ABAP Select data from SAP table TKEAN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TKEAN
*  INTO TABLE @DATA(IT_TKEAN2).
*--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_TKEAN INDEX 1 INTO DATA(WA_TKEAN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TKEAN>-MANDT = 1.
<TKEAN>-ERKRS = 1.
<TKEAN>-MERKMAL = 1.
<TKEAN>-NUMMER = 1.
<TKEAN>-TABNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TKEAN-FIELDNAME, sy-vline,
  WA_TKEAN-OFFSET, sy-vline,
  WA_TKEAN-LENG, sy-vline,
  WA_TKEAN-KEY1, sy-vline,
  WA_TKEAN-KEY2, sy-vline,
  WA_TKEAN-KEY3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TKEAN 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_TKEAN 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_TKEAN INTO WA_TKEAN.


*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_TKEAN_STR, 
MANDT TYPE STRING,
ERKRS TYPE STRING,
MERKMAL TYPE STRING,
NUMMER TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
OFFSET TYPE STRING,
LENG TYPE STRING,
KEY1 TYPE STRING,
KEY2 TYPE STRING,
KEY3 TYPE STRING,
KEY4 TYPE STRING,
KEY5 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TKEAN_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_TKEAN_STR-MANDT sy-vline 
WA_TKEAN_STR-ERKRS sy-vline 
WA_TKEAN_STR-MERKMAL sy-vline 
WA_TKEAN_STR-NUMMER sy-vline 
WA_TKEAN_STR-TABNAME sy-vline 
WA_TKEAN_STR-FIELDNAME sy-vline 
WA_TKEAN_STR-OFFSET sy-vline 
WA_TKEAN_STR-LENG sy-vline 
WA_TKEAN_STR-KEY1 sy-vline 
WA_TKEAN_STR-KEY2 sy-vline 
WA_TKEAN_STR-KEY3 sy-vline 
WA_TKEAN_STR-KEY4 sy-vline 
WA_TKEAN_STR-KEY5 sy-vline      INTO ld_text SEPARATED BY SPACE.

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