ABAP Select data from SAP table RLDRU 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 RLDRU 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 RLDRU. 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 RLDRU 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_RLDRU TYPE STANDARD TABLE OF RLDRU,
      WA_RLDRU TYPE RLDRU,
      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: <RLDRU> TYPE RLDRU.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RLDRU
*  INTO TABLE @DATA(IT_RLDRU2).
*--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_RLDRU INDEX 1 INTO DATA(WA_RLDRU2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RLDRU>-TANUM = 1.
<RLDRU>-TAPOS = 1.
<RLDRU>-GVTX1 = 1.
<RLDRU>-GVTX2 = 1.
<RLDRU>-GVTX3 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RLDRU-GVTX4, sy-vline,
  WA_RLDRU-GVTX5, sy-vline,
  WA_RLDRU-GVTX6, sy-vline,
  WA_RLDRU-GVTX7, sy-vline,
  WA_RLDRU-GVTX8, sy-vline,
  WA_RLDRU-TALGN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RLDRU 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_RLDRU 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_RLDRU INTO WA_RLDRU.


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

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

*Conversion exit ALPHA, internal->external for field REFMAX
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RLDRU-REFMAX
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RLDRU-REFMAX.
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_RLDRU_STR, 
TANUM TYPE STRING,
TAPOS TYPE STRING,
GVTX1 TYPE STRING,
GVTX2 TYPE STRING,
GVTX3 TYPE STRING,
GVTX4 TYPE STRING,
GVTX5 TYPE STRING,
GVTX6 TYPE STRING,
GVTX7 TYPE STRING,
GVTX8 TYPE STRING,
TALGN TYPE STRING,
TAPLG TYPE STRING,
KZMEM TYPE STRING,
DRUKZ TYPE STRING,
TEXT1 TYPE STRING,
TEXT2 TYPE STRING,
WIEDR TYPE STRING,
BETXT TYPE STRING,
RFLGN TYPE STRING,
RFLTN TYPE STRING,
LDEST TYPE STRING,
SPOOL TYPE STRING,
TASCH TYPE STRING,
LESCH TYPE STRING,
LETAS TYPE STRING,
LEINH TYPE STRING,
GEMTA TYPE STRING,
FTADA TYPE STRING,
DRUCK TYPE STRING,
PROTO TYPE STRING,
MENGE TYPE STRING,
MEINH TYPE STRING,
TAPOB TYPE STRING,
AUSDR TYPE STRING,
GRUIG TYPE STRING,
KPUNK TYPE STRING,
REFMAX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RLDRU_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_RLDRU_STR-TANUM sy-vline 
WA_RLDRU_STR-TAPOS sy-vline 
WA_RLDRU_STR-GVTX1 sy-vline 
WA_RLDRU_STR-GVTX2 sy-vline 
WA_RLDRU_STR-GVTX3 sy-vline 
WA_RLDRU_STR-GVTX4 sy-vline 
WA_RLDRU_STR-GVTX5 sy-vline 
WA_RLDRU_STR-GVTX6 sy-vline 
WA_RLDRU_STR-GVTX7 sy-vline 
WA_RLDRU_STR-GVTX8 sy-vline 
WA_RLDRU_STR-TALGN sy-vline 
WA_RLDRU_STR-TAPLG sy-vline 
WA_RLDRU_STR-KZMEM sy-vline 
WA_RLDRU_STR-DRUKZ sy-vline 
WA_RLDRU_STR-TEXT1 sy-vline 
WA_RLDRU_STR-TEXT2 sy-vline 
WA_RLDRU_STR-WIEDR sy-vline 
WA_RLDRU_STR-BETXT sy-vline 
WA_RLDRU_STR-RFLGN sy-vline 
WA_RLDRU_STR-RFLTN sy-vline 
WA_RLDRU_STR-LDEST sy-vline 
WA_RLDRU_STR-SPOOL sy-vline 
WA_RLDRU_STR-TASCH sy-vline 
WA_RLDRU_STR-LESCH sy-vline 
WA_RLDRU_STR-LETAS sy-vline 
WA_RLDRU_STR-LEINH sy-vline 
WA_RLDRU_STR-GEMTA sy-vline 
WA_RLDRU_STR-FTADA sy-vline 
WA_RLDRU_STR-DRUCK sy-vline 
WA_RLDRU_STR-PROTO sy-vline 
WA_RLDRU_STR-MENGE sy-vline 
WA_RLDRU_STR-MEINH sy-vline 
WA_RLDRU_STR-TAPOB sy-vline 
WA_RLDRU_STR-AUSDR sy-vline 
WA_RLDRU_STR-GRUIG sy-vline 
WA_RLDRU_STR-KPUNK sy-vline 
WA_RLDRU_STR-REFMAX sy-vline      INTO ld_text SEPARATED BY SPACE.

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