mybatis配置文件的一些操作

一.mybatis-config.xml 主要负责连接数据库,和一些配置

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
  PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "https://mybatis.org/dtd/mybatis-3-config.dtd">
<!-- 使用propertys 引入外部文件 source引入类文件 URL 网络或磁盘 <setings >标签 -->

<configuration>
	<properties resource="conf.properties"></properties>
	<settings>
		<!-- 开启驼峰命名 A_Name映射为aName -->
		<setting name="mapUnderscoreToCamelCase" value="true" />
	</settings>
	<!-- 别名处理器 -->
	<typeAliases>
		<!-- 默认命名为类名小写 employee -->
		<typeAlias type="com.cws.mybatis.bean.Employee" />
	</typeAliases>
	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			<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>
	<!-- 注册配置文件 -->
	<mappers>
		<mapper resource="EmployeeMapper.xml" />
	</mappers>
</configuration> <?xm