ABAP Select data from SAP table R2RLEDLV_HD_REF into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP R2RLEDLV_HD_REF 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 R2RLEDLV_HD_REF. 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 R2RLEDLV_HD_REF 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_R2RLEDLV_HD_REF TYPE STANDARD TABLE OF R2RLEDLV_HD_REF,
      WA_R2RLEDLV_HD_REF TYPE R2RLEDLV_HD_REF,
      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: <R2RLEDLV_HD_REF> TYPE R2RLEDLV_HD_REF.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_R2RLEDLV_HD_REF.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM R2RLEDLV_HD_REF
  INTO TABLE IT_R2RLEDLV_HD_REF.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM R2RLEDLV_HD_REF
*  INTO TABLE @DATA(IT_R2RLEDLV_HD_REF2).
*--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_R2RLEDLV_HD_REF INDEX 1 INTO DATA(WA_R2RLEDLV_HD_REF2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_R2RLEDLV_HD_REF ASSIGNING <R2RLEDLV_HD_REF>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<R2RLEDLV_HD_REF>-DELIV_NUMB = 1.
<R2RLEDLV_HD_REF>-PURCH_NO = 1.
<R2RLEDLV_HD_REF>-PURCH_DATE = 1.
<R2RLEDLV_HD_REF>-PO_SUPPLEM = 1.
<R2RLEDLV_HD_REF>-CUST_REFERENCE = 1.

ENDLOOP.

LOOP AT IT_R2RLEDLV_HD_REF INTO WA_R2RLEDLV_HD_REF.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_R2RLEDLV_HD_REF-REF_DOC, sy-vline,
  WA_R2RLEDLV_HD_REF-REF_DOC_TYPE, sy-vline,
  WA_R2RLEDLV_HD_REF-PURCH_NO_C, sy-vline,
  WA_R2RLEDLV_HD_REF-PO_METHOD, sy-vline,
  WA_R2RLEDLV_HD_REF-PURCH_NO_S, sy-vline,
  WA_R2RLEDLV_HD_REF-PO_DAT_S, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_R2RLEDLV_HD_REF 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_R2RLEDLV_HD_REF 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_R2RLEDLV_HD_REF INTO WA_R2RLEDLV_HD_REF.


*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 DELIV_NUMB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_R2RLEDLV_HD_REF-DELIV_NUMB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_R2RLEDLV_HD_REF-DELIV_NUMB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field REF_DOC
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_R2RLEDLV_HD_REF-REF_DOC
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_R2RLEDLV_HD_REF-REF_DOC.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORDER_NUMB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_R2RLEDLV_HD_REF-ORDER_NUMB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_R2RLEDLV_HD_REF-ORDER_NUMB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSN, internal->external for field R2R_PROJ_NUM
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_R2RLEDLV_HD_REF-R2R_PROJ_NUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_R2RLEDLV_HD_REF-R2R_PROJ_NUM.
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_R2RLEDLV_HD_REF_STR, 
DELIV_NUMB TYPE STRING,
PURCH_NO TYPE STRING,
PURCH_DATE TYPE STRING,
PO_SUPPLEM TYPE STRING,
CUST_REFERENCE TYPE STRING,
REF_DOC TYPE STRING,
REF_DOC_TYPE TYPE STRING,
PURCH_NO_C TYPE STRING,
PO_METHOD TYPE STRING,
PURCH_NO_S TYPE STRING,
PO_DAT_S TYPE STRING,
PO_METH_S TYPE STRING,
REF_1_S TYPE STRING,
ORDER_NUMB TYPE STRING,
ORDER_DATE TYPE STRING,
R2R_PO_TYPE TYPE STRING,
R2R_PROJ_NUM TYPE STRING,
R2R_PROJ_DESC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_R2RLEDLV_HD_REF_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_R2RLEDLV_HD_REF_STR-DELIV_NUMB sy-vline 
WA_R2RLEDLV_HD_REF_STR-PURCH_NO sy-vline 
WA_R2RLEDLV_HD_REF_STR-PURCH_DATE sy-vline 
WA_R2RLEDLV_HD_REF_STR-PO_SUPPLEM sy-vline 
WA_R2RLEDLV_HD_REF_STR-CUST_REFERENCE sy-vline 
WA_R2RLEDLV_HD_REF_STR-REF_DOC sy-vline 
WA_R2RLEDLV_HD_REF_STR-REF_DOC_TYPE sy-vline 
WA_R2RLEDLV_HD_REF_STR-PURCH_NO_C sy-vline 
WA_R2RLEDLV_HD_REF_STR-PO_METHOD sy-vline 
WA_R2RLEDLV_HD_REF_STR-PURCH_NO_S sy-vline 
WA_R2RLEDLV_HD_REF_STR-PO_DAT_S sy-vline 
WA_R2RLEDLV_HD_REF_STR-PO_METH_S sy-vline 
WA_R2RLEDLV_HD_REF_STR-REF_1_S sy-vline 
WA_R2RLEDLV_HD_REF_STR-ORDER_NUMB sy-vline 
WA_R2RLEDLV_HD_REF_STR-ORDER_DATE sy-vline 
WA_R2RLEDLV_HD_REF_STR-R2R_PO_TYPE sy-vline 
WA_R2RLEDLV_HD_REF_STR-R2R_PROJ_NUM sy-vline 
WA_R2RLEDLV_HD_REF_STR-R2R_PROJ_DESC sy-vline      INTO ld_text SEPARATED BY SPACE.

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