ABAP Select data from SAP table LRFA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM LRFA
*  INTO TABLE @DATA(IT_LRFA2).
*--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_LRFA INDEX 1 INTO DATA(WA_LRFA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<LRFA>-MANDT = 1.
<LRFA>-LGNUM = 1.
<LRFA>-REFNR = 1.
<LRFA>-REFNT = 1.
<LRFA>-RBTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_LRFA-KZSPE, sy-vline,
  WA_LRFA-KZAKT, sy-vline,
  WA_LRFA-KZDRU, sy-vline,
  WA_LRFA-DATUM, sy-vline,
  WA_LRFA-DRUKZ, sy-vline,
  WA_LRFA-LDEST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_LRFA 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_LRFA 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_LRFA INTO WA_LRFA.


*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 REFNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_LRFA-REFNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LRFA-REFNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SPDEV, internal->external for field LDEST
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_LRFA-LDEST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LRFA-LDEST.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit TSHME, internal->external for field RLSDT
CALL FUNCTION 'CONVERSION_EXIT_TSHME_OUTPUT'
  EXPORTING
    input =                      WA_LRFA-RLSDT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LRFA-RLSDT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TSHME, internal->external for field LRLSD
CALL FUNCTION 'CONVERSION_EXIT_TSHME_OUTPUT'
  EXPORTING
    input =                      WA_LRFA-LRLSD
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_LRFA-LRLSD.
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_LRFA_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
REFNR TYPE STRING,
REFNT TYPE STRING,
RBTYP TYPE STRING,
KZSPE TYPE STRING,
KZAKT TYPE STRING,
KZDRU TYPE STRING,
DATUM TYPE STRING,
DRUKZ TYPE STRING,
LDEST TYPE STRING,
DRDAT TYPE STRING,
KZKOM TYPE STRING,
KZERL TYPE STRING,
SAMMG TYPE STRING,
KWPRO TYPE STRING,
KAPTP TYPE STRING,
L2SKR TYPE STRING,
L2SKM TYPE STRING,
L2SKP TYPE STRING,
TRART TYPE STRING,
CDSTO TYPE STRING,
RLSDT TYPE STRING,
LRLSD TYPE STRING,
AZGES TYPE STRING,
AZBEA TYPE STRING,
KREUZ TYPE STRING,
TANUV TYPE STRING,
TANUB TYPE STRING,
AZTAK TYPE STRING,
AZTAP TYPE STRING,
AZRBO TYPE STRING,
AZRBF TYPE STRING,
AZRBE TYPE STRING,
KZRBF TYPE STRING,
AZERL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_LRFA_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_LRFA_STR-MANDT sy-vline 
WA_LRFA_STR-LGNUM sy-vline 
WA_LRFA_STR-REFNR sy-vline 
WA_LRFA_STR-REFNT sy-vline 
WA_LRFA_STR-RBTYP sy-vline 
WA_LRFA_STR-KZSPE sy-vline 
WA_LRFA_STR-KZAKT sy-vline 
WA_LRFA_STR-KZDRU sy-vline 
WA_LRFA_STR-DATUM sy-vline 
WA_LRFA_STR-DRUKZ sy-vline 
WA_LRFA_STR-LDEST sy-vline 
WA_LRFA_STR-DRDAT sy-vline 
WA_LRFA_STR-KZKOM sy-vline 
WA_LRFA_STR-KZERL sy-vline 
WA_LRFA_STR-SAMMG sy-vline 
WA_LRFA_STR-KWPRO sy-vline 
WA_LRFA_STR-KAPTP sy-vline 
WA_LRFA_STR-L2SKR sy-vline 
WA_LRFA_STR-L2SKM sy-vline 
WA_LRFA_STR-L2SKP sy-vline 
WA_LRFA_STR-TRART sy-vline 
WA_LRFA_STR-CDSTO sy-vline 
WA_LRFA_STR-RLSDT sy-vline 
WA_LRFA_STR-LRLSD sy-vline 
WA_LRFA_STR-AZGES sy-vline 
WA_LRFA_STR-AZBEA sy-vline 
WA_LRFA_STR-KREUZ sy-vline 
WA_LRFA_STR-TANUV sy-vline 
WA_LRFA_STR-TANUB sy-vline 
WA_LRFA_STR-AZTAK sy-vline 
WA_LRFA_STR-AZTAP sy-vline 
WA_LRFA_STR-AZRBO sy-vline 
WA_LRFA_STR-AZRBF sy-vline 
WA_LRFA_STR-AZRBE sy-vline 
WA_LRFA_STR-KZRBF sy-vline 
WA_LRFA_STR-AZERL sy-vline      INTO ld_text SEPARATED BY SPACE.

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