ABAP Select data from SAP table LDK02 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LDK02 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 LDK02. 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 LDK02 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_LDK02 TYPE STANDARD TABLE OF LDK02,
      WA_LDK02 TYPE LDK02,
      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: <LDK02> TYPE LDK02.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LDK02.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LDK02
  INTO TABLE IT_LDK02.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LDK02
*  INTO TABLE @DATA(IT_LDK022).
*--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_LDK02 INDEX 1 INTO DATA(WA_LDK022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LDK02 ASSIGNING <LDK02>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LDK02>-MANDT = 1.
<LDK02>-SNKOM = 1.
<LDK02>-LNKOM = 1.
<LDK02>-SSKOM = 1.
<LDK02>-LGNUM = 1.

ENDLOOP.

LOOP AT IT_LDK02 INTO WA_LDK02.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LDK02-BWLVS, sy-vline,
  WA_LDK02-TBPRI, sy-vline,
  WA_LDK02-UBFKZ, sy-vline,
  WA_LDK02-UBTXT, sy-vline,
  WA_LDK02-BNAME, sy-vline,
  WA_LDK02-MATN1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LDK02 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_LDK02 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_LDK02 INTO WA_LDK02.


*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 MATN1
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-MATN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-MATN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SONR1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-SONR1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-SONR1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATN2
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-MATN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-MATN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SONR2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-SONR2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-SONR2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ALTM1
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-ALTM1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-ALTM1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-MBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-MBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-MJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SMBLN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-SMBLN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-SMBLN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field SJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-SJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-SJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field WENUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-WENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-WENUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BENUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK02-BENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK02-BENUM.
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_LDK02_STR, 
MANDT TYPE STRING,
SNKOM TYPE STRING,
LNKOM TYPE STRING,
SSKOM TYPE STRING,
LGNUM TYPE STRING,
BWLVS TYPE STRING,
TBPRI TYPE STRING,
UBFKZ TYPE STRING,
UBTXT TYPE STRING,
BNAME TYPE STRING,
MATN1 TYPE STRING,
WERK1 TYPE STRING,
CHRG1 TYPE STRING,
BSTQ1 TYPE STRING,
SOKZ1 TYPE STRING,
SONR1 TYPE STRING,
MATN2 TYPE STRING,
WERK2 TYPE STRING,
CHRG2 TYPE STRING,
BSTQ2 TYPE STRING,
SOKZ2 TYPE STRING,
SONR2 TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
MNGA1 TYPE STRING,
ALTM1 TYPE STRING,
UMRZ1 TYPE STRING,
UMRN1 TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
MBPOS TYPE STRING,
SMBLN TYPE STRING,
SJAHR TYPE STRING,
SMBLP TYPE STRING,
WENUM TYPE STRING,
BRGEW TYPE STRING,
GEWEI TYPE STRING,
BETYP TYPE STRING,
BENUM TYPE STRING,
BWART TYPE STRING,
PDATU TYPE STRING,
PZEIT TYPE STRING,
SHKZG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LDK02_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_LDK02_STR-MANDT sy-vline 
WA_LDK02_STR-SNKOM sy-vline 
WA_LDK02_STR-LNKOM sy-vline 
WA_LDK02_STR-SSKOM sy-vline 
WA_LDK02_STR-LGNUM sy-vline 
WA_LDK02_STR-BWLVS sy-vline 
WA_LDK02_STR-TBPRI sy-vline 
WA_LDK02_STR-UBFKZ sy-vline 
WA_LDK02_STR-UBTXT sy-vline 
WA_LDK02_STR-BNAME sy-vline 
WA_LDK02_STR-MATN1 sy-vline 
WA_LDK02_STR-WERK1 sy-vline 
WA_LDK02_STR-CHRG1 sy-vline 
WA_LDK02_STR-BSTQ1 sy-vline 
WA_LDK02_STR-SOKZ1 sy-vline 
WA_LDK02_STR-SONR1 sy-vline 
WA_LDK02_STR-MATN2 sy-vline 
WA_LDK02_STR-WERK2 sy-vline 
WA_LDK02_STR-CHRG2 sy-vline 
WA_LDK02_STR-BSTQ2 sy-vline 
WA_LDK02_STR-SOKZ2 sy-vline 
WA_LDK02_STR-SONR2 sy-vline 
WA_LDK02_STR-MENGE sy-vline 
WA_LDK02_STR-MEINS sy-vline 
WA_LDK02_STR-MNGA1 sy-vline 
WA_LDK02_STR-ALTM1 sy-vline 
WA_LDK02_STR-UMRZ1 sy-vline 
WA_LDK02_STR-UMRN1 sy-vline 
WA_LDK02_STR-MBLNR sy-vline 
WA_LDK02_STR-MJAHR sy-vline 
WA_LDK02_STR-MBPOS sy-vline 
WA_LDK02_STR-SMBLN sy-vline 
WA_LDK02_STR-SJAHR sy-vline 
WA_LDK02_STR-SMBLP sy-vline 
WA_LDK02_STR-WENUM sy-vline 
WA_LDK02_STR-BRGEW sy-vline 
WA_LDK02_STR-GEWEI sy-vline 
WA_LDK02_STR-BETYP sy-vline 
WA_LDK02_STR-BENUM sy-vline 
WA_LDK02_STR-BWART sy-vline 
WA_LDK02_STR-PDATU sy-vline 
WA_LDK02_STR-PZEIT sy-vline 
WA_LDK02_STR-SHKZG sy-vline      INTO ld_text SEPARATED BY SPACE.

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