mybatis的连接怎么手动关闭

用JDBC连接SQLite:
Class.forName("org.sqlite.JDBC");
Connection conn = DriverManager
.getConnection("jdbc:sqlite:/d:/sqlite.db");
Statement stat = conn.createStatement();
ResultSet r =stat.executeQuery("select * from student");
while(r.next())
{
System.out.println(r.getString("name"));
}
conn.close(); // 结束数据库的连接
FileUtils.forceDelete(new File("D:/sqlite.db"));
连接关闭，文件成功删除掉

用mybatis连接SQlite:

SqlSessionFactory factory = connectSQLite();
SqlSession session = factory.openSession();
List<Student> list = session.selectList("SQLiteTest.queryAllStudent");
session.getConnection().close();
FileUtils.forceDelete(new File("D:/sqlite.db"));

private static SqlSessionFactory connectSQLite() throws IOException
{
Reader reader = Resources.getResourceAsReader("SqlMapConfig.xml");
Properties proper = createSQLiteProperties();
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader,proper);
reader.close();
return factory;
}

private static Properties createSQLiteProperties()
{
Properties proper = new Properties();
proper.put("driver", "org.sqlite.JDBC");
proper.put("username", "");
proper.put("password", "");
proper.put("url", "jdbc:sqlite:/D:/sqlite.db");
return proper;
}

SqlMapConfig.xml
<configuration>
<environments default="Simple">
<environment id="Simple">
<transactionManager type="JDBC">
</transactionManager>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
<property name="url" value="${url}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="sqlMap/queryStudent.xml"></mapper>
</mappers>
</configuration>

java.io.IOException: Unable to delete file: D:\sqlite.db
我想问为什么删不掉？mybatis封装的JDBC，用的Connection连接的，Connection关闭，按理说是不应该有进程在占有这个文件的啊，JDBC关闭就可以直接删掉？mybatis关数据库连接的时候都需要关什么？不能手动关闭连接吗？