详解springboot集成mybatis xml方式

接下来我将详细讲解关于“详解Spring Boot集成MyBatis XML方式”的攻略。

1. 添加相关依赖

在pom.xml中添加以下依赖：

<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
   <groupId>org.mybatis.spring.boot</groupId>
   <artifactId>mybatis-spring-boot-starter</artifactId>
   <version>2.0.0</version>
</dependency>

2. 添加相关配置

在application.properties中添加以下配置信息：

#MyBatis
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.type-aliases-package=com.example.demo.entity
# DataSource
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

3. 编写Mapper接口

可以在 src/main/java/com/example/demo/mapper 下添加 UserMapper.java 接口

@Mapper
public interface UserMapper {
    User getUserById(int id);
    void addUser(User user);
    void updateUser(User user);
    void deleteUser(int id);
    List<User> getAllUser();
}

4. 编写Mapper.xml文件

可以在 src/main/resources/mapper/UserMapper.xml 文件下添加以下示例代码

<mapper namespace="com.example.demo.mapper.UserMapper">
    <resultMap id="BaseResultMap" type="com.example.demo.entity.User">
        <id column="id" property="id" jdbcType="INTEGER"/>
        <result column="username" property="username" jdbcType="VARCHAR"/>
        <result column="password" property="password" jdbcType="VARCHAR"/>
    </resultMap>
    <select id="getUserById" resultMap="BaseResultMap">
        select id, username, password from user where id=#{id}
    </select>
    <select id="getAllUser" resultMap="BaseResultMap">
        select id, username, password from user
    </select>
    <insert id="addUser">
        insert into user(username, password) values(#{username}, #{password})
    </insert>
    <update id="updateUser">
        update user set username=#{username}, password=#{password} where id=#{id}
    </update>
    <delete id="deleteUser">
        delete from user where id=#{id}
    </delete>
</mapper>

5. 编写Service层和Controller层

现在可以在 src/main/java/com/example/demo/service 下添加 UserService.java接口文件和 UserServiceImpl.java 实现类文件，代码如下：

public interface UserService {
    List<User> getAllUser();
    User getUserById(int id);
    void addUser(User user);
    void updateUser(User user);
    void deleteUser(int id);
}

@Service
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

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

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

    @Override
    public void addUser(User user) {
        userMapper.addUser(user);
    }

    @Override
    public void updateUser(User user) {
        userMapper.updateUser(user);
    }

    @Override
    public void deleteUser(int id) {
        userMapper.deleteUser(id);
    }
}

在 src/main/java/com/example/demo/controller 下添加 UserController.java 文件，代码如下：

@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/all")
    public List<User> getAllUser() {
        return userService.getAllUser();
    }

    @GetMapping("/{id}")
    public User getUserById(@PathVariable int id) {
        return userService.getUserById(id);
    }

    @PostMapping("/")
    public void addUser(@RequestBody User user) {
        userService.addUser(user);
    }

    @PutMapping("/")
    public void updateUser(@RequestBody User user) {
        userService.updateUser(user);
    }

    @DeleteMapping("/{id}")
    public void deleteUser(@PathVariable int id) {
        userService.deleteUser(id);
    }

}

6. 启动Spring Boot

最后，启动Spring Boot应用程序，程序会自动扫描 UserMapper.xml 文件并将所有的Mapper映射至Mybatis框架中，从而实现对数据库的操作。

以上就是关于“详解Spring Boot集成MyBatis XML方式”的攻略了。

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