spring boot+mybatis常见使用

1. 下载默认项目，spring项目初始化，并添加依赖包，如下图:

2. 添加jdbc数据源配置和映射文件application.properties：

spring.application.name=mydemo
logging.path=./logs
spring.datasource.url=jdbc:mysql://localhost/jpa?serverTimezone=UTC&useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
server.port=8801
mybatis.type-aliases-package=com.mybatis.springBoot.pojo
mybatis.mapper-locations=classpath:mapper/*.xml

3.新建pojo对象

需要application.properties配置扫描alias声明包mybatis.type-aliases-package=com.mybatis.springBoot.pojo，否则@Alias("user")不生效

package com.mybatis.springBoot.pojo;

import org.apache.ibatis.type.Alias;

@Alias("user")
public class User {
    private int id;
    private String userName;
    private int sex;
    private int age;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }
    public int getSex() {
        return sex;
    }
    public void setSex(int sex) {
        this.sex = sex;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
}

4.新建mapper映射接口

package com.mybatis.springBoot.mapper;

import com.mybatis.springBoot.pojo.User;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface UserMapper {
    int insertUser(User user);
}

5.在resources目录新建mapper目录，新建xml文件UserMapper.xml,内容如下

需要声明扫描文件，否则不生效mybatis.mapper-locations=classpath:mapper/*.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.mybatis.springBoot.mapper.UserMapper">
    <resultMap id="userMap" type="user">
        <result column="id" property="id"/>
        <result column="username" property="userName"/>
        <result column="age" property="age"/>
        <result column="sex" property="sex"/>
    </resultMap>
    <insert id="insertUser" parameterType="user" useGeneratedKeys="true" keyProperty="id">
        insert into user(username,sex,age) value(#{userName},#{sex},#{age})
    </insert>
</mapper>

6. 编写测试类

@Autowired
private UserMapper userMapper;

@Test
public void insertUser() {
    User user = new User();
    user.setAge(100);
    user.setSex(3);
    user.setUserName("机器人");
    userMapper.insertUser(user);
    System.out.println(user.getId());
}

7. mvc三层模式

7.1新建service接口

package com.mybatis.springBoot.service;

import com.mybatis.springBoot.pojo.User;

public interface IUserService {
    int insertUser(User user);
}

7.2新建实现类

package com.mybatis.springBoot.service.impl;

import com.mybatis.springBoot.mapper.UserMapper;
import com.mybatis.springBoot.pojo.User;
import com.mybatis.springBoot.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
@Transactional
public class UserServiceImpl implements IUserService {
    @Autowired
    private UserMapper userMapper;

    @Override
    public int insertUser(User user) {
        userMapper.insertUser(user);
        return user.getId();
    }
}

7.3新建controller调用

package com.mybatis.springBoot.controller;

import com.mybatis.springBoot.pojo.User;
import com.mybatis.springBoot.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private IUserService iUserService;

    @RequestMapping("/insertUser")
    int insertUser(User user) {
        return iUserService.insertUser(user);
    }
}

7.4 新建测试类

package com.mybatis.springBoot;

import com.mybatis.springBoot.mapper.UserMapper;
import com.mybatis.springBoot.pojo.User;
import org.json.JSONObject;
import org.junit.Before;
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.http.MediaType;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.ResultActions;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.context.WebApplicationContext;

@RunWith(SpringRunner.class)
@WebAppConfiguration
@SpringBootTest
public class ApplicationTests {
    @Autowired
    private WebApplicationContext webApplicationContext;

    private MockMvc mockMvc;
    @Autowired
    private UserMapper userMapper;

    @Before
    public void setMockMvc() {
        mockMvc = MockMvcBuilders.webAppContextSetup(webApplicationContext).build();
    }

    @Test
    public void testUser() {
        try {
            ResultActions resultActions =
                    mockMvc.perform(MockMvcRequestBuilders.post("/user/insertUser")
                            .param("sex", "12")
                            .param("userName", "张三"));
            MvcResult mvcResult = resultActions.andReturn();
            byte[] resultByte = mvcResult.getResponse().getContentAsByteArray();
            System.out.println(new String(resultByte));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Test
    public void insertUser() {
        User user = new User();
        user.setAge(100);
        user.setSex(3);
        user.setUserName("机器人");
        userMapper.insertUser(user);
        System.out.println(user.getId());
    }

}

spring boot+mybatis常见使用

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