i'm a newer to the jsp,please help me.

i want to input a String like that "2006-6-30" in the form,then the jsp
request the input,and save it to Oracle Database.

But i don't know how to save a String to a Date type field in database.

i write some code here,i know it's wrong,but i don't know how to
correct.

<%
adddate=request.getParameter("adddate");

stmt.executeUpdate("INSERT INTO news(newsid,adddate)
VALUES(newsid.nextval,'"+adddate+"')");

%>