ABAP Select data from SAP table WFCD_BUFFER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WFCD_BUFFER
*  INTO TABLE @DATA(IT_WFCD_BUFFER2).
*--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_WFCD_BUFFER INDEX 1 INTO DATA(WA_WFCD_BUFFER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WFCD_BUFFER>-HEADER = 1.
<WFCD_BUFFER>-MANDANT = 1.
<WFCD_BUFFER>-OBJECTCLAS = 1.
<WFCD_BUFFER>-OBJECTID = 1.
<WFCD_BUFFER>-CHANGENR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WFCD_BUFFER-USERNAME, sy-vline,
  WA_WFCD_BUFFER-UDATE, sy-vline,
  WA_WFCD_BUFFER-UTIME, sy-vline,
  WA_WFCD_BUFFER-TCODE, sy-vline,
  WA_WFCD_BUFFER-PLANCHNGNR, sy-vline,
  WA_WFCD_BUFFER-ACT_CHNGNO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WFCD_BUFFER 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_WFCD_BUFFER 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_WFCD_BUFFER INTO WA_WFCD_BUFFER.


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

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

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

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

*Conversion exit ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_WFCD_BUFFER-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WFCD_BUFFER-LANGU.
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_WFCD_BUFFER_STR, 
HEADER TYPE STRING,
MANDANT TYPE STRING,
OBJECTCLAS TYPE STRING,
OBJECTID TYPE STRING,
CHANGENR TYPE STRING,
USERNAME TYPE STRING,
UDATE TYPE STRING,
UTIME TYPE STRING,
TCODE TYPE STRING,
PLANCHNGNR TYPE STRING,
ACT_CHNGNO TYPE STRING,
WAS_PLANND TYPE STRING,
CHANGE_IND TYPE STRING,
LANGU TYPE STRING,
VERSION TYPE STRING,
_DATAAGING TYPE STRING,
POS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WFCD_BUFFER_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_WFCD_BUFFER_STR-HEADER sy-vline 
WA_WFCD_BUFFER_STR-MANDANT sy-vline 
WA_WFCD_BUFFER_STR-OBJECTCLAS sy-vline 
WA_WFCD_BUFFER_STR-OBJECTID sy-vline 
WA_WFCD_BUFFER_STR-CHANGENR sy-vline 
WA_WFCD_BUFFER_STR-USERNAME sy-vline 
WA_WFCD_BUFFER_STR-UDATE sy-vline 
WA_WFCD_BUFFER_STR-UTIME sy-vline 
WA_WFCD_BUFFER_STR-TCODE sy-vline 
WA_WFCD_BUFFER_STR-PLANCHNGNR sy-vline 
WA_WFCD_BUFFER_STR-ACT_CHNGNO sy-vline 
WA_WFCD_BUFFER_STR-WAS_PLANND sy-vline 
WA_WFCD_BUFFER_STR-CHANGE_IND sy-vline 
WA_WFCD_BUFFER_STR-LANGU sy-vline 
WA_WFCD_BUFFER_STR-VERSION sy-vline 
WA_WFCD_BUFFER_STR-_DATAAGING sy-vline 
WA_WFCD_BUFFER_STR-POS sy-vline      INTO ld_text SEPARATED BY SPACE.

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