ABAP Select data from SAP table TKEVS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TKEVS
*  INTO TABLE @DATA(IT_TKEVS2).
*--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_TKEVS INDEX 1 INTO DATA(WA_TKEVS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TKEVS>-MANDT = 1.
<TKEVS>-VERSI = 1.
<TKEVS>-ERKRS = 1.
<TKEVS>-BEBUBA = 1.
<TKEVS>-BEPLBA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TKEVS-KURST, sy-vline,
  WA_TKEVS-ABLEDA, sy-vline,
  WA_TKEVS-ZERATR, sy-vline,
  WA_TKEVS-FCALID, sy-vline,
  WA_TKEVS-EFORM, sy-vline,
  WA_TKEVS-PSTRUKT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TKEVS 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_TKEVS 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_TKEVS INTO WA_TKEVS.


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

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

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

*Conversion exit LEDBO, internal->external for field PALEDGER
CALL FUNCTION 'CONVERSION_EXIT_LEDBO_OUTPUT'
  EXPORTING
    input =                      WA_TKEVS-PALEDGER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TKEVS-PALEDGER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ERSCH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TKEVS-ERSCH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TKEVS-ERSCH.
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_TKEVS_STR, 
MANDT TYPE STRING,
VERSI TYPE STRING,
ERKRS TYPE STRING,
BEBUBA TYPE STRING,
BEPLBA TYPE STRING,
KURST TYPE STRING,
ABLEDA TYPE STRING,
ZERATR TYPE STRING,
FCALID TYPE STRING,
EFORM TYPE STRING,
PSTRUKT TYPE STRING,
VSTYP TYPE STRING,
PALEDGER TYPE STRING,
ABLVPR TYPE STRING,
CURTP TYPE STRING,
ERSCH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TKEVS_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_TKEVS_STR-MANDT sy-vline 
WA_TKEVS_STR-VERSI sy-vline 
WA_TKEVS_STR-ERKRS sy-vline 
WA_TKEVS_STR-BEBUBA sy-vline 
WA_TKEVS_STR-BEPLBA sy-vline 
WA_TKEVS_STR-KURST sy-vline 
WA_TKEVS_STR-ABLEDA sy-vline 
WA_TKEVS_STR-ZERATR sy-vline 
WA_TKEVS_STR-FCALID sy-vline 
WA_TKEVS_STR-EFORM sy-vline 
WA_TKEVS_STR-PSTRUKT sy-vline 
WA_TKEVS_STR-VSTYP sy-vline 
WA_TKEVS_STR-PALEDGER sy-vline 
WA_TKEVS_STR-ABLVPR sy-vline 
WA_TKEVS_STR-CURTP sy-vline 
WA_TKEVS_STR-ERSCH sy-vline      INTO ld_text SEPARATED BY SPACE.

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