zyhui98 opened a new issue, #36966:
URL: https://github.com/apache/shardingsphere/issues/36966
## Question
if I use one proxy server, can it compatible with mysql5 and mysql8？
I try it
mysql 5 is ok, by mysql 8 is error:
`java.sql.SQLException: Unknown system variable 'query_cache_size'
at
com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
at
com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
at
com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
at
com.mysql.cj.jdbc.StatementImpl.executeInternal(StatementImpl.java:764)
at com.mysql.cj.jdbc.StatementImpl.execute(StatementImpl.java:781)
at
com.zaxxer.hikari.pool.ProxyStatement.execute(ProxyStatement.java:102)
at
com.zaxxer.hikari.pool.HikariProxyStatement.execute(HikariProxyStatement.java)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.executor.callback.impl.ProxyStatementExecutorCallback.execute(ProxyStatementExecutorCallback.java:42)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.executor.callback.ProxyJDBCExecutorCallback.executeSQL(ProxyJDBCExecutorCallback.java:75)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.executor.callback.ProxyJDBCExecutorCallback.executeSQL(ProxyJDBCExecutorCallback.java:68)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.executor.callback.ProxyJDBCExecutorCallback.executeSQL(ProxyJDBCExecutorCallback.java:45)
at
org.apache.shardingsphere.infra.executor.sql.execute.engine.driver.jdbc.JDBCExecutorCallback.execute(JDBCExecutorCallback.java:90)
at
org.apache.shardingsphere.infra.executor.sql.execute.engine.driver.jdbc.JDBCExecutorCallback.execute(JDBCExecutorCallback.java:69)
at
org.apache.shardingsphere.infra.executor.kernel.ExecutorEngine.syncExecute(ExecutorEngine.java:135)
at
org.apache.shardingsphere.infra.executor.kernel.ExecutorEngine.parallelExecute(ExecutorEngine.java:131)
at
org.apache.shardingsphere.infra.executor.kernel.ExecutorEngine.execute(ExecutorEngine.java:116)
at
org.apache.shardingsphere.infra.executor.sql.execute.engine.driver.jdbc.JDBCExecutor.execute(JDBCExecutor.java:67)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.executor.ProxyJDBCExecutor.execute(ProxyJDBCExecutor.java:75)
at
org.apache.shardingsphere.proxy.backend.communication.ProxySQLExecutor.useDriverToExecute(ProxySQLExecutor.java:229)
at
org.apache.shardingsphere.proxy.backend.communication.ProxySQLExecutor.doExecute(ProxySQLExecutor.java:186)
at
org.apache.shardingsphere.proxy.backend.communication.ProxySQLExecutor.execute(ProxySQLExecutor.java:151)
at
org.apache.shardingsphere.proxy.backend.communication.jdbc.JDBCDatabaseCommunicationEngine.execute(JDBCDatabaseCommunicationEngine.java:131)
at
org.apache.shardingsphere.proxy.backend.handler.data.impl.UnicastDatabaseBackendHandler.execute(UnicastDatabaseBackendHandler.java:76)
at
org.apache.shardingsphere.proxy.frontend.mysql.command.query.text.query.MySQLComQueryPacketExecutor.execute(MySQLComQueryPacketExecutor.java:94)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.executeCommand(CommandExecutorTask.java:111)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.run$original$lZvN1UxV(CommandExecutorTask.java:78)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask.run$original$lZvN1UxV$accessor$l6KQ4NAR(CommandExecutorTask.java)
at
org.apache.shardingsphere.proxy.frontend.command.CommandExecutorTask$auxiliary$XpKUdYcS.call(Unknown
Source)
at
org.apache.shardingsphere.agent.core.plugin.interceptor.InstanceMethodAroundInterceptor.intercept(InstanceMethodAroundInterceptor.java:75)`
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