Mapper-config.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE configuration

  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"

  "https://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>

  <environments default="development">

    <environment id="development">

      <transactionManager type="JDBC"/>

      <dataSource type="POOLED">

        <property name="driver" value="${driver}"/>

        <property name="url" value="${url}"/>

        <property name="username" value="${username}"/>

        <property name="password" value="${password}"/>

      </dataSource>

    </environment>

  </environments>

  <mappers>

    <mapper resource="org/mybatis/example/BlogMapper.xml"/>

  </mappers>

</configuration>