ABAP Select data from SAP table PTK21 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PTK21 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 PTK21. 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 PTK21 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_PTK21 TYPE STANDARD TABLE OF PTK21,
      WA_PTK21 TYPE PTK21,
      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: <PTK21> TYPE PTK21.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PTK21.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PTK21
  INTO TABLE IT_PTK21.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PTK21
*  INTO TABLE @DATA(IT_PTK212).
*--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_PTK21 INDEX 1 INTO DATA(WA_PTK212).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PTK21 ASSIGNING <PTK21>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PTK21>-KMKEY = 1.
<PTK21>-ZIKEY = 1.
<PTK21>-DATUM = 1.
<PTK21>-KZPMF = 1.
<PTK21>-KZNZA = 1.

ENDLOOP.

LOOP AT IT_PTK21 INTO WA_PTK21.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PTK21-WAERS, sy-vline,
  WA_PTK21-BETFZ, sy-vline,
  WA_PTK21-BETFA, sy-vline,
  WA_PTK21-BETKU, sy-vline,
  WA_PTK21-ANZHL, sy-vline,
  WA_PTK21-GBTFZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PTK21 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_PTK21 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_PTK21 INTO WA_PTK21.


*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_PTK21_STR, 
KMKEY TYPE STRING,
ZIKEY TYPE STRING,
DATUM TYPE STRING,
KZPMF TYPE STRING,
KZNZA TYPE STRING,
WAERS TYPE STRING,
BETFZ TYPE STRING,
BETFA TYPE STRING,
BETKU TYPE STRING,
ANZHL TYPE STRING,
GBTFZ TYPE STRING,
GBTFA TYPE STRING,
GBTKU TYPE STRING,
V0TYP TYPE STRING,
V0ZNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PTK21_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_PTK21_STR-KMKEY sy-vline 
WA_PTK21_STR-ZIKEY sy-vline 
WA_PTK21_STR-DATUM sy-vline 
WA_PTK21_STR-KZPMF sy-vline 
WA_PTK21_STR-KZNZA sy-vline 
WA_PTK21_STR-WAERS sy-vline 
WA_PTK21_STR-BETFZ sy-vline 
WA_PTK21_STR-BETFA sy-vline 
WA_PTK21_STR-BETKU sy-vline 
WA_PTK21_STR-ANZHL sy-vline 
WA_PTK21_STR-GBTFZ sy-vline 
WA_PTK21_STR-GBTFA sy-vline 
WA_PTK21_STR-GBTKU sy-vline 
WA_PTK21_STR-V0TYP sy-vline 
WA_PTK21_STR-V0ZNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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