spring boot 2整合mybatis

其他 2019-06-17 20:28:39 阅读次数: 0

mybatis-spring-boot-starter主要有两种解决方案，一种是使用注解，一种是使用XML。

参考这篇文章动手跑了一个例子，稍微不同之处，原文是spring boot，这里改成了spring boot 2，mybatis现在最新版本为1.3.2。

一、使用注解

1、添加相关maven文件

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        
        <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>1.3.2</version>
        </dependency>
                
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

mybatis-spring-boot-starter最新版本可在官网查询
http://www.mybatis.org/spring-boot-starter/mybatis-spring-boot-autoconfigure/index.html

2、application.properties 添加相关配置

mybatis.type-aliases-package = com.example.demo.entity

spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password =

3、实体类User.java

package com.example.demo.entity;

import com.example.demo.enums.UserSexEnum;

public class User {
	public User() {
		super();
	}
	
	public User(String name, UserSexEnum sex) {
		super();
		this.name = name;
		this.sex = sex;
	}
	
    private Integer id;

    private String name;

    private UserSexEnum sex;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name == null ? null : name.trim();
    }

    public UserSexEnum  getSex() {
        return sex;
    }

    public void setSex(UserSexEnum  sex) {
        this.sex = sex;
    } 
    
    @Override
	public String toString() {
		return "name " + this.name + ", sex " + this.sex;
	}
}

4、枚举UserSexEnum.java

package com.example.demo.enums;

public enum UserSexEnum {
	MAN, 
	WOMAN
}

5、启动类中添加对mapper包扫描@MapperScan，这样就不需要在每个Mapper类上面添加注解@Mapper。


package com.example.demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

@SpringBootApplication
@MapperScan("com.example.demo.mapper")
public class DemoApplication extends SpringBootServletInitializer {
	
	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}
}

6、开发Mapper

package com.example.demo.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Result;
import org.apache.ibatis.annotations.Results;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import com.example.demo.entity.User;
import com.example.demo.enums.UserSexEnum;

public interface UserMapper {
	@Select("SELECT * FROM user")
       //结果集，关联实体类属性和数据库字段一一对应，如果两边一致，就不需要这个属性来修饰。
	@Results({		
		@Result(property = "sex",  column = "sex", javaType = UserSexEnum.class),
	})
	List<User> getAll();
	
	@Select("SELECT * FROM user WHERE id = #{id}")
	@Results({
		@Result(property = "sex",  column = "sex", javaType = UserSexEnum.class),
	})
	User getOne(Long id);

	@Insert("INSERT INTO user(name,sex) VALUES(#{name}, #{sex})")
	void insert(User user);

	@Update("UPDATE user SET name=#{name} WHERE id =#{id}")
	void update(User user);

	@Delete("DELETE FROM user WHERE id =#{id}")
	void delete(Long id);
}

7、单元测试


package com.example.demo.mapper;

import java.util.List;

import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import com.example.demo.entity.User;
import com.example.demo.enums.UserSexEnum;

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserMapperTest {

	@Autowired
	private UserMapper UserMapper;

	@Test
	public void testInsert() throws Exception {
		UserMapper.insert(new User("aa", UserSexEnum.MAN));
		UserMapper.insert(new User("bb", UserSexEnum.WOMAN));
		UserMapper.insert(new User("cc", UserSexEnum.WOMAN));

		Assert.assertEquals(3, UserMapper.getAll().size());
	}

	@Test
	public void testQuery() throws Exception {
		List<User> users = UserMapper.getAll();
		if(users==null || users.size()==0){
			System.out.println("is null");
		}else{
			System.out.println(users.toString());
		}
	}
	
	
	@Test
	public void testUpdate() throws Exception {
		User user = UserMapper.getOne(6l);
		System.out.println(user.toString());
		user.setName("dd");
		UserMapper.update(user);
		Assert.assertTrue(("dd".equals(UserMapper.getOne(6l).getName())));
	}

}

8、控制层

package com.example.demo.web;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.example.demo.entity.User;
import com.example.demo.mapper.UserMapper;

@RestController
public class UserController {
	@Autowired
	private UserMapper userMapper;
	
	@RequestMapping("/getUsers")
	public List<User> getUsers() {
		List<User> users=userMapper.getAll();
		return users;
	}
	
    @RequestMapping("/getUser")
    public User getUser(Long id) {
    	User user=userMapper.getOne(id);
        return user;
    }
    
    @RequestMapping("/add")
    public void save(User user) {
    	userMapper.insert(user);
    }
    
    @RequestMapping(value="update")
    public void update(User user) {
    	userMapper.update(user);
    }
    
    @RequestMapping(value="/delete/{id}")
    public void delete(@PathVariable("id") Long id) {
    	userMapper.delete(id);
    }
}

项目目录结构：

二、使用XML

1、application.properties新增以下配置

mybatis.config-location = classpath:mybatis/mybatis-config.xml
mybatis.mapper-locations = classpath:mybatis/mapper/*.xml

2、在resources/mybatis目录下添加mybatis-config.xml配置

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<settings>
        <!-- 控制台打印查询语句 -->
        <setting name="logImpl" value="STDOUT_LOGGING" />
    </settings>
	<typeAliases>
		<typeAlias alias="Integer" type="java.lang.Integer" />
		<typeAlias alias="Long" type="java.lang.Long" />
		<typeAlias alias="HashMap" type="java.util.HashMap" />
		<typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" />
		<typeAlias alias="ArrayList" type="java.util.ArrayList" />
		<typeAlias alias="LinkedList" type="java.util.LinkedList" />
	</typeAliases>
</configuration>

3、在resources/mybatis/mapper目录下添加映射文件UserMapper.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="com.example.demo.mapper.UserMapper" >
    <resultMap id="BaseResultMap" type="com.example.demo.entity.User" >
        <id column="id" property="id" jdbcType="BIGINT" />
        <result column="name" property="name" jdbcType="VARCHAR" />
        <result column="sex" property="sex" javaType="com.example.demo.enums.UserSexEnum"/>
    </resultMap>
    
    <sql id="Base_Column_List" >
        id, name, sex
    </sql>

    <select id="getAll" resultMap="BaseResultMap"  >
       SELECT 
       <include refid="Base_Column_List" />
	   FROM user
    </select>

    <select id="getOne" parameterType="java.lang.Long" resultMap="BaseResultMap" >
        SELECT 
       <include refid="Base_Column_List" />
	   FROM user
	   WHERE id = #{id}
    </select>

    <insert id="insert" parameterType="com.example.demo.entity.User" >
       INSERT INTO 
       		user
       		(name,sex) 
       	VALUES
       		(#{name},  #{sex})
    </insert>
    
    <update id="update" parameterType="com.example.demo.entity.User" >
       UPDATE 
       		user 
       SET        
       	name = #{name}
       WHERE 
       		id = #{id}
    </update>
    
    <delete id="delete" parameterType="java.lang.Long" >
       DELETE FROM
       		 user 
       WHERE 
       		 id =#{id}
    </delete>

</mapper>

4、编写Dao层的代码


package com.example.demo.mapper;

import java.util.List;

import com.example.demo.entity.User;

public interface UserMapper {
	
	List<User> getAll();
	
	User getOne(Long id);

	void insert(User user);

	void update(User user);

	void delete(Long id);
}

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