idea中spring-boot整合mybatis,使用application.yaml文件配置mysql

总体的包结构如下：

pom文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.yixuan</groupId>
    <artifactId>spring-boot-05-mybaits</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-boot-05-mybaits</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

pojo下的User.java文件

package com.yixuan.pojo;


import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private  int id;
    private String name;
}

datasource:

数据文件：

application.yaml文件

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

    #整合mybatis
mybatis:
  type-aliases-package: com.yixuan.pojo
  mapper-locations: classpath:mybatis/mapper/*.xml       # mapper映射文件

mapper下的UserMapper.java文件

package com.yixuan.mapper;

import com.yixuan.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
@Repository
public interface UserMapper {
    List<User> queryUserList();

    User queryUserById(int id);

    int addUser(User user);

    int updateUser(User user);

    int deleteUser(int id);
}

controller下的UserController.java文件

package com.yixuan.controller;

import com.yixuan.mapper.UserMapper;
import com.yixuan.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class UserController {

    @Autowired
    private UserMapper userMapper;
    //查询用户列表
    @GetMapping("/queryUserList")
    public List<User> queryUserList(){
        List<User> userList = userMapper.queryUserList();
        for(User user:userList){
            System.out.println(user);
        }
        return userList;
    }
    //增加一个用户
    @GetMapping("/addUser")
    public String addUser(){
        userMapper.addUser(new User(6,"小三"));
        return  "ok";
    }
    //修改一个用户
    @GetMapping("/updateUser")
    public String updateUser(){
        userMapper.updateUser(new User(2,"小王"));
        return "ok";
    }
    //删除一个用户
    @GetMapping("deleteUser")
    public String deleteUser(){
        userMapper.deleteUser(5);
        return "ok";
    }
    @GetMapping("queryUserById")
    public User queryUserById(){
        User user = userMapper.queryUserById(2);
        System.out.println(user);
        return user;
    }

}

resource下的mybatis->mapper->UserMapper.xml文件

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

    <select id="queryUserById" resultType="User" >
      select * from user where id =#{id}
   </select>

    <insert id="addUser" parameterType="User">
      insert into User (id ,name) value  (#{id},#{name})
   </insert>

    <update id="updateUser" parameterType="User">
      update user set name =#{name} where id =#{id}
   </update>

    <delete id="deleteUser" parameterType="int">
      delete from user where id = #{id}
   </delete>

</mapper>

测试界面：