ABAP Select data from SAP table WCAW into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WCAW 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 WCAW. 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 WCAW 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_WCAW TYPE STANDARD TABLE OF WCAW,
      WA_WCAW TYPE WCAW,
      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: <WCAW> TYPE WCAW.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCAW
*  INTO TABLE @DATA(IT_WCAW2).
*--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_WCAW INDEX 1 INTO DATA(WA_WCAW2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCAW>-MANDT = 1.
<WCAW>-WAPNR = 1.
<WCAW>-OBJNR = 1.
<WCAW>-WAPUSE = 1.
<WCAW>-STXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCAW-LFLG, sy-vline,
  WA_WCAW-DELFLG, sy-vline,
  WA_WCAW-REQUALFLG, sy-vline,
  WA_WCAW-CATFLG1, sy-vline,
  WA_WCAW-CATFLG2, sy-vline,
  WA_WCAW-INGRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCAW 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_WCAW 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_WCAW INTO WA_WCAW.


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

*Conversion exit CUNIT, internal->external for field RCUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WCAW-RCUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCAW-RCUNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_WCAW-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCAW-TPLNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ABPSP, internal->external for field PSPEL
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_WCAW-PSPEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCAW-PSPEL.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_WCAW-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCAW-VORNR.
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_WCAW_STR, 
MANDT TYPE STRING,
WAPNR TYPE STRING,
OBJNR TYPE STRING,
WAPUSE TYPE STRING,
STXT TYPE STRING,
LFLG TYPE STRING,
DELFLG TYPE STRING,
REQUALFLG TYPE STRING,
CATFLG1 TYPE STRING,
CATFLG2 TYPE STRING,
INGRP TYPE STRING,
IWERK TYPE STRING,
WKCRTYP TYPE STRING,
WKCRID TYPE STRING,
BEGRU TYPE STRING,
DATEFR TYPE STRING,
TIMEFR TYPE STRING,
DATETO TYPE STRING,
TIMETO TYPE STRING,
ANLZU TYPE STRING,
RCTIME TYPE STRING,
RCUNIT TYPE STRING,
PRIOK TYPE STRING,
TPLNR TYPE STRING,
EQUNR TYPE STRING,
LNKFLG TYPE STRING,
TRAIN TYPE STRING,
CRNAME TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,
CHNAME TYPE STRING,
CHDATE TYPE STRING,
CHTIME TYPE STRING,
PSPEL TYPE STRING,
AUFNT TYPE STRING,
VORNR TYPE STRING,
BDATE TYPE STRING,
BTIME TYPE STRING,
EDATE TYPE STRING,
ETIME TYPE STRING,
TSDATE TYPE STRING,
TSTIME TYPE STRING,
TFDATE TYPE STRING,
TFTIME TYPE STRING,
ESDATE TYPE STRING,
ESTIME TYPE STRING,
EFDATE TYPE STRING,
EFTIME TYPE STRING,
LSDATE TYPE STRING,
LSTIME TYPE STRING,
LFDATE TYPE STRING,
LFTIME TYPE STRING,
PSDATE TYPE STRING,
PSTIME TYPE STRING,
PFDATE TYPE STRING,
PFTIME TYPE STRING,
ASDATE TYPE STRING,
ASTIME TYPE STRING,
AFDATE TYPE STRING,
AFTIME TYPE STRING,
ETAPE TYPE STRING,
DOCFLG TYPE STRING,
WAPSTSMA TYPE STRING,
REFOBJ TYPE STRING,
REMARKFLG1 TYPE STRING,
REMARKFLG2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCAW_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_WCAW_STR-MANDT sy-vline 
WA_WCAW_STR-WAPNR sy-vline 
WA_WCAW_STR-OBJNR sy-vline 
WA_WCAW_STR-WAPUSE sy-vline 
WA_WCAW_STR-STXT sy-vline 
WA_WCAW_STR-LFLG sy-vline 
WA_WCAW_STR-DELFLG sy-vline 
WA_WCAW_STR-REQUALFLG sy-vline 
WA_WCAW_STR-CATFLG1 sy-vline 
WA_WCAW_STR-CATFLG2 sy-vline 
WA_WCAW_STR-INGRP sy-vline 
WA_WCAW_STR-IWERK sy-vline 
WA_WCAW_STR-WKCRTYP sy-vline 
WA_WCAW_STR-WKCRID sy-vline 
WA_WCAW_STR-BEGRU sy-vline 
WA_WCAW_STR-DATEFR sy-vline 
WA_WCAW_STR-TIMEFR sy-vline 
WA_WCAW_STR-DATETO sy-vline 
WA_WCAW_STR-TIMETO sy-vline 
WA_WCAW_STR-ANLZU sy-vline 
WA_WCAW_STR-RCTIME sy-vline 
WA_WCAW_STR-RCUNIT sy-vline 
WA_WCAW_STR-PRIOK sy-vline 
WA_WCAW_STR-TPLNR sy-vline 
WA_WCAW_STR-EQUNR sy-vline 
WA_WCAW_STR-LNKFLG sy-vline 
WA_WCAW_STR-TRAIN sy-vline 
WA_WCAW_STR-CRNAME sy-vline 
WA_WCAW_STR-CRDATE sy-vline 
WA_WCAW_STR-CRTIME sy-vline 
WA_WCAW_STR-CHNAME sy-vline 
WA_WCAW_STR-CHDATE sy-vline 
WA_WCAW_STR-CHTIME sy-vline 
WA_WCAW_STR-PSPEL sy-vline 
WA_WCAW_STR-AUFNT sy-vline 
WA_WCAW_STR-VORNR sy-vline 
WA_WCAW_STR-BDATE sy-vline 
WA_WCAW_STR-BTIME sy-vline 
WA_WCAW_STR-EDATE sy-vline 
WA_WCAW_STR-ETIME sy-vline 
WA_WCAW_STR-TSDATE sy-vline 
WA_WCAW_STR-TSTIME sy-vline 
WA_WCAW_STR-TFDATE sy-vline 
WA_WCAW_STR-TFTIME sy-vline 
WA_WCAW_STR-ESDATE sy-vline 
WA_WCAW_STR-ESTIME sy-vline 
WA_WCAW_STR-EFDATE sy-vline 
WA_WCAW_STR-EFTIME sy-vline 
WA_WCAW_STR-LSDATE sy-vline 
WA_WCAW_STR-LSTIME sy-vline 
WA_WCAW_STR-LFDATE sy-vline 
WA_WCAW_STR-LFTIME sy-vline 
WA_WCAW_STR-PSDATE sy-vline 
WA_WCAW_STR-PSTIME sy-vline 
WA_WCAW_STR-PFDATE sy-vline 
WA_WCAW_STR-PFTIME sy-vline 
WA_WCAW_STR-ASDATE sy-vline 
WA_WCAW_STR-ASTIME sy-vline 
WA_WCAW_STR-AFDATE sy-vline 
WA_WCAW_STR-AFTIME sy-vline 
WA_WCAW_STR-ETAPE sy-vline 
WA_WCAW_STR-DOCFLG sy-vline 
WA_WCAW_STR-WAPSTSMA sy-vline 
WA_WCAW_STR-REFOBJ sy-vline 
WA_WCAW_STR-REMARKFLG1 sy-vline 
WA_WCAW_STR-REMARKFLG2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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