ABAP Select data from SAP table WCAD into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCAD
*  INTO TABLE @DATA(IT_WCAD2).
*--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_WCAD INDEX 1 INTO DATA(WA_WCAD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCAD>-MANDT = 1.
<WCAD>-AUFPL = 1.
<WCAD>-APRVGRP = 1.
<WCAD>-IWERK = 1.
<WCAD>-OBJART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCAD-OBJTYP, sy-vline,
  WA_WCAD-PMSOG, sy-vline,
  WA_WCAD-SIGN, sy-vline,
  WA_WCAD-VAL, sy-vline,
  WA_WCAD-CRNAME, sy-vline,
  WA_WCAD-CRDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCAD 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_WCAD 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_WCAD INTO WA_WCAD.


*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 NUMCV, internal->external for field APRVGRP
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_WCAD-APRVGRP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCAD-APRVGRP.
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_WCAD_STR, 
MANDT TYPE STRING,
AUFPL TYPE STRING,
APRVGRP TYPE STRING,
IWERK TYPE STRING,
OBJART TYPE STRING,
OBJTYP TYPE STRING,
PMSOG TYPE STRING,
SIGN TYPE STRING,
VAL TYPE STRING,
CRNAME TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCAD_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_WCAD_STR-MANDT sy-vline 
WA_WCAD_STR-AUFPL sy-vline 
WA_WCAD_STR-APRVGRP sy-vline 
WA_WCAD_STR-IWERK sy-vline 
WA_WCAD_STR-OBJART sy-vline 
WA_WCAD_STR-OBJTYP sy-vline 
WA_WCAD_STR-PMSOG sy-vline 
WA_WCAD_STR-SIGN sy-vline 
WA_WCAD_STR-VAL sy-vline 
WA_WCAD_STR-CRNAME sy-vline 
WA_WCAD_STR-CRDATE sy-vline 
WA_WCAD_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.