ABAP Select data from SAP table LDK01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LDK01 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 LDK01. 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 LDK01 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_LDK01 TYPE STANDARD TABLE OF LDK01,
      WA_LDK01 TYPE LDK01,
      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: <LDK01> TYPE LDK01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LDK01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LDK01
  INTO TABLE IT_LDK01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LDK01
*  INTO TABLE @DATA(IT_LDK012).
*--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_LDK01 INDEX 1 INTO DATA(WA_LDK012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LDK01 ASSIGNING <LDK01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LDK01>-MANDT = 1.
<LDK01>-SNKOM = 1.
<LDK01>-LNKOM = 1.
<LDK01>-SSKOM = 1.
<LDK01>-LGNUM = 1.

ENDLOOP.

LOOP AT IT_LDK01 INTO WA_LDK01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LDK01-TBPRI, sy-vline,
  WA_LDK01-TBFKZ, sy-vline,
  WA_LDK01-BNAME, sy-vline,
  WA_LDK01-MATNR, sy-vline,
  WA_LDK01-WERKS, sy-vline,
  WA_LDK01-CHARG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LDK01 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_LDK01 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_LDK01 INTO WA_LDK01.


*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_LDK01-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK01-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SONUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK01-SONUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK01-SONUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LDK01-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK01-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ALTME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LDK01-ALTME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK01-ALTME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK01-MBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK01-MBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_LDK01-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK01-MJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SMBLN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK01-SMBLN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK01-SMBLN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field SJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_LDK01-SJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK01-SJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LDK01-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK01-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BENUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LDK01-BENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LDK01-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_LDK01_STR, 
MANDT TYPE STRING,
SNKOM TYPE STRING,
LNKOM TYPE STRING,
SSKOM TYPE STRING,
LGNUM TYPE STRING,
TBPRI TYPE STRING,
TBFKZ TYPE STRING,
BNAME TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
CHARG TYPE STRING,
BESTQ TYPE STRING,
SOBKZ TYPE STRING,
SONUM TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
MENGA TYPE STRING,
ALTME TYPE STRING,
UMREZ TYPE STRING,
UMREN TYPE STRING,
WEMPF TYPE STRING,
ABLAD TYPE STRING,
WDATU TYPE STRING,
MBLNR TYPE STRING,
MJAHR TYPE STRING,
MBPOS TYPE STRING,
SMBLN TYPE STRING,
SMBLP TYPE STRING,
SJAHR TYPE STRING,
BRGEW TYPE STRING,
GEWEI TYPE STRING,
BETYP TYPE STRING,
BENUM TYPE STRING,
BWART TYPE STRING,
BWLVS TYPE STRING,
PDATU TYPE STRING,
PZEIT TYPE STRING,
SHKZG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LDK01_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_LDK01_STR-MANDT sy-vline 
WA_LDK01_STR-SNKOM sy-vline 
WA_LDK01_STR-LNKOM sy-vline 
WA_LDK01_STR-SSKOM sy-vline 
WA_LDK01_STR-LGNUM sy-vline 
WA_LDK01_STR-TBPRI sy-vline 
WA_LDK01_STR-TBFKZ sy-vline 
WA_LDK01_STR-BNAME sy-vline 
WA_LDK01_STR-MATNR sy-vline 
WA_LDK01_STR-WERKS sy-vline 
WA_LDK01_STR-CHARG sy-vline 
WA_LDK01_STR-BESTQ sy-vline 
WA_LDK01_STR-SOBKZ sy-vline 
WA_LDK01_STR-SONUM sy-vline 
WA_LDK01_STR-MENGE sy-vline 
WA_LDK01_STR-MEINS sy-vline 
WA_LDK01_STR-MENGA sy-vline 
WA_LDK01_STR-ALTME sy-vline 
WA_LDK01_STR-UMREZ sy-vline 
WA_LDK01_STR-UMREN sy-vline 
WA_LDK01_STR-WEMPF sy-vline 
WA_LDK01_STR-ABLAD sy-vline 
WA_LDK01_STR-WDATU sy-vline 
WA_LDK01_STR-MBLNR sy-vline 
WA_LDK01_STR-MJAHR sy-vline 
WA_LDK01_STR-MBPOS sy-vline 
WA_LDK01_STR-SMBLN sy-vline 
WA_LDK01_STR-SMBLP sy-vline 
WA_LDK01_STR-SJAHR sy-vline 
WA_LDK01_STR-BRGEW sy-vline 
WA_LDK01_STR-GEWEI sy-vline 
WA_LDK01_STR-BETYP sy-vline 
WA_LDK01_STR-BENUM sy-vline 
WA_LDK01_STR-BWART sy-vline 
WA_LDK01_STR-BWLVS sy-vline 
WA_LDK01_STR-PDATU sy-vline 
WA_LDK01_STR-PZEIT sy-vline 
WA_LDK01_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.