ABAP Select data from SAP table CVAUTH_DOCREF_BUFFER into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CVAUTH_DOCREF_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 CVAUTH_DOCREF_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 CVAUTH_DOCREF_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_CVAUTH_DOCREF_BUFFER TYPE STANDARD TABLE OF CVAUTH_DOCREF_BUFFER,
      WA_CVAUTH_DOCREF_BUFFER TYPE CVAUTH_DOCREF_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: <CVAUTH_DOCREF_BUFFER> TYPE CVAUTH_DOCREF_BUFFER.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CVAUTH_DOCREF_BUFFER
*  INTO TABLE @DATA(IT_CVAUTH_DOCREF_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_CVAUTH_DOCREF_BUFFER INDEX 1 INTO DATA(WA_CVAUTH_DOCREF_BUFFER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CVAUTH_DOCREF_BUFFER>-DOKNR = 1.
<CVAUTH_DOCREF_BUFFER>-DOKAR = 1.
<CVAUTH_DOCREF_BUFFER>-DOKTL = 1.
<CVAUTH_DOCREF_BUFFER>-DOKVR = 1.
<CVAUTH_DOCREF_BUFFER>-PARDOKNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CVAUTH_DOCREF_BUFFER-PARDOKAR, sy-vline,
  WA_CVAUTH_DOCREF_BUFFER-PARDOKTL, sy-vline,
  WA_CVAUTH_DOCREF_BUFFER-PARDOKVR, sy-vline,
  WA_CVAUTH_DOCREF_BUFFER-DOCREF, sy-vline,
  WA_CVAUTH_DOCREF_BUFFER-GUID, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_CVAUTH_DOCREF_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_CVAUTH_DOCREF_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_CVAUTH_DOCREF_BUFFER INTO WA_CVAUTH_DOCREF_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 DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CVAUTH_DOCREF_BUFFER-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CVAUTH_DOCREF_BUFFER-DOKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PARDOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CVAUTH_DOCREF_BUFFER-PARDOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CVAUTH_DOCREF_BUFFER-PARDOKNR.
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_CVAUTH_DOCREF_BUFFER_STR, 
DOKNR TYPE STRING,
DOKAR TYPE STRING,
DOKTL TYPE STRING,
DOKVR TYPE STRING,
PARDOKNR TYPE STRING,
PARDOKAR TYPE STRING,
PARDOKTL TYPE STRING,
PARDOKVR TYPE STRING,
DOCREF TYPE STRING,
GUID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CVAUTH_DOCREF_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_CVAUTH_DOCREF_BUFFER_STR-DOKNR sy-vline 
WA_CVAUTH_DOCREF_BUFFER_STR-DOKAR sy-vline 
WA_CVAUTH_DOCREF_BUFFER_STR-DOKTL sy-vline 
WA_CVAUTH_DOCREF_BUFFER_STR-DOKVR sy-vline 
WA_CVAUTH_DOCREF_BUFFER_STR-PARDOKNR sy-vline 
WA_CVAUTH_DOCREF_BUFFER_STR-PARDOKAR sy-vline 
WA_CVAUTH_DOCREF_BUFFER_STR-PARDOKTL sy-vline 
WA_CVAUTH_DOCREF_BUFFER_STR-PARDOKVR sy-vline 
WA_CVAUTH_DOCREF_BUFFER_STR-DOCREF sy-vline 
WA_CVAUTH_DOCREF_BUFFER_STR-GUID sy-vline      INTO ld_text SEPARATED BY SPACE.

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