ABAP Select data from SAP table KLKEYS into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KLKEYS
*  INTO TABLE @DATA(IT_KLKEYS2).
*--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_KLKEYS INDEX 1 INTO DATA(WA_KLKEYS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KLKEYS>-OBJTYP = 1.
<KLKEYS>-BUKRS = 1.
<KLKEYS>-RANLALT1 = 1.
<KLKEYS>-RANL = 1.
<KLKEYS>-NORDEXT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KLKEYS-NORDER, sy-vline,
  WA_KLKEYS-REXTNR, sy-vline,
  WA_KLKEYS-RBKONT, sy-vline,
  WA_KLKEYS-RFHA, sy-vline,
  WA_KLKEYS-RUBEST, sy-vline,
  WA_KLKEYS-RANLW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KLKEYS 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_KLKEYS 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_KLKEYS INTO WA_KLKEYS.


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

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

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

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

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

*Conversion exit ACEXT, internal->external for field ACNUM_EXT
CALL FUNCTION 'CONVERSION_EXIT_ACEXT_OUTPUT'
  EXPORTING
    input =                      WA_KLKEYS-ACNUM_EXT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLKEYS-ACNUM_EXT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field RESERVG
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KLKEYS-RESERVG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLKEYS-RESERVG.
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_KLKEYS_STR, 
OBJTYP TYPE STRING,
BUKRS TYPE STRING,
RANLALT1 TYPE STRING,
RANL TYPE STRING,
NORDEXT TYPE STRING,
NORDER TYPE STRING,
REXTNR TYPE STRING,
RBKONT TYPE STRING,
RFHA TYPE STRING,
RUBEST TYPE STRING,
RANLW TYPE STRING,
RLDEPO TYPE STRING,
RIDEXT TYPE STRING,
RIDXRT TYPE STRING,
RIDBSTD TYPE STRING,
SSHLNG TYPE STRING,
RBESTO TYPE STRING,
ACNUM_EXT TYPE STRING,
BKKRS TYPE STRING,
EXTNR TYPE STRING,
RESERVG TYPE STRING,
VTNUM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KLKEYS_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_KLKEYS_STR-OBJTYP sy-vline 
WA_KLKEYS_STR-BUKRS sy-vline 
WA_KLKEYS_STR-RANLALT1 sy-vline 
WA_KLKEYS_STR-RANL sy-vline 
WA_KLKEYS_STR-NORDEXT sy-vline 
WA_KLKEYS_STR-NORDER sy-vline 
WA_KLKEYS_STR-REXTNR sy-vline 
WA_KLKEYS_STR-RBKONT sy-vline 
WA_KLKEYS_STR-RFHA sy-vline 
WA_KLKEYS_STR-RUBEST sy-vline 
WA_KLKEYS_STR-RANLW sy-vline 
WA_KLKEYS_STR-RLDEPO sy-vline 
WA_KLKEYS_STR-RIDEXT sy-vline 
WA_KLKEYS_STR-RIDXRT sy-vline 
WA_KLKEYS_STR-RIDBSTD sy-vline 
WA_KLKEYS_STR-SSHLNG sy-vline 
WA_KLKEYS_STR-RBESTO sy-vline 
WA_KLKEYS_STR-ACNUM_EXT sy-vline 
WA_KLKEYS_STR-BKKRS sy-vline 
WA_KLKEYS_STR-EXTNR sy-vline 
WA_KLKEYS_STR-RESERVG sy-vline 
WA_KLKEYS_STR-VTNUM sy-vline      INTO ld_text SEPARATED BY SPACE.

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