ABAP Select data from SAP table TKCK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TKCK
*  INTO TABLE @DATA(IT_TKCK2).
*--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_TKCK INDEX 1 INTO DATA(WA_TKCK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TKCK>-APPLC = 1.
<TKCK>-KEYRA = 1.
<TKCK>-ROLNM = 1.
<TKCK>-SBGRP = 1.
<TKCK>-AGGDI = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TKCK-AGGTM, sy-vline,
  WA_TKCK-AGGFI, sy-vline,
  WA_TKCK-OPORD, sy-vline,
  WA_TKCK-PRDEC, sy-vline,
  WA_TKCK-PRSNT, sy-vline,
  WA_TKCK-CCNUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TKCK 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_TKCK 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_TKCK INTO WA_TKCK.


*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_TKCK_STR, 
APPLC TYPE STRING,
KEYRA TYPE STRING,
ROLNM TYPE STRING,
SBGRP TYPE STRING,
AGGDI TYPE STRING,
AGGTM TYPE STRING,
AGGFI TYPE STRING,
OPORD TYPE STRING,
PRDEC TYPE STRING,
PRSNT TYPE STRING,
CCNUM TYPE STRING,
DCURR TYPE STRING,
CHNAM TYPE STRING,
CHDAT TYPE STRING,
CHTIM TYPE STRING,
TFLAG TYPE STRING,
RCSIN TYPE STRING,
RSLIN TYPE STRING,
BASFL TYPE STRING,
COBJID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TKCK_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_TKCK_STR-APPLC sy-vline 
WA_TKCK_STR-KEYRA sy-vline 
WA_TKCK_STR-ROLNM sy-vline 
WA_TKCK_STR-SBGRP sy-vline 
WA_TKCK_STR-AGGDI sy-vline 
WA_TKCK_STR-AGGTM sy-vline 
WA_TKCK_STR-AGGFI sy-vline 
WA_TKCK_STR-OPORD sy-vline 
WA_TKCK_STR-PRDEC sy-vline 
WA_TKCK_STR-PRSNT sy-vline 
WA_TKCK_STR-CCNUM sy-vline 
WA_TKCK_STR-DCURR sy-vline 
WA_TKCK_STR-CHNAM sy-vline 
WA_TKCK_STR-CHDAT sy-vline 
WA_TKCK_STR-CHTIM sy-vline 
WA_TKCK_STR-TFLAG sy-vline 
WA_TKCK_STR-RCSIN sy-vline 
WA_TKCK_STR-RSLIN sy-vline 
WA_TKCK_STR-BASFL sy-vline 
WA_TKCK_STR-COBJID sy-vline      INTO ld_text SEPARATED BY SPACE.

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