ABAP Select data from SAP table BAPIP0021LNL into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BAPIP0021LNL 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 BAPIP0021LNL. 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 BAPIP0021LNL 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_BAPIP0021LNL TYPE STANDARD TABLE OF BAPIP0021LNL,
      WA_BAPIP0021LNL TYPE BAPIP0021LNL,
      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: <BAPIP0021LNL> TYPE BAPIP0021LNL.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_BAPIP0021LNL.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM BAPIP0021LNL
  INTO TABLE IT_BAPIP0021LNL.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BAPIP0021LNL
*  INTO TABLE @DATA(IT_BAPIP0021LNL2).
*--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_BAPIP0021LNL INDEX 1 INTO DATA(WA_BAPIP0021LNL2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_BAPIP0021LNL ASSIGNING <BAPIP0021LNL>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BAPIP0021LNL>-EMPLOYEENO = 1.
<BAPIP0021LNL>-SUBTYPE = 1.
<BAPIP0021LNL>-OBJECTID = 1.
<BAPIP0021LNL>-LOCKINDIC = 1.
<BAPIP0021LNL>-VALIDEND = 1.

ENDLOOP.

LOOP AT IT_BAPIP0021LNL INTO WA_BAPIP0021LNL.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BAPIP0021LNL-VALIDBEGIN, sy-vline,
  WA_BAPIP0021LNL-RECORDNR, sy-vline,
  WA_BAPIP0021LNL-FAMSA, sy-vline,
  WA_BAPIP0021LNL-FGBDT, sy-vline,
  WA_BAPIP0021LNL-FGBLD, sy-vline,
  WA_BAPIP0021LNL-FANAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BAPIP0021LNL 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_BAPIP0021LNL 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_BAPIP0021LNL INTO WA_BAPIP0021LNL.


