VIP23/04maven/mybatis/target/classes/mybatis-config.xml

<?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">
<configuration>
<!--引入外部资源
properties   通过这个标签去加载外部资源
resource：db.properties  去指定我们外部资源文件
${xxxx}:去获取外部资源文件中的属性值
-->
    <properties resource="db.properties"></properties>
    <settings>
        <!--        开启驼峰命名-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>

    </settings>

    <typeAliases>
        <typeAlias type="com.sf.entity.User" alias="user"></typeAlias>
        <typeAlias type="com.sf.entity.Book" alias="book"></typeAlias>
    </typeAliases>


    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
<!--                连接数据库的基本信息-->
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="${jdbc_url}"/>
                <property name="username" value="${jdbc_user}"/>
                <property name="password" value="${jdbc_password}"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
<!--        通过resource属性去加载.xml文件-->
        <mapper resource="UserMapper.xml"/>
<!--        通过注解的方式去操作数据库-->
        <mapper class="com.sf.mapper.UserMapper2"></mapper>
        <mapper resource="BookMapper.xml"></mapper>


    </mappers>
</configuration>