Inquiry of "Genormous" framework technical principles in the Java class library

Inquiry of "Genormous" framework technical principles in the Java class library Genormous is a framework in a Java library that is used to handle large -scale data sets and complex relational databases.This article will explore the technical principles of the Genormous framework and provide the necessary Java code examples. 1. Overview of Genormous Framework Genormous is an efficient ORM (object relationship mapping) framework, which is used to map the Java object and the relational database table.It provides a simple way for data persistence, thereby simplifying the complexity of database operations.The design goal of the Genormous framework is to handle large -scale data sets and perform well in performance. Second, the core characteristics of genormous 1. Database model automatic mapping: Genormous framework can automatically create and maintain the database model according to the mapping annotation between the Java class and the database table.In this way, developers only need to pay attention to business logic and do not need to manually create a database table. The following is a sample code that shows how to use Genormous's physical annotation to define the database model: @Entity(name = "User") @Table(name = "users") public class User { @Id private int id; @Column(name = "username") private String username; @Column(name = "password") private String password; // omit the constructive method, Getter and Setter method, and other business logic } In the above examples,@Entity annotations identify that this is a database entity.@Table annotation specifies the mapping database table name,@ID annotation identifies the main key field,@column annotation specifies the mapping relationship between fields and columns. 2. Inquiry -based data access: The Genormous framework provides a powerful query language, which is convenient for developers to conduct flexible database inquiries.It supports an object -oriented method for query to avoid the complexity of using the SQL statement directly. The following is an example code that shows how to use Genormous for query -based data access: Query query = entityManager.createQuery("SELECT u FROM User u WHERE u.username = :username"); query.setParameter("username", "john_doe"); User user = query.getSingleResult(); In the above example, we used Genormous's query language to query a user named "John_doe". 3. Performance optimization: Genormous framework has optimized performance for large -scale data sets and complex queries.It uses cache and delay loading technologies to improve the efficiency and speed of data access. 3. Genormous's working principle Genormous uses Java reflection and dynamic proxy technology to achieve mapping between objects and database tables.It analyzes the structure of the Java class during runtime, and dynamically creates a proxy object based on the annotation information, so that the operation of the database is converted into the corresponding Java object operation. When developers use the Genormous framework to query data, it will dynamically generate SQL statements based on the query language and interact with the database through JDBC (Java Database Connectivity).In the process of data access, Genormous will use cache to improve query efficiency and use delay loading technology to reduce unnecessary database access. Fourth, summary Genormous is an efficient ORM framework that is used to handle large -scale data sets and complex relational databases.By automatically mapping database models and providing query -based data access methods, it simplifies the complexity of database operations.Using Java reflection and dynamic proxy technology, Genormous can achieve mapping between objects and database tables, and improves the efficiency of data access through performance optimization technology.