整合数据库和mybaits

导入Mybaits相关依赖

<!--Mybaits & Mysql-->
        <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>
            <scope>runtime</scope>
        </dependency>
        <!--Mybaits & Mysql-->

修改配置文件

https://blog.csdn.net/iku5200/article/details/82856621

mysql JDBC URL格式如下：

jdbc:mysql://[host:port],[host:port].../[database][?参数名1][=参数值1][&参数名2][=参数值2]...

因为之前配置了h2数据库这里配置second-datasource.//最后测试的时候又改回去了把h2的url删了https://blog.csdn.net/tiantang_1986/article/details/95190788

server:
  port: 8080

spring:
  second-datasource:
    username: root
    password: 1234
    url: jdbc:mysql://localhost:3306/test_schema?useUnicode=true&characterEncoding=utf-8&useSSL=true&serverTimezone=UTC
    driver-class-name: com.mysql.jdbc.Driver

mybatis:
  mapper-locations: classpath:mapping/*Mapper.xml
  type-aliases-package: com.example.entity

创建实体类

建表：

CREATE TABLE `user` (
  `id` int(32) NOT NULL AUTO_INCREMENT,
  `userName` varchar(32) NOT NULL,
  `passWord` varchar(50) NOT NULL,
  `realName` varchar(32) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

D:\springbootdemo\src\main\java\cn\greenleaf\entity\User.java

package cn.greenleaf.entity;

/**
 * @Auther: Leon Liu
 * @Date: 2020/04/11/18:21
 * @Description:
 **/

public class User {
    private Integer id;
    private String userName;
    private String passWord;
    private String realName;

    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 getRealName() {
        return realName;
    }

    public void setRealName(String realName) {
        this.realName = realName;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", userName='" + userName + '\'' +
                ", passWord='" + passWord + '\'' +
                ", realName='" + realName + '\'' +
                '}';
    }
}

D:\springbootdemo\src\main\java\cn\greenleaf\controller\UserController.java

package cn.greenleaf.controller;

import cn.greenleaf.service.UserService;
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;

/**
 * @Auther: Leon Liu
 * @Date: 2020/04/11/18:27
 * @Description:
 **/

@RestController
@RequestMapping("/testBoot")
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("getUser/{id}")
    public String GetUser(@PathVariable int id) {
        return userService.Sel(id).toString();
    }

}

D:\springbootdemo\src\main\java\cn\greenleaf\service\UserService.java

package cn.greenleaf.service;

import cn.greenleaf.entity.User;
import cn.greenleaf.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @Auther: Leon Liu
 * @Date: 2020/04/11/18:28
 * @Description:
 **/

@Service
public class UserService {

    @Autowired
    UserMapper userMapper;

    public User Sel(int id) {
        return userMapper.Sel(id);

    }
}

D:\springbootdemo\src\main\java\cn\greenleaf\mapper\UserMapper.java

package cn.greenleaf.mapper;

import cn.greenleaf.entity.User;
import org.springframework.stereotype.Repository;

/**
 * @Auther: Leon Liu
 * @Date: 2020/04/11/18:29
 * @Description:
 **/
@Repository
public interface UserMapper {

    User Sel(int id);

}

D:\springbootdemo\src\main\resources\mapping\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="cn.greenleaf.mapper.UserMapper">

    <resultMap id="BaseResultMap" type="cn.greenleaf.entity.User">
        <result column="id" jdbcType="INTEGER" property="id" />
        <result column="userName" jdbcType="VARCHAR" property="userName" />
        <result column="passWord" jdbcType="VARCHAR" property="passWord" />
        <result column="realName" jdbcType="VARCHAR" property="realName" />
    </resultMap>

    <select id="Sel" resultType="cn.greenleaf.entity.User">
        select * from user where id = #{id}
    </select>

</mapper>

测试

浏览器输入http://localhost:8080/testBoot/getUser/1

返回：

User{id=1, userName='leo', passWord='123', realName=''}