ABAP Select data from SAP table P2KR_KRSI into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P2KR_KRSI 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 P2KR_KRSI. 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 P2KR_KRSI 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_P2KR_KRSI TYPE STANDARD TABLE OF P2KR_KRSI,
      WA_P2KR_KRSI TYPE P2KR_KRSI,
      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: <P2KR_KRSI> TYPE P2KR_KRSI.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P2KR_KRSI.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P2KR_KRSI
  INTO TABLE IT_P2KR_KRSI.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P2KR_KRSI
*  INTO TABLE @DATA(IT_P2KR_KRSI2).
*--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_P2KR_KRSI INDEX 1 INTO DATA(WA_P2KR_KRSI2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P2KR_KRSI ASSIGNING <P2KR_KRSI>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P2KR_KRSI>-MANDT = 1.
<P2KR_KRSI>-DCT_PERNR = 1.
<P2KR_KRSI>-DCT_SEQNR = 1.
<P2KR_KRSI>-DCT_ROWID = 1.
<P2KR_KRSI>-CNTR1 = 1.

ENDLOOP.

LOOP AT IT_P2KR_KRSI INTO WA_P2KR_KRSI.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P2KR_KRSI-BEGDA, sy-vline,
  WA_P2KR_KRSI-ENDDA, sy-vline,
  WA_P2KR_KRSI-SUBTY, sy-vline,
  WA_P2KR_KRSI-SIMOD, sy-vline,
  WA_P2KR_KRSI-AVEMD, sy-vline,
  WA_P2KR_KRSI-ENTID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P2KR_KRSI 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_P2KR_KRSI 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_P2KR_KRSI INTO WA_P2KR_KRSI.


*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_P2KR_KRSI_STR, 
MANDT TYPE STRING,
DCT_PERNR TYPE STRING,
DCT_SEQNR TYPE STRING,
DCT_ROWID TYPE STRING,
CNTR1 TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
SUBTY TYPE STRING,
SIMOD TYPE STRING,
AVEMD TYPE STRING,
ENTID TYPE STRING,
EALID TYPE STRING,
SIERP TYPE STRING,
FDNHM TYPE STRING,
RCMSC TYPE STRING,
SICMP TYPE STRING,
OVSWK TYPE STRING,
EIENT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P2KR_KRSI_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_P2KR_KRSI_STR-MANDT sy-vline 
WA_P2KR_KRSI_STR-DCT_PERNR sy-vline 
WA_P2KR_KRSI_STR-DCT_SEQNR sy-vline 
WA_P2KR_KRSI_STR-DCT_ROWID sy-vline 
WA_P2KR_KRSI_STR-CNTR1 sy-vline 
WA_P2KR_KRSI_STR-BEGDA sy-vline 
WA_P2KR_KRSI_STR-ENDDA sy-vline 
WA_P2KR_KRSI_STR-SUBTY sy-vline 
WA_P2KR_KRSI_STR-SIMOD sy-vline 
WA_P2KR_KRSI_STR-AVEMD sy-vline 
WA_P2KR_KRSI_STR-ENTID sy-vline 
WA_P2KR_KRSI_STR-EALID sy-vline 
WA_P2KR_KRSI_STR-SIERP sy-vline 
WA_P2KR_KRSI_STR-FDNHM sy-vline 
WA_P2KR_KRSI_STR-RCMSC sy-vline 
WA_P2KR_KRSI_STR-SICMP sy-vline 
WA_P2KR_KRSI_STR-OVSWK sy-vline 
WA_P2KR_KRSI_STR-EIENT sy-vline      INTO ld_text SEPARATED BY SPACE.

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