ABAP Select data from SAP table PAY_PERIOD_KEY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PAY_PERIOD_KEY
*  INTO TABLE @DATA(IT_PAY_PERIOD_KEY2).
*--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_PAY_PERIOD_KEY INDEX 1 INTO DATA(WA_PAY_PERIOD_KEY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PAY_PERIOD_KEY>-ABKRS = 1.
<PAY_PERIOD_KEY>-FPPER = 1.
<PAY_PERIOD_KEY>-PABRJ = 1.
<PAY_PERIOD_KEY>-PABRP = 1.
<PAY_PERIOD_KEY>-FPBEG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PAY_PERIOD_KEY-FPEND, sy-vline,
  WA_PAY_PERIOD_KEY-PAYTY, sy-vline,
  WA_PAY_PERIOD_KEY-PAYID, sy-vline,
  WA_PAY_PERIOD_KEY-OCRSN, sy-vline,
  WA_PAY_PERIOD_KEY-IABKRS, sy-vline,
  WA_PAY_PERIOD_KEY-INPER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PAY_PERIOD_KEY 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_PAY_PERIOD_KEY 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_PAY_PERIOD_KEY INTO WA_PAY_PERIOD_KEY.


*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.

*Conversion exit GJAHR, internal->external for field PABRJ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_PAY_PERIOD_KEY-PABRJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PAY_PERIOD_KEY-PABRJ.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field PABRJ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_PAY_PERIOD_KEY-PABRJ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PAY_PERIOD_KEY-PABRJ.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_PAY_PERIOD_KEY_STR, 
ABKRS TYPE STRING,
FPPER TYPE STRING,
PABRJ TYPE STRING,
PABRP TYPE STRING,
FPBEG TYPE STRING,
FPEND TYPE STRING,
PAYTY TYPE STRING,
PAYID TYPE STRING,
OCRSN TYPE STRING,
IABKRS TYPE STRING,
INPER TYPE STRING,
PABRJ TYPE STRING,
PABRP TYPE STRING,
IPEND TYPE STRING,
INPTY TYPE STRING,
INPID TYPE STRING,
INOCR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PAY_PERIOD_KEY_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_PAY_PERIOD_KEY_STR-ABKRS sy-vline 
WA_PAY_PERIOD_KEY_STR-FPPER sy-vline 
WA_PAY_PERIOD_KEY_STR-PABRJ sy-vline 
WA_PAY_PERIOD_KEY_STR-PABRP sy-vline 
WA_PAY_PERIOD_KEY_STR-FPBEG sy-vline 
WA_PAY_PERIOD_KEY_STR-FPEND sy-vline 
WA_PAY_PERIOD_KEY_STR-PAYTY sy-vline 
WA_PAY_PERIOD_KEY_STR-PAYID sy-vline 
WA_PAY_PERIOD_KEY_STR-OCRSN sy-vline 
WA_PAY_PERIOD_KEY_STR-IABKRS sy-vline 
WA_PAY_PERIOD_KEY_STR-INPER sy-vline 
WA_PAY_PERIOD_KEY_STR-PABRJ sy-vline 
WA_PAY_PERIOD_KEY_STR-PABRP sy-vline 
WA_PAY_PERIOD_KEY_STR-IPEND sy-vline 
WA_PAY_PERIOD_KEY_STR-INPTY sy-vline 
WA_PAY_PERIOD_KEY_STR-INPID sy-vline 
WA_PAY_PERIOD_KEY_STR-INOCR sy-vline      INTO ld_text SEPARATED BY SPACE.

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