java - How to pass session variables in JDBC url properly? -

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I have to increase the group_concat_max_len I can not do this by prepaidment, and I can not even do it in mysql my.conf file .

I found on mysql documents that there is an option to pass the session variable in the URL. But there is no example, I tried to do this: 

  jdbc.url = jdbc: mysql: //xxxx.xx.xx.xx/dbName? SessionVariables = group_concat_max_len: 204800

and I have an exception: 

  com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: one in your SQL syntax Error is; Check the manual related to your MySQL server version for the correct syntax for using 'Nearest': 204800 'Line 1, and I also tried it like this:  
  jdbc.url = jdbc: mysql: //xxxx.xx.xx.xx/dbName? SessionVariables = group_concat_max_len, 204800  
 
 Because the official document says: 
 
  sessionVariables names / values ​​separated by a comma separated list as SET session Can be sent ... when the server connects the driver. Version: 3.1.8 to  
 
 Any ideas ???

Try it out: 

  jdbc.url = jdbc: mysql: //xxxx.xx.xx.xx/dbName? SessionVariables = group_concat_max_len = 204800

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