cascade dk

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Cascade effect in Hibernate

Cascade effect in Hibernate Only the "relationship token" has the cascade attribute;One operation may trigger multiple association actions because of cascading cascade. The previous operation is called a "master operation", and the latter action is called "associated operation".The possible values for the Cascade

Hibernate "Inverse and cascade attributes" knowledge essentials

Inverse propertyInverse Property: Indicates whether control is transferred . True: Control has been transferred "the current party has no control" False: Control is not transferred "the current party has control" The inverse attribute is useful when maintaining an association relationship . This attribute can only be used on one side! The default value for the inverse property is Fasle, which means that the current party has control over theTake a look at some aspects of how in

Cascade operations of Hibernate

Save-update: cascade storage (if the sub-object is updated after load, it will also be updated). However, it will not be deleted in cascade mode.Delete: cascade deletion, but does not have level-level joint warranty and updateAll-delete-orphan: when the parent-child relationship is removed, sub-objects that do not belong to the parent object are automatically del

Specific explanations for cascade and inverse in hibernate

Learning hibernate when the concept of cascade relationship is always unclear, especially cascade, inverse silly confused. The following is a simple example of how to use the sample.Preparatory work:Start by creating a database with two new tables:Classroom Table classes (field here Province)Student Table student (field here Province)The classroom is a one-to-many relationship with students. then create a n

Differences between stacking and cascade in Ethernet Switches

Cascade is connected to other hubs through a port of the hub. For example, a UPLINK port of the hub is used to connect to another normal port, and a stack is connected through the backplane of the hub, it is a chip-level connection. For example, the stacking of two 24-port switches is like a 48-port switch. The advantage is that there is no bottleneck. Stack and Uplink are two ways to connect multiple switches or hubs. Their main purpose is to increas

OPEN CASCADE multiple Variable Function

OPEN CASCADE multiple Variable Function[Email protected]Abstract. Multiple variable function with gradient and Hessian matrix are very very import in OPEN CASCADE optimization algorithms. In order to understand these optimization algorithm better, let's study some basic knowledge about Gradient, Hessian Matri X.Key Words. Multiple Variable Function, Gradient, Hessian Matrix, optimization algorithm,1. Introd

Hibernate configuration file Details cascade inverse

Writing today, when configuring a relationship, the cascade is then configured, with a value of false. Foggy, the result is very sad urge, has started on the error, made me, and then carefully check found that the original is cascade in doing that. Now summarize. By the way, review the inverse.1.cascade Cascade, with i

Cascade and inverse in the hibernate

Both of these properties are used in a many-to-many or many-to-many relationship. and inverse is especially used for two-way relationships that we don't need in a one-way relationship. Cascade represents whether a cascade operation is performed, and the inverse represents whether the relationship is maintained by the self. Cascade: The possible values for the

Inverse and Cascade property configuration in Hibernate

Inverse and Cascade are the two most difficult attributes to master in Hibernate mappings. Both play a role in the object's associated operations. 1. Clarify the role of inverse and cascadeInverse determines whether changes to the collection in the object are reflected in the database, so inverse only works on the collection, which is only valid for One-to-many or Many-to-many (because only the two associations contain collections. One-to-one and Many

Detailed analysis of vswitch cascade and stack cluster technologies

Analyzes the detailed technology of switch cascade and stack clusters. In a LAN environment with multiple switches, switch cascade, stack, and cluster are three important technologies, which are of great interest to everyone, I believe that you will also become an expert. The simplest LAN) is usually composed of a hub or switch) and several computers. As the number of computers increases and the network sca

Cascadeview Cascade Component Implementation ideas (separation ideas and single linked list) _javascript skills

This article introduces oneself to do the similar cascade function of the provincial and municipal cascade to realize the idea, in order to do as much as possible segregation of duties and performance and behavior separation, this function split into 2 components and the single linked list to achieve the key cascading logic, the next section has a demonstration of the GIF image. Although this is a very comm

Hibernate Cascade & Inverse

Cascade-Modifying the Entity tableInverse-Modifying the intermediate tableHttp://www.cnblogs.com/amboyna/archive/2008/02/18/1072260.html1, exactly where to use cascade= "..."?Cascade property is not a many-to-many relationship must be used, with it just let us in the insertion or deletion of the image is more convenient, as long as the

A detailed explanation of tiering and cascade differences in network switches

Cascade Extension The Cascade extension mode is the most conventional and direct extension, and some of the older networks use hubs as cascaded devices. Because the hubs were already quite expensive, most enterprises could not choose a switch as a cascade device. That's because most team users are connected to a hub from a port level on the hub. In this way, the

Hibernate mapping Inverse and cascade detailed

1, exactly where to use cascade= "..."?Cascade property is not a many-to-many relationship must be used, with it just let us in the insertion or deletion of the image is more convenient, as long as the cascade at the source of the insertion or deletion, all cascade relationship will be inserted or deleted by themselves

"Hibernate learning"-Cascade operations

Cascade Policy: Responsible for controlling the association between the object to the object cascade, including update, delete, and so on, the other objects are also affected, such as I delete an object, then it is a many-to-one relationship of the object is also deleted.After using the crawl strategy, after interviewing a sub-operation of the note: Cascadetype.merge Way@OneToOne (

Cascade Introduction and Usage (Oracle)

Cascade Delete, such as when you delete a table and then add the keyword, will delete the table and delete the relationship between the tableotherObject1. Cascade delete the information in table A, when the field in table A refers to the field in table B, once the information in the field in B is deleted, the information of table A is also automatically deleted. (When the parent table information is deleted

How to implement cascade in row editing of the datagrid ?, Datagrid implementation

How to implement cascade in row editing of the datagrid ?, Datagrid implementation It is still a cascade problem, but this time, it is in the datagrid, so the difficulty is definitely higher than the cascade in form. However, as long as you are familiar with the datagrid API, the problem can be easily solved. The key point is -- editor, which relies on the datagr

Hibernate:inverse, Cascade, one-to-many, many-to-many explanations

1, exactly where to use cascade= "..."?Cascade property is not a many-to-many relationship must be used, with it just let us in the insertion or deletion of the image is more convenient, as long as the source of cascade to insert or delete, all cascade relationship will be automatically inserted or deleted. To be able

Lightweight ORM Development Series: Object Relationships and cascade operations

The full name of ORM is object/Relation Mapping, that is, object relationship ing. Since ORM is developed, it is inevitable to involve the relationship between objects. Through the abstraction of object-oriented ideas, we can define the relationships between objects as follows: One-to-one Multiple-to-one (one-to-multiple) Many-to-many We can easily create an enumeration for object relationships. Code highlighting produced by Actipro CodeHighlighter (freewa

NewLife. XCode Getting Started Guide (4) cascade operations

1. Introduction In the previous section, we talked about extended attributes. To put it bluntly, we can click Teacher from the Subject and click the List of Subject from the Teacher. in practice, we usually Delete Teacher, so the course offered by this Teacher is useless, because Subjcet has no teachers. so we hope that the courses we delete when deleting the Teacher will also be deleted. therefore, cascade operations are available. Ii. Logical R

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