persistence | 易学教程

How to read/write a matrix from a persistent XML/YAML file in OpenCV 3 with python?

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问题 I've been trying to read and write matrices to persistent file storage (eg. XML) with anaconda's current cv2 (which I believe is actually OpenCV 3.x). I looked at the solutions online for this, and people reference something done like this: object = cv2.cv.Load(file) object = cv2.cv.Save(file) source. This does not work on the current anaconda python cv2 . People propose solutions like this yaml example, but I'm confused why so much boiler plate code is needed for this simple functionality, I

Why do we need to specify class inside <persistence-unit> element?

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问题 My persistence.xml has 2 persistence-units. Each of them has several <class> elements. I thought that we must specify all classes related to certain persistence-unit. But I accidentally forgot to specify class-element for new entity but the program worked fine even without it. Then I removed all class-elements and everything worked fine. So, why do we need it? sample code: <persistence-unit name="JiraManager" transaction-type="RESOURCE_LOCAL"> <class>chartdemo.model.domain.Category</class> <

How can I store objects in a session in PHP?

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问题 Hello I would like to store or save an object inside a session,using classes like SessionHandler or arrays $_SESSION,I've seen that it is possible if I serialize the object,and I don't want to lose the methods of that object instance.. I've seen seralizing it is possible but the objects what I want to store is created by PDOStatement::fetchObject() althought the instance class is "Users" I get this error: PDOException: You cannot serialize or unserialize PDO instances Why? It is not a PDO

Some CoreData relationships are lost after closing app

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问题 This is the overview of my problem: I am adding (and confirm they are added) about 1400 relationships loaded from a soap service into CoreDat. After I close the app and open it again some of the relationships are lost; I only see around 800 of them (although it varies). Also, I am not getting any errors. And now, more details: I have an object called User that has information about services a user have saved; it looks something like this: @interface OosUser : NSManagedObject + (OosUser *)

Atomic state storage in Python?

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问题 I'm working on a project on an unreliable system which I'm assuming can fail at any point. What I want to guarantee is that if I write_state and the machine fails mid-operation, a read_state will either read a valid state or no state at all. I've implemented something which I think will work below -- I'm interested in criticism of that or alternative solutions if anyone knows of one. My idea: import hashlib, cPickle, os def write_state(logname, state): state_string = cPickle.dumps(state,

persistence.js add() function not working

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I have tried to save an object to database: Item = persistence.define('Item', { imageUrl: "TEXT", }) this is working,the imageUrl is set correctly: var c = new Item({imageUrl: "a"}); this is not working, imageUrl is empty in the db var c = new Item(); c.imageUrl = "a"; this is working: var c = new Item(); c._data.imageUrl = "a"; Seems like a bug. Sebastian Viereck I think I found the reason, If you are using jquery then you have to use: e. g. obj.name(newValue) to set and obj.name() to get attributs. Can you please tell me where the documentation for such cases can be found? https://groups

java executorservice persist queue

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I implemented the Spring-TaskExecutor (which is the equivalent of the JDK 1.5's Executor.) to process notifications notifications receiving from external systems. Interface with only one method: public interface AsynchronousService { void executeAsynchronously(Runnable task); } and the corresponding implementation: public class AsynchronousServiceImpl implements AsynchronousService { private Executor taskExecutor; @Override public void executeAsynchronously(Runnable task) { taskExecutor.execute(task); } @Required public void setTaskExecutor(Executor taskExecutor) { this.taskExecutor =

Android issues reading images from persistent Uri

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问题 My app lets the user select images and then it animates the images. It's a simple thing and I want it to run on 4.2 and onwards. It works perfectly now. The app is supposed to remember the chosen images and let these be default the next time the user runs the app - when the app is restarted. This works beautifully on my Galaxy Nexus (4.2.1) but not so well on my Galaxy S8+ (7.0). Since I love how it works on 4.2.1, it's a bit frustrating that it can't simply run the same on later platforms.

How to manage newly created objects without “saving” before transitioning to a new route it in emberjs?

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问题 I have an issue where I have a resource with a new route. When I transition to that new route I create a new object. On the form I have button to cancel, which removes that object. However, if I click a link on my navigation, say going back to the resource index, that object is there with whatever I put in the form. What's the best way of managing creating objects then moving away from the form? My routes: App.Router.map(function() { this.resource('recipes', function() { this.route('new');

Cant inject Bean class into Restfull WebService (JAX-RS) [duplicate]

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This question already has answers here : Inject an EJB into JAX-RS (RESTful service) (7 answers) Closed 3 years ago . I'm trying to save data acquired by Rest web service to database using hibernate/persistence. In one of my web modules i implemented that service. Database ejb connector is placed in EJB module. They are parts of EAR application. Every time when i call pb.addDevice() im getting java.lang.NullPointerException when puting proper url with params in browser(worked till i wanted to save it to Database). Can't find what is wrong with it. I'm using jboss 6.1.0 Final. tried answer of