ABAP Select data from SAP table VNCSSN into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VNCSSN 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 VNCSSN. 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 VNCSSN 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_VNCSSN TYPE STANDARD TABLE OF VNCSSN,
      WA_VNCSSN TYPE VNCSSN,
      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: <VNCSSN> TYPE VNCSSN.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNCSSN
*  INTO TABLE @DATA(IT_VNCSSN2).
*--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_VNCSSN INDEX 1 INTO DATA(WA_VNCSSN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNCSSN>-MANDT = 1.
<VNCSSN>-FALNR = 1.
<VNCSSN>-EINRI = 1.
<VNCSSN>-SEQID = 1.
<VNCSSN>-SEQMR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNCSSN-STAND, sy-vline,
  WA_VNCSSN-STVER, sy-vline,
  WA_VNCSSN-NTOWNERCODE, sy-vline,
  WA_VNCSSN-NTNR, sy-vline,
  WA_VNCSSN-SGOWNERCODE, sy-vline,
  WA_VNCSSN-SGNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNCSSN 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_VNCSSN 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_VNCSSN INTO WA_VNCSSN.


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

*Conversion exit ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNCSSN-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNCSSN-EINRI.
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_VNCSSN_STR, 
MANDT TYPE STRING,
FALNR TYPE STRING,
EINRI TYPE STRING,
SEQID TYPE STRING,
SEQMR TYPE STRING,
STAND TYPE STRING,
STVER TYPE STRING,
NTOWNERCODE TYPE STRING,
NTNR TYPE STRING,
SGOWNERCODE TYPE STRING,
SGNR TYPE STRING,
DCSTATI TYPE STRING,
RECDESC TYPE STRING,
ERDAT TYPE STRING,
ERTIM TYPE STRING,
ERUSR TYPE STRING,
AMBTEMP TYPE STRING,
PCNTR TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNCSSN_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_VNCSSN_STR-MANDT sy-vline 
WA_VNCSSN_STR-FALNR sy-vline 
WA_VNCSSN_STR-EINRI sy-vline 
WA_VNCSSN_STR-SEQID sy-vline 
WA_VNCSSN_STR-SEQMR sy-vline 
WA_VNCSSN_STR-STAND sy-vline 
WA_VNCSSN_STR-STVER sy-vline 
WA_VNCSSN_STR-NTOWNERCODE sy-vline 
WA_VNCSSN_STR-NTNR sy-vline 
WA_VNCSSN_STR-SGOWNERCODE sy-vline 
WA_VNCSSN_STR-SGNR sy-vline 
WA_VNCSSN_STR-DCSTATI sy-vline 
WA_VNCSSN_STR-RECDESC sy-vline 
WA_VNCSSN_STR-ERDAT sy-vline 
WA_VNCSSN_STR-ERTIM sy-vline 
WA_VNCSSN_STR-ERUSR sy-vline 
WA_VNCSSN_STR-AMBTEMP sy-vline 
WA_VNCSSN_STR-PCNTR sy-vline 
WA_VNCSSN_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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