I set up my postgresql database, master for write, the other for read using 
the following:

DB=Sequel.postgres('postgres://master_server/database',   
 :servers=>{:read_only=>{:host=>'slave_server'}})

now when i execute sqls within a transaction, it didn't behave correct.

DB.transaction do
   DB["update XX set age = 22 where id = 3"].update
   DB["select age from XX where id = 3"].first
end

the second sql didn't return age: 22, So i guess the update sql and select 
sql been executed on different databases, maybe update on master and query 
on slave, is it possible?

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