ABAP Select data from SAP table RNDAE 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 RNDAE 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 RNDAE. 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 RNDAE 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_RNDAE TYPE STANDARD TABLE OF RNDAE,
      WA_RNDAE TYPE RNDAE,
      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: <RNDAE> TYPE RNDAE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNDAE
*  INTO TABLE @DATA(IT_RNDAE2).
*--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_RNDAE INDEX 1 INTO DATA(WA_RNDAE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNDAE>-MANDT = 1.
<RNDAE>-DOKAR = 1.
<RNDAE>-DOKNR = 1.
<RNDAE>-DOKVR = 1.
<RNDAE>-DOKTL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNDAE-ENTLEIHER, sy-vline,
  WA_RNDAE-ENTLTYP, sy-vline,
  WA_RNDAE-LEIHDAT, sy-vline,
  WA_RNDAE-LEIZEIT, sy-vline,
  WA_RNDAE-ORGKR, sy-vline,
  WA_RNDAE-ENTZW, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNDAE 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_RNDAE 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_RNDAE INTO WA_RNDAE.


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

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

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

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

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

*Conversion exit ALPHA, internal->external for field VERANTW
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNDAE-VERANTW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNDAE-VERANTW.
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_RNDAE_STR, 
MANDT TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKVR TYPE STRING,
DOKTL TYPE STRING,
ENTLEIHER TYPE STRING,
ENTLTYP TYPE STRING,
LEIHDAT TYPE STRING,
LEIZEIT TYPE STRING,
ORGKR TYPE STRING,
ENTZW TYPE STRING,
RUEKDAT TYPE STRING,
STATUS TYPE STRING,
ANZMAH TYPE STRING,
ERMAHN TYPE STRING,
LEMAHN TYPE STRING,
ENTTEXT TYPE STRING,
LGTXT TYPE STRING,
ERDAT TYPE STRING,
ERUSR TYPE STRING,
UPDAT TYPE STRING,
UPUSR TYPE STRING,
ENTLEND TYPE STRING,
VERANTW TYPE STRING,
ERTIM TYPE STRING,
FILEMR TYPE STRING,
UPDKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNDAE_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_RNDAE_STR-MANDT sy-vline 
WA_RNDAE_STR-DOKAR sy-vline 
WA_RNDAE_STR-DOKNR sy-vline 
WA_RNDAE_STR-DOKVR sy-vline 
WA_RNDAE_STR-DOKTL sy-vline 
WA_RNDAE_STR-ENTLEIHER sy-vline 
WA_RNDAE_STR-ENTLTYP sy-vline 
WA_RNDAE_STR-LEIHDAT sy-vline 
WA_RNDAE_STR-LEIZEIT sy-vline 
WA_RNDAE_STR-ORGKR sy-vline 
WA_RNDAE_STR-ENTZW sy-vline 
WA_RNDAE_STR-RUEKDAT sy-vline 
WA_RNDAE_STR-STATUS sy-vline 
WA_RNDAE_STR-ANZMAH sy-vline 
WA_RNDAE_STR-ERMAHN sy-vline 
WA_RNDAE_STR-LEMAHN sy-vline 
WA_RNDAE_STR-ENTTEXT sy-vline 
WA_RNDAE_STR-LGTXT sy-vline 
WA_RNDAE_STR-ERDAT sy-vline 
WA_RNDAE_STR-ERUSR sy-vline 
WA_RNDAE_STR-UPDAT sy-vline 
WA_RNDAE_STR-UPUSR sy-vline 
WA_RNDAE_STR-ENTLEND sy-vline 
WA_RNDAE_STR-VERANTW sy-vline 
WA_RNDAE_STR-ERTIM sy-vline 
WA_RNDAE_STR-FILEMR sy-vline 
WA_RNDAE_STR-UPDKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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