ABAP Select data from SAP table KLSI01_BAK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KLSI01_BAK 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 KLSI01_BAK. 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 KLSI01_BAK 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_KLSI01_BAK TYPE STANDARD TABLE OF KLSI01_BAK,
      WA_KLSI01_BAK TYPE KLSI01_BAK,
      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: <KLSI01_BAK> TYPE KLSI01_BAK.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KLSI01_BAK.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KLSI01_BAK
  INTO TABLE IT_KLSI01_BAK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KLSI01_BAK
*  INTO TABLE @DATA(IT_KLSI01_BAK2).
*--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_KLSI01_BAK INDEX 1 INTO DATA(WA_KLSI01_BAK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KLSI01_BAK ASSIGNING <KLSI01_BAK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KLSI01_BAK>-MANDT = 1.
<KLSI01_BAK>-SID = 1.
<KLSI01_BAK>-SID_NAME = 1.
<KLSI01_BAK>-SID_KTXT = 1.
<KLSI01_BAK>-SITYP = 1.

ENDLOOP.

LOOP AT IT_KLSI01_BAK INTO WA_KLSI01_BAK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KLSI01_BAK-SIGEBER, sy-vline,
  WA_KLSI01_BAK-SIART, sy-vline,
  WA_KLSI01_BAK-BESITYP, sy-vline,
  WA_KLSI01_BAK-SIDEXT, sy-vline,
  WA_KLSI01_BAK-OBJNR, sy-vline,
  WA_KLSI01_BAK-DELFZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KLSI01_BAK 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_KLSI01_BAK 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_KLSI01_BAK INTO WA_KLSI01_BAK.


*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 ALPHA, internal->external for field SIGEBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KLSI01_BAK-SIGEBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLSI01_BAK-SIGEBER.
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_KLSI01_BAK_STR, 
MANDT TYPE STRING,
SID TYPE STRING,
SID_NAME TYPE STRING,
SID_KTXT TYPE STRING,
SITYP TYPE STRING,
SIGEBER TYPE STRING,
SIART TYPE STRING,
BESITYP TYPE STRING,
SIDEXT TYPE STRING,
OBJNR TYPE STRING,
DELFZ TYPE STRING,
XAKT TYPE STRING,
SIPRIO TYPE STRING,
UPUSERK TYPE STRING,
DUPDATK TYPE STRING,
TUPTIMK TYPE STRING,
CRUSERK TYPE STRING,
DCRDATK TYPE STRING,
TCRTIMK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KLSI01_BAK_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_KLSI01_BAK_STR-MANDT sy-vline 
WA_KLSI01_BAK_STR-SID sy-vline 
WA_KLSI01_BAK_STR-SID_NAME sy-vline 
WA_KLSI01_BAK_STR-SID_KTXT sy-vline 
WA_KLSI01_BAK_STR-SITYP sy-vline 
WA_KLSI01_BAK_STR-SIGEBER sy-vline 
WA_KLSI01_BAK_STR-SIART sy-vline 
WA_KLSI01_BAK_STR-BESITYP sy-vline 
WA_KLSI01_BAK_STR-SIDEXT sy-vline 
WA_KLSI01_BAK_STR-OBJNR sy-vline 
WA_KLSI01_BAK_STR-DELFZ sy-vline 
WA_KLSI01_BAK_STR-XAKT sy-vline 
WA_KLSI01_BAK_STR-SIPRIO sy-vline 
WA_KLSI01_BAK_STR-UPUSERK sy-vline 
WA_KLSI01_BAK_STR-DUPDATK sy-vline 
WA_KLSI01_BAK_STR-TUPTIMK sy-vline 
WA_KLSI01_BAK_STR-CRUSERK sy-vline 
WA_KLSI01_BAK_STR-DCRDATK sy-vline 
WA_KLSI01_BAK_STR-TCRTIMK sy-vline      INTO ld_text SEPARATED BY SPACE.

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