline 
WA_WCACN_STR-IWERK sy-vline 
WA_WCACN_STR-CCOBJ sy-vline 
WA_WCACN_STR-CCTYP sy-vline 
WA_WCACN_STR-TGGRP sy-vline 
WA_WCACN_STR-ACTPROC sy-vline 
WA_WCACN_STR-ACTTYP sy-vline 
WA_WCACN_STR-OBJNR sy-vline 
WA_WCACN_STR-MULTIFLG sy-vline 
WA_WCACN_STR-MULTIGRP sy-vline 
WA_WCACN_STR-WCNR sy-vline 
WA_WCACN_STR-SEQ sy-vline 
WA_WCACN_STR-PRTFORM sy-vline 
WA_WCACN_STR-PRTNR sy-vline 
WA_WCACN_STR-FIRSTFLG sy-vline 
WA_WCACN_STR-LASTFLG sy-vline 
WA_WCACN_STR-REFOBJ sy-vline 
WA_WCACN_STR-CRNAME sy-vline 
WA_WCACN_STR-CRDATE sy-vline 
WA_WCACN_STR-CRTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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