ABAP Select data from SAP table K9000 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP K9000 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 K9000. 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 K9000 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_K9000 TYPE STANDARD TABLE OF K9000,
      WA_K9000 TYPE K9000,
      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: <K9000> TYPE K9000.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_K9000.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM K9000
  INTO TABLE IT_K9000.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM K9000
*  INTO TABLE @DATA(IT_K90002).
*--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_K9000 INDEX 1 INTO DATA(WA_K90002).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_K9000 ASSIGNING <K9000>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<K9000>-MANDT = 1.
<K9000>-ERKRS = 1.
<K9000>-QFELD1 = 1.
<K9000>-QFELD2 = 1.
<K9000>-QFELD3_BIS = 1.

ENDLOOP.

LOOP AT IT_K9000 INTO WA_K9000.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_K9000-DAT2, sy-vline,
  WA_K9000-QFELD3_VON, sy-vline,
  WA_K9000-DAT1, sy-vline,
  WA_K9000-ZFELD1, sy-vline,
  WA_K9000-ZFELD2, sy-vline,
  WA_K9000-ZFELD3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_K9000 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_K9000 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_K9000 INTO WA_K9000.


*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_K9000_STR, 
MANDT TYPE STRING,
ERKRS TYPE STRING,
QFELD1 TYPE STRING,
QFELD2 TYPE STRING,
QFELD3_BIS TYPE STRING,
DAT2 TYPE STRING,
QFELD3_VON TYPE STRING,
DAT1 TYPE STRING,
ZFELD1 TYPE STRING,
ZFELD2 TYPE STRING,
ZFELD3 TYPE STRING,
ZFELD4 TYPE STRING,
ZFELD5 TYPE STRING,
ZFELD6 TYPE STRING,
ZFELD7 TYPE STRING,
ZFELD8 TYPE STRING,
ZFELD9 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_K9000_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_K9000_STR-MANDT sy-vline 
WA_K9000_STR-ERKRS sy-vline 
WA_K9000_STR-QFELD1 sy-vline 
WA_K9000_STR-QFELD2 sy-vline 
WA_K9000_STR-QFELD3_BIS sy-vline 
WA_K9000_STR-DAT2 sy-vline 
WA_K9000_STR-QFELD3_VON sy-vline 
WA_K9000_STR-DAT1 sy-vline 
WA_K9000_STR-ZFELD1 sy-vline 
WA_K9000_STR-ZFELD2 sy-vline 
WA_K9000_STR-ZFELD3 sy-vline 
WA_K9000_STR-ZFELD4 sy-vline 
WA_K9000_STR-ZFELD5 sy-vline 
WA_K9000_STR-ZFELD6 sy-vline 
WA_K9000_STR-ZFELD7 sy-vline 
WA_K9000_STR-ZFELD8 sy-vline 
WA_K9000_STR-ZFELD9 sy-vline      INTO ld_text SEPARATED BY SPACE.

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