ABAP Select data from SAP table WCAMI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCAMI
*  INTO TABLE @DATA(IT_WCAMI2).
*--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_WCAMI INDEX 1 INTO DATA(WA_WCAMI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCAMI>-MANDT = 1.
<WCAMI>-WCNR = 1.
<WCAMI>-LSTID = 1.
<WCAMI>-WCITM = 1.
<WCAMI>-OBJNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCAMI-ITMTYP, sy-vline,
  WA_WCAMI-SEQ, sy-vline,
  WA_WCAMI-PRED, sy-vline,
  WA_WCAMI-SUCC, sy-vline,
  WA_WCAMI-CCOBJ, sy-vline,
  WA_WCAMI-CCTYP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCAMI 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_WCAMI 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_WCAMI INTO WA_WCAMI.


*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_WCAMI-WCNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCAMI-WCNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field TGNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WCAMI-TGNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCAMI-TGNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field UNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WCAMI-UNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCAMI-UNNR.
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_WCAMI_STR, 
MANDT TYPE STRING,
WCNR TYPE STRING,
LSTID TYPE STRING,
WCITM TYPE STRING,
OBJNR TYPE STRING,
ITMTYP TYPE STRING,
SEQ TYPE STRING,
PRED TYPE STRING,
SUCC TYPE STRING,
CCOBJ TYPE STRING,
CCTYP TYPE STRING,
CCOBJNR TYPE STRING,
STXT TYPE STRING,
TGGRP TYPE STRING,
TGSTEP TYPE STRING,
TGPROC TYPE STRING,
TGTYP TYPE STRING,
TGSEQ TYPE STRING,
TGTXT TYPE STRING,
UNSTEP TYPE STRING,
UNPROC TYPE STRING,
UNTYP TYPE STRING,
UNSEQ TYPE STRING,
UNTXT TYPE STRING,
PHBLFLG TYPE STRING,
PHBLTYP TYPE STRING,
PHBLNR TYPE STRING,
TGFLG TYPE STRING,
TGFORM TYPE STRING,
TGNR TYPE STRING,
UNFORM TYPE STRING,
UNNR TYPE STRING,
CONTROL TYPE STRING,
LOCATION TYPE STRING,
LFLG TYPE STRING,
DOCFLG TYPE STRING,
SYSST TYPE STRING,
USRST TYPE STRING,
ACTSTEP TYPE STRING,
ACTPROC TYPE STRING,
ACTTYP TYPE STRING,
DISPFLG TYPE STRING,
UPDFLG TYPE STRING,
CTRLFLG1 TYPE STRING,
CTRLFLG2 TYPE STRING,
CTRLFLG3 TYPE STRING,
STATUS TYPE STRING,
STEP TYPE STRING,
FEEDBACK TYPE STRING,
CHNAME TYPE STRING,
CHDATE TYPE STRING,
CHTIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCAMI_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_WCAMI_STR-MANDT sy-vline 
WA_WCAMI_STR-WCNR sy-vline 
WA_WCAMI_STR-LSTID sy-vline 
WA_WCAMI_STR-WCITM sy-vline 
WA_WCAMI_STR-OBJNR sy-vline 
WA_WCAMI_STR-ITMTYP sy-vline 
WA_WCAMI_STR-SEQ sy-vline 
WA_WCAMI_STR-PRED sy-vline 
WA_WCAMI_STR-SUCC sy-vline 
WA_WCAMI_STR-CCOBJ sy-vline 
WA_WCAMI_STR-CCTYP sy-vline 
WA_WCAMI_STR-CCOBJNR sy-vline 
WA_WCAMI_STR-STXT sy-vline 
WA_WCAMI_STR-TGGRP sy-vline 
WA_WCAMI_STR-TGSTEP sy-vline 
WA_WCAMI_STR-TGPROC sy-vline 
WA_WCAMI_STR-TGTYP sy-vline 
WA_WCAMI_STR-TGSEQ sy-vline 
WA_WCAMI_STR-TGTXT sy-vline 
WA_WCAMI_STR-UNSTEP sy-vline 
WA_WCAMI_STR-UNPROC sy-vline 
WA_WCAMI_STR-UNTYP sy-vline 
WA_WCAMI_STR-UNSEQ sy-vline 
WA_WCAMI_STR-UNTXT sy-vline 
WA_WCAMI_STR-PHBLFLG sy-vline 
WA_WCAMI_STR-PHBLTYP sy-vline 
WA_WCAMI_STR-PHBLNR sy-vline 
WA_WCAMI_STR-TGFLG sy-vline 
WA_WCAMI_STR-TGFORM sy-vline 
WA_WCAMI_STR-TGNR sy-vline 
WA_WCAMI_STR-UNFORM sy-vline 
WA_WCAMI_STR-UNNR sy-vline 
WA_WCAMI_STR-CONTROL sy-vline 
WA_WCAMI_STR-LOCATION sy-vline 
WA_WCAMI_STR-LFLG sy-vline 
WA_WCAMI_STR-DOCFLG sy-vline 
WA_WCAMI_STR-SYSST sy-vline 
WA_WCAMI_STR-USRST sy-vline 
WA_WCAMI_STR-ACTSTEP sy-vline 
WA_WCAMI_STR-ACTPROC sy-vline 
WA_WCAMI_STR-ACTTYP sy-vline 
WA_WCAMI_STR-DISPFLG sy-vline 
WA_WCAMI_STR-UPDFLG sy-vline 
WA_WCAMI_STR-CTRLFLG1 sy-vline 
WA_WCAMI_STR-CTRLFLG2 sy-vline 
WA_WCAMI_STR-CTRLFLG3 sy-vline 
WA_WCAMI_STR-STATUS sy-vline 
WA_WCAMI_STR-STEP sy-vline 
WA_WCAMI_STR-FEEDBACK sy-vline 
WA_WCAMI_STR-CHNAME sy-vline 
WA_WCAMI_STR-CHDATE sy-vline 
WA_WCAMI_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.