Cascade

I am trying to use OpenCV's opencv_traincascade to generate a Haar Cascade. So far I have 87 distinctive positive samples and 39 negative samples for testing purposes. I generated the .vec file with opencv_createsamples, which worked fine. When I'm running opencv_traincascade it always gets stuck after a few stages, no matter how I change the parameters. My call looks like this: opencv_traincascade -data /opencvimgs/haarcascades/data/ -vec /opencvimgs/haarcascades/out.vec -bg /opencvimgs/haarcascades/neg.txt -numPos 87 -numNeg 39 I tried increasing and decreasing minHitRate and

I Have one entity [Project] that contains a collection of other entities [Questions]. I have mapped the relation with a cascade attribute of "all-delete-orphan". In my DB the relation is mapped with a project_id (FK) field on the questions table. this field cannot be null since I don't want a Question without a Project. When I do session.delete(project) it throws an exception saying that project_id cant be null, but if I remove the not-null constrain to that field, the deletion works nice. Anyone knows how to solve this? Straight from the documentation . This explains your problem exactly i

@Entity @Table(name = "Section_INST") public class Section { @javax.persistence.Id @GeneratedValue(strategy = GenerationType.SEQUENCE,generator = "Section_ID_GENERATOR") @SequenceGenerator(name = "Section_ID_GENERATOR",sequenceName = "Section_ID_SEQUENCER" , initialValue = 1 , allocationSize = 1) @Column(name = "Section_ID") private int Id; @Column(name = "Section_Name") private String name; @OneToOne(optional = false,cascade = CascadeType.PERSIST) @JoinColumn(name = "Exch_ID") private Exchange exchange; //---Constructor and Getter Setters----- } @Entity @Table(name = "EXCHANGE_INST") public

I'm quite new to Hibernate and have been trying to determine what it will do for you and what it requires you to do. A big one is dealing with an object that has dependants that don't yet exist in the database. For example, I have a Project object that includes a Manufacturer field that accepts a Manufacturer object as its value. In the database I have a products table with a mfr_id column that's a reference to the manufacturers table (a fairly typical unidirectional one-to-many relationship). If the manufacturer assigned to the product object relates to one that's already in the database then

I have two tables like here: DROP TABLE IF EXISTS schemas.book; DROP TABLE IF EXISTS schemas.category; DROP SCHEMA IF EXISTS schemas; CREATE SCHEMA schemas; CREATE TABLE schemas.category ( id BIGSERIAL PRIMARY KEY, name VARCHAR NOT NULL, UNIQUE(name) ); CREATE TABLE schemas.book ( id BIGSERIAL PRIMARY KEY, published DATE NOT NULL, category_id BIGINT NOT NULL REFERENCES schemas.category ON DELETE CASCADE ON UPDATE CASCADE, author VARCHAR NOT NULL, name VARCHAR NOT NULL, UNIQUE(published, author, name), FOREIGN KEY(category_id) REFERENCES schemas.category (id) ); So the logic is simple, after

I'm currenetly trying hard to delete an entity, that is involved in various relations (Only @ManyToOne ) - However, Hibernate does not delete anything - after calling em.remove everything remains unchanged. I have 5 entities ( E1 - E5 ), referencing the entity ( E6 ) in question like this: @Entity public class EX { @OneToMany(mappedBy = "eX", fetch = FetchType.EAGER, cascade = { CascadeType.PERSIST, CascadeType.REMOVE }) private Set<E6> e6s; } E6 itself has the reverse @ManyToOne Relations: public class E6{ @ManyToOne(optional = false) private E1 e1; @ManyToOne(optional = false) private E2 e2;

I'm developing a BlackBerry 10 mobile application using the Momentics IDE (native SDK). I have a listview which I want to handle its items click with C++ (I need to use C++ not QML). I can get the index path using the "connect" instruction, but I have problem with parsing a QVariant to a custom class ; Q_ASSERT(QObject::connect(list1, SIGNAL(triggered(QVariantList)), this, SLOT(openSheet(QVariantList)))); QVariant selectItem = m_categoriesListDataModel->data(indexPath); I tried to use the static cast like below Category* custType = static_cast<Category*>(selectItem); but it returns : "invalid

I have table "A" in MySQL. It has some references with cascade deleting to some other tables ("B", "C", "D" ...). I need to use a trigger when something deletes from "A". This trigger works when I delete records from "A" directly. But it doesn't work with cascade deleting. Does any version of MySQL exist where my trigger will work with cascade deleting? Or, maybe, there is another way to call Niel de Wet From http://dev.mysql.com/doc/refman/5.6/en/innodb-restrictions.html Cascaded foreign key actions do not activate triggers In other words, you cannot use the trigger with cascaded deleting.

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最近在做项目中， hibernate 物理删除 delete 方法的时候， 爆了诡异的错误， 比如 org.springframework.dao.DataIntegrityViolationException: Could not execute JDBC batch update; SQL [update gwqmshop_goods_package_detail set goods_package_id=null where goods_package_id=?]; constraint [null]; nested exception is 总之就是 删除的时候，爆了 其他表的 update 错误。 一时之间懵逼了。 请教同事 说可能是 hibernate的级联 或者关联 其他表的错误。 随时可以使用逻辑删除规避这个错误， 但是 老是感觉有点不服，难度真的是 hibernate的BUG ？ 或者为什么？ 比如 删除表 ShopCartPackage ， 对象里面 关联了 GoodsPackageDetail 以下是关联的地方。 /** * 商品明细 */ @OneToMany(fetch = FetchType.LAZY, cascade = {}) @JoinColumn(name="goods_package_id", referencedColumnName=