ABAP Select data from SAP table PISTOCK_ID_FIELDS_WITH_PERIOD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PISTOCK_ID_FIELDS_WITH_PERIOD
*  INTO TABLE @DATA(IT_PISTOCK_ID_FIELDS_WITH_PERIOD2).
*--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_PISTOCK_ID_FIELDS_WITH_PERIOD INDEX 1 INTO DATA(WA_PISTOCK_ID_FIELDS_WITH_PERIOD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PISTOCK_ID_FIELDS_WITH_PERIOD>-MATERIAL = 1.
<PISTOCK_ID_FIELDS_WITH_PERIOD>-PLANT = 1.
<PISTOCK_ID_FIELDS_WITH_PERIOD>-STORAGELOCATION = 1.
<PISTOCK_ID_FIELDS_WITH_PERIOD>-BATCH = 1.
<PISTOCK_ID_FIELDS_WITH_PERIOD>-SUPPLIER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PISTOCK_ID_FIELDS_WITH_PERIOD-SALESORDER, sy-vline,
  WA_PISTOCK_ID_FIELDS_WITH_PERIOD-SALESORDERITEM, sy-vline,
  WA_PISTOCK_ID_FIELDS_WITH_PERIOD-WBSELEMENTINTERNALID, sy-vline,
  WA_PISTOCK_ID_FIELDS_WITH_PERIOD-CUSTOMER, sy-vline,
  WA_PISTOCK_ID_FIELDS_WITH_PERIOD-INVENTORYSPECIALSTOCKTYPE, sy-vline,
  WA_PISTOCK_ID_FIELDS_WITH_PERIOD-PHYSICALINVENTORYSTOCKTYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PISTOCK_ID_FIELDS_WITH_PERIOD 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_PISTOCK_ID_FIELDS_WITH_PERIOD 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_PISTOCK_ID_FIELDS_WITH_PERIOD INTO WA_PISTOCK_ID_FIELDS_WITH_PERIOD.


*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 MATN1, internal->external for field MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_PISTOCK_ID_FIELDS_WITH_PERIOD-MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PISTOCK_ID_FIELDS_WITH_PERIOD-MATERIAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SUPPLIER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PISTOCK_ID_FIELDS_WITH_PERIOD-SUPPLIER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PISTOCK_ID_FIELDS_WITH_PERIOD-SUPPLIER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SALESORDER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PISTOCK_ID_FIELDS_WITH_PERIOD-SALESORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PISTOCK_ID_FIELDS_WITH_PERIOD-SALESORDER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field WBSELEMENTINTERNALID
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_PISTOCK_ID_FIELDS_WITH_PERIOD-WBSELEMENTINTERNALID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PISTOCK_ID_FIELDS_WITH_PERIOD-WBSELEMENTINTERNALID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CUSTOMER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PISTOCK_ID_FIELDS_WITH_PERIOD-CUSTOMER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PISTOCK_ID_FIELDS_WITH_PERIOD-CUSTOMER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STOCKOWNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PISTOCK_ID_FIELDS_WITH_PERIOD-STOCKOWNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PISTOCK_ID_FIELDS_WITH_PERIOD-STOCKOWNER.
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_PISTOCK_ID_FIELDS_WITH_PERIOD_STR, 
MATERIAL TYPE STRING,
PLANT TYPE STRING,
STORAGELOCATION TYPE STRING,
BATCH TYPE STRING,
SUPPLIER TYPE STRING,
SALESORDER TYPE STRING,
SALESORDERITEM TYPE STRING,
WBSELEMENTINTERNALID TYPE STRING,
CUSTOMER TYPE STRING,
INVENTORYSPECIALSTOCKTYPE TYPE STRING,
PHYSICALINVENTORYSTOCKTYPE TYPE STRING,
STOCKOWNER TYPE STRING,
YEARPERIOD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PISTOCK_ID_FIELDS_WITH_PERIOD_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_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-MATERIAL sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-PLANT sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-STORAGELOCATION sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-BATCH sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-SUPPLIER sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-SALESORDER sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-SALESORDERITEM sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-WBSELEMENTINTERNALID sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-CUSTOMER sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-INVENTORYSPECIALSTOCKTYPE sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-PHYSICALINVENTORYSTOCKTYPE sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-STOCKOWNER sy-vline 
WA_PISTOCK_ID_FIELDS_WITH_PERIOD_STR-YEARPERIOD sy-vline      INTO ld_text SEPARATED BY SPACE.

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