JCBC连接

//1、注册驱动

DriverManager.registerDriver(new com.mysql.jdbc.Driver());

//2、获取连接

Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/localdatabase", "root", "12345678");

//3、获取操作数据库的预处理对象

PreparedStatement pstm = conn.prepareStatement("select * from user");

//4、执行sql语句并获取返回结果

ResultSet rs= pstm.executeQuery();

//5、封装结果集

while(rs.next()){

System.out.println(rs.getString("name"));

}

//6、释放资源

rs.close();

pstm.close();

conn.close();