ABAP Select data from SAP table KLGSTR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KLGSTR
*  INTO TABLE @DATA(IT_KLGSTR2).
*--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_KLGSTR INDEX 1 INTO DATA(WA_KLGSTR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KLGSTR>-BUKRS = 1.
<KLGSTR>-PARTNR = 1.
<KLGSTR>-SLPG = 1.
<KLGSTR>-RPORTB = 1.
<KLGSTR>-RDEALER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KLGSTR-WAERS, sy-vline,
  WA_KLGSTR-CONTROL01, sy-vline,
  WA_KLGSTR-INTORG, sy-vline,
  WA_KLGSTR-RCOUNTRY, sy-vline,
  WA_KLGSTR-COUNTRY, sy-vline,
  WA_KLGSTR-SECTOR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KLGSTR 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_KLGSTR 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_KLGSTR INTO WA_KLGSTR.


*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 PARTNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KLGSTR-PARTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLGSTR-PARTNR.
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_KLGSTR_STR, 
BUKRS TYPE STRING,
PARTNR TYPE STRING,
SLPG TYPE STRING,
RPORTB TYPE STRING,
RDEALER TYPE STRING,
WAERS TYPE STRING,
CONTROL01 TYPE STRING,
INTORG TYPE STRING,
RCOUNTRY TYPE STRING,
COUNTRY TYPE STRING,
SECTOR TYPE STRING,
RATING TYPE STRING,
CRATING TYPE STRING,
NID TYPE STRING,
CAID TYPE STRING,
FAZNR TYPE STRING,
RRFIND TYPE STRING,
CEQCLASS TYPE STRING,
LEQCLASS TYPE STRING,
LRB TYPE STRING,
SRE TYPE STRING,
SARAKT TYPE STRING,
SLRAKT TYPE STRING,
BKNZMANI TYPE STRING,
DFIKT TYPE STRING,
SKALID TYPE STRING,
DMWAE TYPE STRING,
DRBD TYPE STRING,
DBLFZ TYPE STRING,
DELFZ TYPE STRING,
DBMWAE TYPE STRING,
DFIKTVGL TYPE STRING,
OBJTYP TYPE STRING,
KREIS TYPE STRING,
EXTNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KLGSTR_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_KLGSTR_STR-BUKRS sy-vline 
WA_KLGSTR_STR-PARTNR sy-vline 
WA_KLGSTR_STR-SLPG sy-vline 
WA_KLGSTR_STR-RPORTB sy-vline 
WA_KLGSTR_STR-RDEALER sy-vline 
WA_KLGSTR_STR-WAERS sy-vline 
WA_KLGSTR_STR-CONTROL01 sy-vline 
WA_KLGSTR_STR-INTORG sy-vline 
WA_KLGSTR_STR-RCOUNTRY sy-vline 
WA_KLGSTR_STR-COUNTRY sy-vline 
WA_KLGSTR_STR-SECTOR sy-vline 
WA_KLGSTR_STR-RATING sy-vline 
WA_KLGSTR_STR-CRATING sy-vline 
WA_KLGSTR_STR-NID sy-vline 
WA_KLGSTR_STR-CAID sy-vline 
WA_KLGSTR_STR-FAZNR sy-vline 
WA_KLGSTR_STR-RRFIND sy-vline 
WA_KLGSTR_STR-CEQCLASS sy-vline 
WA_KLGSTR_STR-LEQCLASS sy-vline 
WA_KLGSTR_STR-LRB sy-vline 
WA_KLGSTR_STR-SRE sy-vline 
WA_KLGSTR_STR-SARAKT sy-vline 
WA_KLGSTR_STR-SLRAKT sy-vline 
WA_KLGSTR_STR-BKNZMANI sy-vline 
WA_KLGSTR_STR-DFIKT sy-vline 
WA_KLGSTR_STR-SKALID sy-vline 
WA_KLGSTR_STR-DMWAE sy-vline 
WA_KLGSTR_STR-DRBD sy-vline 
WA_KLGSTR_STR-DBLFZ sy-vline 
WA_KLGSTR_STR-DELFZ sy-vline 
WA_KLGSTR_STR-DBMWAE sy-vline 
WA_KLGSTR_STR-DFIKTVGL sy-vline 
WA_KLGSTR_STR-OBJTYP sy-vline 
WA_KLGSTR_STR-KREIS sy-vline 
WA_KLGSTR_STR-EXTNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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