SpringBoot2.5.6集成mybatis

1.应用依赖

<dependency>
     <groupId>org.mybatis.spring.boot</groupId>
     <artifactId>mybatis-spring-boot-starter</artifactId>
     <version>2.2.0</version>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
   <groupId>com.alibaba</groupId>
   <artifactId>druid-spring-boot-starter</artifactId>
   <version>1.2.8</version>
</dependency>

2.application.yml配置

spring:
  datasource:
    username: root
    password: 123456
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf8&allowPublicKeyRetrieval=true&useSSL=false&serverTimezone=Asia/Shanghai
    #type: com.alibaba.druid.pool.DruidDataSource
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      # 链接池初始化大小
      initial-size: 8
      # 最大活跃数
      max-active: 16
      # 最小空闲数
      min-idle: 1
      # 最大等待时间
      max-wait: 60000
  #指定MyBatis映射文件的路径
mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.pab.data.datasource.entity

3.mapper 类

@Mapper
public interface UserMapper {

    public List<User> queryUserList();

}

4.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.pab.data.datasource.mapper.UserMapper">
    <resultMap id="BaseResultMap" type="com.pab.data.datasource.entity.User">
        <!--
          column 数据库中的字段名称
          property 映射对象的属性名称
          jdbcType 列在数据库中字段的类型（可以省略不写）
        -->
        <id column="id" jdbcType="INTEGER" property="id" />
        <result column="username" jdbcType="VARCHAR" property="username" />
        <result column="password" jdbcType="VARCHAR" property="password" />
        <result column="name" jdbcType="VARCHAR" property="name" />
    </resultMap>
    <select id="queryUserList" resultMap="BaseResultMap">
        select * from user
    </select>
</mapper>