lazy-loading | 易学教程

@Basic(fetch = FetchType.LAZY) does not work?

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问题 I use JPA (Hibernate) with Spring. When i want to lazy load a Stirng property i use this syntax: @Lob @Basic(fetch = FetchType.LAZY) public String getHtmlSummary() { return htmlSummary; } But when i look at the sql that hibernate creates, it seems this property is not lazy loaded? I also use this class org.hibernate.tool.instrument.javassist.InstrumentTask in ANT script to instrument this property but it seems it does not work. Please help me. Khosro. 回答1: Lazy Lob loading would require

Spring OpenSessionInViewInterceptor doesn't work

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I had the (in)famous problem with hibernate and lazy loading when views are rendered.... As many say, the only two solutions are: Make the method transactional (and this is not always desiderable) Use OpenSessionInViewInterceptor. The latter is preferable IMO. Anyway I'm not sure if this interceptor is firing at all (in fact I get the same Lazy loading exception and nothing changes): org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: it.jsoftware.jacciseweb.beans.Listino.prodotti, no session or session was closed I'm using simple annotation based url

How yield implements the pattern of lazy loading?

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问题 How yield implements the pattern of lazy loading ? 回答1: yield implementation doesn't reach the code until it's needed. For example, this code: public IEnumerable<int> GetInts() { yield return 1; yield return 2; yield return 3; } Will actually compile into a nested class which implements IEnumerable<int> and the body of GetInts() will return an instance of that class. Using reflector you can see: public IEnumerable<int> GetInts() { <GetInts>d__6d d__d = new <GetInts>d__6d(-2); d__d.<>4__this =

Using AsyncTask to load images into a custom adapter

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Although there are many tutorials out there, I've found it really difficult to implement an AsyncTask to load images from URI's (obtained from a content provider) into a custom adapter. I get the basic gist, which is to have a class containing an AsyncTask, do the bitmap creation in the 'doInBackground', and then set the ImageView in the onPostExecute. The problem for me, being new to android & programming, is that I don't know how to pass in my Uri's to the AsyncTask for each item, how to create the bitmap, and how to return it to the adapter. I've only gotten this far with the actual

Lazy load Angular 5 error: $$_lazy_route_resource lazy recursive

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问题 I'm using angular cli AoT compilation. When I try to make a lazy load component following this tutorial , I got the error below: ERROR Error: Uncaught (in promise): TypeError: __webpack_require__.e is not a function TypeError: __webpack_require__.e is not a function at webpackAsyncContext (eval at ./src/$$_lazy_route_resource lazy recursive (main.bundle.js:13), <anonymous>:15:29) at SystemJsNgModuleLoader.loadAndCompile (core.js:6554) at SystemJsNgModuleLoader.load (core.js:6538) at

Paging over a lazy-loaded collection with NHibernate

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I read this article where Ayende states NHibernate can (compared to EF 4): Collection with lazy=”extra” – Lazy extra means that NHibernate adapts to the operations that you might run on top of your collections. That means that blog.Posts.Count will not force a load of the entire collection, but rather would create a “select count(*) from Posts where BlogId = 1” statement, and that blog.Posts.Contains() will likewise result in a single query rather than paying the price of loading the entire collection to memory. Collection filters and paged collections - this allows you to define additional

Using Glide for Android, how do I load images from asset and resources?

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问题 I want to keep all the transformation, stoke and animations identical and was thinking if we can pass resource ID or asset name in Glide to load it locally? 回答1: For resource ids, you can use: Glide.with(fragment) .load(R.drawable.resource_id) .into(imageView); For assets, you can construct an asset uri: Glide.with(fragment) .load(Uri.parse("file:///android_asset/<assetName>")) .into(imageView); 回答2: Glide.with(context).load(uri).asBitmap().placeholder(R.drawable.yourimage).error(R.drawable

Hibernate XML Mapping: Lazy False or Fetch Select?

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I have a simple question. I found this Hibernate config on our project: <many-to-one name="employee" class="com.myapp.Employee" cascade="merge" lazy="false" fetch="select"> <column name="employee_id" sql-type="bigint" not-null="true"/> </many-to-one> Doesn't fetch="select" mean "Lazy load all the collections and entities" based on Fetching Strategies . But by writing lazy="false" mean do not lazy load. So the config above says: "Disable lazy loading. Enable lazy loading." In effect, this means the property is lazy loaded? So I could shorten that config as: <many-to-one name="employee" class=

Creating lazily initialized Spring beans using annotation based configuration

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问题 I am using Spring's @Component annotation to configure many of the beans in my Spring 3.0 application. I would like to know if it's possible to construct some of these beans lazily - especially the prototype beans? 回答1: To declare lazy-initialized bean you can use @Lazy annotation. Note, however, that it doesn't make sense for prototype beans - they can't be eagerly initialized, so there is no need to mark them lazy. 回答2: Lazy initialization isn't an option in the context of prototype-scoped

How to Achieve Lazy Binding of Tab Page Controls in WPF?

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I have an entity class. This entity has lots of properties and entity's data is shown to the user in several TabItems of a TabControl . I also implement MVVM approach. When the screen is shown to the user first, I want to bind only the active tab page controls and as the user navigates through tab pages additional separate bindings will be incurred as-needed. How can I achieve that? You don't have anything to do, that's the default behavior. The DataTemplate for a TabItem content won't be instantiated until this TabItem is selected EDIT: here's an example: <Window.Resources> <DataTemplate