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In the above figure, the table to be operated is specified with the-t option, and the operation filter table is specified here. Like the previous view command, when the table is not specified with the-t option, the default is the operation filter table.2.3 Process Edge2. Product Class: Pizza as defined above is also an abstract class, and specific products are implemented by its subclasses.The code for creating the object is encapsulated and the specific factory class is instantiated, thus achieving the purpose of encapsulation and instantiation. Encapsulating the code that creates the object in one place can also achieve the purpose of reuse and is more convenient for later maintenance. This also means that when the customer instantiates the object, he will only rely on the interface and not on the specific implementation. Help us to better achieve interface programming rather than implementation, making the code more flexible to cope with future extensions.In addition, you need to place a plug-in object on the page for uploading: