ABAP Select data from SAP table WCAHE 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 WCAHE 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 WCAHE. 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 WCAHE 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_WCAHE TYPE STANDARD TABLE OF WCAHE,
      WA_WCAHE TYPE WCAHE,
      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: <WCAHE> TYPE WCAHE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCAHE
*  INTO TABLE @DATA(IT_WCAHE2).
*--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_WCAHE INDEX 1 INTO DATA(WA_WCAHE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCAHE>-MANDT = 1.
<WCAHE>-WCNR = 1.
<WCAHE>-OBJNR = 1.
<WCAHE>-WCTYP = 1.
<WCAHE>-WCUSE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCAHE-STXT, sy-vline,
  WA_WCAHE-LFLG, sy-vline,
  WA_WCAHE-DELFLG, sy-vline,
  WA_WCAHE-UNTGFLG, sy-vline,
  WA_WCAHE-TGFLG, sy-vline,
  WA_WCAHE-CATFLG1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCAHE 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_WCAHE 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_WCAHE INTO WA_WCAHE.


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

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

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

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

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

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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_WCAHE-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCAHE-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_WCAHE_STR, 
MANDT TYPE STRING,
WCNR TYPE STRING,
OBJNR TYPE STRING,
WCTYP TYPE STRING,
WCUSE TYPE STRING,
STXT TYPE STRING,
LFLG TYPE STRING,
DELFLG TYPE STRING,
UNTGFLG TYPE STRING,
TGFLG 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,
WCSTSMA TYPE STRING,
WCITMSTSMA TYPE STRING,
REFOBJ TYPE STRING,
REMARKFLG1 TYPE STRING,
REMARKFLG2 TYPE STRING,
WT_NO TYPE STRING,
WT_DESC TYPE STRING,
SHIFT_CHIEF TYPE STRING,
GUARDIAN TYPE STRING,
OPERATOR TYPE STRING,
ON_DUTY TYPE STRING,
START_DATE TYPE STRING,
START_TIME TYPE STRING,
END_DATE TYPE STRING,
END_TIME TYPE STRING,
APPROVE_DATE TYPE STRING,
APPROVE_TIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCAHE_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_WCAHE_STR-MANDT sy-vline 
WA_WCAHE_STR-WCNR sy-vline 
WA_WCAHE_STR-OBJNR sy-vline 
WA_WCAHE_STR-WCTYP sy-vline 
WA_WCAHE_STR-WCUSE sy-vline 
WA_WCAHE_STR-STXT sy-vline 
WA_WCAHE_STR-LFLG sy-vline 
WA_WCAHE_STR-DELFLG sy-vline 
WA_WCAHE_STR-UNTGFLG sy-vline 
WA_WCAHE_STR-TGFLG sy-vline 
WA_WCAHE_STR-CATFLG1 sy-vline 
WA_WCAHE_STR-CATFLG2 sy-vline 
WA_WCAHE_STR-INGRP sy-vline 
WA_WCAHE_STR-IWERK sy-vline 
WA_WCAHE_STR-WKCRTYP sy-vline 
WA_WCAHE_STR-WKCRID sy-vline 
WA_WCAHE_STR-BEGRU sy-vline 
WA_WCAHE_STR-DATEFR sy-vline 
WA_WCAHE_STR-TIMEFR sy-vline 
WA_WCAHE_STR-DATETO sy-vline 
WA_WCAHE_STR-TIMETO sy-vline 
WA_WCAHE_STR-ANLZU sy-vline 
WA_WCAHE_STR-RCTIME sy-vline 
WA_WCAHE_STR-RCUNIT sy-vline 
WA_WCAHE_STR-PRIOK sy-vline 
WA_WCAHE_STR-TPLNR sy-vline 
WA_WCAHE_STR-EQUNR sy-vline 
WA_WCAHE_STR-LNKFLG sy-vline 
WA_WCAHE_STR-TRAIN sy-vline 
WA_WCAHE_STR-CRNAME sy-vline 
WA_WCAHE_STR-CRDATE sy-vline 
WA_WCAHE_STR-CRTIME sy-vline 
WA_WCAHE_STR-CHNAME sy-vline 
WA_WCAHE_STR-CHDATE sy-vline 
WA_WCAHE_STR-CHTIME sy-vline 
WA_WCAHE_STR-PSPEL sy-vline 
WA_WCAHE_STR-AUFNT sy-vline 
WA_WCAHE_STR-VORNR sy-vline 
WA_WCAHE_STR-BDATE sy-vline 
WA_WCAHE_STR-BTIME sy-vline 
WA_WCAHE_STR-EDATE sy-vline 
WA_WCAHE_STR-ETIME sy-vline 
WA_WCAHE_STR-TSDATE sy-vline 
WA_WCAHE_STR-TSTIME sy-vline 
WA_WCAHE_STR-TFDATE sy-vline 
WA_WCAHE_STR-TFTIME sy-vline 
WA_WCAHE_STR-ESDATE sy-vline 
WA_WCAHE_STR-ESTIME sy-vline 
WA_WCAHE_STR-EFDATE sy-vline 
WA_WCAHE_STR-EFTIME sy-vline 
WA_WCAHE_STR-LSDATE sy-vline 
WA_WCAHE_STR-LSTIME sy-vline 
WA_WCAHE_STR-LFDATE sy-vline 
WA_WCAHE_STR-LFTIME sy-vline 
WA_WCAHE_STR-PSDATE sy-vline 
WA_WCAHE_STR-PSTIME sy-vline 
WA_WCAHE_STR-PFDATE sy-vline 
WA_WCAHE_STR-PFTIME sy-vline 
WA_WCAHE_STR-ASDATE sy-vline 
WA_WCAHE_STR-ASTIME sy-vline 
WA_WCAHE_STR-AFDATE sy-vline 
WA_WCAHE_STR-AFTIME sy-vline 
WA_WCAHE_STR-ETAPE sy-vline 
WA_WCAHE_STR-DOCFLG sy-vline 
WA_WCAHE_STR-WCSTSMA sy-vline 
WA_WCAHE_STR-WCITMSTSMA sy-vline 
WA_WCAHE_STR-REFOBJ sy-vline 
WA_WCAHE_STR-REMARKFLG1 sy-vline 
WA_WCAHE_STR-REMARKFLG2 sy-vline 
WA_WCAHE_STR-WT_NO sy-vline 
WA_WCAHE_STR-WT_DESC sy-vline 
WA_WCAHE_STR-SHIFT_CHIEF sy-vline 
WA_WCAHE_STR-GUARDIAN sy-vline 
WA_WCAHE_STR-OPERATOR sy-vline 
WA_WCAHE_STR-ON_DUTY sy-vline 
WA_WCAHE_STR-START_DATE sy-vline 
WA_WCAHE_STR-START_TIME sy-vline 
WA_WCAHE_STR-END_DATE sy-vline 
WA_WCAHE_STR-END_TIME sy-vline 
WA_WCAHE_STR-APPROVE_DATE sy-vline 
WA_WCAHE_STR-APPROVE_TIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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