Insert concatenated data from Varchar2 to Clob

Question

Hi,
I have a table with the following structure:
create table logmst (logno varchar2(10), log_detail1 varchar2(4000), log_detail2(4000));
I would like to concatenate the data from log_detail1 and log_Detail2 into a Clob datatype. So, i have created another table:
create table test(id varchar2(10), filedesc clob default empty_clob());
I tried:
insert into test (id, filedesc) select logno, to_clob(log_Detail1 || log_Detail2) from logmst;
System shows ORA-01489: result of string concatenation is too long.
Can somebody help? Thanks in advance.

Answer 1

You have to write a small procedure. You cannot achieve this using a SQL statment.
Declare
   myClob CLOB;
   logNo logMst.logNo%type;
   col1 logmst.log_detail1%type;
   col2 logmst.log_detail2%type;
   length_col1 number;
begin
    For rec in (select logNo, log_Detail1, log_Detail2 from logMst)
    loop
              logNo := rec.LogNo;
              col1 := rec.Log_Detail1;
              col2 := rec.Log_Detail2;
                 myClob := empty_clob();
                dbms_lob.createtemporary(myClob, TRUE);
                length_col1 := length(col1);
                dbms_lob.write(myClob , length_col1,1,col1);
                dbms_lob.write(myClob , length(col2), length_col1+1,col1);
               -- Write here SQL statemnt to write this CLOB to your table...
    end loop;
end;Thanks,
Dharmesh Patel