Question

I’m not sure how to use Java/JDBC to insert a very long string into an Oracle database.

I have a String which is greater than 4000 characters, lets say it’s 6000. I want to take this string and store it in an Oracle database.

The way to do this seems to be with the CLOB datatype. Okay, so I declared the column as description CLOB.

Now, when it comes time to actually insert the data, I have a prepared statement pstmt. It looks like pstmt = conn.prepareStatement(“INSERT INTO Table VALUES(?)”).

So I want to use the method pstmt.setClob(). However, I don’t know how to create a Clob object with my String in it; there’s no constructor (presumably because it can be potentially much larger than available memory).

How do I put my String into a Clob?

Keep in mind I’m not a very experienced programmer; please try to keep the explanations as simple as possible. Efficiency, good practices, etc. are not a concern here, I just want the absolute easiest solution. I’d like to avoid downloading other packages if it all possible; right now I’m just using JDK 1.4 and what is labelled ojdbc14.jar. I’ve looked around a bit but I haven’t been able to follow any of the explanations I’ve found.

If you have a solution that doesn’t use Clobs, I’d be open to that as well, but it has to be one column.

Answer 1

You have (at least) two options:

• use connection.createClob() to create a Clob, set the data on it, and set it on the prepared statement. This will work for smaller data

• use preparedStatement.setClob(position, reader) – here you will have a Reader instance.