ORA-06502: PL/SQL: numeric or value error: hex to raw conversion error

I am getting the above  error here. How do I convert a rowtype to a varchar            

DBMS_LOB.writeappend(r_data, length(sll_rec.OracleRow), UTL_RAW.CAST_TO_VARCHAR2         (sll_rec.OracleRow));  ------------------------------------------------------------------------------------------------------------------       


                 

function    createOracleFile ()
RETURN CLOB IS



       cursor sll_cur is

        SELECT *from employees




sll_rec sll_cur%ROWTYPE ;

r_data CLOB;




begin


     open sll_cur;

       LOOP
         fetch sll_cur into sll_rec;
         exit when sll_cur%NOTFOUND;

                 -- I am getting an error here
       DBMS_LOB.writeappend(r_data, length(sll_rec.OracleRow), UTL_RAW.CAST_TO_VARCHAR2         (sll_rec.OracleRow));         
                                                   

       END LOOP;

       return r_data;

tech_questionAsked:
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tech_questionAuthor Commented:
I found what the error is, I had to add this statement but still I do not get the entire data that is being returned by the query ,  dbms_lob.createtemporary(lob_loc => r_data, cache=> TRUE, dur=> DBMS_LOB.call) !

How can I get the entire data returned by the query !
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Mark GeerlingsDatabase AdministratorCommented:
"How do I convert a rowtype to a varchar?"  I'm not sure that is supported in Oracle, are you?

If what you want is a varchar (or varchar2) variable (or variables) that contain the contents of a particular database row, one option would be to declare varchar2 variables corresponding to each column in the table, then change your cursor from "select * from..." to: "select [column1], [column2], etc. from...", and change your "fetch" to:
  fetch sll_cur into [variable1], [variable2], etc.
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actonwangCommented:
ROW type only can convert with varchar(char) or nvarchar(nchar). Other types as date, number etc will fail to cast into row directly.

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actonwangCommented:
sorry, the above was wrong as I looked at the wrong place.

>> UTL_RAW.CAST_TO_VARCHAR2(sll_rec.OracleRow)

     function UTL_RAW.CAST_TO_VARCHAR2()  normally accept RAW datatype. If you pass in other datatype, it will do implicit conversion using hextoraw function.
     The error is triggered by hextoraw function.

      Try this:
      select utl_raw.cast_to_varchar2('31') from dual
      /

      you will get '1'

     but this:
     select utl_raw.cast_to_varchar2(' 1') from dual
      /
 
     you will get error which is about the same you got.
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actonwangCommented:
%ROWTYPE hardly convert with raw or varchar , you might add each column value in as markgeer suggested.
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actonwangCommented:
I think it is related to your other question. I believe that you already got it and wrote your column value directly.
:)
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