ABAP Select data from SAP table LK01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP LK01 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 LK01. 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 LK01 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_LK01 TYPE STANDARD TABLE OF LK01,
      WA_LK01 TYPE LK01,
      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: <LK01> TYPE LK01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_LK01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM LK01
  INTO TABLE IT_LK01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LK01
*  INTO TABLE @DATA(IT_LK012).
*--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_LK01 INDEX 1 INTO DATA(WA_LK012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_LK01 ASSIGNING <LK01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LK01>-MANDT = 1.
<LK01>-SAKOM = 1.
<LK01>-LGNUM = 1.
<LK01>-TBNUM = 1.
<LK01>-TBPOS = 1.

ENDLOOP.

LOOP AT IT_LK01 INTO WA_LK01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LK01-TRART, sy-vline,
  WA_LK01-TBPRI, sy-vline,
  WA_LK01-TBFKZ, sy-vline,
  WA_LK01-BNAME, sy-vline,
  WA_LK01-MATNR, sy-vline,
  WA_LK01-WERKS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LK01 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_LK01 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_LK01 INTO WA_LK01.


*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_LK01-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SONUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK01-SONUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-SONUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LK01-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field ALTME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LK01-ALTME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-ALTME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MBLNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK01-MBLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-MBLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field MJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_LK01-MJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-MJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SMBLN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK01-SMBLN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-SMBLN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field SJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_LK01-SJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-SJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_LK01-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-GEWEI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field BENUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK01-BENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-BENUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field QPLOS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK01-QPLOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-QPLOS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PKNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK01-PKNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-PKNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field QPLOA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK01-QPLOA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-QPLOA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LENUM, internal->external for field LENUM
CALL FUNCTION 'CONVERSION_EXIT_LENUM_OUTPUT'
  EXPORTING
    input =                      WA_LK01-LENUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-LENUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LK01-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LK01-VBELN.
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_LK01_STR, 
MANDT TYPE STRING,
SAKOM TYPE STRING,
LGNUM TYPE STRING,
TBNUM TYPE STRING,
