连接oracle数据库

注意：在项目下的 WebContent ==》WEB-INF ==》lib 下导入ojdbc14.jar包

        1.1、注册驱动类
                 Class.forName("oracle.jdbc.driver.OracleDriver");
        1.2、连接数据库
                Connection con =null;

con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:ORCl", "scott", "tiger");

        1.3、定义PreparedStatement对象，用来执行sql语句

                PreparedStatement ps = con.prepareStatement(" SQL语句");

        1.4、给占位符赋值

                ps.set数据类型(占位符位置，"字段名");

        1.5、执行sql语句

                int i = ps.executeUpdate();

                或者

                ResultSet rs = ps.executeQuery();

        1.6、处理结果

        1.7、关闭连接

                对象名.close();