lazy-loading

问题 Hibernate optional @ManyToOne relationship still fetches the Parent in a separate select optional=true and fetch=FetchType.Lazy Child @ManyToOne //may not exist @JoinColumns({ @JoinColumn(name="parent_key1", insertable=false, updatable=false), @JoinColumn(name="parent_key2", insertable=false, updatable=false) }) Parent parent Note, that I can have a value for parent_key1 , parent_key2 columns existing in Child table but a corresponding Parent need not exist with this key, that's why the

问题 I am writing a program in which want to download images from online url and want to show in Staggered GridView format, i found Staggered GridView code from here and using this link to download images from online link in JSON format But the issue is, i am not able to download images into SD Card using below code..... MainActivity.java:- public class MainActivity extends Activity { private String urls[]; String location = "http://snapoodle.com/APIS/android/feed.php"; static final String TAG

问题 Here is my code snippet: public class Object1 implements Serializable { @Id @Column(length = 36) protected String id; @Column(length = 36, insertable = false, updatable = false) protected String parentID; @OneToMany(fetch = FetchType.LAZY) @JoinColumn(name = "object2ID", referencedColumnName = "parentID") protected List<Object2> parents = new ArrayList<>(); public List<Object2> getParents() { return parents; } } public class Object2 implements Serializable { @Id @Column(length = 36) protected

问题 I have a web application that will get domain objects from a web service, which in turn gets them from a database via NHibernate. I'd like to be able to transfer these objects with uninstantiated members (members that are typically lazy-loaded from the database in the web service) and then have subsequent calls automatically made to the web service when the application code tries to access them. Essentially a process identical to regular NH lazy loading, except with the web service in place

问题 This is extract of my mapping file: <class name="XXX.A" table="a" lazy="false"> <many-to-one name="B" lazy="proxy" access="field.camelcase" cascade="none" not-null="false" class="XXX.B" column="id_b"/> </class> But when A is loaded by its ID, I see "left join" to fetch B . How to prevent this? I may add that we use ISession.Get(...) and not ISession.Load(...) . 回答1: if you have <class name="XXX.B" lazy="false"> then NHibernate does not create a proxy class for it. Because of that all <many-to

问题 I am developing a iPhone photo app in which there is one view, where I am showing all the images taken through that app with the help of uiscrollview. First I simply loaded the scrollview with all the present images. But it made the app slow and also caused the crash giving the following warning: Received memory warning. Level=2 I googled a lot and found that the reason for so may be loading such heavy images all together on a view are resulting in memory warning and crash afterwards. So I

问题 I'm working in Rails 3.0.7. I have some many-to-many and some one-to-many associations that fail to eager load. My associations are: Person has_many :friends Person has_many :locations through=> :location_histories Location belongs_to :location_hour Location_hour has_many :locations In my controller I have the following: @people = Person.includes([[:locations=>:location_hour],:friends]).where("(location_histories.current = true) AND (people.name LIKE ? OR friends.first_name LIKE ? OR friends

问题 i have a site using jquery lazyload its working fine, but now i want to be able to disable this function. the reason is, that you can normally scroll through the images, which is fine, but i also do have a navigation, where you can jump to a certain image. now when lazyload is active, the browser jumps to the wrong place, i guess thats because lazyload also loads some previous images, so the intentional image gets displaced.. so i want to disable lazyload, if the subnavigation is active..

问题 I have a Doctrine 2 model which has a relation to a file system model (MogileFS) which I've implemented using a model/mapper approach. What I'm trying to accomplish is to lazy load the non-doctrine model from a Doctrine 2 entity, and inject a mapper object into this model while doing so. Example: use Doctrine\ORM\Tools\Pagination\Paginator; $dql = "SELECT p, c FROM BlogPost p JOIN p.comments c"; $query = $entityManager->createQuery($dql) ->setFirstResult(0) ->setMaxResults(100); $paginator =

问题 How can i reduce my vendor.bundle.js and main.bundle.js file size while build my application using ng build --aot false --prod if im using lazy loading module my angular application main.bundle.js file size is decreased while build. 回答1: ng build by itself does not have any optimizations. If you ng build --help you can see all the flags you can pass to further optimize your code and reduce the output sizes. Try ng build -prod -aot -vc -cc -dop --buildOptimizer and see what your numbers are.