springboot集成mybatis

 

1、创建一个springboot项目




2、在pom.xml文件中添加mybatis的起步依赖

<!--mybatis起步依赖-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.1.1</version>
</dependency>

3、添加数据库驱动坐标，对应的版本不用导，应为对用的maven已经有对应的坐标

<!--MySQL连接驱动-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

4、在application.properties文件中配置数据库连接信息（在此key值是不能乱写的不然springboot无法识别，得去下图所示的json文件中查找，找得到的便是可以用的key,不过一般的编译工具都有提示功能）

#数据库连接信息

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=12345678

5、在application.properties文件中配置配置mybatis的信息

#配置mybatis的信息
#扫描包
mybatis.type-aliases-package=com.springboot
#加载mybatis映射文件
mybatis.mapper-locations=classpath:mapper/*Mapper.xml

至此springboot集成mybatis就完成了

6、编写测试代码

在src.main.java.com.springboot路径下新建domain包，在包中新建User类，
代码如下

package com.springboot.domain;

public class User {
    private Integer id;
    private String username;
    private String password;
    private String name;

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", name='" + name + '\'' +
                '}';
    }

    public Integer getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

在src.main.resources路径下新建mapper包，在包中新建UserMapper.xml，
代码如下

<?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.springboot.mapper.UserMapper">
    <select id="queryUserList" resultType="user">
        select * from user
    </select>
</mapper>

在src.main.java.com.springboot路径下新建mapper包，在包中新建UserMapper接口，
代码如下

package com.springboot.mapper;

import com.springboot.domain.User;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;
@Mapper
public interface UserMapper {
    public List<User> queryUserList();
}

 

在src.main.java.com.springboot路径下新建controller包，在包中新建MybatisController，
代码如下

package com.springboot.controller;

import com.springboot.domain.User;
import com.springboot.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;

@Controller
public class MybatisController {
    @Autowired
    private UserMapper userMapper;

    @RequestMapping("/query")
    @ResponseBody
    public List<User> queryUserList(){
        List<User> users=userMapper.queryUserList();
        return users;
    }
}

user表的建表语句

create table user(
id int(11) not null AUTO_INCREMENT,
username varchar(50) default null,
password varchar(50) default null,
name varchar(50) default null,
primary key(id)
)ENGINE=INNODB AUTO_INCREMENT=10 default charset=utf8;

insert into user values(1,'zhangsan','123','张三');
insert into user values(2,'lisi','123','李四');

7、开始测试
在浏览器中输入http://localhost:8080/query，结果如下图

则说明测试成功。