创建spring-boot项目参考上一章内容《SpringBoot2.x初体验》

加入相关依赖

       

<!-- 创建的是web项目，所有把web需要的依赖加入进来 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- mysql -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>
<!-- mybatis相关依赖 -->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot</artifactId>
</dependency>
<!-- 数据库连接池 -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
</dependency>
<!-- lombok 与mybatis无关，此处加入lombok只是为了编写po时不写set get方法-->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
</dependency>

加入依赖后，开始coding，这里对mybatis不多做介绍主要介绍springboot与mybatis的整合。项目目录如图

一、编写UserController.java代码

@RestController
public class UserController {

    @Autowired
    UserService userService;

    @GetMapping("/user/get/{id}")
    public String getUser(@PathVariable("id") Integer id) {
        System.out.println(id);
        User user = userService.getUserById(id);
        return user.toString();
    }

    @GetMapping("/user/all")
    public String getAll() {
        List<User> allUser = userService.getAllUser();
        return allUser.toString();
    }

    @PostMapping("/user/save")
    public String saveUser(@RequestBody User user) {
        userService.saveUser(user);
        return "ok";
    }

    @PutMapping("/user/update")
    public String updateUser(@RequestBody User user) {
        userService.updateUser(user);
        return "ok";
    }

    @DeleteMapping("user/del/{id}")
    public String delUser(@PathVariable("id") Integer id) {
        userService.delUser(id);
        return "ok";
    }
}

二、UserService.java代码

public interface UserService {

    public User getUserById(Integer id);

    public List<User> getAllUser();

    public void saveUser(User user);

    public int updateUser(User user);

    public int delUser(Integer id);

}

三、UserServiceImpl.java代码

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    UserMapper userMapper;

    @Override
    public User getUserById(Integer id) {
        return userMapper.getById(id);
    }

    @Override
    public List<User> getAllUser() {
        return userMapper.getAll();
    }

    @Transactional
    @Override
    public void saveUser(User user) {
        userMapper.save(user);
    }

    @Transactional
    @Override
    public int updateUser(User user) {
        return userMapper.update(user);
    }

    @Transactional
    @Override
    public int delUser(Integer id) {
        return userMapper.delete(id);
    }

四、UserMapper.java

 

@Mapper
public interface UserMapper {

    User getById(Integer id);

    List<User> getAll();

    void save(User user);

    int update(User user);

    int delete(Integer id);


}

五、UserMapper.xml代码

<?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="online.daguo.mapper.UserMapper">

    <select id="getAll" resultType="online.daguo.po.User">
        select id,name,age from user
    </select>

    <select id="getById" resultType="online.daguo.po.User" parameterType="int">
        select id,name,age from user where id=#{id}
    </select>

    <insert id="save" parameterType="user" >
        insert into user (name,age) values (#{name},#{age})
    </insert>

    <update id="update" parameterType="user">
        update user
        <set>
            <if test="name != null and name != '' ">name = #{name},</if>
            <if test="age != ''">age = #{age},</if>
        </set>
        where id = #{id}
    </update>

    <delete id="delete" parameterType="int">
        delete from user where id = #{id}
    </delete>
</mapper>

六、application.propoproperties

// 配置服务器的端口和访问路径
server.port=8080
server.servlet.context-path= /
// 配置数据源
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
// mysql驱动
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
// 数据库连接地址
spring.datasource.url=jdbc:mysql://localhost:3306/springboot_mybatis?useUnicode=true&characterEncoding=utf8&useSSL=false
// 数据库连接账号
spring.datasource.username=root
// 数据库连接密码
spring.datasource.password=root
// Mybatis 配置
mybatis.configuration.map-underscore-to-camel-case=true
// *Mapper.xml所在的位置  本示例中mybatis mapper文件存放在resources目录下
mybatis.mapper-locations=mybatis/*Mapper.xml
// 实体映射别名
mybatis.type-aliases-package=online.daguo.po

至此，spring-boot 与mybatis整合完毕。

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