Contents
Which is the first phase of the ORM architecture?
Here follow the ORM architecture. The above architecture explains how object data is stored into relational database in three phases. The first phase, named as the Object data phase contains POJO classes, service interfaces and classes. It is the main business component layer, which has business logic operations and attributes.
What is an overview of the Scrapy architecture?
The following diagram shows an overview of the Scrapy architecture with its components and an outline of the data flow that takes place inside the system (shown by the red arrows). A brief description of the components is included below with links for more detailed information about them.
What are the main features of Orm components?
The main feature of ORM is mapping or binding an object to its data in the database. While mapping we have to consider the data, type of data and its relations with its self-entity or entity in any other table. Idiomatic persistence : It enables you to write the persistence classes using object oriented classes.
What is the role of the scheduler in Scrapy?
The Scheduler receives requests from the engine and enqueues them for feeding them later (also to the engine) when the engine requests them. The Downloader is responsible for fetching web pages and feeding them to the engine which, in turn, feeds them to the spiders.
What do you need to know about component based architecture?
Component-based architecture focuses on the decomposition of the design into individual functional or logical components that represent well-defined communication interfaces containing methods, events, and properties. It provides a higher level of abstraction and divides the problem into sub-problems, each associated with component partitions.
Which is an example of an orm.xml file?
For example Eclipselink, Toplink, Hibernate, etc. Mapping file : The mapping file (ORM.xml) contains mapping configuration between the data in a POJO class and data in a relational database. JPA Loader : The JPA loader works like cache memory, which can load the relational grid data.