persistence

问题 As stated in the documentation on sqlite_popen php tries to make use of a persistent resource mechanism. Where is this mechanism described in detail? Is it possible to view all resources currently stored/used? Is it possible to access this mechanism and store/read other values? 回答1: sqlite_popen uses the (executor) global hashtable "persistent_list" to store the connection resource. This hashtable is not part of the php "instance" which executes your script but of the php "runtime", which

问题 If users view documents on my website (for example a pdf file that represents some confidential information), is there anyway I can prevent them from saving the document locally? 回答1: Once the user has downloaded your PDF (to the browser) they can do anything with it. They can save it to elsewhere in their hard drive. Even if you somehow disabled this anyone could intercept the network traffic using a third-party application and save the PDF that way. Your best bet is some kind of Digital

问题 I'm researching the development of Enterprise Applications in Java, .NET and Groovy. For each platform, we're going to try how hard it is to realize a simple SOAP web service. We'll use the tools and libraries that are most commonly used, to research the real world as accurately as possible. In this regard, when using Hibernate for persistence, would it better reflect the real world to use the new JPA (Java Persistence API), or the Hibernate custom API that existed before JPA came around? 回答1

问题 Are there any Java code generation persistence frameworks? Something that is "database first" rather than object model first? I know this is probably heresy in the Java world, I'd just like to know if any frameworks like this exist. I'm more of a .NET guy these days. So on the .NET-side tools like .NET Tiers or CSLA come to mind. 回答1: sure, hibernate and netbeans for example can reverse engineering a database. You may be want to look at: Hibernate Tools; site in maintenance netbeans, with

问题 Fellow StackOverflowers, is there a way for me to remove a queue or a topic in ActiveMQ programmatically? I am using ActiveMQ's standard persistency, and my application requires that, on startup, all new queues be dynamically re-created (unless there are messages stored in the queue, in which case, the queue should remain to exist). I am also creating all queues programmatically through sessions. Is there an equivalent to that procedure, only to delete a queue? Querying and iterating through

问题 I was under the impression that session.load() loads the proxy object in the cache while session.get() always hits the database but I am confused after watching a JavaBrains video. According to this video when we are calling the below get method it is loading the proxy object of UserDetails in the memory. user = (UserDetails) session.get(UserDetails.class, 1); Structure of UserDetails is While in the comment section, a guy commented: there is no proxy of User class, instead the proxy object

问题 I was under the impression that session.load() loads the proxy object in the cache while session.get() always hits the database but I am confused after watching a JavaBrains video. According to this video when we are calling the below get method it is loading the proxy object of UserDetails in the memory. user = (UserDetails) session.get(UserDetails.class, 1); Structure of UserDetails is While in the comment section, a guy commented: there is no proxy of User class, instead the proxy object

问题 Let's say I have a text file created using Data::Dumper, along the lines of: my $x = [ { foo => 'bar', asdf => undef }, 0, -4, [ [] ] ]; I'd like to read that file back in and get $x back. I tried this: my $vars; { undef $/; $vars = <FILE>; } eval $vars; But it didn't seem to work -- $x not only isn't defined, when I try to use it I get a warning that Global symbol $x requires explicit package name. What's the right way to do this? (And yes, I know it's ugly. It's a quick utility script, not

问题 We are in the process of selecting the best method for saving state between WCF sessions/calls. We have found that WCF DurableService suits our needs. We would like to know is this ok for heavy usage. We are expecting 1000+ sessions and each session will be persisting about 100KB of data (xml serialized format), with complex object (only 1 object) to be persisted. Given our requirements, is WCF DurableServices the right solution? 回答1: DurableService uses built-in WCF features to communicate

问题 As stated in the title, I am using the Firebase Realtime Database, with persistence enabled . As stated in the guide, By enabling persistence, any data that the Firebase Realtime Database client would sync while online persists to disk and is available offline, even when the user or operating system restarts the app. This means your app works as it would online by using the local data stored in the cache. Listener callbacks will continue to fire for local updates . While this happens with the