Spring Boot + Mybatis 全注解与XML

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全注解方式

Mybatis maper的全注解形式，不用dao接口，不用mapper的xml文件，都在一个类里面

/**
 * mybatis的dao接口和mapper配置文件的合体
 */
@Mapper
@Repository
public interface CustomerMapper {
    @Select("SELECT * FROM customers")
    List findAll();
}

application.properties

server.port=8080
server.servlet.context-path=/boot

spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp

# mysql
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/shpun?useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root

测试通过

@RunWith(SpringRunner.class)
@SpringBootTest
public class TestspringbootApplicationTests {

    @Autowired
    private CustomerMapper customerMapper;

    @Test
    public void testCustomerMapper(){
        System.out.println(customerMapper.findAll());
    }

}

xml方式

mybatis-config.xml mybatis的配置文件

CustomerMapper.xml mapper的xml文件

    
        select * from customers
    

application.properties

server.port=8888
server.servlet.context-path=/yml

spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp

# mysql
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/shpun?useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root

# mybatis
mybatis.type-aliases-package=com.shpun.bean
mybatis.config-location=classpath:mybatis/mybatis-config.xml
mybatis.mapper-locations=classpath:mapper/*.xml

dao 接口

@Mapper
@Repository
public interface CustomerDao{
    List selectAllCustomers();
}

测试通过

@RunWith(SpringRunner.class)
@SpringBootTest
public class TestspringbootApplicationTests {

    @Autowired
    private CustomerDao customerDao;

    @Test
    public void testCustomerDao(){

        System.out.println(customerDao.selectAllCustomers());

    }
}

ps：

先前用xml的时候，提示错误找不到dao的bean，在dao上添加

@Mapper

如果是多个dao接口的话，每个都加比较麻烦，可以在SpringBootApplication的java类中添加

@MapperScan("com.shpun.dao")

参考 如何优雅的使用mybatis