SpringBoot(三) 集成MyBatis

SpringBoot集成MyBatis的相关步骤如下：

1. 引入依赖

<!--整合mybatis  注意不要使用1.0.0版本，因为不支持springboot的热部署也不支持springboot部署成jar包-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.3</version>
</dependency>

<dependency>
    <groupId>commons-dbcp</groupId>
    <artifactId>commons-dbcp</artifactId>
    <version>1.4</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.38</version>
</dependency>

说明:由于springboot整合mybatis版本中默认依赖mybatis 因此不需要额外引入mybati版本,否则会出现冲突

2. 配置配置文件（application.yml中）

spring:
  mvc:
    view:
      prefix: /
      suffix: .jsp
  datasource:
    type: org.apache.commons.dbcp.BasicDataSource   #指定连接池类型
    driver-class-name: com.mysql.jdbc.Driver        #指定驱动
    url: jdbc:mysql://localhost:3306/cmfz           #指定url
    username: root									#指定用户名
    password: root								 	#指定密码

3 .加入mybatis配置（application.yml中）

#配置文件中加入如下配置:

mybatis:
  mapper-locations: classpath:com/baidu/mapper/*.xml  #指定mapper配置文件位置
  type-aliases-package: com.baidu.entity              #指定起别名来的类

//入口类中加入如下配置:
@SpringBootApplication
@MapperScan("com.baidu.dao")   //必须在入口类中加入这个配置
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}

4. 建表

CREATE TABLE `t_clazz` (
  `id` varchar(40) NOT NULL,
  `name` varchar(80) DEFAULT NULL,
  `no` varchar(90) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

5.开发实体类

public class Clazz {
    private String id;
    private String name;
    private String no;
    //get set 方法省略....
}

6. 开发DAO接口以及Mapper

public interface ClazzDAO {
    List<Clazz> findAll();
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.baizhi.dao.ClazzDAO">
    <select id="findAll" resultType="Clazz">
        select * from t_clazz 
    </select>
</mapper>

7. 开发Service以及实现

//接口
public interface ClazzService {
    List<Clazz> findAll();
}
//实现
@Service
@Transactional
public class ClazzServiceImpl implements  ClazzService {
    @Autowired
    private ClazzDAO clazzDAO;
    
    @Transactional(propagation = Propagation.SUPPORTS)
    @Override
    public List<Clazz> findAll() {
        return clazzDAO.findAll();
    }
}

8. 引入测试依赖

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

9. 编写测试类

@RunWith(SpringRunner.class)
@SpringBootTest(classes = Application.class)
public class TestClazzService {

    @Autowired
    private ClazzService clazzService;

    @Test
    public void test(){
        List<Clazz> all = clazzService.findAll();
        for (Clazz clazz : all) {
            System.out.println(clazz);
        }
    }
}