ABAP Select data from SAP table LDK34 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LDK34 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 LDK34. 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 LDK34 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_LDK34 TYPE STANDARD TABLE OF LDK34,
      WA_LDK34 TYPE LDK34,
      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: <LDK34> TYPE LDK34.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LDK34.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LDK34
  INTO TABLE IT_LDK34.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LDK34
*  INTO TABLE @DATA(IT_LDK342).
*--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_LDK34 INDEX 1 INTO DATA(WA_LDK342).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LDK34 ASSIGNING <LDK34>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LDK34>-LGNUM = 1.
<LDK34>-LGTYP = 1.
<LDK34>-LGPLA = 1.
<LDK34>-LGBER = 1.
<LDK34>-LPTYP = 1.

ENDLOOP.

LOOP AT IT_LDK34 INTO WA_LDK34.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LDK34-PLAUF, sy-vline,
  WA_LDK34-SKZUA, sy-vline,
  WA_LDK34-SKZUE, sy-vline,
  WA_LDK34-SKZSA, sy-vline,
  WA_LDK34-SKZSE, sy-vline,
  WA_LDK34-SKZSI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LDK34 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_LDK34 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_LDK34 INTO WA_LDK34.


*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 CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LDK34-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK34-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field IVNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK34-IVNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK34-IVNUM.
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_LDK34_STR, 
LGNUM TYPE STRING,
LGTYP TYPE STRING,
LGPLA TYPE STRING,
LGBER TYPE STRING,
LPTYP TYPE STRING,
PLAUF TYPE STRING,
SKZUA TYPE STRING,
SKZUE TYPE STRING,
SKZSA TYPE STRING,
SKZSE TYPE STRING,
SKZSI TYPE STRING,
SPGRU TYPE STRING,
ANZQU TYPE STRING,
MAXQU TYPE STRING,
ANZLE TYPE STRING,
MAXLE TYPE STRING,
KZDYN TYPE STRING,
LGEWI TYPE STRING,
GEWEI TYPE STRING,
MGEWI TYPE STRING,
BDATU TYPE STRING,
BZEIT TYPE STRING,
BTANR TYPE STRING,
BTAPS TYPE STRING,
RDATU TYPE STRING,
RZEIT TYPE STRING,
KZINV TYPE STRING,
IDATU TYPE STRING,
IVNUM TYPE STRING,
IVPOS TYPE STRING,
IVIVO TYPE STRING,
KZLER TYPE STRING,
KZVOL TYPE STRING,
SORLP TYPE STRING,
BRAND TYPE STRING,
UNAME TYPE STRING,
LAEDT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LDK34_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_LDK34_STR-LGNUM sy-vline 
WA_LDK34_STR-LGTYP sy-vline 
WA_LDK34_STR-LGPLA sy-vline 
WA_LDK34_STR-LGBER sy-vline 
WA_LDK34_STR-LPTYP sy-vline 
WA_LDK34_STR-PLAUF sy-vline 
WA_LDK34_STR-SKZUA sy-vline 
WA_LDK34_STR-SKZUE sy-vline 
WA_LDK34_STR-SKZSA sy-vline 
WA_LDK34_STR-SKZSE sy-vline 
WA_LDK34_STR-SKZSI sy-vline 
WA_LDK34_STR-SPGRU sy-vline 
WA_LDK34_STR-ANZQU sy-vline 
WA_LDK34_STR-MAXQU sy-vline 
WA_LDK34_STR-ANZLE sy-vline 
WA_LDK34_STR-MAXLE sy-vline 
WA_LDK34_STR-KZDYN sy-vline 
WA_LDK34_STR-LGEWI sy-vline 
WA_LDK34_STR-GEWEI sy-vline 
WA_LDK34_STR-MGEWI sy-vline 
WA_LDK34_STR-BDATU sy-vline 
WA_LDK34_STR-BZEIT sy-vline 
WA_LDK34_STR-BTANR sy-vline 
WA_LDK34_STR-BTAPS sy-vline 
WA_LDK34_STR-RDATU sy-vline 
WA_LDK34_STR-RZEIT sy-vline 
WA_LDK34_STR-KZINV sy-vline 
WA_LDK34_STR-IDATU sy-vline 
WA_LDK34_STR-IVNUM sy-vline 
WA_LDK34_STR-IVPOS sy-vline 
WA_LDK34_STR-IVIVO sy-vline 
WA_LDK34_STR-KZLER sy-vline 
WA_LDK34_STR-KZVOL sy-vline 
WA_LDK34_STR-SORLP sy-vline 
WA_LDK34_STR-BRAND sy-vline 
WA_LDK34_STR-UNAME sy-vline 
WA_LDK34_STR-LAEDT sy-vline      INTO ld_text SEPARATED BY SPACE.

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