ABAP Select data from SAP table RELM_LR_RE_REGISTER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RELM_LR_RE_REGISTER
*  INTO TABLE @DATA(IT_RELM_LR_RE_REGISTER2).
*--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_RELM_LR_RE_REGISTER INDEX 1 INTO DATA(WA_RELM_LR_RE_REGISTER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RELM_LR_RE_REGISTER>-MANDT = 1.
<RELM_LR_RE_REGISTER>-INTRENO = 1.
<RELM_LR_RE_REGISTER>-LRREGNO = 1.
<RELM_LR_RE_REGISTER>-LRREGSUBNO = 1.
<RELM_LR_RE_REGISTER>-COOWNERNUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RELM_LR_RE_REGISTER-COOWNERDENOM, sy-vline,
  WA_RELM_LR_RE_REGISTER-RPRGNO, sy-vline,
  WA_RELM_LR_RE_REGISTER-LRMEASVALUE, sy-vline,
  WA_RELM_LR_RE_REGISTER-MEASUNIT, sy-vline,
  WA_RELM_LR_RE_REGISTER-APPLICATIONDATE, sy-vline,
  WA_RELM_LR_RE_REGISTER-ENTRYDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RELM_LR_RE_REGISTER 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_RELM_LR_RE_REGISTER 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_RELM_LR_RE_REGISTER INTO WA_RELM_LR_RE_REGISTER.


*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 LRREG, internal->external for field LRREGNO
CALL FUNCTION 'CONVERSION_EXIT_LRREG_OUTPUT'
  EXPORTING
    input =                      WA_RELM_LR_RE_REGISTER-LRREGNO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RELM_LR_RE_REGISTER-LRREGNO.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit REDAT, internal->external for field CANCELDATE
CALL FUNCTION 'CONVERSION_EXIT_REDAT_OUTPUT'
  EXPORTING
    input =                      WA_RELM_LR_RE_REGISTER-CANCELDATE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RELM_LR_RE_REGISTER-CANCELDATE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LRPGN, internal->external for field HERITLRPAGENO
CALL FUNCTION 'CONVERSION_EXIT_LRPGN_OUTPUT'
  EXPORTING
    input =                      WA_RELM_LR_RE_REGISTER-HERITLRPAGENO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RELM_LR_RE_REGISTER-HERITLRPAGENO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit LRSEC, internal->external for field HERITSEC2NO
CALL FUNCTION 'CONVERSION_EXIT_LRSEC_OUTPUT'
  EXPORTING
    input =                      WA_RELM_LR_RE_REGISTER-HERITSEC2NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RELM_LR_RE_REGISTER-HERITSEC2NO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field HERITOWNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RELM_LR_RE_REGISTER-HERITOWNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RELM_LR_RE_REGISTER-HERITOWNER.
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_RELM_LR_RE_REGISTER_STR, 
MANDT TYPE STRING,
INTRENO TYPE STRING,
LRREGNO TYPE STRING,
LRREGSUBNO TYPE STRING,
COOWNERNUM TYPE STRING,
COOWNERDENOM TYPE STRING,
RPRGNO TYPE STRING,
LRMEASVALUE TYPE STRING,
MEASUNIT TYPE STRING,
APPLICATIONDATE TYPE STRING,
ENTRYDATE TYPE STRING,
APPROVALDATE TYPE STRING,
CANCELDATE TYPE STRING,
XCOMMENT TYPE STRING,
HERITLRDISTRICT TYPE STRING,
HERITLRVOLUMENO TYPE STRING,
HERITLRPAGENO TYPE STRING,
HERITSEC2NO TYPE STRING,
HERITOWNER TYPE STRING,
HERITFIXTERMDATE TYPE STRING,
HERITTERM TYPE STRING,
ISDOMTENENTRY TYPE STRING,
DOMTENENTRYDATE TYPE STRING,
ENCUMBRANCETYPE TYPE STRING,
PLEXTIDENTKEY TYPE STRING,
PLOBJNR TYPE STRING,
PLEXTIDENTKEYL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RELM_LR_RE_REGISTER_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_RELM_LR_RE_REGISTER_STR-MANDT sy-vline 
WA_RELM_LR_RE_REGISTER_STR-INTRENO sy-vline 
WA_RELM_LR_RE_REGISTER_STR-LRREGNO sy-vline 
WA_RELM_LR_RE_REGISTER_STR-LRREGSUBNO sy-vline 
WA_RELM_LR_RE_REGISTER_STR-COOWNERNUM sy-vline 
WA_RELM_LR_RE_REGISTER_STR-COOWNERDENOM sy-vline 
WA_RELM_LR_RE_REGISTER_STR-RPRGNO sy-vline 
WA_RELM_LR_RE_REGISTER_STR-LRMEASVALUE sy-vline 
WA_RELM_LR_RE_REGISTER_STR-MEASUNIT sy-vline 
WA_RELM_LR_RE_REGISTER_STR-APPLICATIONDATE sy-vline 
WA_RELM_LR_RE_REGISTER_STR-ENTRYDATE sy-vline 
WA_RELM_LR_RE_REGISTER_STR-APPROVALDATE sy-vline 
WA_RELM_LR_RE_REGISTER_STR-CANCELDATE sy-vline 
WA_RELM_LR_RE_REGISTER_STR-XCOMMENT sy-vline 
WA_RELM_LR_RE_REGISTER_STR-HERITLRDISTRICT sy-vline 
WA_RELM_LR_RE_REGISTER_STR-HERITLRVOLUMENO sy-vline 
WA_RELM_LR_RE_REGISTER_STR-HERITLRPAGENO sy-vline 
WA_RELM_LR_RE_REGISTER_STR-HERITSEC2NO sy-vline 
WA_RELM_LR_RE_REGISTER_STR-HERITOWNER sy-vline 
WA_RELM_LR_RE_REGISTER_STR-HERITFIXTERMDATE sy-vline 
WA_RELM_LR_RE_REGISTER_STR-HERITTERM sy-vline 
WA_RELM_LR_RE_REGISTER_STR-ISDOMTENENTRY sy-vline 
WA_RELM_LR_RE_REGISTER_STR-DOMTENENTRYDATE sy-vline 
WA_RELM_LR_RE_REGISTER_STR-ENCUMBRANCETYPE sy-vline 
WA_RELM_LR_RE_REGISTER_STR-PLEXTIDENTKEY sy-vline 
WA_RELM_LR_RE_REGISTER_STR-PLOBJNR sy-vline 
WA_RELM_LR_RE_REGISTER_STR-PLEXTIDENTKEYL sy-vline      INTO ld_text SEPARATED BY SPACE.

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