Databases
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PO
 

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    <p>A much better way of doing this is using a connection pool. You also need to ensure that you close the connections properly (is isn't clear from your code if this is happening, with a pool it still needs to be done). As for storing the connection, that is not really a good idea as your servlet is multithreaded (I learned this the hard way) and you would need to sychronize all accesses which would be a bit of a disaster . </p> <p><a href="http://geekexplains.blogspot.co.uk/2008/06/what-is-connection-pooling-why-do-we.html" rel="nofollow">http://geekexplains.blogspot.co.uk/2008/06/what-is-connection-pooling-why-do-we.html</a></p> <p><a href="http://confluence.atlassian.com/display/DOC/Configuring+a+PostgreSQL+Datasource+in+Apache+Tomcat" rel="nofollow">http://confluence.atlassian.com/display/DOC/Configuring+a+PostgreSQL+Datasource+in+Apache+Tomcat</a></p> <p><a href="http://www.devdaily.com/blog/post/java/how-configure-tomcat-dbcp-connection-pool-pooling-postgres" rel="nofollow">http://www.devdaily.com/blog/post/java/how-configure-tomcat-dbcp-connection-pool-pooling-postgres</a></p> <p>--EDIT-- Why not do it in "init()"?</p> <p>Learn about the "life cycle of a servlet". </p> <p>init() is only called once when the servlet is set up by the container.</p> <p>Each request is using the same servlet not a new instance for each request. So init() will not be called for a request.</p> <p>As each request is processed by the same servlet instance, your code needs to be multithreaded.</p>
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    1. POinitializing a database connection object once and reusing it - jboss
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    1. USJaydee
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    1. COCan this be done - create a result set as SCROLL_SENSITIVE and CONCUR_UPDATABLE in the init() method of the servlet. There will be no deleteion done in the servlet. Just it will be checked if the a particular entry is present in the table or not. SCROLL_SENSITIVE will ensure that any updates made will be reflected in the result set also. What is wrong with this idea?
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    2. CORead the link he puts.
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    3. CO@Jaydee : The init() method will be called only once. But a result set object created in init
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