ABAP Select data from SAP table CNV_20375_CHECK_S_KSTAR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_20375_CHECK_S_KSTAR 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 CNV_20375_CHECK_S_KSTAR. 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 CNV_20375_CHECK_S_KSTAR 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_CNV_20375_CHECK_S_KSTAR TYPE STANDARD TABLE OF CNV_20375_CHECK_S_KSTAR,
      WA_CNV_20375_CHECK_S_KSTAR TYPE CNV_20375_CHECK_S_KSTAR,
      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: <CNV_20375_CHECK_S_KSTAR> TYPE CNV_20375_CHECK_S_KSTAR.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CNV_20375_CHECK_S_KSTAR.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CNV_20375_CHECK_S_KSTAR
  INTO TABLE IT_CNV_20375_CHECK_S_KSTAR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_20375_CHECK_S_KSTAR
*  INTO TABLE @DATA(IT_CNV_20375_CHECK_S_KSTAR2).
*--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_CNV_20375_CHECK_S_KSTAR INDEX 1 INTO DATA(WA_CNV_20375_CHECK_S_KSTAR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CNV_20375_CHECK_S_KSTAR ASSIGNING <CNV_20375_CHECK_S_KSTAR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_20375_CHECK_S_KSTAR>-KOKRS = 1.
<CNV_20375_CHECK_S_KSTAR>-KSTAR = 1.
<CNV_20375_CHECK_S_KSTAR>-DATBI = 1.
<CNV_20375_CHECK_S_KSTAR>-DATAB = 1.
<CNV_20375_CHECK_S_KSTAR>-KATYP = 1.

ENDLOOP.

LOOP AT IT_CNV_20375_CHECK_S_KSTAR INTO WA_CNV_20375_CHECK_S_KSTAR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_20375_CHECK_S_KSTAR-EIGEN, sy-vline,
  WA_CNV_20375_CHECK_S_KSTAR-PLAZU, sy-vline,
  WA_CNV_20375_CHECK_S_KSTAR-PLAOR, sy-vline,
  WA_CNV_20375_CHECK_S_KSTAR-PLAUS, sy-vline,
  WA_CNV_20375_CHECK_S_KSTAR-KOSTL, sy-vline,
  WA_CNV_20375_CHECK_S_KSTAR-AUFNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_20375_CHECK_S_KSTAR 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_CNV_20375_CHECK_S_KSTAR 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_CNV_20375_CHECK_S_KSTAR INTO WA_CNV_20375_CHECK_S_KSTAR.


*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 KSTAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20375_CHECK_S_KSTAR-KSTAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20375_CHECK_S_KSTAR-KSTAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KATYP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20375_CHECK_S_KSTAR-KATYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20375_CHECK_S_KSTAR-KATYP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20375_CHECK_S_KSTAR-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20375_CHECK_S_KSTAR-KOSTL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AUFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20375_CHECK_S_KSTAR-AUFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20375_CHECK_S_KSTAR-AUFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MSEHI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20375_CHECK_S_KSTAR-MSEHI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20375_CHECK_S_KSTAR-MSEHI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RECID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNV_20375_CHECK_S_KSTAR-RECID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_20375_CHECK_S_KSTAR-RECID.
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_CNV_20375_CHECK_S_KSTAR_STR, 
KOKRS TYPE STRING,
KSTAR TYPE STRING,
DATBI TYPE STRING,
DATAB TYPE STRING,
KATYP TYPE STRING,
EIGEN TYPE STRING,
PLAZU TYPE STRING,
PLAOR TYPE STRING,
PLAUS TYPE STRING,
KOSTL TYPE STRING,
AUFNR TYPE STRING,
MGEFL TYPE STRING,
MSEHI TYPE STRING,
DEAKT TYPE STRING,
LOEVM TYPE STRING,
RECID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_20375_CHECK_S_KSTAR_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_CNV_20375_CHECK_S_KSTAR_STR-KOKRS sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-KSTAR sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-DATBI sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-DATAB sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-KATYP sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-EIGEN sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-PLAZU sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-PLAOR sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-PLAUS sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-KOSTL sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-AUFNR sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-MGEFL sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-MSEHI sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-DEAKT sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-LOEVM sy-vline 
WA_CNV_20375_CHECK_S_KSTAR_STR-RECID sy-vline      INTO ld_text SEPARATED BY SPACE.

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