数据库的五种Driver连接方式_mysql driver

1.使用配置文件 application.yml或者properties + springboot

以下是yml的书写方式，通常文件要放在config包下

server:
  port: 8080
spring:
  application:
    #应用名称
    name: database
 
  datasource:
    druid:
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://localhost:3306/reggie?useSSL=false&characterEncoding=UTF-8
      username: root
      password: 123445

2.在mysql.properties配置文件下

创建好properties配置文件后在一个类中连接数据库

//获取配置文件中的信息
Properties properties = new Properties();
properties.load(new FileInputStream("src\\mysql.properties"));
String root = properties.getProperty("user");
String password = properties.getProperty("password");
String url = properties.getProperty("url");
String driver = properties.getProperty("driver");
 
//注册驱动
Class.forName(driver);
 
//建立连接
Connection connection = DriverManager.getConnection(url, root, password);

3.直接创建driver对象

//1、注册驱动
Driver driver = new Driver();//创建driver对象
 
//2、得到连接
String url = "jdbc:mysql://localhost:3306/database?useSSL=false&characterEncoding=UTF-8;
 
//将用户名和密码放入Properties对象
Properties properties = new Properties();
properties.setProperty("user","root");
properties.setProperty("password","123456");
 
//进行连接
Connection connect = driver.connect(url, properties);

4.使用DriverManager注册驱动

注意driver类在MySQL8.0是有cj的，而8.0之前的driver类是没有的

//1、注册驱动
//利用反射加载driver类
Class<?> aClass = Class.forName("com.mysql.cj.jdbc.Driver");
Driver driver = (Driver)aClass.newInstance();
 
//2、得到连接
String url = "jdbc:mysql://localhost:3306/database?useSSL=false&characterEncoding=UTF-8";
 
//将用户名和密码放入Properties对象
Properties properties = new Properties();
properties.setProperty("user","root");
properties.setProperty("password","123456");
 
//注册driver驱动
DriverManager.registerDriver(driver);
 
//进行连接
Connection connect = DriverManager.getConnection(url, properties);

5.利用反射和静态方法创建

//1、注册驱动
//利用反射加载driver类
//在加载过程中就完成了driver类的注册
Class.forName("com.mysql.cj.jdbc.Driver");
 
//2、得到连接
String url = "jdbc:mysql://localhost:3306/database?useSSL=false&characterEncoding=UTF-8";
 
//将用户名和密码放入Properties对象
Properties properties = new Properties();
properties.setProperty("user","root");
properties.setProperty("password","123456");
//不需要注册驱动就可以直接调用静态方法
 
Connection connect = DriverManager.getConnection(url, properties);//进行连接