優化MyBatis配置

一、將數據庫連接信息分開寫在db.properties文件中

二、配置myBatisConfig.xml文件

<?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>
	<!-- 引入配置數據源的資源文件 -->
	<properties resource="db.properties"></properties>
	
	<!-- 配置開發環境 -->
	<environments default="development">
		<environment id="development">
			<!-- 配置事務管理器 -->
			<transactionManager type="JDBC" />
			<!-- 配置數據源連接池 -->
			<dataSource type="POOLED">
				<property name="driver" value="${driver}"/>
				<property name="url" value="${url}"/>
				<property name="username" value="${username}"/>
				<property name="password" value="${password}"/>
			</dataSource>
		</environment>
	</environments>
	
	<!-- 配置sql語句映射文件-->
	<mappers>
		<mapper resource="com/mingde/mapper/Empmapper.xml" />
		
	</mappers> 
</configuration>