JDBC进阶

PreparedStatement的使用：

conn = DriverManager.getConnection("jdbc:mysql://localhost/mydata?"
                    + "user=root&password=root");
            pstmt = conn.prepareStatement("insert into dept values (?,?,?)");
            pstmt.setInt(1,deptno);
            pstmt.setString(2,dname);
            pstmt.setString(3,loc);
            pstmt.executeUpdate();