{conn-10007, pstmt-20029} enter cache 控制台经常打印出这个，是啥意思啊？？？
一个项目启动之后，控制台有很多打印信息，特别是这一行：{conn-10007, pstmt-20029} enter cache
有人知道这是什么意思吗？
2019-04-24 13:35:08.122 [pool-2-thread-2] DEBUG [] - Transaction synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@a3e11ae]
2019-04-24 13:35:08.122 [pool-2-thread-1] DEBUG [] - Transaction synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@669eb7be]
2019-04-24 13:35:08.171 [logsvc-Scheduler_Worker-2] DEBUG [] - {conn-10010, pstmt-20033} enter cache
2019-04-24 13:35:08.172 [logsvc-Scheduler_Worker-2] DEBUG [] - {conn-10010, pstmt-20034} enter cache
2019-04-24 13:35:08.173 [logsvc-Scheduler_Worker-1] DEBUG [] - {conn-10007, pstmt-20029} enter cache
2019-04-24 13:35:08.174 [logsvc-Scheduler_Worker-1] DEBUG [] - {conn-10007, pstmt-20035} enter cache
2019-04-24 13:35:08.176 [logsvc-Scheduler_Worker-1] DEBUG [] - {conn-10007, pstmt-20036} enter cache
2019-04-24 13:35:08.176 [logsvc-Scheduler_Worker-1] DEBUG [] - {conn-10007, pstmt-20037} enter cache
2019-04-24 13:35:08.238 [logsvc-Scheduler_QuartzSchedulerThread] DEBUG [] - {conn-10008, pstmt-20038} enter cache
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