ABAP Select data from SAP table QCVK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM QCVK
*  INTO TABLE @DATA(IT_QCVK2).
*--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_QCVK INDEX 1 INTO DATA(WA_QCVK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<QCVK>-MANDANT = 1.
<QCVK>-CTYP = 1.
<QCVK>-VORLNR = 1.
<QCVK>-VERSION = 1.
<QCVK>-SORTFELD = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_QCVK-GUELTIGAB, sy-vline,
  WA_QCVK-OBJNR, sy-vline,
  WA_QCVK-OBTYP, sy-vline,
  WA_QCVK-STSMA, sy-vline,
  WA_QCVK-ERSTELLER, sy-vline,
  WA_QCVK-ERSTELDAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_QCVK 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_QCVK 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_QCVK INTO WA_QCVK.


*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 VERSION
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_QCVK-VERSION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_QCVK-VERSION.
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_QCVK_STR, 
MANDANT TYPE STRING,
CTYP TYPE STRING,
VORLNR TYPE STRING,
VERSION TYPE STRING,
SORTFELD TYPE STRING,
GUELTIGAB TYPE STRING,
OBJNR TYPE STRING,
OBTYP TYPE STRING,
STSMA TYPE STRING,
ERSTELLER TYPE STRING,
ERSTELDAT TYPE STRING,
AENDERER TYPE STRING,
AENDERDAT TYPE STRING,
TDFORM TYPE STRING,
KZGUTLOSE TYPE STRING,
MINQKZ TYPE STRING,
KZLASTLOT TYPE STRING,
KZLIEFSCH TYPE STRING,
HERKUNFT TYPE STRING,
ART TYPE STRING,
KONSISTENT TYPE STRING,
KURZTEXT TYPE STRING,
LTEXTKZ TYPE STRING,
WITHTRANSF TYPE STRING,
QDI_NOPDF TYPE STRING,
ALSTF TYPE STRING,
ADBFORM TYPE STRING,
QKZ_USEADB TYPE STRING,
CHAR_FIELD_CONF TYPE STRING,
CHANGEDDATETIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_QCVK_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_QCVK_STR-MANDANT sy-vline 
WA_QCVK_STR-CTYP sy-vline 
WA_QCVK_STR-VORLNR sy-vline 
WA_QCVK_STR-VERSION sy-vline 
WA_QCVK_STR-SORTFELD sy-vline 
WA_QCVK_STR-GUELTIGAB sy-vline 
WA_QCVK_STR-OBJNR sy-vline 
WA_QCVK_STR-OBTYP sy-vline 
WA_QCVK_STR-STSMA sy-vline 
WA_QCVK_STR-ERSTELLER sy-vline 
WA_QCVK_STR-ERSTELDAT sy-vline 
WA_QCVK_STR-AENDERER sy-vline 
WA_QCVK_STR-AENDERDAT sy-vline 
WA_QCVK_STR-TDFORM sy-vline 
WA_QCVK_STR-KZGUTLOSE sy-vline 
WA_QCVK_STR-MINQKZ sy-vline 
WA_QCVK_STR-KZLASTLOT sy-vline 
WA_QCVK_STR-KZLIEFSCH sy-vline 
WA_QCVK_STR-HERKUNFT sy-vline 
WA_QCVK_STR-ART sy-vline 
WA_QCVK_STR-KONSISTENT sy-vline 
WA_QCVK_STR-KURZTEXT sy-vline 
WA_QCVK_STR-LTEXTKZ sy-vline 
WA_QCVK_STR-WITHTRANSF sy-vline 
WA_QCVK_STR-QDI_NOPDF sy-vline 
WA_QCVK_STR-ALSTF sy-vline 
WA_QCVK_STR-ADBFORM sy-vline 
WA_QCVK_STR-QKZ_USEADB sy-vline 
WA_QCVK_STR-CHAR_FIELD_CONF sy-vline 
WA_QCVK_STR-CHANGEDDATETIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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