ABAP Select data from SAP table V_T5NKI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_T5NKI 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_T5NKI. 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_T5NKI 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_T5NKI TYPE STANDARD TABLE OF V_T5NKI,
      WA_V_T5NKI TYPE V_T5NKI,
      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_T5NKI> TYPE V_T5NKI.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_T5NKI.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_T5NKI
  INTO TABLE IT_V_T5NKI.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_T5NKI
*  INTO TABLE @DATA(IT_V_T5NKI2).
*--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_T5NKI INDEX 1 INTO DATA(WA_V_T5NKI2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_T5NKI ASSIGNING <V_T5NKI>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_T5NKI>-MANDT = 1.
<V_T5NKI>-TRSETTYPE = 1.
<V_T5NKI>-TRSET = 1.
<V_T5NKI>-TRSETTYPEP = 1.
<V_T5NKI>-TRSETTXT = 1.

ENDLOOP.

LOOP AT IT_V_T5NKI INTO WA_V_T5NKI.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_T5NKI-TRSETTTXT, sy-vline,
  WA_V_T5NKI-TRSETTPTXT, sy-vline,
  WA_V_T5NKI-TRSETPVAL, sy-vline,
  WA_V_T5NKI-UNAME, sy-vline,
  WA_V_T5NKI-AEDTM, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_V_T5NKI 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_T5NKI 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_T5NKI INTO WA_V_T5NKI.


*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_V_T5NKI_STR, 
MANDT TYPE STRING,
TRSETTYPE TYPE STRING,
TRSET TYPE STRING,
TRSETTYPEP TYPE STRING,
TRSETTXT TYPE STRING,
TRSETTTXT TYPE STRING,
TRSETTPTXT TYPE STRING,
TRSETPVAL TYPE STRING,
UNAME TYPE STRING,
AEDTM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_T5NKI_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_T5NKI_STR-MANDT sy-vline 
WA_V_T5NKI_STR-TRSETTYPE sy-vline 
WA_V_T5NKI_STR-TRSET sy-vline 
WA_V_T5NKI_STR-TRSETTYPEP sy-vline 
WA_V_T5NKI_STR-TRSETTXT sy-vline 
WA_V_T5NKI_STR-TRSETTTXT sy-vline 
WA_V_T5NKI_STR-TRSETTPTXT sy-vline 
WA_V_T5NKI_STR-TRSETPVAL sy-vline 
WA_V_T5NKI_STR-UNAME sy-vline 
WA_V_T5NKI_STR-AEDTM sy-vline      INTO ld_text SEPARATED BY SPACE.

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