orphan

Why is implementing an external trait using my type as a parameter for an external type legal?

由 若如初见. 提交于 2021-02-09 11:15:15
问题 I am modifying some code to depend on rand version 0.5. At first, I was worried how I would enable generating random values of my own types with Standard , but I found out this is legal: impl ::rand::distributions::Distribution<MyType> for ::rand::distributions::Standard { // ... } Why is it legal? I thought implementing an external trait for an external type is illegal. 回答1: The entire purpose of these rules (called the orphan rules or coherence rules ) is to avoid having any conflicting

Orphans remain in database even with orphanRemoval=true on one-to-many relationship (JPA/Hibernate)

由 北城余情 提交于 2019-12-30 04:06:06
问题 @Entity @Inheritance(strategy = InheritanceType.SINGLE_TABLE) @Table(name = "company_policies") @DiscriminatorColumn(name = "rule_name") public abstract class AbstractPolicyRule implements Serializable { @Transient private static final long serialVersionUID = 1L; @Id @GeneratedValue private Long id; private String value; ... } _ @Entity public class Category implements Serializable { @Transient private static final long serialVersionUID = 1L; @Id @GeneratedValue private Long id; @Column(name

Git Merge commits into an orphan branch

由 …衆ロ難τιáo~ 提交于 2019-12-28 13:48:52
问题 I'm curious to know if you CAN and if there is anything wrong with merging commits INTO my orphan branch. For this specific instance my Salesforce repository has a master branch and a pre-release branch but because our sandbox environment often has metadata that is not part of production yet we want to version control it but separate enough from our clean pre-release branch. So as it is we have the following: (Production Init Commit) (official release) / / o-------------------------o [master]

C++, allocating space in a for loop, possible memory leak verification

由 微笑、不失礼 提交于 2019-12-21 05:23:29
问题 I was just curious as to if this code would create multiple memory leaks, or if it would get cleaned up correctly. Node *newNode; for (int i = 0; i < 10; i++) { newNode = new Node(); } delete newNode; So obviously the code doesn't do anything, but it does help me explain my scenario. Am I allocating memory 10 times and when I'm deleting the pointer leaving 9 orphans? Or am I reusing the same space being allocated and removing the orphan correctly? Thanks in advance! 回答1: Yeah this is leaking

JPA 2.0 / Hibernate and “orphanRemoval”: Just replacing an entity does not remove the old one

由 匆匆过客 提交于 2019-12-18 12:55:14
问题 I have question regarding JPA 2.0, Hibernate and "orphanRemoval". First my setup: Spring 3.0.5.RELEASE SprnigData JPA 1.0.1.RELEASE Hibernate 3.5.2-Final DBMS: PostgreSQL 9.0 I have two rather simple entity classes, "User" and "AvatarImage", A "User" has an "AvatarImage", and so between "User" and "AvatarImage" there is the relationship. In the class "User", the property looks like this: // class "User" @OneToOne(cascade = CascadeType.ALL, fetch=FetchType.LAZY, orphanRemoval = true) private

Python multiprocessing and independence of children processes

由 南楼画角 提交于 2019-12-18 04:07:29
问题 From the python terminal, I run some command like the following, to spawn a long-running child process: from multiprocessing.process import Process Process(target=LONG_RUNNING_FUNCTION).start() This command returns, and I can do other things in the python terminal, but anything printed by the child is still printed to my python terminal session. When I exit the terminal (either with exit or CTRL + D ), the exit command it hangs. If I hit CTRL + C during this hang, the child process is

Setting orphanRemoval to true while migrating children from their parent to another parent

由 江枫思渺然 提交于 2019-12-17 20:37:17
问题 Important Notice : If you are reading this post, then consider looking into this post too for in-depth discussions. It is a quite usual practice/situation/requirement where children of a parent may be migrated to another parent. What happens, if orphanRemoval is set to true on the inverse side of such relationships? Consider as an example, any simple one-to-many relationship as follows. Inverse side (Department) : @OneToMany(mappedBy = "department", fetch = FetchType.LAZY, cascade =

Problem with NHibernate not detecting other associations when all-delete-orphan is set on a M:N relationship

由 ☆樱花仙子☆ 提交于 2019-12-12 01:39:35
问题 Here's the scenario: I have 3 objects called Person, VideoGame, and Store. One Person can have many VideoGames One VideoGame can belong to many Persons Same M:N relationship is between Store and VideoGames In the DB, the only thing besides these entities are two simple join tables PersonsVideoGames and StoresVideoGames. Assume everything has an Id property and they are unique. Business Rules: I do not want a video game to be in the VideoGames table if it is not associated with anything (an

Hibernate - One to many relationship and orphanRemoval cascade

由 五迷三道 提交于 2019-12-09 11:39:50
问题 I have a basic one to many relation parent / child like in the chapter 21 of Hibernate references book. The cascade is only from child to parent (persist cascade only because I don't want to delete the parent if I delete a child). When I add a child to the parent and I save the child, I have a TransientObjectException... @Entity public class Parent implements Serializable { @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @OneToMany(mappedBy = "parent", orphanRemoval =

C++, allocating space in a for loop, possible memory leak verification

由 我的未来我决定 提交于 2019-12-03 16:53:38
I was just curious as to if this code would create multiple memory leaks, or if it would get cleaned up correctly. Node *newNode; for (int i = 0; i < 10; i++) { newNode = new Node(); } delete newNode; So obviously the code doesn't do anything, but it does help me explain my scenario. Am I allocating memory 10 times and when I'm deleting the pointer leaving 9 orphans? Or am I reusing the same space being allocated and removing the orphan correctly? Thanks in advance! Yeah this is leaking memory. When you do: newNode = new Node(); You are redefining the pointer to point to newly-allocated memory
订阅 orphan