ABAP Select data from SAP table WCACM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCACM
*  INTO TABLE @DATA(IT_WCACM2).
*--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_WCACM INDEX 1 INTO DATA(WA_WCACM2).


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

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

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCACM-ACTPROC, sy-vline,
  WA_WCACM-ACTTYP, sy-vline,
  WA_WCACM-CROBJ, sy-vline,
  WA_WCACM-CHOBJ, sy-vline,
  WA_WCACM-CRNAME, sy-vline,
  WA_WCACM-CRDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCACM 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_WCACM 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_WCACM INTO WA_WCACM.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_WCACM_STR, 
MANDT TYPE STRING,
IWERK TYPE STRING,
CCOBJ TYPE STRING,
CCTYP TYPE STRING,
TGGRP TYPE STRING,
ACTPROC TYPE STRING,
ACTTYP TYPE STRING,
CROBJ TYPE STRING,
CHOBJ TYPE STRING,
CRNAME TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,
CHNAME TYPE STRING,
CHDATE TYPE STRING,
CHTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCACM_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_WCACM_STR-MANDT sy-vline 
WA_WCACM_STR-IWERK sy-vline 
WA_WCACM_STR-CCOBJ sy-vline 
WA_WCACM_STR-CCTYP sy-vline 
WA_WCACM_STR-TGGRP sy-vline 
WA_WCACM_STR-ACTPROC sy-vline 
WA_WCACM_STR-ACTTYP sy-vline 
WA_WCACM_STR-CROBJ sy-vline 
WA_WCACM_STR-CHOBJ sy-vline 
WA_WCACM_STR-CRNAME sy-vline 
WA_WCACM_STR-CRDATE sy-vline 
WA_WCACM_STR-CRTIME sy-vline 
WA_WCACM_STR-CHNAME sy-vline 
WA_WCACM_STR-CHDATE sy-vline 
WA_WCACM_STR-CHTIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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