ABAP Select data from SAP table PKRPREVCOM07 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PKRPREVCOM07 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 PKRPREVCOM07. 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 PKRPREVCOM07 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_PKRPREVCOM07 TYPE STANDARD TABLE OF PKRPREVCOM07,
      WA_PKRPREVCOM07 TYPE PKRPREVCOM07,
      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: <PKRPREVCOM07> TYPE PKRPREVCOM07.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PKRPREVCOM07.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PKRPREVCOM07
  INTO TABLE IT_PKRPREVCOM07.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PKRPREVCOM07
*  INTO TABLE @DATA(IT_PKRPREVCOM072).
*--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_PKRPREVCOM07 INDEX 1 INTO DATA(WA_PKRPREVCOM072).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PKRPREVCOM07 ASSIGNING <PKRPREVCOM07>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PKRPREVCOM07>-ONP01 = 1.
<PKRPREVCOM07>-ONP02 = 1.
<PKRPREVCOM07>-ONP03 = 1.
<PKRPREVCOM07>-ONP04 = 1.
<PKRPREVCOM07>-ONP05 = 1.

ENDLOOP.

LOOP AT IT_PKRPREVCOM07 INTO WA_PKRPREVCOM07.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PKRPREVCOM07-RSN01, sy-vline,
  WA_PKRPREVCOM07-RSN02, sy-vline,
  WA_PKRPREVCOM07-RSN03, sy-vline,
  WA_PKRPREVCOM07-RSN04, sy-vline,
  WA_PKRPREVCOM07-RSN05, sy-vline,
  WA_PKRPREVCOM07-STK01, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PKRPREVCOM07 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_PKRPREVCOM07 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_PKRPREVCOM07 INTO WA_PKRPREVCOM07.


*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_PKRPREVCOM07_STR, 
ONP01 TYPE STRING,
ONP02 TYPE STRING,
ONP03 TYPE STRING,
ONP04 TYPE STRING,
ONP05 TYPE STRING,
RSN01 TYPE STRING,
RSN02 TYPE STRING,
RSN03 TYPE STRING,
RSN04 TYPE STRING,
RSN05 TYPE STRING,
STK01 TYPE STRING,
STK02 TYPE STRING,
STK03 TYPE STRING,
STK04 TYPE STRING,
STK05 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PKRPREVCOM07_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_PKRPREVCOM07_STR-ONP01 sy-vline 
WA_PKRPREVCOM07_STR-ONP02 sy-vline 
WA_PKRPREVCOM07_STR-ONP03 sy-vline 
WA_PKRPREVCOM07_STR-ONP04 sy-vline 
WA_PKRPREVCOM07_STR-ONP05 sy-vline 
WA_PKRPREVCOM07_STR-RSN01 sy-vline 
WA_PKRPREVCOM07_STR-RSN02 sy-vline 
WA_PKRPREVCOM07_STR-RSN03 sy-vline 
WA_PKRPREVCOM07_STR-RSN04 sy-vline 
WA_PKRPREVCOM07_STR-RSN05 sy-vline 
WA_PKRPREVCOM07_STR-STK01 sy-vline 
WA_PKRPREVCOM07_STR-STK02 sy-vline 
WA_PKRPREVCOM07_STR-STK03 sy-vline 
WA_PKRPREVCOM07_STR-STK04 sy-vline 
WA_PKRPREVCOM07_STR-STK05 sy-vline      INTO ld_text SEPARATED BY SPACE.

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