liugddx commented on PR #4123:
URL: 
https://github.com/apache/incubator-seatunnel/pull/4123#issuecomment-1430736826

   > The connection get from connectionProvider, it will be closed when 
JdbcSinkWriter close by the code:
   > 
   > ```
   > outputFormat.close();
   > ```
   
   If the degree of parallelism is >1, does `pre_sql ` need to be executed 
multiple times?
   


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