JDBC statment连接数据库

public class jdbcFirstDemo {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
    //1.用户身份和url
    String url="jdbc:mysql://localhost:3306/jdbcstudy?serverTimezone=GMT%2B8";
    String username = "root";
    String password = "123456789";

　　//2.加载驱动
    Class.forName("com.mysql.cj.jdbc.Driver");//固定写法

    //3.连接成功，数据库对象  Connection 代表数据库
    Connection connection = DriverManager.getConnection(url,username,password);

    //4.执行SQL的对象 Statment 执行Sql的对象
        Statement statement = connection.createStatement();
    //5.执行SQL的对象 去 执行SQL，可能存在结果 查看返回结果
        String sql = "SELECT * FROM users";

        ResultSet resultSet = statement.executeQuery(sql);//返回结果集  封装了查询的结果

        while ((resultSet.next())){
            System.out.println("id=" + resultSet.getInt("id"));
            System.out.println("name=" + resultSet.getString("name"));
            System.out.println("pwd=" + resultSet.getString("password"));
            System.out.println("email=" + resultSet.getString("email"));
            System.out.println("birth=" + resultSet.getDate("birthday"));
            System.out.println("-----------------------------");
        }
    //6.释放连接
        resultSet.close();
        statement.close();
        connection.close();
    }
}
//工具类