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
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
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
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
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
About Inverse=true and Cascade in Hibernate
Hibernate set mapping inverse and cascade detailed
1, in the end where to use Cascade= "...".
Cascade attribute is not a many-to-many relationship must be used, with it just let us insert or delete to the image of more convenient, as long as the source of
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
1. Where can I use cascade = "..."?
The cascade attribute is not required for many-to-many relationships. With this attribute, we only make it easier to insert or delete the object, as long as we insert or delete the object at the cascade source, all cascade relationships are automatically inserted or deleted. To ma
When there is a parent-child relationship between the two parties, you can set cascade to all-delete-orphan at set.
The so-called parent-child relationship refers to the persistence cycle of the child controlled by the parent. The child object must be associated with a parent object. If a parent object is deleted, all associated child objects should be deleted cascade; if a child object is no longer associa
Parent-Child tables are often involved when adding, modifying, and deleting records in a database.For example, a province table and a city table have a foreign key province_id referenced to the primary key of the province table. In this way, we can regard the province table as a parent table and the city table as a sub table. The existence of city table records depends on the records of the province table. (In the example mentioned in this article, all the code is included in the attachment, so
more than one end, then someone asked, many-to-many on both sides are more, inverse exactly where? In fact, hibernate establishes many-to-many relationships and separates them into two one-to-many relationships, connecting a connection table in the middle. So the general existence of a one-to-many relationship, it can also be said: A pair of many is the basic component of many.Cascade has five options: All, delete, None,save-update,delete-orphan; All: Associate operations in all cases. None: As
Inverse and cascade in Hibernate, both of which are used in one-to-many (One-to-many) or many-to-many (many-to-many) relationships.As a general rule,inverse represents whether the relationship is maintained by itself, and cascade represents whether to perform cascading operations. Next, give a column to explain the relationship in more detail.Suppose there are t_department (departmental tables) and T_employ
Rapid objectdetection using a Boosted Cascade of simple Features fast target detection using the easy feature cascade classifierNote: Some translations are not allowed in a red fontTranslation, Tony,[email protected]Summary:This paper introduces a vision application of machine learning in target detection, which can process images quickly and achieve a higher recognition rate. The success of this work is du
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
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
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
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
Learning hibernate when the concept of cascade relationship is always unclear, especially cascade, inverse silly confused. The following is an example to illustrate briefly.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 new projec
What is a foreign key?
A foreign key means that values in one table must also appear in another table.
The referenced table is called the parent table and the foreign key is called the child Tabl E. The foreign key in the child table would generally reference a primary key in the parent table.
A foreign key with a cascade delete means this if a record in the parent table is deleted, then the corresponding records In the "child table" with automatical
Switch Port cascade knowledge to improve the route, when the two ports are common ports, namely MDI-X) port and MDI-II port, should use a straight-through cable. When four vswitches are uplinked, the network span can reach 500 meters. This distance is enough for a small network in the same building!
Port cascade of twisted pair Switches
Cascade uses both common p
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