springboot整合mybatis, 增删改查

Posted 五星村小黄

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这篇文章是介绍 Spring Boot整合mybatis的,一个简单的增删改查。

建表
DROP TABLE IF EXISTS tbl_user;

CREATE TABLE tbl_user (
  id int(11) NOT NULL AUTO_INCREMENT,
  user_name varchar(255) NOT NULL,
  password varchar(255) NOT NULL,
  age int(11) DEFAULT NULL,
  PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;

 

在pom文件里添加mybatis依赖:

<dependency>
  <groupId>org.mybatis.spring.boot</groupId>
  <artifactId>mybatis-spring-boot-starter</artifactId>
  <version>1.3.2</version>
</dependency>

 

在application.properties配置文件中配置数据源、Mybatis的实体和配置文件路径:

spring.datasource.url=jdbc:mysql://localhost:3306/springboot_demo
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

mybatis.typeAliasesPackage: cn.yideng.mybatis.entity
mybatis.mapperLocations: classpath:mapper/*.xml


建立包结构:entity dao service controller
创建一个实体类:

public class User {

  private Integer id;
  private String userName;
  private String password;
  private Integer age;

  public User() {}

  public User(Integer id, String userName, String password, Integer age) {
    this.id = id;
    this.userName = userName;
    this.password = password;
    this.age = age;
  }

  // 省略 getter/setter, toString()
}

DAO接口:

public interface UserDao {

  List<User> findAll(); //查询所有记录

  void addUser(User user); // 新增

  void updateUser(User user); // 修改

  int deleteUser(Integer id); //根据id删除

}

Service接口:

public interface UserService {

  List<User> findAll();

  void addUser(User user);

  void updateUser(User user);

  int deleteUser(Integer id);

}


Service接口的实现类:

 

@Service(value="userService")
public class UserServiceImpl implements UserService{

  @Autowired
  private UserDao userDao;

  @Override
  public List<User> findAll() {
    return userDao.findAll();
  }

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

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

  @Override
  public int deleteUser(Integer id) {
    return userDao.deleteUser(id);
  }

}
```
UserMapper.xml映射文件:路径是 esourcesmapperUserMapper.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="cn.yideng.mybatis.dao.UserDao">

<resultMap id="userResultMap" type="cn.yideng.mybatis.entity.User">
  <id column="id" property="id" jdbcType="INTEGER" />
  <result column="user_name" property="userName" jdbcType="VARCHAR" />
  <result column="password" property="password" jdbcType="VARCHAR" />
  <result column="age" property="age" jdbcType="INTEGER" />
</resultMap>

  <sql id="user_column_list">
  id, user_name, password, age
  </sql>

<select id="findAll" resultMap="userResultMap">
  select
  <include refid="user_column_list" />
  from tbl_user
</select>

<insert id="addUser" parameterType="cn.yideng.mybatis.entity.User">
  insert into tbl_user (user_name, password, age)
  values (
  #{userName,jdbcType=VARCHAR},
  #{password,jdbcType=VARCHAR},
  #{age,jdbcType=INTEGER})
</insert>

<update id="updateUser" parameterType="cn.yideng.mybatis.entity.User">
  update tbl_user set
  user_name= #{userName,jdbcType=VARCHAR},
  password = #{password,jdbcType=VARCHAR},
  age= #{age,jdbcType=INTEGER}
  where id= #{id,jdbcType=INTEGER}
</update>

<delete id="deleteUser" parameterType="java.lang.Integer">
  delete from tbl_user where id= #{id,jdbcType=INTEGER}
</delete>

</mapper>

Controller类

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

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

  @Autowired
  private UserService userService;

  @PostMapping(value = "/add")
  private void addUser(User user){
    userService.addUser(user);
  }

  @GetMapping("/getList")
  private List<User> getAllUser(){
    return userService.findAll();
  }

  @PutMapping(value = "update/{id}")
  private void updateUser(User user){
    userService.updateUser(user);
  }

  @DeleteMapping(value = "delete/{id}")
  private int deleteUser(Integer id){
    return userService.deleteUser(id);
  }

}


修改启动类,添加@MapperScan注解,使其可以扫描DAO层接口:

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
@EnableAutoConfiguration
@MapperScan("cn.yideng.mybatis.dao")
public class DemoApplication {

  public static void main(String[] args) {
  SpringApplication.run(DemoApplication.class, args);
  }
}


然后用postman 模拟测试,









































































































































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