*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 PDATE, internal->external for field FGBDT
CALL FUNCTION 'CONVERSION_EXIT_PDATE_OUTPUT'
  EXPORTING
    input =                      WA_BAPIP0021LNL-FGBDT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPIP0021LNL-FGBDT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AHVNR, internal->external for field AHVNR
CALL FUNCTION 'CONVERSION_EXIT_AHVNR_OUTPUT'
  EXPORTING
    input =                      WA_BAPIP0021LNL-AHVNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPIP0021LNL-AHVNR.
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_BAPIP0021LNL_STR, 
EMPLOYEENO TYPE STRING,
SUBTYPE TYPE STRING,
OBJECTID TYPE STRING,
LOCKINDIC TYPE STRING,
VALIDEND TYPE STRING,
VALIDBEGIN TYPE STRING,
RECORDNR TYPE STRING,
FAMSA TYPE STRING,
FGBDT TYPE STRING,
FGBLD TYPE STRING,
FANAT TYPE STRING,
FASEX TYPE STRING,
FAVOR TYPE STRING,
FANAM TYPE STRING,
FGBOT TYPE STRING,
FGDEP TYPE STRING,
ERBNR TYPE STRING,
FGBNA TYPE STRING,
FNAC2 TYPE STRING,
FCNAM TYPE STRING,
FKNZN TYPE STRING,
FINIT TYPE STRING,
FVRSW TYPE STRING,
FVRS2 TYPE STRING,
FNMZU TYPE STRING,
AHVNR TYPE STRING,
KDSVH TYPE STRING,
KDBSL TYPE STRING,
KDUTB TYPE STRING,
KDGBR TYPE STRING,
KDART TYPE STRING,
KDZUG TYPE STRING,
KDZUL TYPE STRING,
KDVBE TYPE STRING,
ERMNR TYPE STRING,
AUSVL TYPE STRING,
AUSVG TYPE STRING,
FASDT TYPE STRING,
FASAR TYPE STRING,
FASIN TYPE STRING,
EGAGA TYPE STRING,
FANA2 TYPE STRING,
FANA3 TYPE STRING,
BETRG TYPE STRING,
TITEL TYPE STRING,
EMRGN TYPE STRING,
NAMEOFGESCH TYPE STRING,
NAMEOFGBDEP TYPE STRING,
NAMEOFGBLND TYPE STRING,
NAMEOFNATIO TYPE STRING,
NAMEOFNATI2 TYPE STRING,
NAMEOFNATI3 TYPE STRING,
NAMEOFFAMSA TYPE STRING,
DELIMIT_DATE TYPE STRING,
ZKVGP TYPE STRING,
PKLAS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BAPIP0021LNL_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_BAPIP0021LNL_STR-EMPLOYEENO sy-vline 
WA_BAPIP0021LNL_STR-SUBTYPE sy-vline 
WA_BAPIP0021LNL_STR-OBJECTID sy-vline 
WA_BAPIP0021LNL_STR-LOCKINDIC sy-vline 
WA_BAPIP0021LNL_STR-VALIDEND sy-vline 
WA_BAPIP0021LNL_STR-VALIDBEGIN sy-vline 
WA_BAPIP0021LNL_STR-RECORDNR sy-vline 
WA_BAPIP0021LNL_STR-FAMSA sy-vline 
WA_BAPIP0021LNL_STR-FGBDT sy-vline 
WA_BAPIP0021LNL_STR-FGBLD sy-vline 
WA_BAPIP0021LNL_STR-FANAT sy-vline 
WA_BAPIP0021LNL_STR-FASEX sy-vline 
WA_BAPIP0021LNL_STR-FAVOR sy-vline 
WA_BAPIP0021LNL_STR-FANAM sy-vline 
WA_BAPIP0021LNL_STR-FGBOT sy-vline 
WA_BAPIP0021LNL_STR-FGDEP sy-vline 
WA_BAPIP0021LNL_STR-ERBNR sy-vline 
WA_BAPIP0021LNL_STR-FGBNA sy-vline 
WA_BAPIP0021LNL_STR-FNAC2 sy-vline 
WA_BAPIP0021LNL_STR-FCNAM sy-vline 
WA_BAPIP0021LNL_STR-FKNZN sy-vline 
WA_BAPIP0021LNL_STR-FINIT sy-vline 
WA_BAPIP0021LNL_STR-FVRSW sy-vline 
WA_BAPIP0021LNL_STR-FVRS2 sy-vline 
WA_BAPIP0021LNL_STR-FNMZU sy-vline 
WA_BAPIP0021LNL_STR-AHVNR sy-vline 
WA_BAPIP0021LNL_STR-KDSVH sy-vline 
WA_BAPIP0021LNL_STR-KDBSL sy-vline 
WA_BAPIP0021LNL_STR-KDUTB sy-vline 
WA_BAPIP0021LNL_STR-KDGBR sy-vline 
WA_BAPIP0021LNL_STR-KDART sy-vline 
WA_BAPIP0021LNL_STR-KDZUG sy-vline 
WA_BAPIP0021LNL_STR-KDZUL sy-vline 
WA_BAPIP0021LNL_STR-KDVBE sy-vline 
WA_BAPIP0021LNL_STR-ERMNR sy-vline 
WA_BAPIP0021LNL_STR-AUSVL sy-vline 
WA_BAPIP0021LNL_STR-AUSVG sy-vline 
WA_BAPIP0021LNL_STR-FASDT sy-vline 
WA_BAPIP0021LNL_STR-FASAR sy-vline 
WA_BAPIP0021LNL_STR-FASIN sy-vline 
WA_BAPIP0021LNL_STR-EGAGA sy-vline 
WA_BAPIP0021LNL_STR-FANA2 sy-vline 
WA_BAPIP0021LNL_STR-FANA3 sy-vline 
WA_BAPIP0021LNL_STR-BETRG sy-vline 
WA_BAPIP0021LNL_STR-TITEL sy-vline 
WA_BAPIP0021LNL_STR-EMRGN sy-vline 
WA_BAPIP0021LNL_STR-NAMEOFGESCH sy-vline 
WA_BAPIP0021LNL_STR-NAMEOFGBDEP sy-vline 
WA_BAPIP0021LNL_STR-NAMEOFGBLND sy-vline 
WA_BAPIP0021LNL_STR-NAMEOFNATIO sy-vline 
WA_BAPIP0021LNL_STR-NAMEOFNATI2 sy-vline 
WA_BAPIP0021LNL_STR-NAMEOFNATI3 sy-vline 
WA_BAPIP0021LNL_STR-NAMEOFFAMSA sy-vline 
WA_BAPIP0021LNL_STR-DELIMIT_DATE sy-vline 
WA_BAPIP0021LNL_STR-ZKVGP sy-vline 
WA_BAPIP0021LNL_STR-PKLAS sy-vline      INTO ld_text SEPARATED BY SPACE.

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