ABAP Select data from SAP table WCB_HEAD_FIELDS_PER_COND into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCB_HEAD_FIELDS_PER_COND
*  INTO TABLE @DATA(IT_WCB_HEAD_FIELDS_PER_COND2).
*--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_WCB_HEAD_FIELDS_PER_COND INDEX 1 INTO DATA(WA_WCB_HEAD_FIELDS_PER_COND2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCB_HEAD_FIELDS_PER_COND>-KNUMV = 1.
<WCB_HEAD_FIELDS_PER_COND>-KPOSN = 1.
<WCB_HEAD_FIELDS_PER_COND>-STUNR = 1.
<WCB_HEAD_FIELDS_PER_COND>-ZAEHK = 1.
<WCB_HEAD_FIELDS_PER_COND>-EKORG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCB_HEAD_FIELDS_PER_COND-EKGRP, sy-vline,
  WA_WCB_HEAD_FIELDS_PER_COND-LIFRE, sy-vline,
  WA_WCB_HEAD_FIELDS_PER_COND-KALSM, sy-vline,
  WA_WCB_HEAD_FIELDS_PER_COND-LFART, sy-vline,
  WA_WCB_HEAD_FIELDS_PER_COND-WAERL, sy-vline,
  WA_WCB_HEAD_FIELDS_PER_COND-BUKRS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCB_HEAD_FIELDS_PER_COND 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_WCB_HEAD_FIELDS_PER_COND 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_WCB_HEAD_FIELDS_PER_COND INTO WA_WCB_HEAD_FIELDS_PER_COND.


*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 LIFRE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WCB_HEAD_FIELDS_PER_COND-LIFRE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCB_HEAD_FIELDS_PER_COND-LIFRE.
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_WCB_HEAD_FIELDS_PER_COND_STR, 
KNUMV TYPE STRING,
KPOSN TYPE STRING,
STUNR TYPE STRING,
ZAEHK TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
LIFRE TYPE STRING,
KALSM TYPE STRING,
LFART TYPE STRING,
WAERL TYPE STRING,
BUKRS TYPE STRING,
KAPPL TYPE STRING,
KALSE TYPE STRING,
KALSK TYPE STRING,
KNUMH TYPE STRING,
KOPOS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCB_HEAD_FIELDS_PER_COND_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_WCB_HEAD_FIELDS_PER_COND_STR-KNUMV sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-KPOSN sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-STUNR sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-ZAEHK sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-EKORG sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-EKGRP sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-LIFRE sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-KALSM sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-LFART sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-WAERL sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-BUKRS sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-KAPPL sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-KALSE sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-KALSK sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-KNUMH sy-vline 
WA_WCB_HEAD_FIELDS_PER_COND_STR-KOPOS sy-vline      INTO ld_text SEPARATED BY SPACE.

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