i want to call an oracle function which takes 5 or 6 input and has a single output. Using the following code,

CallableStatementCallback cb = new CallableStatementCallback() {
public Object doInCallableStatement(CallableStatement cs)
throws SQLException {
cs.execute();
return null;
}
};

jdbcTemplate.execute( "{ ? = content_item.new ( ?, ?, ?) }", cb );

Now my question , How do i define what these input vars are ?
and how do i get the returned value from this function .

Thank you