补充---Mybatis的配置文件中的settings和typeAliases标签

mybatis中的全局配置文件：
     在配置文件中写配置一定要注意标签的先后顺序，顺序不对则配置文件不能运行
xml version="1.0" encoding="UTF-8" ?>
 configuration
 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
 "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

 <settings>
 
 <setting name="cacheEnabled" value="true"/>
 
 <setting name="logImpl" value="STDOUT_LOGGING"/>
 settings>

 
 <typeAliases>
 <typeAlias type="com.aaa.entity.Dept" alias="Dept"/>
 <typeAlias type="com.aaa.entity.Emp" alias="Emp"/>
 typeAliases>

 <environments default="mysql">
 
 <environment id="mysql">
 <transactionManager type="JDBC"/>
 
 <dataSource type="POOLED">
 <property name="driver" value="com.mysql.jdbc.Driver"/>
 
 <property name="url" value="jdbc:mysql://localhost:3306/hbb?allowMultiQueries=true"/>
 <property name="username" value="root"/>
 <property name="password" value="123456"/>
 dataSource>
 environment>
 environments>

 <mappers>
 <mapper resource="com/aaa/dao/DeptMapper.xml"/>
 <mapper resource="com/aaa/dao/EmpMapper.xml"/>
 mappers>

configuration>