TBPOS TYPE STRING,
TRART 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,
VLTYP TYPE STRING,
VLPLA TYPE STRING,
VKDYN TYPE STRING,
VSCHN TYPE STRING,
NLTYP TYPE STRING,
NLPLA TYPE STRING,
NKDYN TYPE STRING,
NSCHN TYPE STRING,
PDATU TYPE STRING,
PZEIT TYPE STRING,
KLFR2 TYPE STRING,
LQNUM TYPE STRING,
QPLOS TYPE STRING,
TBKTX TYPE STRING,
TBRUE TYPE STRING,
RSNUM TYPE STRING,
RSPOS TYPE STRING,
LZNUM TYPE STRING,
ANZL1 TYPE STRING,
ANZL2 TYPE STRING,
LMEN1 TYPE STRING,
LMEN2 TYPE STRING,
LETY1 TYPE STRING,
LETY2 TYPE STRING,
VFDAT TYPE STRING,
BDART TYPE STRING,
AUTTA TYPE STRING,
PKNUM TYPE STRING,
PKPOS TYPE STRING,
ZEUGN TYPE STRING,
QPLOA TYPE STRING,
RSART TYPE STRING,
DIRTA TYPE STRING,
KZECH TYPE STRING,
LGORT TYPE STRING,
LGNTB TYPE STRING,
L2SKR TYPE STRING,
XSTBW TYPE STRING,
KBNKZ TYPE STRING,
PKKEY TYPE STRING,
KZFME TYPE STRING,
LENUM TYPE STRING,
LETYP TYPE STRING,
VBELN TYPE STRING,
POSNR TYPE STRING,
LDUMM TYPE STRING,
XHUPF TYPE STRING,
QKAPV TYPE STRING,
LKAPA TYPE STRING,
KKAPV TYPE STRING,
MAXLE TYPE STRING,
PLPOS TYPE STRING,
STEIN TYPE STRING,
SUMME TYPE STRING,
PLAUF TYPE STRING,
SGT_SCAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LK01_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_LK01_STR-MANDT sy-vline 
WA_LK01_STR-SAKOM sy-vline 
WA_LK01_STR-LGNUM sy-vline 
WA_LK01_STR-TBNUM sy-vline 
WA_LK01_STR-TBPOS sy-vline 
WA_LK01_STR-TRART sy-vline 
WA_LK01_STR-TBPRI sy-vline 
WA_LK01_STR-TBFKZ sy-vline 
WA_LK01_STR-BNAME sy-vline 
WA_LK01_STR-MATNR sy-vline 
WA_LK01_STR-WERKS sy-vline 
WA_LK01_STR-CHARG sy-vline 
WA_LK01_STR-BESTQ sy-vline 
WA_LK01_STR-SOBKZ sy-vline 
WA_LK01_STR-SONUM sy-vline 
WA_LK01_STR-MENGE sy-vline 
WA_LK01_STR-MEINS sy-vline 
WA_LK01_STR-MENGA sy-vline 
WA_LK01_STR-ALTME sy-vline 
WA_LK01_STR-UMREZ sy-vline 
WA_LK01_STR-UMREN sy-vline 
WA_LK01_STR-WEMPF sy-vline 
WA_LK01_STR-ABLAD sy-vline 
WA_LK01_STR-WDATU sy-vline 
WA_LK01_STR-MBLNR sy-vline 
WA_LK01_STR-MJAHR sy-vline 
WA_LK01_STR-MBPOS sy-vline 
WA_LK01_STR-SMBLN sy-vline 
WA_LK01_STR-SMBLP sy-vline 
WA_LK01_STR-SJAHR sy-vline 
WA_LK01_STR-BRGEW sy-vline 
WA_LK01_STR-GEWEI sy-vline 
WA_LK01_STR-BETYP sy-vline 
WA_LK01_STR-BENUM sy-vline 
WA_LK01_STR-BWART sy-vline 
WA_LK01_STR-BWLVS sy-vline 
WA_LK01_STR-VLTYP sy-vline 
WA_LK01_STR-VLPLA sy-vline 
WA_LK01_STR-VKDYN sy-vline 
WA_LK01_STR-VSCHN sy-vline 
WA_LK01_STR-NLTYP sy-vline 
WA_LK01_STR-NLPLA sy-vline 
WA_LK01_STR-NKDYN sy-vline 
WA_LK01_STR-NSCHN sy-vline 
WA_LK01_STR-PDATU sy-vline 
WA_LK01_STR-PZEIT sy-vline 
WA_LK01_STR-KLFR2 sy-vline 
WA_LK01_STR-LQNUM sy-vline 
WA_LK01_STR-QPLOS sy-vline 
WA_LK01_STR-TBKTX sy-vline 
WA_LK01_STR-TBRUE sy-vline 
WA_LK01_STR-RSNUM sy-vline 
WA_LK01_STR-RSPOS sy-vline 
WA_LK01_STR-LZNUM sy-vline 
WA_LK01_STR-ANZL1 sy-vline 
WA_LK01_STR-ANZL2 sy-vline 
WA_LK01_STR-LMEN1 sy-vline 
WA_LK01_STR-LMEN2 sy-vline 
WA_LK01_STR-LETY1 sy-vline 
WA_LK01_STR-LETY2 sy-vline 
WA_LK01_STR-VFDAT sy-vline 
WA_LK01_STR-BDART sy-vline 
WA_LK01_STR-AUTTA sy-vline 
WA_LK01_STR-PKNUM sy-vline 
WA_LK01_STR-PKPOS sy-vline 
WA_LK01_STR-ZEUGN sy-vline 
WA_LK01_STR-QPLOA sy-vline 
WA_LK01_STR-RSART sy-vline 
WA_LK01_STR-DIRTA sy-vline 
WA_LK01_STR-KZECH sy-vline 
WA_LK01_STR-LGORT sy-vline 
WA_LK01_STR-LGNTB sy-vline 
WA_LK01_STR-L2SKR sy-vline 
WA_LK01_STR-XSTBW sy-vline 
WA_LK01_STR-KBNKZ sy-vline 
WA_LK01_STR-PKKEY sy-vline 
WA_LK01_STR-KZFME sy-vline 
WA_LK01_STR-LENUM sy-vline 
WA_LK01_STR-LETYP sy-vline 
WA_LK01_STR-VBELN sy-vline 
WA_LK01_STR-POSNR sy-vline 
WA_LK01_STR-LDUMM sy-vline 
WA_LK01_STR-XHUPF sy-vline 
WA_LK01_STR-QKAPV sy-vline 
WA_LK01_STR-LKAPA sy-vline 
WA_LK01_STR-KKAPV sy-vline 
WA_LK01_STR-MAXLE sy-vline 
WA_LK01_STR-PLPOS sy-vline 
WA_LK01_STR-STEIN sy-vline 
WA_LK01_STR-SUMME sy-vline 
WA_LK01_STR-PLAUF sy-vline 
WA_LK01_STR-SGT_SCAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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