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POHow to update tables from back end that it reflects in retrieved entities
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  1. POHow to update tables from back end that it reflects in retrieved entities
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    copied!<p>I'm developing a Spring MVC web application using Windows 7, Eclipse Juno, Eclipselink JPA as ORM and Glassfish as application server with Oracle 11g. While I was working with Eclipselink I noticed when I update a table manually by execute an update PL/SQL query it doesn't has any affect on entities that already retrieved by Eclipselink until restart the server. Although, I disabled Eclipselink cache by having <code>&lt;shared-cache-mode&gt;NONE&lt;/shared-cache-mode&gt;</code> in persistance.xml and using <code>EntityManager.clear()</code>, <code>EntityManager.close()</code> and <code>@Cacheable(false)</code>.</p> <p>Then, I noticed when I update tables using Oracle-SQLDeveloper table designer it totally works fine and entities are showing updated information. So I checked SQLDeveloper log to see what query it's using to update rows and I saw that it's using ORA_ROWSCN and ROW ROWID in where clause. After that, I exactly used the same where clause as the one SQLDeveloper used to update tables, but still entities were showing old information.</p> <p>I'm wondering what factors are involved here that Eclipslink is not fetching real time data from database ? but, after updating table with SQLDeveloper designer Eclipselink is showing real time data. It seems that modifying a table data with SQLDeveloper table designer also marks the table as changed by using some database features. Then, Eclipselink will read the mark before hitting the table.</p> <p>Also to get more clarification, anyone knows what steps are involved in Eclipselink before it decides to hit database when user commands to execute a TypedQuery ? I'm so curious that where it stores cached entities ? since cache rest just by restarting the computer; I tried restarting Glassfish, killing the java process and logoff current user, but none of them worked. Why Eclipselink still is caching entities since I configured it to not use any caching procedure? Is it possible to completely turn off cache in Eclipselink?</p>
 

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