ABAP Select data from SAP table LDK33 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LDK33 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 LDK33. 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 LDK33 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_LDK33 TYPE STANDARD TABLE OF LDK33,
      WA_LDK33 TYPE LDK33,
      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: <LDK33> TYPE LDK33.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LDK33.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LDK33
  INTO TABLE IT_LDK33.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LDK33
*  INTO TABLE @DATA(IT_LDK332).
*--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_LDK33 INDEX 1 INTO DATA(WA_LDK332).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LDK33 ASSIGNING <LDK33>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LDK33>-LGNUM = 1.
<LDK33>-MATNR = 1.
<LDK33>-WERKS = 1.
<LDK33>-CHARG = 1.
<LDK33>-BESTQ = 1.

ENDLOOP.

LOOP AT IT_LDK33 INTO WA_LDK33.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LDK33-SOBKZ, sy-vline,
  WA_LDK33-LSONR, sy-vline,
  WA_LDK33-LGTYP, sy-vline,
  WA_LDK33-LGPLA, sy-vline,
  WA_LDK33-PLPOS, sy-vline,
  WA_LDK33-SKZUE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LDK33 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_LDK33 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_LDK33 INTO WA_LDK33.


*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_LDK33-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK33-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field WENUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK33-WENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK33-WENUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LDK33-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK33-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LDK33-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK33-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field IVNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK33-IVNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK33-IVNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BENUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK33-BENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK33-BENUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LENUM, internal->external for field LENUM
CALL FUNCTION 'CONVERSION_EXIT_LENUM_OUTPUT'
  EXPORTING
    input =                      WA_LDK33-LENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK33-LENUM.
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_LDK33_STR, 
LGNUM TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
CHARG TYPE STRING,
BESTQ TYPE STRING,
SOBKZ TYPE STRING,
LSONR TYPE STRING,
LGTYP TYPE STRING,
LGPLA TYPE STRING,
PLPOS TYPE STRING,
SKZUE TYPE STRING,
SKZUA TYPE STRING,
SKZSE TYPE STRING,
SKZSA TYPE STRING,
SKZSI TYPE STRING,
SPGRU TYPE STRING,
ZEUGN TYPE STRING,
BDATU TYPE STRING,
BZEIT TYPE STRING,
BTANR TYPE STRING,
BTAPS TYPE STRING,
EDATU TYPE STRING,
EZEIT TYPE STRING,
ADATU TYPE STRING,
AZEIT TYPE STRING,
WDATU TYPE STRING,
WENUM TYPE STRING,
WEPOS TYPE STRING,
LETYP TYPE STRING,
MEINS TYPE STRING,
GESME TYPE STRING,
VERME TYPE STRING,
EINME TYPE STRING,
AUSME TYPE STRING,
MGEWI TYPE STRING,
GEWEI TYPE STRING,
TBNUM TYPE STRING,
IVNUM TYPE STRING,
IVPOS TYPE STRING,
BETYP TYPE STRING,
BENUM TYPE STRING,
LENUM TYPE STRING,
ZDATU TYPE STRING,
VFDAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LDK33_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_LDK33_STR-LGNUM sy-vline 
WA_LDK33_STR-MATNR sy-vline 
WA_LDK33_STR-WERKS sy-vline 
WA_LDK33_STR-CHARG sy-vline 
WA_LDK33_STR-BESTQ sy-vline 
WA_LDK33_STR-SOBKZ sy-vline 
WA_LDK33_STR-LSONR sy-vline 
WA_LDK33_STR-LGTYP sy-vline 
WA_LDK33_STR-LGPLA sy-vline 
WA_LDK33_STR-PLPOS sy-vline 
WA_LDK33_STR-SKZUE sy-vline 
WA_LDK33_STR-SKZUA sy-vline 
WA_LDK33_STR-SKZSE sy-vline 
WA_LDK33_STR-SKZSA sy-vline 
WA_LDK33_STR-SKZSI sy-vline 
WA_LDK33_STR-SPGRU sy-vline 
WA_LDK33_STR-ZEUGN sy-vline 
WA_LDK33_STR-BDATU sy-vline 
WA_LDK33_STR-BZEIT sy-vline 
WA_LDK33_STR-BTANR sy-vline 
WA_LDK33_STR-BTAPS sy-vline 
WA_LDK33_STR-EDATU sy-vline 
WA_LDK33_STR-EZEIT sy-vline 
WA_LDK33_STR-ADATU sy-vline 
WA_LDK33_STR-AZEIT sy-vline 
WA_LDK33_STR-WDATU sy-vline 
WA_LDK33_STR-WENUM sy-vline 
WA_LDK33_STR-WEPOS sy-vline 
WA_LDK33_STR-LETYP sy-vline 
WA_LDK33_STR-MEINS sy-vline 
WA_LDK33_STR-GESME sy-vline 
WA_LDK33_STR-VERME sy-vline 
WA_LDK33_STR-EINME sy-vline 
WA_LDK33_STR-AUSME sy-vline 
WA_LDK33_STR-MGEWI sy-vline 
WA_LDK33_STR-GEWEI sy-vline 
WA_LDK33_STR-TBNUM sy-vline 
WA_LDK33_STR-IVNUM sy-vline 
WA_LDK33_STR-IVPOS sy-vline 
WA_LDK33_STR-BETYP sy-vline 
WA_LDK33_STR-BENUM sy-vline 
WA_LDK33_STR-LENUM sy-vline 
WA_LDK33_STR-ZDATU sy-vline 
WA_LDK33_STR-VFDAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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