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database connection from servlet

 
sylvia greene
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I am using intializaton parameters in web.xml to make connection to database.

In HelloWorldServlet I do the following


Now i have made another servlet say AccountServlet which uses the same initialization parameters. Do i need to specify the same paramters within init-param in the AccountServlet entry in web.xml or is there a way to use the parameters i defined in HelloWorldServlet.
 
Jeroen Wenting
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parameters defined for one servlet are not available for another.
You can also define parameters in the servletContext which are visible to the entire web application.

Short sample from our web.xml:


context-param gets added to the servletContext, init-param (per servlet) to the servletConfig for that particular servlet.
The order of these sections is set in stone!
[ July 16, 2004: Message edited by: Jeroen Wenting ]
 
sylvia greene
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thanks Jeroen
 
Mark Spritzler
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One other thing to keep in mind. Now you are doing a test I assume, based on the name "HelloWorldServlet".

But in the future, you will want to remove Database work inside the actual Servlet code, you would want to seperate that out into another Java class, not a Servlet. The Servlet should only handle getting the Request, the parameters, the submitted request variables, and returning the response. All other business logic should be refactored outside of the actual Servlet class. This is a much cleaner architecture, and making sure that the responsibility of the Servlet, is handling the response and request objects.

Mark
 
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