ABAP Select data from SAP table VNNAU 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 VNNAU 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 VNNAU. 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 VNNAU 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_VNNAU TYPE STANDARD TABLE OF VNNAU,
      WA_VNNAU TYPE VNNAU,
      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: <VNNAU> TYPE VNNAU.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNNAU
*  INTO TABLE @DATA(IT_VNNAU2).
*--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_VNNAU INDEX 1 INTO DATA(WA_VNNAU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNNAU>-MANDT = 1.
<VNNAU>-EINRI = 1.
<VNNAU>-AUTNR = 1.
<VNNAU>-FALNR = 1.
<VNNAU>-FALAR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNNAU-KOSTR, sy-vline,
  WA_VNNAU-PATNR, sy-vline,
  WA_VNNAU-PERNR, sy-vline,
  WA_VNNAU-LFDNR, sy-vline,
  WA_VNNAU-DITXT, sy-vline,
  WA_VNNAU-DKAT_REF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNNAU 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_VNNAU 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_VNNAU INTO WA_VNNAU.


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

*Conversion exit ALPHA, internal->external for field AUTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNNAU-AUTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNNAU-AUTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNNAU-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNNAU-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNNAU-KOSTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNNAU-KOSTR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNNAU-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNNAU-PATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PERNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNNAU-PERNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNNAU-PERNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GRANR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNNAU-GRANR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNNAU-GRANR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LNRLS_ACT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNNAU-LNRLS_ACT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNNAU-LNRLS_ACT.
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_VNNAU_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
AUTNR TYPE STRING,
FALNR TYPE STRING,
FALAR TYPE STRING,
KOSTR TYPE STRING,
PATNR TYPE STRING,
PERNR TYPE STRING,
LFDNR TYPE STRING,
DITXT TYPE STRING,
DKAT_REF TYPE STRING,
DKEY_REF TYPE STRING,
AUTST TYPE STRING,
DATAU TYPE STRING,
GRANR TYPE STRING,
DATGR TYPE STRING,
DATST TYPE STRING,
DATEN TYPE STRING,
AUTXT TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
DBCNR TYPE STRING,
LNRLS_ACT TYPE STRING,
AUT_TEXT TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNNAU_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_VNNAU_STR-MANDT sy-vline 
WA_VNNAU_STR-EINRI sy-vline 
WA_VNNAU_STR-AUTNR sy-vline 
WA_VNNAU_STR-FALNR sy-vline 
WA_VNNAU_STR-FALAR sy-vline 
WA_VNNAU_STR-KOSTR sy-vline 
WA_VNNAU_STR-PATNR sy-vline 
WA_VNNAU_STR-PERNR sy-vline 
WA_VNNAU_STR-LFDNR sy-vline 
WA_VNNAU_STR-DITXT sy-vline 
WA_VNNAU_STR-DKAT_REF sy-vline 
WA_VNNAU_STR-DKEY_REF sy-vline 
WA_VNNAU_STR-AUTST sy-vline 
WA_VNNAU_STR-DATAU sy-vline 
WA_VNNAU_STR-GRANR sy-vline 
WA_VNNAU_STR-DATGR sy-vline 
WA_VNNAU_STR-DATST sy-vline 
WA_VNNAU_STR-DATEN sy-vline 
WA_VNNAU_STR-AUTXT sy-vline 
WA_VNNAU_STR-UPDAT sy-vline 
WA_VNNAU_STR-UPUSR sy-vline 
WA_VNNAU_STR-DBCNR sy-vline 
WA_VNNAU_STR-LNRLS_ACT sy-vline 
WA_VNNAU_STR-AUT_TEXT sy-vline 
WA_VNNAU_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.