ABAP Select data from SAP table LFINF_D into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LFINF_D
*  INTO TABLE @DATA(IT_LFINF_D2).
*--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_LFINF_D INDEX 1 INTO DATA(WA_LFINF_D2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LFINF_D>-MANDT = 1.
<LFINF_D>-LINFN = 1.
<LFINF_D>-PSPNR = 1.
<LFINF_D>-VSTEL = 1.
<LFINF_D>-VKORG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LFINF_D-VTWEG, sy-vline,
  WA_LFINF_D-SPART, sy-vline,
  WA_LFINF_D-KUNNR, sy-vline,
  WA_LFINF_D-ADRNR, sy-vline,
  WA_LFINF_D-LFDAT, sy-vline,
  WA_LFINF_D-WADAT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LFINF_D 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_LFINF_D 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_LFINF_D INTO WA_LFINF_D.


*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 PSPNR
CALL FUNCTION 'CONVERSION_EXIT_KONPD_OUTPUT'
  EXPORTING
    input =                      WA_LFINF_D-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LFINF_D-PSPNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

*Conversion exit ALPHA, internal->external for field ADRN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LFINF_D-ADRN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LFINF_D-ADRN2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSN, internal->external for field PSPID
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_LFINF_D-PSPID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LFINF_D-PSPID.
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_LFINF_D_STR, 
MANDT TYPE STRING,
LINFN TYPE STRING,
PSPNR TYPE STRING,
VSTEL TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
KUNNR TYPE STRING,
ADRNR TYPE STRING,
LFDAT TYPE STRING,
WADAT TYPE STRING,
LOEKZ TYPE STRING,
PS_PSP_PNR TYPE STRING,
LIFWA TYPE STRING,
ADRN2 TYPE STRING,
PSPID TYPE STRING,
LINFN_VOR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LFINF_D_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_LFINF_D_STR-MANDT sy-vline 
WA_LFINF_D_STR-LINFN sy-vline 
WA_LFINF_D_STR-PSPNR sy-vline 
WA_LFINF_D_STR-VSTEL sy-vline 
WA_LFINF_D_STR-VKORG sy-vline 
WA_LFINF_D_STR-VTWEG sy-vline 
WA_LFINF_D_STR-SPART sy-vline 
WA_LFINF_D_STR-KUNNR sy-vline 
WA_LFINF_D_STR-ADRNR sy-vline 
WA_LFINF_D_STR-LFDAT sy-vline 
WA_LFINF_D_STR-WADAT sy-vline 
WA_LFINF_D_STR-LOEKZ sy-vline 
WA_LFINF_D_STR-PS_PSP_PNR sy-vline 
WA_LFINF_D_STR-LIFWA sy-vline 
WA_LFINF_D_STR-ADRN2 sy-vline 
WA_LFINF_D_STR-PSPID sy-vline 
WA_LFINF_D_STR-LINFN_VOR sy-vline      INTO ld_text SEPARATED BY SPACE.

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