ABAP Select data from SAP table WCAMF 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 WCAMF 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 WCAMF. 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 WCAMF 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_WCAMF TYPE STANDARD TABLE OF WCAMF,
      WA_WCAMF TYPE WCAMF,
      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: <WCAMF> TYPE WCAMF.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCAMF
*  INTO TABLE @DATA(IT_WCAMF2).
*--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_WCAMF INDEX 1 INTO DATA(WA_WCAMF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCAMF>-MANDT = 1.
<WCAMF>-WAPINR = 1.
<WCAMF>-WKPTID = 1.
<WCAMF>-CRNAME = 1.
<WCAMF>-CRDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCAMF-CRTIME, sy-vline,
  WA_WCAMF-CHNAME, sy-vline,
  WA_WCAMF-CHDATE, sy-vline,
  WA_WCAMF-CHTIME, sy-vline,
  WA_WCAMF-COMPLETED, sy-vline,
  WA_WCAMF-STATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCAMF 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_WCAMF 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_WCAMF INTO WA_WCAMF.


*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 WAPINR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WCAMF-WAPINR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCAMF-WAPINR.
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_WCAMF_STR, 
MANDT TYPE STRING,
WAPINR TYPE STRING,
WKPTID TYPE STRING,
CRNAME TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,
CHNAME TYPE STRING,
CHDATE TYPE STRING,
CHTIME TYPE STRING,
COMPLETED TYPE STRING,
STATUS TYPE STRING,
STEP TYPE STRING,
FEEDBACK TYPE STRING,
CTRLFLG1 TYPE STRING,
CTRLFLG2 TYPE STRING,
CTRLFLG3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCAMF_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_WCAMF_STR-MANDT sy-vline 
WA_WCAMF_STR-WAPINR sy-vline 
WA_WCAMF_STR-WKPTID sy-vline 
WA_WCAMF_STR-CRNAME sy-vline 
WA_WCAMF_STR-CRDATE sy-vline 
WA_WCAMF_STR-CRTIME sy-vline 
WA_WCAMF_STR-CHNAME sy-vline 
WA_WCAMF_STR-CHDATE sy-vline 
WA_WCAMF_STR-CHTIME sy-vline 
WA_WCAMF_STR-COMPLETED sy-vline 
WA_WCAMF_STR-STATUS sy-vline 
WA_WCAMF_STR-STEP sy-vline 
WA_WCAMF_STR-FEEDBACK sy-vline 
WA_WCAMF_STR-CTRLFLG1 sy-vline 
WA_WCAMF_STR-CTRLFLG2 sy-vline 
WA_WCAMF_STR-CTRLFLG3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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