1. 整合JUnit

1. 导入测试对应的starter
   由于整合JUnit不需要导入其他特别的依赖，只需要导入两个springboot基础的依赖坐标

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

2. 测试类使用@SpringBootTest修饰
   
   需要说明的是，@SpringBootTest后面最好都加上classes= 启动类的字节码对象，避免运行出错。

3. 使用自动装配的形式添加要测试的对象
   
   

2. 整合Mybatis

1. 创建springboot项目，选择当前模块需要使用的技术集（MyBatis、MySQL）
   
   我们看一下通过勾选技术集群生成的坐标依赖

		<dependency>
			<groupId>org.mybatis.spring.boot</groupId>
			<artifactId>mybatis-spring-boot-starter</artifactId>
			<version>2.2.2</version>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

2.设置数据源参数
新建application.yml核心配置文件，添加数据源信息

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db1?serverTimezone=UTC
    username: root
    password: 123456

3. 定义数据层接口与映射配置，测试类中注入dao接口，测试功能

@Mapper
public interface UserDao {

    @Select("select * from tb_user where id = #{id}")
    public User selectById(int id);
}

@SpringBootTest(classes = Springboot04MybatisApplication.class)
class Springboot04MybatisApplicationTests {

	@Resource
	private UserDao userDao;

	@Test
	public void testGetById() {
		System.out.println(userDao.selectById(4));
	}
}

3. 整合Mybatis-plus

1.手动添加SpringBoot整合MyBatis-Plus的坐标，可以通过mvnrepository获取

maven坐标仓库
地址：

https://mvnrepository.com/

	<dependency>
		<groupId>com.baomidou</groupId>
		<artifactId>mybatis-plus-boot-starter</artifactId>
		<version>3.4.3</version>
	</dependency>

2. 定义数据层接口与映射配置，继承BaseMapper

@Mapper
public interface UserDao extends BaseMapper<User> {
}

添加测试

@SpringBootTest(classes = Springboot05MybatisPlusApplication.class)
class Springboot05MybatisPlusApplicationTests {

	@Autowired
	private UserDao userDao;

	@Test
	void contextLoads() {
		User user = userDao.selectById(3);
		System.out.println(user);
	}
}

4. 整合Druid

1.导入Druid对应的starter

	<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>druid-spring-boot-starter</artifactId>
		<version>1.2.6</version>
	</dependency>

2. 根据Druid提供的配置方式进行配置
   Druid主要是对数据源书写进行规定,可以有如下两种写法

主流

spring:
  datasource:
    druid:
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://localhost:3306/db1?serverTimezone=UTC
      username: root
      password: 123456

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db1?serverTimezone=UTC
    username: root
    password: 123456
    type: com.alibaba.druid.pool.DruidDataSource