ABAP Select data from SAP table TNKAV into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TNKAV
*  INTO TABLE @DATA(IT_TNKAV2).
*--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_TNKAV INDEX 1 INTO DATA(WA_TNKAV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TNKAV>-MANDT = 1.
<TNKAV>-EINRI = 1.
<TNKAV>-ORGID = 1.
<TNKAV>-DOKART_KA = 1.
<TNKAV>-ORGFORM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TNKAV-ORGFORM_S, sy-vline,
  WA_TNKAV-ORGFORM_A, sy-vline,
  WA_TNKAV-ANLAGE_AUT, sy-vline,
  WA_TNKAV-ANLAGE_AUF, sy-vline,
  WA_TNKAV-ANLAGE_LI, sy-vline,
  WA_TNKAV-ENTLEI_ANL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TNKAV 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_TNKAV 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_TNKAV INTO WA_TNKAV.


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

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

*Conversion exit ALPHA, internal->external for field ARCHIV
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TNKAV-ARCHIV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TNKAV-ARCHIV.
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_TNKAV_STR, 
MANDT TYPE STRING,
EINRI TYPE STRING,
ORGID TYPE STRING,
DOKART_KA TYPE STRING,
ORGFORM TYPE STRING,
ORGFORM_S TYPE STRING,
ORGFORM_A TYPE STRING,
ANLAGE_AUT TYPE STRING,
ANLAGE_AUF TYPE STRING,
ANLAGE_LI TYPE STRING,
ENTLEI_ANL TYPE STRING,
ENTLEI_AUT TYPE STRING,
ANFORD_AUT TYPE STRING,
ENTLEI_LI TYPE STRING,
UEBERG_AUT TYPE STRING,
UEBERG_LI TYPE STRING,
ARCHIV TYPE STRING,
MDR_TMP TYPE STRING,
DOKAR_TMP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TNKAV_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_TNKAV_STR-MANDT sy-vline 
WA_TNKAV_STR-EINRI sy-vline 
WA_TNKAV_STR-ORGID sy-vline 
WA_TNKAV_STR-DOKART_KA sy-vline 
WA_TNKAV_STR-ORGFORM sy-vline 
WA_TNKAV_STR-ORGFORM_S sy-vline 
WA_TNKAV_STR-ORGFORM_A sy-vline 
WA_TNKAV_STR-ANLAGE_AUT sy-vline 
WA_TNKAV_STR-ANLAGE_AUF sy-vline 
WA_TNKAV_STR-ANLAGE_LI sy-vline 
WA_TNKAV_STR-ENTLEI_ANL sy-vline 
WA_TNKAV_STR-ENTLEI_AUT sy-vline 
WA_TNKAV_STR-ANFORD_AUT sy-vline 
WA_TNKAV_STR-ENTLEI_LI sy-vline 
WA_TNKAV_STR-UEBERG_AUT sy-vline 
WA_TNKAV_STR-UEBERG_LI sy-vline 
WA_TNKAV_STR-ARCHIV sy-vline 
WA_TNKAV_STR-MDR_TMP sy-vline 
WA_TNKAV_STR-DOKAR_TMP sy-vline      INTO ld_text SEPARATED BY SPACE.

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