在XML中构建SqlSessionFactory

<?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>

<environments default="development">

<environment id="development">

<transactionManager type="JDBC"/>

<dataSource type="POOLED">

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

<property name="url" vale="${url}">

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

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

</environment>

</environments>

<mappers>

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

</mappers>

</configuration>

environment 元素体中包含对事务管理和连接池的环境配置。mappers 元素是包含所有 mapper （映射器）的列表，这些 mapper的 XML 文件包含 SQL 代码和映射定义息。