Mybatis属性配置

• 创建数据库配置文件（db.properties）

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://192.168.137.100:3306/mybatis?useSSL=false&useUnicode=true&characterEncoding=UTF-8&allowPublicKeyRetrieval=true

• 引入配置文件以及使用内部属性配置

<?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核心配置文件-->
<configuration>
    <properties resource="db.properties">
        <!--外部优先级更高-->
        <property name="username" value="root"/>
        <property name="password" value="root"/>
    </properties>
    <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>
    <mappers>
        <mapper resource="com/kuang/dao/UserMapper.xml"/>
    </mappers>
</configuration>