ABAP Select data from SAP table V_OI0_TVAK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_OI0_TVAK 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 V_OI0_TVAK. 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 V_OI0_TVAK 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_V_OI0_TVAK TYPE STANDARD TABLE OF V_OI0_TVAK,
      WA_V_OI0_TVAK TYPE V_OI0_TVAK,
      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: <V_OI0_TVAK> TYPE V_OI0_TVAK.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_OI0_TVAK.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_OI0_TVAK
  INTO TABLE IT_V_OI0_TVAK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_OI0_TVAK
*  INTO TABLE @DATA(IT_V_OI0_TVAK2).
*--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_V_OI0_TVAK INDEX 1 INTO DATA(WA_V_OI0_TVAK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_OI0_TVAK ASSIGNING <V_OI0_TVAK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_OI0_TVAK>-MANDT = 1.
<V_OI0_TVAK>-AUART = 1.
<V_OI0_TVAK>-BEZEI = 1.
<V_OI0_TVAK>-TRVOG = 1.
<V_OI0_TVAK>-VBTYP = 1.

ENDLOOP.

LOOP AT IT_V_OI0_TVAK INTO WA_V_OI0_TVAK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_OI0_TVAK-PARGR, sy-vline,
  WA_V_OI0_TVAK-KOPGR, sy-vline,
  WA_V_OI0_TVAK-SPERR, sy-vline,
  WA_V_OI0_TVAK-VBKLT, sy-vline,
  WA_V_OI0_TVAK-OIPIPEVAL, sy-vline,
  WA_V_OI0_TVAK-OIISOILPD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_OI0_TVAK 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_V_OI0_TVAK 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_V_OI0_TVAK INTO WA_V_OI0_TVAK.


*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 AUART, internal->external for field AUART
CALL FUNCTION 'CONVERSION_EXIT_AUART_OUTPUT'
  EXPORTING
    input =                      WA_V_OI0_TVAK-AUART
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OI0_TVAK-AUART.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field OIPARVW1
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_V_OI0_TVAK-OIPARVW1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OI0_TVAK-OIPARVW1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field OIPARVW2
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_V_OI0_TVAK-OIPARVW2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OI0_TVAK-OIPARVW2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field OIPARVW3
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_V_OI0_TVAK-OIPARVW3
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OI0_TVAK-OIPARVW3.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field OIPARVW4
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_V_OI0_TVAK-OIPARVW4
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OI0_TVAK-OIPARVW4.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field OIPARVW5
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_V_OI0_TVAK-OIPARVW5
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OI0_TVAK-OIPARVW5.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field OIPARVW6
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_V_OI0_TVAK-OIPARVW6
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OI0_TVAK-OIPARVW6.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field OIPARVW7
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_V_OI0_TVAK-OIPARVW7
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OI0_TVAK-OIPARVW7.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field OIPARVW8
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_V_OI0_TVAK-OIPARVW8
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OI0_TVAK-OIPARVW8.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field OIPARVW9
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_V_OI0_TVAK-OIPARVW9
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_OI0_TVAK-OIPARVW9.
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_V_OI0_TVAK_STR, 
MANDT TYPE STRING,
AUART TYPE STRING,
BEZEI TYPE STRING,
TRVOG TYPE STRING,
VBTYP TYPE STRING,
PARGR TYPE STRING,
KOPGR TYPE STRING,
SPERR TYPE STRING,
VBKLT TYPE STRING,
OIPIPEVAL TYPE STRING,
OIISOILPD TYPE STRING,
OICSEGI TYPE STRING,
OICFKARTDI TYPE STRING,
OIPARVW1 TYPE STRING,
OIPARVW2 TYPE STRING,
OIPARVW3 TYPE STRING,
OIPARVW4 TYPE STRING,
OIPARVW5 TYPE STRING,
OIPARVW6 TYPE STRING,
OIPARVW7 TYPE STRING,
OIPARVW8 TYPE STRING,
OIPARVW9 TYPE STRING,
OISUBHEAD TYPE STRING,
OISUBITEM TYPE STRING,
OIUSEREXIT TYPE STRING,
OIU_FKARA TYPE STRING,
UEVOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_OI0_TVAK_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_V_OI0_TVAK_STR-MANDT sy-vline 
WA_V_OI0_TVAK_STR-AUART sy-vline 
WA_V_OI0_TVAK_STR-BEZEI sy-vline 
WA_V_OI0_TVAK_STR-TRVOG sy-vline 
WA_V_OI0_TVAK_STR-VBTYP sy-vline 
WA_V_OI0_TVAK_STR-PARGR sy-vline 
WA_V_OI0_TVAK_STR-KOPGR sy-vline 
WA_V_OI0_TVAK_STR-SPERR sy-vline 
WA_V_OI0_TVAK_STR-VBKLT sy-vline 
WA_V_OI0_TVAK_STR-OIPIPEVAL sy-vline 
WA_V_OI0_TVAK_STR-OIISOILPD sy-vline 
WA_V_OI0_TVAK_STR-OICSEGI sy-vline 
WA_V_OI0_TVAK_STR-OICFKARTDI sy-vline 
WA_V_OI0_TVAK_STR-OIPARVW1 sy-vline 
WA_V_OI0_TVAK_STR-OIPARVW2 sy-vline 
WA_V_OI0_TVAK_STR-OIPARVW3 sy-vline 
WA_V_OI0_TVAK_STR-OIPARVW4 sy-vline 
WA_V_OI0_TVAK_STR-OIPARVW5 sy-vline 
WA_V_OI0_TVAK_STR-OIPARVW6 sy-vline 
WA_V_OI0_TVAK_STR-OIPARVW7 sy-vline 
WA_V_OI0_TVAK_STR-OIPARVW8 sy-vline 
WA_V_OI0_TVAK_STR-OIPARVW9 sy-vline 
WA_V_OI0_TVAK_STR-OISUBHEAD sy-vline 
WA_V_OI0_TVAK_STR-OISUBITEM sy-vline 
WA_V_OI0_TVAK_STR-OIUSEREXIT sy-vline 
WA_V_OI0_TVAK_STR-OIU_FKARA sy-vline 
WA_V_OI0_TVAK_STR-UEVOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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