How to select a column in with a CLOB datatype

Question

I have a table on my jsp page that will have a column populated by a database column with type CLOB. I am running into some trouble doing this, and have seen other questions asked about this, but the answers have not worked for me. Here is my statement where comments is a CLOB.

   stmt = conn.prepareStatement("SELECT DISTINCT restriction, person, start_date, end_date, comments "
                           + "  FROM restrictions WHERE person = ? "
                           + "   AND (start_date BETWEEN TO_DATE (? , 'yyyy/mm/dd') AND TO_DATE (? , 'yyyy/mm/dd') "
                           + "    OR start_date < TO_DATE (? , 'yyyy/mm/dd') AND end_date IS NULL) " );

        stmt.setString(1, Id);
        stmt.setString(2, StartRest);
        stmt.setString(3, EndRest);
        stmt.setString(4, EndRest);
        result = stmt.executeQuery();     

And then I will have the columns in a while loop:

   while (result.next()) {     
        restrictions = StringUtils.defaultString(result.getString("str_restriction"));
        .......
        // here is where I would get my Clob data from the query.

So, basically, I was wondering if there is a way to translate the CLOB in the query, or even in the java code, so it would be usable in my page.

Answer 1

The problem comes from the distint clause of the query, which can't be applied to a CLOB.

Check if the distinct keyword is really needed. Or maybe you could rewrite your query as

select restriction, person, start_date, end_date, comments from restrictions 
where id in (select distinct id from restrictions where <original where clause>)

PS: next time, include the error message and your database in the question. I've been able to find the problem with a simple google search on "ora-00932 clob".