ABAP Select data from SAP table TKE_DATABUFFER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TKE_DATABUFFER
*  INTO TABLE @DATA(IT_TKE_DATABUFFER2).
*--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_TKE_DATABUFFER INDEX 1 INTO DATA(WA_TKE_DATABUFFER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TKE_DATABUFFER>-DATA1 = 1.
<TKE_DATABUFFER>-DATA2 = 1.
<TKE_DATABUFFER>-DATA3 = 1.
<TKE_DATABUFFER>-DATA4 = 1.
<TKE_DATABUFFER>-DATA5 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TKE_DATABUFFER-DATA6, sy-vline,
  WA_TKE_DATABUFFER-DATA7, sy-vline,
  WA_TKE_DATABUFFER-DATA8, sy-vline,
  WA_TKE_DATABUFFER-DATA9, sy-vline,
  WA_TKE_DATABUFFER-DATA10, sy-vline,
  WA_TKE_DATABUFFER-DATA11, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TKE_DATABUFFER 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_TKE_DATABUFFER 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_TKE_DATABUFFER INTO WA_TKE_DATABUFFER.


*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_TKE_DATABUFFER_STR, 
DATA1 TYPE STRING,
DATA2 TYPE STRING,
DATA3 TYPE STRING,
DATA4 TYPE STRING,
DATA5 TYPE STRING,
DATA6 TYPE STRING,
DATA7 TYPE STRING,
DATA8 TYPE STRING,
DATA9 TYPE STRING,
DATA10 TYPE STRING,
DATA11 TYPE STRING,
DATA12 TYPE STRING,
DATA13 TYPE STRING,
DATA14 TYPE STRING,
DATA15 TYPE STRING,
DATA16 TYPE STRING,
DATA17 TYPE STRING,
DATA18 TYPE STRING,
DATA19 TYPE STRING,
DATAI1 TYPE STRING,
DATAN1 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TKE_DATABUFFER_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_TKE_DATABUFFER_STR-DATA1 sy-vline 
WA_TKE_DATABUFFER_STR-DATA2 sy-vline 
WA_TKE_DATABUFFER_STR-DATA3 sy-vline 
WA_TKE_DATABUFFER_STR-DATA4 sy-vline 
WA_TKE_DATABUFFER_STR-DATA5 sy-vline 
WA_TKE_DATABUFFER_STR-DATA6 sy-vline 
WA_TKE_DATABUFFER_STR-DATA7 sy-vline 
WA_TKE_DATABUFFER_STR-DATA8 sy-vline 
WA_TKE_DATABUFFER_STR-DATA9 sy-vline 
WA_TKE_DATABUFFER_STR-DATA10 sy-vline 
WA_TKE_DATABUFFER_STR-DATA11 sy-vline 
WA_TKE_DATABUFFER_STR-DATA12 sy-vline 
WA_TKE_DATABUFFER_STR-DATA13 sy-vline 
WA_TKE_DATABUFFER_STR-DATA14 sy-vline 
WA_TKE_DATABUFFER_STR-DATA15 sy-vline 
WA_TKE_DATABUFFER_STR-DATA16 sy-vline 
WA_TKE_DATABUFFER_STR-DATA17 sy-vline 
WA_TKE_DATABUFFER_STR-DATA18 sy-vline 
WA_TKE_DATABUFFER_STR-DATA19 sy-vline 
WA_TKE_DATABUFFER_STR-DATAI1 sy-vline 
WA_TKE_DATABUFFER_STR-DATAN1 sy-vline      INTO ld_text SEPARATED BY SPACE.

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