ABAP Select data from SAP table RDS_RCVREXTR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RDS_RCVREXTR
*  INTO TABLE @DATA(IT_RDS_RCVREXTR2).
*--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_RDS_RCVREXTR INDEX 1 INTO DATA(WA_RDS_RCVREXTR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RDS_RCVREXTR>-PARTY = 1.
<RDS_RCVREXTR>-TYPE = 1.
<RDS_RCVREXTR>-VALUE = 1.
<RDS_RCVREXTR>-DATATYPE = 1.
<RDS_RCVREXTR>-COBJNS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RDS_RCVREXTR-COBJNAME, sy-vline,
  WA_RDS_RCVREXTR-MULTLINE, sy-vline,
  WA_RDS_RCVREXTR-CELEM, sy-vline,
  WA_RDS_RCVREXTR-CELEMINDX, sy-vline,
  WA_RDS_RCVREXTR-PARTYAG, sy-vline,
  WA_RDS_RCVREXTR-TYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RDS_RCVREXTR 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_RDS_RCVREXTR 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_RDS_RCVREXTR INTO WA_RDS_RCVREXTR.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_RDS_RCVREXTR_STR, 
PARTY TYPE STRING,
TYPE TYPE STRING,
VALUE TYPE STRING,
DATATYPE TYPE STRING,
COBJNS TYPE STRING,
COBJNAME TYPE STRING,
MULTLINE TYPE STRING,
CELEM TYPE STRING,
CELEMINDX TYPE STRING,
PARTYAG TYPE STRING,
TYPE TYPE STRING,
VALUE TYPE STRING,
DATATYPE TYPE STRING,
COBJNS TYPE STRING,
COBJNAME TYPE STRING,
MULTLINE TYPE STRING,
CELEM TYPE STRING,
CELEMINDX TYPE STRING,
PARTYSC TYPE STRING,
TYPE TYPE STRING,
VALUE TYPE STRING,
DATATYPE TYPE STRING,
COBJNS TYPE STRING,
COBJNAME TYPE STRING,
MULTLINE TYPE STRING,
CELEM TYPE STRING,
CELEMINDX TYPE STRING,
SERVICE TYPE STRING,
TYPE TYPE STRING,
VALUE TYPE STRING,
DATATYPE TYPE STRING,
COBJNS TYPE STRING,
COBJNAME TYPE STRING,
MULTLINE TYPE STRING,
CELEM TYPE STRING,
CELEMINDX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RDS_RCVREXTR_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_RDS_RCVREXTR_STR-PARTY sy-vline 
WA_RDS_RCVREXTR_STR-TYPE sy-vline 
WA_RDS_RCVREXTR_STR-VALUE sy-vline 
WA_RDS_RCVREXTR_STR-DATATYPE sy-vline 
WA_RDS_RCVREXTR_STR-COBJNS sy-vline 
WA_RDS_RCVREXTR_STR-COBJNAME sy-vline 
WA_RDS_RCVREXTR_STR-MULTLINE sy-vline 
WA_RDS_RCVREXTR_STR-CELEM sy-vline 
WA_RDS_RCVREXTR_STR-CELEMINDX sy-vline 
WA_RDS_RCVREXTR_STR-PARTYAG sy-vline 
WA_RDS_RCVREXTR_STR-TYPE sy-vline 
WA_RDS_RCVREXTR_STR-VALUE sy-vline 
WA_RDS_RCVREXTR_STR-DATATYPE sy-vline 
WA_RDS_RCVREXTR_STR-COBJNS sy-vline 
WA_RDS_RCVREXTR_STR-COBJNAME sy-vline 
WA_RDS_RCVREXTR_STR-MULTLINE sy-vline 
WA_RDS_RCVREXTR_STR-CELEM sy-vline 
WA_RDS_RCVREXTR_STR-CELEMINDX sy-vline 
WA_RDS_RCVREXTR_STR-PARTYSC sy-vline 
WA_RDS_RCVREXTR_STR-TYPE sy-vline 
WA_RDS_RCVREXTR_STR-VALUE sy-vline 
WA_RDS_RCVREXTR_STR-DATATYPE sy-vline 
WA_RDS_RCVREXTR_STR-COBJNS sy-vline 
WA_RDS_RCVREXTR_STR-COBJNAME sy-vline 
WA_RDS_RCVREXTR_STR-MULTLINE sy-vline 
WA_RDS_RCVREXTR_STR-CELEM sy-vline 
WA_RDS_RCVREXTR_STR-CELEMINDX sy-vline 
WA_RDS_RCVREXTR_STR-SERVICE sy-vline 
WA_RDS_RCVREXTR_STR-TYPE sy-vline 
WA_RDS_RCVREXTR_STR-VALUE sy-vline 
WA_RDS_RCVREXTR_STR-DATATYPE sy-vline 
WA_RDS_RCVREXTR_STR-COBJNS sy-vline 
WA_RDS_RCVREXTR_STR-COBJNAME sy-vline 
WA_RDS_RCVREXTR_STR-MULTLINE sy-vline 
WA_RDS_RCVREXTR_STR-CELEM sy-vline 
WA_RDS_RCVREXTR_STR-CELEMINDX sy-vline      INTO ld_text SEPARATED BY SPACE.

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