ABAP Select data from SAP table VN2ET2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP VN2ET2 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 VN2ET2. 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 VN2ET2 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_VN2ET2 TYPE STANDARD TABLE OF VN2ET2,
      WA_VN2ET2 TYPE VN2ET2,
      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: <VN2ET2> TYPE VN2ET2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_VN2ET2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM VN2ET2
  INTO TABLE IT_VN2ET2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VN2ET2
*  INTO TABLE @DATA(IT_VN2ET22).
*--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_VN2ET2 INDEX 1 INTO DATA(WA_VN2ET22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_VN2ET2 ASSIGNING <VN2ET2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VN2ET2>-MANDT = 1.
<VN2ET2>-EINRI = 1.
<VN2ET2>-DTID = 1.
<VN2ET2>-DTVERS = 1.
<VN2ET2>-ETID = 1.

ENDLOOP.

LOOP AT IT_VN2ET2 INTO WA_VN2ET2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VN2ET2-GUID, sy-vline,
  WA_VN2ET2-FD_EINRI, sy-vline,
  WA_VN2ET2-FD_DTID, sy-vline,
  WA_VN2ET2-FD_DTVERS, sy-vline,
  WA_VN2ET2-FD_SELCRIT, sy-vline,
  WA_VN2ET2-FD_SAME_PAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VN2ET2 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_VN2ET2 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_VN2ET2 INTO WA_VN2ET2.


*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_VN2ET2-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN2ET2-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FD_EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VN2ET2-FD_EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VN2ET2-FD_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_VN2ET2_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
DTID TYPE STRING,
DTVERS TYPE STRING,
ETID TYPE STRING,
GUID TYPE STRING,
FD_EINRI TYPE STRING,
FD_DTID TYPE STRING,
FD_DTVERS TYPE STRING,
FD_SELCRIT TYPE STRING,
FD_SAME_PAT TYPE STRING,
FD_SAME_FAL TYPE STRING,
FD_SAME_BEW TYPE STRING,
FD_SAME_LEI TYPE STRING,
FD_DO_VORB TYPE STRING,
FD_ETID_SUPER TYPE STRING,
GROUPING TYPE STRING,
P2LINETYPE TYPE STRING,
P2TABLTYPE TYPE STRING,
P2KOMPTYPE TYPE STRING,
P2TYPERUMP TYPE STRING,
P2UEXCV_ACT TYPE STRING,
P2UEXF4_ACT TYPE STRING,
P2UEXMOD_ACT TYPE STRING,
P2UEXSUP_ACT TYPE STRING,
P2UEXCMD_ACT TYPE STRING,
P2UEXCTM_ACT TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VN2ET2_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_VN2ET2_STR-MANDT sy-vline 
WA_VN2ET2_STR-EINRI sy-vline 
WA_VN2ET2_STR-DTID sy-vline 
WA_VN2ET2_STR-DTVERS sy-vline 
WA_VN2ET2_STR-ETID sy-vline 
WA_VN2ET2_STR-GUID sy-vline 
WA_VN2ET2_STR-FD_EINRI sy-vline 
WA_VN2ET2_STR-FD_DTID sy-vline 
WA_VN2ET2_STR-FD_DTVERS sy-vline 
WA_VN2ET2_STR-FD_SELCRIT sy-vline 
WA_VN2ET2_STR-FD_SAME_PAT sy-vline 
WA_VN2ET2_STR-FD_SAME_FAL sy-vline 
WA_VN2ET2_STR-FD_SAME_BEW sy-vline 
WA_VN2ET2_STR-FD_SAME_LEI sy-vline 
WA_VN2ET2_STR-FD_DO_VORB sy-vline 
WA_VN2ET2_STR-FD_ETID_SUPER sy-vline 
WA_VN2ET2_STR-GROUPING sy-vline 
WA_VN2ET2_STR-P2LINETYPE sy-vline 
WA_VN2ET2_STR-P2TABLTYPE sy-vline 
WA_VN2ET2_STR-P2KOMPTYPE sy-vline 
WA_VN2ET2_STR-P2TYPERUMP sy-vline 
WA_VN2ET2_STR-P2UEXCV_ACT sy-vline 
WA_VN2ET2_STR-P2UEXF4_ACT sy-vline 
WA_VN2ET2_STR-P2UEXMOD_ACT sy-vline 
WA_VN2ET2_STR-P2UEXSUP_ACT sy-vline 
WA_VN2ET2_STR-P2UEXCMD_ACT sy-vline 
WA_VN2ET2_STR-P2UEXCTM_ACT sy-vline 
WA_VN2ET2_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.