ABAP Select data from SAP table KLZUEXTOBJ into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KLZUEXTOBJ
*  INTO TABLE @DATA(IT_KLZUEXTOBJ2).
*--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_KLZUEXTOBJ INDEX 1 INTO DATA(WA_KLZUEXTOBJ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KLZUEXTOBJ>-MANDT = 1.
<KLZUEXTOBJ>-OBJTYP = 1.
<KLZUEXTOBJ>-KREIS = 1.
<KLZUEXTOBJ>-EXTNR = 1.
<KLZUEXTOBJ>-OBJNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KLZUEXTOBJ-ARNR, sy-vline,
  WA_KLZUEXTOBJ-ARTYP, sy-vline,
  WA_KLZUEXTOBJ-XAKT, sy-vline,
  WA_KLZUEXTOBJ-XDAYENDINACT, sy-vline,
  WA_KLZUEXTOBJ-SDCPROD, sy-vline,
  WA_KLZUEXTOBJ-UPUSERT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KLZUEXTOBJ 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_KLZUEXTOBJ 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_KLZUEXTOBJ INTO WA_KLZUEXTOBJ.


*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_KLZUEXTOBJ_STR, 
MANDT TYPE STRING,
OBJTYP TYPE STRING,
KREIS TYPE STRING,
EXTNR TYPE STRING,
OBJNR TYPE STRING,
ARNR TYPE STRING,
ARTYP TYPE STRING,
XAKT TYPE STRING,
XDAYENDINACT TYPE STRING,
SDCPROD TYPE STRING,
UPUSERT TYPE STRING,
DUPDATT TYPE STRING,
TUPTIMT TYPE STRING,
CRUSER TYPE STRING,
DCRDAT TYPE STRING,
TCRTIM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KLZUEXTOBJ_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_KLZUEXTOBJ_STR-MANDT sy-vline 
WA_KLZUEXTOBJ_STR-OBJTYP sy-vline 
WA_KLZUEXTOBJ_STR-KREIS sy-vline 
WA_KLZUEXTOBJ_STR-EXTNR sy-vline 
WA_KLZUEXTOBJ_STR-OBJNR sy-vline 
WA_KLZUEXTOBJ_STR-ARNR sy-vline 
WA_KLZUEXTOBJ_STR-ARTYP sy-vline 
WA_KLZUEXTOBJ_STR-XAKT sy-vline 
WA_KLZUEXTOBJ_STR-XDAYENDINACT sy-vline 
WA_KLZUEXTOBJ_STR-SDCPROD sy-vline 
WA_KLZUEXTOBJ_STR-UPUSERT sy-vline 
WA_KLZUEXTOBJ_STR-DUPDATT sy-vline 
WA_KLZUEXTOBJ_STR-TUPTIMT sy-vline 
WA_KLZUEXTOBJ_STR-CRUSER sy-vline 
WA_KLZUEXTOBJ_STR-DCRDAT sy-vline 
WA_KLZUEXTOBJ_STR-TCRTIM sy-vline      INTO ld_text SEPARATED BY SPACE.

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