ABAP Select data from SAP table T5NKA into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T5NKA 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 T5NKA. 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 T5NKA 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_T5NKA TYPE STANDARD TABLE OF T5NKA,
      WA_T5NKA TYPE T5NKA,
      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: <T5NKA> TYPE T5NKA.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T5NKA.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T5NKA
  INTO TABLE IT_T5NKA.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T5NKA
*  INTO TABLE @DATA(IT_T5NKA2).
*--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_T5NKA INDEX 1 INTO DATA(WA_T5NKA2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T5NKA ASSIGNING <T5NKA>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T5NKA>-MANDT = 1.
<T5NKA>-TRSET = 1.
<T5NKA>-RTTAB = 1.
<T5NKA>-ROWNR = 1.
<T5NKA>-COLNR = 1.

ENDLOOP.

LOOP AT IT_T5NKA INTO WA_T5NKA.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T5NKA-VAL01, sy-vline,
  WA_T5NKA-VAL02, sy-vline,
  WA_T5NKA-VAL03, sy-vline,
  WA_T5NKA-VAL04, sy-vline,
  WA_T5NKA-VAL05, sy-vline,
  WA_T5NKA-VAL06, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T5NKA 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_T5NKA 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_T5NKA INTO WA_T5NKA.


*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_T5NKA_STR, 
MANDT TYPE STRING,
TRSET TYPE STRING,
RTTAB TYPE STRING,
ROWNR TYPE STRING,
COLNR TYPE STRING,
VAL01 TYPE STRING,
VAL02 TYPE STRING,
VAL03 TYPE STRING,
VAL04 TYPE STRING,
VAL05 TYPE STRING,
VAL06 TYPE STRING,
VAL07 TYPE STRING,
VAL08 TYPE STRING,
VAL09 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T5NKA_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_T5NKA_STR-MANDT sy-vline 
WA_T5NKA_STR-TRSET sy-vline 
WA_T5NKA_STR-RTTAB sy-vline 
WA_T5NKA_STR-ROWNR sy-vline 
WA_T5NKA_STR-COLNR sy-vline 
WA_T5NKA_STR-VAL01 sy-vline 
WA_T5NKA_STR-VAL02 sy-vline 
WA_T5NKA_STR-VAL03 sy-vline 
WA_T5NKA_STR-VAL04 sy-vline 
WA_T5NKA_STR-VAL05 sy-vline 
WA_T5NKA_STR-VAL06 sy-vline 
WA_T5NKA_STR-VAL07 sy-vline 
WA_T5NKA_STR-VAL08 sy-vline 
WA_T5NKA_STR-VAL09 sy-vline      INTO ld_text SEPARATED BY SPACE.

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