[大数据]mybatis中jdbc的properties文件加载

1.编写jdbc.properties

db.username=root
db.password=123
db.driver=com.mysql.cj.jdbc.Driver
db.url=jdbc:mysql:///mydb?serverTimezone=Asia/Shanghai

2.在mybatis-config.xml加载jdbc.properties

<environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${db.driver}"/>
                <property name="url" value="${db.url}"/>
                <property name="username" value="${db.username}"/>
                <property name="password" value="${db.password}"/>
            </dataSource>
        </environment>
    </environments>