Q: Exception on accessing the database connection: Unknown system variable ‘query_cache_size’
Unknown system variable ‘tx_read_only’
A: 升级Mysql驱动版本，之前是6.0.5版本<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.15</version></dependency>
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