- Original Message -
From: bin cai [EMAIL PROTECTED]
To: mysql list [EMAIL PROTECTED]
Sent: Friday, May 17, 2002 10:59 AM
Subject: set connection as instance variable ( servlet and mysql)
Hi,
My application is about online exam with java servlet
as tool, tomcat 3.2.3 as server solution , mysql 3.49
as the backend.
considering 180 students take the exam at same time
within 50 minutes, there are a lot of transactions
with database.
what i did right now is to define connection in local
variable(within doGet or doPost method), every time
this servlet is called, new connection is created.
after transaction is done, this connection is closed.
I am worrying the speed.(it will comsume a lot
connection and time for open new connection).
so I am thinking to define connection as instance
variable in every servlet, so it can save sometime to
open new connection. However, I am not sure if it will
cause multi-thread problem? How and when i can close
the connection.
You should definitely use a connection pool. Sharing an instance of a
connection will work, but you will have performance problems, and it is
impossible to demarcate transactions when you do this.
If you upgrade to Tomcat-4, it has connection pooling built in. Otherwise
you might want to take a look at the commons project at
http://cvs.apache.org/viewcvs/jakarta-commons/dbcp/
-Mark
-
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