3.2 mybatis.config.xml_properties_引入外部配置文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=shapolang

<?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>

<!--
mybatis可以使用properties来引入外部properties配置文件的内容
resource：引入类路径下的资源
url:映入网络路径或者磁盘路径下的资源
-->
<properties resource="properties-config.properties"></properties>

<!-- 在控制台打印sql语句 -->
<settings>
<setting name="logImpl" value="STDOUT_LOGGING"/>
</settings>

<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</dataSource>
</environment>
</environments>

<!-- 写好的sql映射文件一定要注册到全局配置文件中 -->
<mappers>
<mapper resource="com/mybatis/bean/EmployeeMapper.xml"/>
</mappers>
</configuration>