ABAP Select data from SAP table LDOKU into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LDOKU
*  INTO TABLE @DATA(IT_LDOKU2).
*--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_LDOKU INDEX 1 INTO DATA(WA_LDOKU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LDOKU>-D0001 = 1.
<LDOKU>-D0002 = 1.
<LDOKU>-D0003 = 1.
<LDOKU>-D0004 = 1.
<LDOKU>-D0005 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LDOKU-D0006, sy-vline,
  WA_LDOKU-D0007, sy-vline,
  WA_LDOKU-D0008, sy-vline,
  WA_LDOKU-D0009, sy-vline,
  WA_LDOKU-D0010, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_LDOKU 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_LDOKU 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_LDOKU INTO WA_LDOKU.


*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_LDOKU_STR, 
D0001 TYPE STRING,
D0002 TYPE STRING,
D0003 TYPE STRING,
D0004 TYPE STRING,
D0005 TYPE STRING,
D0006 TYPE STRING,
D0007 TYPE STRING,
D0008 TYPE STRING,
D0009 TYPE STRING,
D0010 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LDOKU_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_LDOKU_STR-D0001 sy-vline 
WA_LDOKU_STR-D0002 sy-vline 
WA_LDOKU_STR-D0003 sy-vline 
WA_LDOKU_STR-D0004 sy-vline 
WA_LDOKU_STR-D0005 sy-vline 
WA_LDOKU_STR-D0006 sy-vline 
WA_LDOKU_STR-D0007 sy-vline 
WA_LDOKU_STR-D0008 sy-vline 
WA_LDOKU_STR-D0009 sy-vline 
WA_LDOKU_STR-D0010 sy-vline      INTO ld_text SEPARATED BY SPACE.

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