spring boot 访问 mysql
方式三：spring boot + mybaits
pom 文件引入 依赖
<!-- mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.1</version>
</dependency>
<!-- mysql驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>配置mybaits
mybatis
# 对应实体类的包名
mybatis.typeAliasesPackage=com.example.demo.model
# mapper.xml文件所在位置
mybatis.mapperLocations=classpath:**/mapper/*.xml加入 entity mapper service controller 文件
entity
public class User {
@Id
@GeneratedValue(strategy= GenerationType.IDENTITY)
private Long id;
private String name;
private int age;
private String sex;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
}mapper
@Mapper
public interface UserMapper {
User findUserById(Long id);
int add(User user);
int update(User user);
}xml
<?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.example.demo.dao.mybatis.UserMapper">
<resultMap id = "BaseResult" type = "com.example.demo.model.User">
<result property = "id" column = "id"/>
<result property = "name" column = "name"/>
</resultMap>
<select id = "findUserById" resultMap = "BaseResult">
SELECT * FROM user where id = #{id}
</select>
<insert id="add" useGeneratedKeys="true" keyProperty="id" keyColumn="id">
insert into user (name,age,sex) values (#{name},#{age},#{sex})
</insert>
<update id = "update" parameterType="com.example.demo.model.User">
update user set name = #{name} ,age = #{age} ,sex = #{sex} where id = ${id}
</update>
</mapper>service
@Service
public class MybatisUserService {
@Autowired
UserMapper userDao;
public int add(User user){
return userDao.add(user);
}
public int update(User user){
return userDao.update(user);
}
public User getById(long id){
return userDao.findUserById(id);
}
}controller
@RestController
@RequestMapping("/mybatisUser")
public class MybatisUserController {
@Autowired
MybatisUserService userService;
@RequestMapping(value = "/add",method = RequestMethod.POST)
public Object addUser(@RequestBody User user){
return userService.add(user);
}
@RequestMapping(value = "/update",method = RequestMethod.PUT)
public Object updateUser(@RequestBody User user){
return userService.update(user);
}
@RequestMapping(value = "/find",method = RequestMethod.GET)
public Object updateUser(long id){
return userService.getById(id);
}
}主类上加扫描 mapper 路径
@SpringBootApplication
@MapperScan("com.example.demo.dao.mybatis")
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}启动项目 测试