Databases
StackOverflow2013
Postsdbo
PO
 

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    <p>I see this issue come up a lot. Yes, Tomcat 7 does automatically deregister it, but it that REALLY taking control of your code and a good coding practice? Surely YOU want to know that you have all the correct code in place to close all your objects, shut down database connection pool threads, and get rid of all warnings. I certainly do.</p> <p>This is how I do it.</p> <p><strong>Step 1: Register a Listener</strong></p> <p><em>web.xml</em></p> <pre><code>&lt;listener&gt; &lt;listener-class&gt;com.mysite.MySpecialListener&lt;/listener-class&gt; &lt;/listener&gt; </code></pre> <p><strong>Step 2: Implement the Listener</strong></p> <p><em>com.mysite.MySpecialListener.java</em></p> <pre><code>public class MySpecialListener implements ServletContextListener { @Override public void contextInitialized(ServletContextEvent sce) { // On Application Startup, please… // Usually I'll make a singleton in here, set up my pool, etc. } @Override public void contextDestroyed(ServletContextEvent sce) { // On Application Shutdown, please… // 1. Go fetch that DataSource Context initContext = new InitialContext(); Context envContext = (Context)initContext.lookup("java:/comp/env"); DataSource datasource = (DataSource)envContext.lookup("jdbc/database"); // 2. Deregister Driver try { java.sql.Driver mySqlDriver = DriverManager.getDriver("jdbc:mysql://localhost:3306/"); DriverManager.deregisterDriver(mySqlDriver); } catch (SQLException ex) { logger.info("Could not deregister driver:".concat(ex.getMessage())); } // 3. For added safety, remove the reference to dataSource for GC to enjoy. dataSource = null; } } </code></pre> <p>Please feel free to comment and/or add...</p>
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    1. POTo prevent a memory leak, the JDBC Driver has been forcibly unregistered
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    1. COIt looks so lovely when your application ends and your logs just say: [INFO]Shutting down application. [INFO]Closing connection pool. [INFO]Deregistering MySQLDriver. [INFO]Closing Log FileHandler.
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    2. COBut `DataSource` does NOT have a `close` method
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    3. COYes, there is no method close() for DataSource.
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      1. USSangram Anand
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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