What Is a Cascading Menu?

Cascade refers to the mapping relationship between multiple objects in computer science. Establish a cascade relationship between data to improve management efficiency.

Repetitive operations are cumbersome, especially when dealing with multiple objects that are related to each other. At this time, we can use Cascade operations. Cascade is an important concept in association mapping, which refers to whether the associated object (passive) performs the same operation synchronously when the active object performs the operation.

Cascading is also used to design one-to-many relationships. For example, a table stores teacher information: table A (name, gender, age), with name as the primary key. There is also a table for class information taught by the teacher: Table B (name, class). They are cascaded by name. Cascading operations include cascading updates and cascading deletes. After enabling a cascading update option, you can change a primary key value if a matching foreign key value exists. The system updates all matching foreign key values accordingly. If the record named Zhang San is changed to Li Si in Table A, all records named Zhang San in Table B will be changed to Li Si. Cascading deletes is similar to updates. If the record named Zhang San is deleted in Table A, all records named Zhang San in Table B will also be deleted.

Cascading is the effect of connecting more than two devices in a certain way.

Cascading can be applied in many ways. For example: on the network

In LAN connection, the DCE / DTE concept in WAN connection is usually introduced. In short, DCE (Data Communication Equipment) refers to

Forms can display data related to them in a hierarchical view, such as data in related databases. The following is an example of displaying data in a database using a hierarchical view that references a database in the instruction manual. Users can expand or collapse the hierarchy of the organization by clicking on the expand and collapse charts (plus and minus signs). Spread software ^[1]

With the increase in the number of computers and the expansion of the network scale, in more and more LAN environments, switches have replaced hubs, and multiple switches have interconnected to replace a single switch.

In a multi-switch LAN environment, cascading, stacking, and clustering of switches are three important technologies. Cascading technology can realize the interconnection between multiple switches; stacking technology can combine multiple switches into a unit, thereby improving greater port density and higher performance; clustering technology can use multiple switches connected to each other as one Logical devices are managed, which greatly reduces network management costs and simplifies management operations. ^[2]