二、别名

1.可将数据库配置信息放入db.properties中；

//db.properties
driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/a?serverTimezone=UTC
username= root
password=admin

//conf.xml
<properties resource="db.properties">
</properties>
 
<dataSource type="POOLED">
	<property name="driver" value="${driver}"/>
    <property name="url" value="${url}"/>
    <property name="username" value="${username}"/>
    <property name="password" value="${password}"/>
</dataSource>
<environments default="development">
</environments>

2.设置别名：可用别名代替mapper.xml中的全类名

//conf.xml
<typeAliases>
	<typeAlias type="com.entity.Student" alias="Student"/>//type:全类名；alias：别名
 </typeAliases>
<environments default="development">
</environments>