在配置mybatis-config.xml中常見的錯(cuò)誤:
Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: ${com.mysql.cj.jdbc.Driver}
### The error may exist in UserMapper.xml
### The error may involve test.selectAll
### The error occurred while executing a query
### Cause: java.sql.SQLException: Error setting driver on UnpooledDataSource. Cause: java.lang.ClassNotFoundException: Cannot find class: ${com.mysql.cj.jdbc.Driver}

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解決方法:
1、在pom.xml文件中查看自己安裝的mysql和mysql驅(qū)動(dòng)jar包(mysql-connector-java)、mybatis是否版本匹配
2、將mybatis-config.xml中配置的數(shù)據(jù)庫信息,$和{}去掉

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