ABAP Select data from SAP table PKRPREVCOM08 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PKRPREVCOM08 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 PKRPREVCOM08. 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 PKRPREVCOM08 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_PKRPREVCOM08 TYPE STANDARD TABLE OF PKRPREVCOM08,
      WA_PKRPREVCOM08 TYPE PKRPREVCOM08,
      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: <PKRPREVCOM08> TYPE PKRPREVCOM08.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PKRPREVCOM08.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PKRPREVCOM08
  INTO TABLE IT_PKRPREVCOM08.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PKRPREVCOM08
*  INTO TABLE @DATA(IT_PKRPREVCOM082).
*--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_PKRPREVCOM08 INDEX 1 INTO DATA(WA_PKRPREVCOM082).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PKRPREVCOM08 ASSIGNING <PKRPREVCOM08>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PKRPREVCOM08>-FOR01 = 1.
<PKRPREVCOM08>-CLD01 = 1.
<PKRPREVCOM08>-FOR02 = 1.
<PKRPREVCOM08>-CLD02 = 1.
<PKRPREVCOM08>-FOR03 = 1.

ENDLOOP.

LOOP AT IT_PKRPREVCOM08 INTO WA_PKRPREVCOM08.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PKRPREVCOM08-CLD03, sy-vline,
  WA_PKRPREVCOM08-FOR04, sy-vline,
  WA_PKRPREVCOM08-CLD04, sy-vline,
  WA_PKRPREVCOM08-FOR05, sy-vline,
  WA_PKRPREVCOM08-CLD05, sy-vline,
  WA_PKRPREVCOM08-REP01, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PKRPREVCOM08 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_PKRPREVCOM08 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_PKRPREVCOM08 INTO WA_PKRPREVCOM08.


*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_PKRPREVCOM08_STR, 
FOR01 TYPE STRING,
CLD01 TYPE STRING,
FOR02 TYPE STRING,
CLD02 TYPE STRING,
FOR03 TYPE STRING,
CLD03 TYPE STRING,
FOR04 TYPE STRING,
CLD04 TYPE STRING,
FOR05 TYPE STRING,
CLD05 TYPE STRING,
REP01 TYPE STRING,
REP02 TYPE STRING,
REP03 TYPE STRING,
REP04 TYPE STRING,
REP05 TYPE STRING,
TPA01 TYPE STRING,
TPA02 TYPE STRING,
TPA03 TYPE STRING,
TPA04 TYPE STRING,
TPA05 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PKRPREVCOM08_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_PKRPREVCOM08_STR-FOR01 sy-vline 
WA_PKRPREVCOM08_STR-CLD01 sy-vline 
WA_PKRPREVCOM08_STR-FOR02 sy-vline 
WA_PKRPREVCOM08_STR-CLD02 sy-vline 
WA_PKRPREVCOM08_STR-FOR03 sy-vline 
WA_PKRPREVCOM08_STR-CLD03 sy-vline 
WA_PKRPREVCOM08_STR-FOR04 sy-vline 
WA_PKRPREVCOM08_STR-CLD04 sy-vline 
WA_PKRPREVCOM08_STR-FOR05 sy-vline 
WA_PKRPREVCOM08_STR-CLD05 sy-vline 
WA_PKRPREVCOM08_STR-REP01 sy-vline 
WA_PKRPREVCOM08_STR-REP02 sy-vline 
WA_PKRPREVCOM08_STR-REP03 sy-vline 
WA_PKRPREVCOM08_STR-REP04 sy-vline 
WA_PKRPREVCOM08_STR-REP05 sy-vline 
WA_PKRPREVCOM08_STR-TPA01 sy-vline 
WA_PKRPREVCOM08_STR-TPA02 sy-vline 
WA_PKRPREVCOM08_STR-TPA03 sy-vline 
WA_PKRPREVCOM08_STR-TPA04 sy-vline 
WA_PKRPREVCOM08_STR-TPA05 sy-vline      INTO ld_text SEPARATED BY SPACE.

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