1，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">
<!-- 填写自己的mysql用户名和密码， 还有连接的url要加上"?serverTimezone=GMT%2B8"不然会报错 -->
<configuration>
    <!--环境的配置...  -->
    <properties resource="jdbc-prod.properties"/>
    <settings>
        <!--其他配置...  -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!--其他配置...  -->
    </settings>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver" />
                <property name="url" value="${database.url}" />
                <property name="username" value="${database.username}" />
                <property name="password" value="${database.password}" />
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="mapper/ActionMapper.xml"/>
        <mapper resource="mapper/OperatorMapper.xml"/>
    </mappers>
</configuration>

database.url=jdbc:mysql://localhost:3306/demo?serverTimezone=GMT%2B8
database.username=root
database.password=