ABAP Select data from SAP table TKCQ into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TKCQ
*  INTO TABLE @DATA(IT_TKCQ2).
*--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_TKCQ INDEX 1 INTO DATA(WA_TKCQ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TKCQ>-FIENM = 1.
<TKCQ>-POSIT = 1.
<TKCQ>-ATTRI = 1.
<TKCQ>-ROLNM = 1.
<TKCQ>-ATRTP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TKCQ-DIMFL, sy-vline,
  WA_TKCQ-NDTEL, sy-vline,
  WA_TKCQ-NFINM, sy-vline,
  WA_TKCQ-TRANS, sy-vline,
  WA_TKCQ-PHYTB, sy-vline,
  WA_TKCQ-ORFIE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TKCQ 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_TKCQ 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_TKCQ INTO WA_TKCQ.


*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_TKCQ_STR, 
FIENM TYPE STRING,
POSIT TYPE STRING,
ATTRI TYPE STRING,
ROLNM TYPE STRING,
ATRTP TYPE STRING,
DIMFL TYPE STRING,
NDTEL TYPE STRING,
NFINM TYPE STRING,
TRANS TYPE STRING,
PHYTB TYPE STRING,
ORFIE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TKCQ_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_TKCQ_STR-FIENM sy-vline 
WA_TKCQ_STR-POSIT sy-vline 
WA_TKCQ_STR-ATTRI sy-vline 
WA_TKCQ_STR-ROLNM sy-vline 
WA_TKCQ_STR-ATRTP sy-vline 
WA_TKCQ_STR-DIMFL sy-vline 
WA_TKCQ_STR-NDTEL sy-vline 
WA_TKCQ_STR-NFINM sy-vline 
WA_TKCQ_STR-TRANS sy-vline 
WA_TKCQ_STR-PHYTB sy-vline 
WA_TKCQ_STR-ORFIE sy-vline      INTO ld_text SEPARATED BY SPACE.

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