ABAP Select data from SAP table LXDCK_TO_CANDIDATE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LXDCK_TO_CANDIDATE
*  INTO TABLE @DATA(IT_LXDCK_TO_CANDIDATE2).
*--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_LXDCK_TO_CANDIDATE INDEX 1 INTO DATA(WA_LXDCK_TO_CANDIDATE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LXDCK_TO_CANDIDATE>-LGNUM = 1.
<LXDCK_TO_CANDIDATE>-TANUM = 1.
<LXDCK_TO_CANDIDATE>-TAPOS = 1.
<LXDCK_TO_CANDIDATE>-VBELN = 1.
<LXDCK_TO_CANDIDATE>-POSNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LXDCK_TO_CANDIDATE-TBNUM, sy-vline,
  WA_LXDCK_TO_CANDIDATE-TBPOS, sy-vline,
  WA_LXDCK_TO_CANDIDATE-QTYTO, sy-vline,
  WA_LXDCK_TO_CANDIDATE-MEINS, sy-vline,
  WA_LXDCK_TO_CANDIDATE-STTYP, sy-vline,
  WA_LXDCK_TO_CANDIDATE-STBIN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LXDCK_TO_CANDIDATE 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_LXDCK_TO_CANDIDATE 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_LXDCK_TO_CANDIDATE INTO WA_LXDCK_TO_CANDIDATE.


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

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

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

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

*Conversion exit ALPHA, internal->external for field SONUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LXDCK_TO_CANDIDATE-SONUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LXDCK_TO_CANDIDATE-SONUM.
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_LXDCK_TO_CANDIDATE_STR, 
LGNUM TYPE STRING,
TANUM TYPE STRING,
TAPOS TYPE STRING,
VBELN TYPE STRING,
POSNR TYPE STRING,
TBNUM TYPE STRING,
TBPOS TYPE STRING,
QTYTO TYPE STRING,
MEINS TYPE STRING,
STTYP TYPE STRING,
STBIN TYPE STRING,
STUNT TYPE STRING,
QNTNR TYPE STRING,
BWLVS TYPE STRING,
DYBIN TYPE STRING,
CHOSEN TYPE STRING,
SRCQT TYPE STRING,
WDATU TYPE STRING,
VFDAT TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
LGORT TYPE STRING,
SOBKZ TYPE STRING,
SONUM TYPE STRING,
CHARG TYPE STRING,
BESTQ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LXDCK_TO_CANDIDATE_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_LXDCK_TO_CANDIDATE_STR-LGNUM sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-TANUM sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-TAPOS sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-VBELN sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-POSNR sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-TBNUM sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-TBPOS sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-QTYTO sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-MEINS sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-STTYP sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-STBIN sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-STUNT sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-QNTNR sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-BWLVS sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-DYBIN sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-CHOSEN sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-SRCQT sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-WDATU sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-VFDAT sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-MATNR sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-WERKS sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-LGORT sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-SOBKZ sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-SONUM sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-CHARG sy-vline 
WA_LXDCK_TO_CANDIDATE_STR-BESTQ sy-vline      INTO ld_text SEPARATED BY SPACE.

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