ABAP Select data from SAP table LFOBJ 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 LFOBJ 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 LFOBJ. 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 LFOBJ 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_LFOBJ TYPE STANDARD TABLE OF LFOBJ,
      WA_LFOBJ TYPE LFOBJ,
      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: <LFOBJ> TYPE LFOBJ.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LFOBJ
*  INTO TABLE @DATA(IT_LFOBJ2).
*--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_LFOBJ INDEX 1 INTO DATA(WA_LFOBJ2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LFOBJ>-OBJNR = 1.
<LFOBJ>-PSPHI = 1.
<LFOBJ>-PSPNR2 = 1.
<LFOBJ>-POSID = 1.
<LFOBJ>-AUFPL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LFOBJ-APLZL, sy-vline,
  WA_LFOBJ-AUFNR, sy-vline,
  WA_LFOBJ-NETZKONT, sy-vline,
  WA_LFOBJ-VORNR, sy-vline,
  WA_LFOBJ-RSNUM, sy-vline,
  WA_LFOBJ-RSPOS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LFOBJ 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_LFOBJ 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_LFOBJ INTO WA_LFOBJ.


*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 KONPD, internal->external for field PSPHI
CALL FUNCTION 'CONVERSION_EXIT_KONPD_OUTPUT'
  EXPORTING
    input =                      WA_LFOBJ-PSPHI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LFOBJ-PSPHI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PSPNR2
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_LFOBJ-PSPNR2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LFOBJ-PSPNR2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSN, internal->external for field POSID
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_LFOBJ-POSID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LFOBJ-POSID.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit NUMCV, internal->external for field VORNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_LFOBJ-VORNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LFOBJ-VORNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field POSNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_LFOBJ-POSNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LFOBJ-POSNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_LFOBJ-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LFOBJ-MATNR.
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_LFOBJ_STR, 
OBJNR TYPE STRING,
PSPHI TYPE STRING,
PSPNR2 TYPE STRING,
POSID TYPE STRING,
AUFPL TYPE STRING,
APLZL TYPE STRING,
AUFNR TYPE STRING,
NETZKONT TYPE STRING,
VORNR TYPE STRING,
RSNUM TYPE STRING,
RSPOS TYPE STRING,
POSNR TYPE STRING,
MATNR TYPE STRING,
TRTYP TYPE STRING,
LOEVM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LFOBJ_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_LFOBJ_STR-OBJNR sy-vline 
WA_LFOBJ_STR-PSPHI sy-vline 
WA_LFOBJ_STR-PSPNR2 sy-vline 
WA_LFOBJ_STR-POSID sy-vline 
WA_LFOBJ_STR-AUFPL sy-vline 
WA_LFOBJ_STR-APLZL sy-vline 
WA_LFOBJ_STR-AUFNR sy-vline 
WA_LFOBJ_STR-NETZKONT sy-vline 
WA_LFOBJ_STR-VORNR sy-vline 
WA_LFOBJ_STR-RSNUM sy-vline 
WA_LFOBJ_STR-RSPOS sy-vline 
WA_LFOBJ_STR-POSNR sy-vline 
WA_LFOBJ_STR-MATNR sy-vline 
WA_LFOBJ_STR-TRTYP sy-vline 
WA_LFOBJ_STR-LOEVM sy-vline      INTO ld_text SEPARATED BY SPACE.

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