【Spring Boot 十一】 MyBatis 连接数据库
最近比较忙，没来得及抽时间把MyBatis的集成发出来，其实mybatis官网在2015年11月底就已经发布了对SpringBoot集成的Release版本，Github上有代码：https://github.com/mybatis/mybatis-spring-boot
前面对JPA和JDBC连接数据库做了说明，本文也是参考官方的代码做个总结。
关于在Spring Boot中集成MyBatis，可以选用基于注解的方式，也可以选择xml文件配置的方式。通过对两者进行实际的使用，个人建议使用XML的方式（官方也建议使用XML）
通过xml配置文件方式
1、添加pom依赖
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<dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.2.0</version> </dependency> |
2、创建UserDao和UserDao.xml
UserDao.java
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package com.spring.boot.dao; import com.spring.boot.entity.User; import org.apache.ibatis.annotations.Param; /** * UserDao * Created by XJH on 2017/8/29. */ public interface UserDao { User getUserById(@Param("id") Integer id); } |
3、创建UserService和userServiceImpl
UserService.java
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package com.spring.boot.service; import com.spring.boot.entity.User; /** * UserService * Created by XJH on 2017/8/31. */ public interface UserService { User getUserById(Integer id); } |
UserServiceImpl.java
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package com.spring.boot.service.impl; import com.spring.boot.dao.UserDao; import com.spring.boot.entity.User; import com.spring.boot.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; /** * UserServiceImpl * Created by XJH on 2017/8/31. */ @Service public class UserServiceImpl implements UserService { private final UserDao userDao; @Autowired public UserServiceImpl(UserDao userDao) { this.userDao = userDao; } @Override public User getUserById(Integer id) { return userDao.getUserById(id); } } |
4、创建UserController
UserController.java
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package com.spring.boot.web; import com.spring.boot.entity.User; import com.spring.boot.service.UserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; /** * UserController * Created by XJH on 2017/8/31. */ @RestController @RequestMapping("/user") public class UserController { private final UserService userService; @Autowired public UserController(UserService userService) { this.userService = userService; } @GetMapping(produces = {"application/json;charset=UTF-8"}) public User getUserById(Integer id){ return userService.getUserById(id); } } |
5、创建UserDao.xml
/main/resources/mapper/UserDao.xml
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<?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.spring.boot.dao.UserDao"> <select id="getUserById" resultType="com.spring.boot.entity.User"> select * from user where id = #{id}; </select> </mapper> |
6、创建一个XML（不然类似于数据库字段create_time无法映射到实体类createTime）
/main/resources/mybatis-config.xml
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<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <settings> <setting name="defaultStatementTimeout" value="3000"/> <setting name="useColumnLabel" value="true"/> <setting name="mapUnderscoreToCamelCase" value="true"/> <setting name="useGeneratedKeys" value="true"/> </settings> <!-- Continue going here --> </configuration> |
7、在application.properties添加如下信息
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#MyBatis mybatis.mapper-locations=classpath:mapper/*.xml mybatis.type-aliases-package=com.spring.boot.entity mybatis.config-location=classpath:mybatis-config.xml |
8、在启动项目SpringBootSimpleApplication中添加如下注解：
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package com.spring.boot; import org.mybatis.spring.annotation.MapperScan; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.web.servlet.ServletComponentScan; /** * SpringBootSampleApplication * Created by XJH on 2017/8/22. */ @SpringBootApplication @ServletComponentScan @MapperScan("com.spring.boot.dao") //配置扫描mapper接口的地址 public class SpringBootSampleApplication { private static Logger logger= LoggerFactory.getLogger(SpringBootSampleApplication.class); public static void main(String[] args) { SpringApplication.run(SpringBootSampleApplication.class, args); logger.info("SpringBoot Start Success"); } } |
到这里我们的 spring boot 整合 mybatis 算是完成了。
测试
启动项目
访问：http://localhost:8080/spring_boot/user?id=1 （在controller可以看到访问路径）
结果：
{"id":1,"name":"xjh","age":99,"profile":"xjh个人简介","password":"xjh的密码","salt":"xjh的salt","createTime":1504694109000,"updateTime":1504694167000}
（在前面说过了，如果不加入mybatis-config.xml的话这个createTime和updateTime就是null）
使用注解方式
可以看一下mybatis官方的demo：https://github.com/mybatis/mybatis-spring-boot
配置上很简单，使用上要对注解多做了解。至于xml和注解这两种哪种方法好，众口难调还是要看每个人吧。我个人比较喜欢xml方式。
UserDao.java
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package com.spring.boot.dao; import com.spring.boot.entity.User; import org.apache.ibatis.annotations.Param; import org.apache.ibatis.annotations.Select; /** * UserDao * Created by XJH on 2017/8/29. */ public interface UserDao { @Select("SELECT * FROM User WHERE id = #{id}") User getUserById(@Param("id") Integer id); } |
关于MaBatis基于注解的方式，有一篇博文讲的很清楚，可以看看http://blog.csdn.net/luanlouis/article/details/35780175
下一篇 spring boot 整合shiro。
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