ABAP Select data from SAP table VICNNT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VICNNT
*  INTO TABLE @DATA(IT_VICNNT2).
*--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_VICNNT INDEX 1 INTO DATA(WA_VICNNT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VICNNT>-MANDT = 1.
<VICNNT>-INTRENO = 1.
<VICNNT>-NTNO = 1.
<VICNNT>-NTCATE = 1.
<VICNNT>-NTACTIVE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VICNNT-NTACTIVATEDON, sy-vline,
  WA_VICNNT-NTREVERSEDON, sy-vline,
  WA_VICNNT-RERF, sy-vline,
  WA_VICNNT-DERF, sy-vline,
  WA_VICNNT-TERF, sy-vline,
  WA_VICNNT-REHER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VICNNT 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_VICNNT 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_VICNNT INTO WA_VICNNT.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_VICNNT_STR, 
MANDT TYPE STRING,
INTRENO TYPE STRING,
NTNO TYPE STRING,
NTCATE TYPE STRING,
NTACTIVE TYPE STRING,
NTACTIVATEDON TYPE STRING,
NTREVERSEDON TYPE STRING,
RERF TYPE STRING,
DERF TYPE STRING,
TERF TYPE STRING,
REHER TYPE STRING,
RBEAR TYPE STRING,
DBEAR TYPE STRING,
TBEAR TYPE STRING,
RBHER TYPE STRING,
NTPER TYPE STRING,
NTRECEIPT TYPE STRING,
NTPARTY TYPE STRING,
NTEXTRAORD TYPE STRING,
NTREASON TYPE STRING,
NTREASONREJ TYPE STRING,
NTAPPROVEDON TYPE STRING,
NTREJECTEDON TYPE STRING,
NTOBJECTIONON TYPE STRING,
NTLEGALDEPTON TYPE STRING,
NTWITHDRAWALON TYPE STRING,
NTREQUESTON TYPE STRING,
NTFOLLPOSTDUE TYPE STRING,
NTREQUESTUSE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VICNNT_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_VICNNT_STR-MANDT sy-vline 
WA_VICNNT_STR-INTRENO sy-vline 
WA_VICNNT_STR-NTNO sy-vline 
WA_VICNNT_STR-NTCATE sy-vline 
WA_VICNNT_STR-NTACTIVE sy-vline 
WA_VICNNT_STR-NTACTIVATEDON sy-vline 
WA_VICNNT_STR-NTREVERSEDON sy-vline 
WA_VICNNT_STR-RERF sy-vline 
WA_VICNNT_STR-DERF sy-vline 
WA_VICNNT_STR-TERF sy-vline 
WA_VICNNT_STR-REHER sy-vline 
WA_VICNNT_STR-RBEAR sy-vline 
WA_VICNNT_STR-DBEAR sy-vline 
WA_VICNNT_STR-TBEAR sy-vline 
WA_VICNNT_STR-RBHER sy-vline 
WA_VICNNT_STR-NTPER sy-vline 
WA_VICNNT_STR-NTRECEIPT sy-vline 
WA_VICNNT_STR-NTPARTY sy-vline 
WA_VICNNT_STR-NTEXTRAORD sy-vline 
WA_VICNNT_STR-NTREASON sy-vline 
WA_VICNNT_STR-NTREASONREJ sy-vline 
WA_VICNNT_STR-NTAPPROVEDON sy-vline 
WA_VICNNT_STR-NTREJECTEDON sy-vline 
WA_VICNNT_STR-NTOBJECTIONON sy-vline 
WA_VICNNT_STR-NTLEGALDEPTON sy-vline 
WA_VICNNT_STR-NTWITHDRAWALON sy-vline 
WA_VICNNT_STR-NTREQUESTON sy-vline 
WA_VICNNT_STR-NTFOLLPOSTDUE sy-vline 
WA_VICNNT_STR-NTREQUESTUSE sy-vline      INTO ld_text SEPARATED BY SPACE.

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