ABAP Select data from SAP table RN2DOCDATA_IN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN2DOCDATA_IN 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 RN2DOCDATA_IN. 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 RN2DOCDATA_IN 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_RN2DOCDATA_IN TYPE STANDARD TABLE OF RN2DOCDATA_IN,
      WA_RN2DOCDATA_IN TYPE RN2DOCDATA_IN,
      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: <RN2DOCDATA_IN> TYPE RN2DOCDATA_IN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN2DOCDATA_IN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN2DOCDATA_IN
  INTO TABLE IT_RN2DOCDATA_IN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN2DOCDATA_IN
*  INTO TABLE @DATA(IT_RN2DOCDATA_IN2).
*--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_RN2DOCDATA_IN INDEX 1 INTO DATA(WA_RN2DOCDATA_IN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN2DOCDATA_IN ASSIGNING <RN2DOCDATA_IN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN2DOCDATA_IN>-DOKNR = 1.
<RN2DOCDATA_IN>-EINRI = 1.
<RN2DOCDATA_IN>-PATNR = 1.
<RN2DOCDATA_IN>-FALNR = 1.
<RN2DOCDATA_IN>-ORGDO = 1.

ENDLOOP.

LOOP AT IT_RN2DOCDATA_IN INTO WA_RN2DOCDATA_IN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN2DOCDATA_IN-MITARB, sy-vline,
  WA_RN2DOCDATA_IN-DTID, sy-vline,
  WA_RN2DOCDATA_IN-DTVERS, sy-vline,
  WA_RN2DOCDATA_IN-PCODE, sy-vline,
  WA_RN2DOCDATA_IN-DODAT, sy-vline,
  WA_RN2DOCDATA_IN-DOTIM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN2DOCDATA_IN 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_RN2DOCDATA_IN 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_RN2DOCDATA_IN INTO WA_RN2DOCDATA_IN.


*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_RN2DOCDATA_IN-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2DOCDATA_IN-DOKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2DOCDATA_IN-EINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2DOCDATA_IN-EINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PATNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2DOCDATA_IN-PATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2DOCDATA_IN-PATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field FALNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2DOCDATA_IN-FALNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2DOCDATA_IN-FALNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ORGDO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2DOCDATA_IN-ORGDO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2DOCDATA_IN-ORGDO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MITARB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2DOCDATA_IN-MITARB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2DOCDATA_IN-MITARB.
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_RN2DOCDATA_IN_STR, 
DOKNR TYPE STRING,
EINRI TYPE STRING,
PATNR TYPE STRING,
FALNR TYPE STRING,
ORGDO TYPE STRING,
MITARB TYPE STRING,
DTID TYPE STRING,
DTVERS TYPE STRING,
PCODE TYPE STRING,
DODAT TYPE STRING,
DOTIM TYPE STRING,
STATUSEXTERN TYPE STRING,
DOKST TYPE STRING,
BEGRU TYPE STRING,
DWNAM TYPE STRING,
FILEP TYPE STRING,
DAPPL TYPE STRING,
VPRIOR TYPE STRING,
RES1 TYPE STRING,
RES2 TYPE STRING,
RES3 TYPE STRING,
RES4 TYPE STRING,
DKTXT TYPE STRING,
PROTF TYPE STRING,
DOKAR TYPE STRING,
DOKTL TYPE STRING,
DOKVR TYPE STRING,
MICROF TYPE STRING,
ROLLNO TYPE STRING,
ALBUM TYPE STRING,
EXTNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN2DOCDATA_IN_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_RN2DOCDATA_IN_STR-DOKNR sy-vline 
WA_RN2DOCDATA_IN_STR-EINRI sy-vline 
WA_RN2DOCDATA_IN_STR-PATNR sy-vline 
WA_RN2DOCDATA_IN_STR-FALNR sy-vline 
WA_RN2DOCDATA_IN_STR-ORGDO sy-vline 
WA_RN2DOCDATA_IN_STR-MITARB sy-vline 
WA_RN2DOCDATA_IN_STR-DTID sy-vline 
WA_RN2DOCDATA_IN_STR-DTVERS sy-vline 
WA_RN2DOCDATA_IN_STR-PCODE sy-vline 
WA_RN2DOCDATA_IN_STR-DODAT sy-vline 
WA_RN2DOCDATA_IN_STR-DOTIM sy-vline 
WA_RN2DOCDATA_IN_STR-STATUSEXTERN sy-vline 
WA_RN2DOCDATA_IN_STR-DOKST sy-vline 
WA_RN2DOCDATA_IN_STR-BEGRU sy-vline 
WA_RN2DOCDATA_IN_STR-DWNAM sy-vline 
WA_RN2DOCDATA_IN_STR-FILEP sy-vline 
WA_RN2DOCDATA_IN_STR-DAPPL sy-vline 
WA_RN2DOCDATA_IN_STR-VPRIOR sy-vline 
WA_RN2DOCDATA_IN_STR-RES1 sy-vline 
WA_RN2DOCDATA_IN_STR-RES2 sy-vline 
WA_RN2DOCDATA_IN_STR-RES3 sy-vline 
WA_RN2DOCDATA_IN_STR-RES4 sy-vline 
WA_RN2DOCDATA_IN_STR-DKTXT sy-vline 
WA_RN2DOCDATA_IN_STR-PROTF sy-vline 
WA_RN2DOCDATA_IN_STR-DOKAR sy-vline 
WA_RN2DOCDATA_IN_STR-DOKTL sy-vline 
WA_RN2DOCDATA_IN_STR-DOKVR sy-vline 
WA_RN2DOCDATA_IN_STR-MICROF sy-vline 
WA_RN2DOCDATA_IN_STR-ROLLNO sy-vline 
WA_RN2DOCDATA_IN_STR-ALBUM sy-vline 
WA_RN2DOCDATA_IN_STR-EXTNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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