ABAP Select data from SAP table TN02K into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TN02K 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 TN02K. 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 TN02K 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_TN02K TYPE STANDARD TABLE OF TN02K,
      WA_TN02K TYPE TN02K,
      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: <TN02K> TYPE TN02K.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TN02K.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TN02K
  INTO TABLE IT_TN02K.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TN02K
*  INTO TABLE @DATA(IT_TN02K2).
*--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_TN02K INDEX 1 INTO DATA(WA_TN02K2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TN02K ASSIGNING <TN02K>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TN02K>-APPLK = 1.
<TN02K>-EVENT = 1.
<TN02K>-SYSTYP = 1.
<TN02K>-SYSREL = 1.
<TN02K>-REMDB = 1.

ENDLOOP.

LOOP AT IT_TN02K INTO WA_TN02K.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TN02K-FUNAM, sy-vline,
  WA_TN02K-RFCFLG, sy-vline,
  WA_TN02K-CPICFLG, sy-vline,
  WA_TN02K-RODCFLG, sy-vline,
  WA_TN02K-TPROG, sy-vline,
  WA_TN02K-TFORM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TN02K 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_TN02K 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_TN02K INTO WA_TN02K.


*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 SYSTYP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN02K-SYSTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN02K-SYSTYP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SYSREL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN02K-SYSREL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN02K-SYSREL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CMAND
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TN02K-CMAND
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TN02K-CMAND.
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_TN02K_STR, 
APPLK TYPE STRING,
EVENT TYPE STRING,
SYSTYP TYPE STRING,
SYSREL TYPE STRING,
REMDB TYPE STRING,
FUNAM TYPE STRING,
RFCFLG TYPE STRING,
CPICFLG TYPE STRING,
RODCFLG TYPE STRING,
TPROG TYPE STRING,
TFORM TYPE STRING,
RFNAME TYPE STRING,
PROGR TYPE STRING,
FORMR TYPE STRING,
CMAND TYPE STRING,
CUSER TYPE STRING,
PASSW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TN02K_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_TN02K_STR-APPLK sy-vline 
WA_TN02K_STR-EVENT sy-vline 
WA_TN02K_STR-SYSTYP sy-vline 
WA_TN02K_STR-SYSREL sy-vline 
WA_TN02K_STR-REMDB sy-vline 
WA_TN02K_STR-FUNAM sy-vline 
WA_TN02K_STR-RFCFLG sy-vline 
WA_TN02K_STR-CPICFLG sy-vline 
WA_TN02K_STR-RODCFLG sy-vline 
WA_TN02K_STR-TPROG sy-vline 
WA_TN02K_STR-TFORM sy-vline 
WA_TN02K_STR-RFNAME sy-vline 
WA_TN02K_STR-PROGR sy-vline 
WA_TN02K_STR-FORMR sy-vline 
WA_TN02K_STR-CMAND sy-vline 
WA_TN02K_STR-CUSER sy-vline 
WA_TN02K_STR-PASSW sy-vline      INTO ld_text SEPARATED BY SPACE.

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