ABAP Select data from SAP table VVN_TNAPR_WN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VVN_TNAPR_WN
*  INTO TABLE @DATA(IT_VVN_TNAPR_WN2).
*--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_VVN_TNAPR_WN INDEX 1 INTO DATA(WA_VVN_TNAPR_WN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VVN_TNAPR_WN>-MANDT = 1.
<VVN_TNAPR_WN>-KSCHL = 1.
<VVN_TNAPR_WN>-NACHA = 1.
<VVN_TNAPR_WN>-KAPPL = 1.
<VVN_TNAPR_WN>-DESCRP_KAPPL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VVN_TNAPR_WN-DESCRP_KSCHL, sy-vline,
  WA_VVN_TNAPR_WN-PGNAM, sy-vline,
  WA_VVN_TNAPR_WN-RONAM, sy-vline,
  WA_VVN_TNAPR_WN-FONAM, sy-vline,
  WA_VVN_TNAPR_WN-PGNAM2, sy-vline,
  WA_VVN_TNAPR_WN-RONAM2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VVN_TNAPR_WN 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_VVN_TNAPR_WN 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_VVN_TNAPR_WN INTO WA_VVN_TNAPR_WN.


*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_VVN_TNAPR_WN_STR, 
MANDT TYPE STRING,
KSCHL TYPE STRING,
NACHA TYPE STRING,
KAPPL TYPE STRING,
DESCRP_KAPPL TYPE STRING,
DESCRP_KSCHL TYPE STRING,
PGNAM TYPE STRING,
RONAM TYPE STRING,
FONAM TYPE STRING,
PGNAM2 TYPE STRING,
RONAM2 TYPE STRING,
FONAM2 TYPE STRING,
PGNAM3 TYPE STRING,
RONAM3 TYPE STRING,
FONAM3 TYPE STRING,
PGNAM4 TYPE STRING,
RONAM4 TYPE STRING,
FONAM4 TYPE STRING,
PGNAM5 TYPE STRING,
RONAM5 TYPE STRING,
FONAM5 TYPE STRING,
FUNCNAME TYPE STRING,
SFORM TYPE STRING,
FORMTYPE TYPE STRING,
SFORM2 TYPE STRING,
FORMTYPE2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VVN_TNAPR_WN_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_VVN_TNAPR_WN_STR-MANDT sy-vline 
WA_VVN_TNAPR_WN_STR-KSCHL sy-vline 
WA_VVN_TNAPR_WN_STR-NACHA sy-vline 
WA_VVN_TNAPR_WN_STR-KAPPL sy-vline 
WA_VVN_TNAPR_WN_STR-DESCRP_KAPPL sy-vline 
WA_VVN_TNAPR_WN_STR-DESCRP_KSCHL sy-vline 
WA_VVN_TNAPR_WN_STR-PGNAM sy-vline 
WA_VVN_TNAPR_WN_STR-RONAM sy-vline 
WA_VVN_TNAPR_WN_STR-FONAM sy-vline 
WA_VVN_TNAPR_WN_STR-PGNAM2 sy-vline 
WA_VVN_TNAPR_WN_STR-RONAM2 sy-vline 
WA_VVN_TNAPR_WN_STR-FONAM2 sy-vline 
WA_VVN_TNAPR_WN_STR-PGNAM3 sy-vline 
WA_VVN_TNAPR_WN_STR-RONAM3 sy-vline 
WA_VVN_TNAPR_WN_STR-FONAM3 sy-vline 
WA_VVN_TNAPR_WN_STR-PGNAM4 sy-vline 
WA_VVN_TNAPR_WN_STR-RONAM4 sy-vline 
WA_VVN_TNAPR_WN_STR-FONAM4 sy-vline 
WA_VVN_TNAPR_WN_STR-PGNAM5 sy-vline 
WA_VVN_TNAPR_WN_STR-RONAM5 sy-vline 
WA_VVN_TNAPR_WN_STR-FONAM5 sy-vline 
WA_VVN_TNAPR_WN_STR-FUNCNAME sy-vline 
WA_VVN_TNAPR_WN_STR-SFORM sy-vline 
WA_VVN_TNAPR_WN_STR-FORMTYPE sy-vline 
WA_VVN_TNAPR_WN_STR-SFORM2 sy-vline 
WA_VVN_TNAPR_WN_STR-FORMTYPE2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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