Interpret the key points of the technical principle of Genormous framework in the Java class library

The Genormous framework is an important technology in the Java class library, which plays a role in simplifying the database access operation.This article will interpret the key points of the technical principle of Genormous framework and provide relevant Java code examples. 1. Overview of Genormous Framework Genormous is a Java -based lightweight ORM (object relationship mapping) framework. It allows developers to perform database access operations in an object -oriented method without directly writing SQL statements.This framework uses Java's reflection mechanism and dynamic proxy technology to realize the function of mapping database tables as objects and objects to databases. 2. Key points 1. Configuration file Genormous framework connects the database through a configuration file and sets up related parameters.Developers need to specify the connection information, drivers, user names, passwords, etc. of the database in the configuration file. 2. Entity class The Genormous framework needs to generate a corresponding physical class according to the database table structure, and each entity class corresponds to a table in the database.The attributes in the physical class correspond to the field of the table, and developers need to define the corresponding attributes and methods in the physical class. Example code: @Table("users") public class User { @Column("id") private int id; @Column("name") private String name; // Getters and setters... } 3. Note The Genormous framework uses annotations to simplify the code writing of the developer, making the mapping between the physical class and the database table more convenient.You need to use the database table corresponding to the physical class of the `@table` annotation marker, and use the database field corresponding to the attribute of the`@column`. 4. Database operation Genormous framework encapsulates common database operations, such as insertion, updating, deleting and querying.Developers only need to call the method provided by the framework to complete the database operation. Example code: User user = new User(); user.setName("Alice"); Genormous.insert (user); // Insert record user.setName("Bob"); Genormous.Update (User); // Update records Genormous.delete (user); // Delete records List <user> userList = Genormous.Select (user.class); // query record 5. Lazy load Genormous framework implements a lazy loading mechanism, which can delay loading associated objects.When developers use associated objects, the Genormous framework will automatically obtain relevant data from the database and fill it into the object. Example code: @Table("orders") public class Order { @Column("id") private int id; @Column("user_id") private int userId; // Getters and setters... public User getUser() { Return Genormous.lazyload (user.class, userid); // lazily load the associated User object } } Order order = Genormous.selectById(Order.class, 1); User user = Order.getUser (); // Load the associated User object from the database in the first access 6. Affairs management Genormous framework supports transaction management to ensure the atomicity and consistency of database operations.Developers can use the method to use the `@transcational` annotation mark in the code. Example code: @Transcational public void transferMoney(User fromUser, User toUser, double amount) { fromUser.setBalance(fromUser.getBalance() - amount); toUser.setBalance(toUser.getBalance() + amount); Genormous.update(fromUser); Genormous.update(toUser); } 3. Summary The Genormous framework is a Java class library that simplifies database access operations. Its core principle is based on reflection and dynamic proxy to implement the mapping of objects and database tables.Through configuration files and annotations, a concise database configuration can be associated with the physical class and the database table.Developers can use the Genormous framework to complete the database's addition, deletion, and inspection operation, and enjoy the convenience of lazy loading and transaction management functions. The above is the interpretation of the key points of Genormous framework technical principles. I hope to help readers understand and use the framework.