mybatis-config.xml配置

<?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>
<!--    引入外部配置文件(外部db.properties   优先级高) -->
    <properties resource="db.properties"/>



<!--    别名-->
    <typeAliases>
        <typeAlias type="com.kuang.pojo.User" alias="User"/>

       <!--  方法2
         <package name="com.kuang.pojo"/>
        默认首字母小写的  user     扫描包的，适于包太多，与第一种相反  -->
    </typeAliases>


<!--    改这儿切换环境    <environments default="development">     -->
    <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="${username}"/>
                <property name="password" value="${pwd}"/>
            </dataSource>
        </environment>

        <environment id="test">
            <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>


    <!--每一个Mapper. XML都需要在Mybatis核心配置文件中注册! -->
    <mappers>
        <mapper resource="com/kuang/dao/UserMapper.xml"/>
    </mappers>

</configuration>