MyBatis 连接 数据库 报错 ### Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Caus

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### Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: ${jdbc.driver}

我这里是因为没有在mybatis-config.xml中配置
在<configuration>下添加  <properties resource="db.properties" />即可