从18年开始到现在,项目的开发都是用的框架都是Springboot,而对象关系框架先是用的SpringData JPA,今年的新项目又用了Mybatis。两者虽然整合方式不同,但是使用起来却很相似。刚好一直想写一篇关于Springboot的文章,所以就结合最近做的项目,把Springboot集成Mybatis的步骤大体讲一下。
1、首先新建一个springboot项目,名字就叫batis吧,springboot的版本就用2.0.5.RELEASE。
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.5.RELEASE</version>
<relativePath/>
</parent>
2、导入相应的jar包
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!-- mysql -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!-- mybatis -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.1</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
3、新建User实体类
import lombok.Data;
import lombok.ToString;
import java.io.Serializable;
@Data
@ToString
public class User implements Serializable {
private Integer id;
private String userName;
private Integer userAge;
}
4、新建UserMapper类,并新增查询用户sel方法,新增用户add方法
import com.batis.model.User;
import org.springframework.stereotype.Repository;
@Repository
public interface UserMapper {
User sel(int id);
void add(User user);
}
5、在资源目录resources下新建mapping目录,并创建UserMapping.xml文件,配置相应的sel、add方法
<?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.batis.mapper.UserMapper">
<resultMap id="BaseResultMap" type="com.batis.model.User">
<result column="id" jdbcType="INTEGER" property="id" />
<result column="user_name" jdbcType="VARCHAR" property="userName" />
<result column="user_age" jdbcType="INTEGER" property="userAge" />
</resultMap>
<sql id="baseSql">
select id, user_name, user_age from user
</sql>
<select id="sel" resultMap="BaseResultMap" parameterType="java.lang.Integer">
<include refid="baseSql"/> where id = #{id}
</select>
<insert id="add" parameterType="com.batis.model.User">
INSERT INTO user(user_name, user_age) VALUES (#{userName}, #{userAge});
</insert>
</mapper>
6、在启动类新增注解@MapperScan,指定mapper文件的扫描目录,否则会报错Field userMapper in com.batis.service.impl.UserServiceImpl required a bean of type ‘com.batis.mapper.UserMapper’ that could not be found.
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@MapperScan("com.batis.mapper")
@SpringBootApplication
public class BatisApplication {
public static void main(String[] args) {
SpringApplication.run(BatisApplication.class, args);
}
}
7、在resources目录的application.properties配置文件下新增mysql数据库配置和mybatis配置
server.port=8080
# mysql数据库配置
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
# mybatis配置
# Mapper文件存放目录
mybatis.mapper-locations=classpath:mapping/*Mapping.xml
8、创建UserService接口类和实现类UserServiceImpl
import com.batis.model.User;
public interface UserService {
public User sel(int id);
public void add(User user);
}
import com.batis.mapper.UserMapper;
import com.batis.model.User;
import com.batis.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public User sel(int id) {
return userMapper.sel(id);
}
@Override
public void add(User user) {
userMapper.add(user);
}
}
9、创建控制器类UserController
import com.batis.model.User;
import com.batis.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping(value = "/getUser/{id}", method = RequestMethod.GET)
public String getUser(@PathVariable int id) {
return userService.sel(id).toString();
}
@RequestMapping(value = "/addUser", method = RequestMethod.POST, produces = "application/json;charset=UTF-8")
public String addUser(@RequestBody User user) {
try {
userService.add(user);
} catch (Exception e) {
e.printStackTrace();
return "error";
}
return "success";
}
}
10、在mysql的test库下创建user表
CREATE TABLE `user` (
`id` INT(32) NOT NULL AUTO_INCREMENT,
`user_name` VARCHAR(32) NOT NULL,
`user_age` INT(3) NOT NULL,
PRIMARY KEY (`id`) USING BTREE
)
11、启动batis项目并使用postman测试
新增用户:
查询用户:
至此Springboot集成Mybatis已经全部完成,测试也非常成功,是不是很简单!
有可以改进的地方希望诸位同学不要吝惜笔墨,加以指正,万分感谢!