But the code you posted does not create a new DataSource object. It
just gets a reference to an existing one stored in JNDI. Nothing new
about the DataSource object. Note the lack of a new operator.
--David
Rashmi Rubdi wrote:
On 4/27/07, albrecht andrzejewski <[EMAIL PROTECTED]> wrote:
>> 3) In my servlet init(), I lookup the data-source. Each lookup
essentially
>> instantiates an instance of the data-source. So a connection pool
gets
>> instantiated in each servlet's init.
>>
>> Now it doesn't make sense to create a new connection pool in each
servlet.
>> So I'd like to create a single connection pool that will be used
by all
>> servlets. I've been looking thru the tomcat docs, to see where I
could
>> create this central resource for my webapp. The only option I've
seen so far
>> is to create my own life-cycle listener for my webapp. That way I
can create
>> a connection pool on start-up. I was wondering if there was a
better way to
>> do this ?
It's actually your container which create the connection pool and not
your servlet. What you do when you are looking up is just finding a
reference to the pre-existing datasource. So don't worry
Hi Ali,
Thank you for the above post, I agree with it.
Normally one has to write the following lines to get the database
connection from the connection pool:
Context initContext = new InitialContext(); //(1)
Context envContext =
(Context)initContext.lookup("java:/comp/env"); //(2)
DataSource ds = (DataSource)envContext.lookup("jdbc/TestDB");
//(3)
conn = ds.getConnection(); //(4)
I think most people try to initialize the DataSource object in the
above code, when Tomcat starts up and they only wan to get the ds
object in a DAO class before creating a new connection from the
connection pool.
I think Srinivas wants to create the ds object when Tomcat starts up
and re-use the ds object in the DAO class instead of re-creating it
each time he needs it inside a DAO.
and please do
not write your own lifecycle :-)
Regards, Ali.
-Regards
Rashmi
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