1 环境搭建

1.1 相关依赖

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<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis</artifactId>
  <version>3.5.13</version>
</dependency>

<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>8.0.33</version>
</dependency>

<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.13.2</version>
  <scope>test</scope>
</dependency>

<dependency>
  <groupId>org.projectlombok</groupId>
  <artifactId>lombok</artifactId>
  <version>1.18.26</version>
</dependency>

1.2 核心配置文件

resources/mybatis-config.xml

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<!DOCTYPE configuration
    PUBLIC "-//mybatis.org//DTD Config 3.0 //EN"
    "http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>
  <!-- 设置连接数据库的环境 -->
  <environments default="development">
    <environment id="development">
      <transactionManager type="JDBC"/>
      <dataSource type="POOLED">
        <property name="driver" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/myBatis_example"/>
        <property name="username" value="example"/>
        <property name="password" value="123456"/>
      </dataSource>
    </environment>
  </environments>
  <!-- 引入映射文件 -->
  <mappers>
    <mapper resource="mappers/UserMapper.xml"/>
  </mappers>
</configuration>

1.3 创建 Mapper 接口