mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <properties resource="db.properties"></properties>


    <typeHandlers>
        <typeHandler handler="com.example.cuixiaowei.demo.MyTypeHandle"></typeHandler>
    </typeHandlers>
    <plugins>
        <plugin interceptor="com.example.cuixiaowei.demo.MyInterceptor">
        </plugin>
    </plugins>
    <!-- 环境，可以配置多个，default：指定采用哪个环境 -->
    <environments default="dev">
      <!-- id：唯一标识 -->
      <environment id="dev">
         <!-- 事务管理器，JDBC类型的事务管理器 -->
         <transactionManager type="JDBC" />
         <!-- 数据源，池类型的数据源 -->
         <dataSource type="POOLED">
            <property name="driver" value="${driver}" /> <!-- 配置了properties，所以可以直接引用 -->
            <property name="url" value="${url}" />
            <property name="username" value="${username}" />
            <property name="password" value="${password}" />
         </dataSource>
      </environment>
    </environments>
    <mappers>
        <mapper resource="MyMapper.xml" />
    </mappers>
</configuration>