SpringBoot-19-Mybatis的xml配置方式
在上一章节中，我们已经简单介绍mybatis的增删改查的基本操作，基础(单表)的增删改查可以按照，如果稍微复杂一些我们就需要使用mybatis的xml格式去实现。
那么我们开始使用mybatis的xml方式去实现增删改查。
代码实现
依赖的添加
创建项目以后在其pom.xml中添加对应mysql驱动和mybatis的依赖
<!--mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!--mybatis依赖-->
<!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.2.2</version>
</dependency>
在application.yml添加配置
server:
port: 8899
spring:
datasource:
url: jdbc:mysql://localhost:3306/mybatis?useUnicode=true&serverTimezone=Asia/Shanghai&characterEncoding=utf-8&useSSL=false
username: root
password: root
driver-class-name: com.mysql.cj.jdbc.Driver
mybatis:
mapper-locations: classpath:mapper/*.xml
注：
- mybatis通过配置
mybatis.mapper-locations来设置*.xml的路径
Student实体类的创建
student表，具体sql可以查看Spring-Data-JPA多数据源配置
@Data
public class Student implements Serializable {
/**
* ID
*/
private Long id;
/**
* 学生姓名
*/
private String name;
/**
* 性别默认男
*/
private String sex;
/**
* 年龄
*/
private Integer age;
/**
* 注册手机号
*/
private String mobile;
/**
* 注册邮箱
*/
private String email;
private Date createDate;
private Date updateDate;
/**
*是否可用(1 可用，0 删除用户)
*/
private Integer isEnabled;
private static final long serialVersionUID = 1L;
}
mapper的接口实现
@Mapper
public interface StudentMapper {
Student findById(@Param("id") Long id);
void updateStudent(Student student);
int insert(@Param("name") String name,
@Param("sex") String sex,
@Param("age") Integer age,
@Param("email") String email,
@Param("mobile") String mobile
);
int insertByObject(Student student);
}
注:这里有一个小知识点上一章节没有讲解
StudentMapper的注入方式：
- @Mapper方式：通过在mapper接口添加@Mapper注解，让mybatis底层为我们创建这个接口的实现类对象，如上
- 使用@MapperScan(“com.learn.springboot.mapper”)的方式实现批量注入mapper
@MapperScan("com.learn.springboot.mapper")
@SpringBootApplication
public class SpringBootPart19Application {
public static void main(String[] args) {
SpringApplication.run(SpringBootPart19Application.class, args);
}
}
mapper对应的xml的配置实现
在创建mapper接口以后要在之前配置的路径下面添加其xml配置
<?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.learn.springboot.mapper.StudentMapper">
<select id="findById" resultType="com.learn.springboot.entity.Student">
SELECT * FROM STUDENT WHERE ID = #{id}
</select>
<insert id="insertByObject">
INSERT INTO STUDENT(NAME, SEX,AGE,EMAIL,MOBILE) VALUES(#{name}, #{sex}, #{age}, #{email}, #{mobile})
</insert>
<update id="updateStudent" parameterType="com.learn.springboot.entity.Student">
UPDATE STUDENT SET NAME=#{name},SEX=#{sex},AGE=#{age},EMAIL=#{email},MOBILE=#{mobile} WHERE id=#{id}
</update>
</mapper>
注：xml的路径为src\main\resources+mybatis.mapper-locations中配置的路径,例如本文中的xml路径为
src\main\resources\mapper
Service层的实现
在这一层我们分别实现StudentService接口和其接口的实现StudentServiceImpl
public interface StudentService {
Student updateStudent(Student student);
int insertByObject(Student student);
Student findById(Long id);
}
@AllArgsConstructor
@Service
public class StudentServiceImpl implements StudentService {
private StudentMapper studentMapper;
@Override
public int insertByObject(Student student){
return studentMapper.insertByObject(student);
}
@Override
public Student updateStudent(Student student){
studentMapper.updateStudent(student);
return student;
}
@Override
public Student findById(Long id) {
return studentMapper.findById(id);
}
}
控制层的实现
在这一层我们创建StudentController，并将StudentService注入
@Slf4j
@RequestMapping("/student")
@RestController
public class StudentController {
/**
* studentService注入StudentController
*/
@Autowired
private StudentService studentService;
@PostMapping("insert")
public int insertByObject(@RequestBody Student student){
return studentService.insertByObject(student);
}
@PostMapping("update")
public Student updateStudent(@RequestBody Student student) {
return studentService.updateStudent(student);
}
@GetMapping("/select/{id}")
public Student findByName(@PathVariable("id") Long id) {
return studentService.findById(id);
}
}
到此mybatis通过xml方式的实现以及介绍结束，快去实现一下吧，如果没有成功，可以私信我获取代码查看区别。
如果您觉得本文不错，欢迎点击下方关注支持，您的关注是我坚持的动力！
