日常代码

public static void main(String[] args) {

Connection connection =null  ;

    Statement statement =null ;

    ResultSet resultSet =null ;

    try {

// 1 注册驱动

        //DriverManager.registerDriver(new Driver());

        Class.forName("com.mysql.jdbc.Driver");

        // 2 获取链接

        connection = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root", "123456");

        // 3 准备状态

        statement = connection.createStatement();

        // 4 准备sql执行

        resultSet = statement.executeQuery("select * from book");

        // 5 获取结果并遍历结果集

        while (resultSet.next() ) {

System.out.println(resultSet.getInt(1) + resultSet.getString(2)

+ resultSet.getString(3) + resultSet.getDouble(4)

);

        }

}catch ( Exception e ) {

System.out.println("可能获取驱动有问题");

    }finally {

// 6 关闭资源

        try {

resultSet.close();

            //System.out.println("申请资源不成功，无法关闭");

            System.out.println("网络开小差了哦，亲");

        }catch (SQLException e) {

e.printStackTrace();

        }

try {

statement.close();

        }catch (SQLException e) {

e.printStackTrace();

        }

try {

connection.close();

        }catch (SQLException e) {

e.printStackTrace();

        }

}

}