ABAP Select data from SAP table LDK06 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LDK06 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 LDK06. 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 LDK06 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_LDK06 TYPE STANDARD TABLE OF LDK06,
      WA_LDK06 TYPE LDK06,
      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: <LDK06> TYPE LDK06.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LDK06.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LDK06
  INTO TABLE IT_LDK06.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LDK06
*  INTO TABLE @DATA(IT_LDK062).
*--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_LDK06 INDEX 1 INTO DATA(WA_LDK062).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LDK06 ASSIGNING <LDK06>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LDK06>-MANDT = 1.
<LDK06>-SNKOM = 1.
<LDK06>-LNKOM = 1.
<LDK06>-SSKOM = 1.
<LDK06>-LGNUM = 1.

ENDLOOP.

LOOP AT IT_LDK06 INTO WA_LDK06.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LDK06-BNAME, sy-vline,
  WA_LDK06-MATNR, sy-vline,
  WA_LDK06-WERKS, sy-vline,
  WA_LDK06-CHARG, sy-vline,
  WA_LDK06-SOBKZ, sy-vline,
  WA_LDK06-SONUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LDK06 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_LDK06 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_LDK06 INTO WA_LDK06.


*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 MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_LDK06-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK06-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SONUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK06-SONUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK06-SONUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK06-MBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK06-MBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_LDK06-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK06-MJAHR.
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_LDK06_STR, 
MANDT TYPE STRING,
SNKOM TYPE STRING,
LNKOM TYPE STRING,
SSKOM TYPE STRING,
LGNUM TYPE STRING,
BNAME TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
CHARG TYPE STRING,
SOBKZ TYPE STRING,
SONUM TYPE STRING,
BSTQ1 TYPE STRING,
BSTQ2 TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LDK06_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_LDK06_STR-MANDT sy-vline 
WA_LDK06_STR-SNKOM sy-vline 
WA_LDK06_STR-LNKOM sy-vline 
WA_LDK06_STR-SSKOM sy-vline 
WA_LDK06_STR-LGNUM sy-vline 
WA_LDK06_STR-BNAME sy-vline 
WA_LDK06_STR-MATNR sy-vline 
WA_LDK06_STR-WERKS sy-vline 
WA_LDK06_STR-CHARG sy-vline 
WA_LDK06_STR-SOBKZ sy-vline 
WA_LDK06_STR-SONUM sy-vline 
WA_LDK06_STR-BSTQ1 sy-vline 
WA_LDK06_STR-BSTQ2 sy-vline 
WA_LDK06_STR-MBLNR sy-vline 
WA_LDK06_STR-MJAHR sy-vline      INTO ld_text SEPARATED BY SPACE.

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