The key technical principles of the Genormous framework in the Java library analysis

Analysis of the key technical principles of Genormous framework in the Java library Summary: Genormous is a powerful and scalable universal ORM (object relationship mapping) framework in the Java class library.This article will analyze the key technical principles of the GENORMOUS framework and provide some Java code examples to illustrate the specific application of these principles. 1 Introduction In modern software development, the ORM framework plays a vital role in the conversion and mapping between objects and relational databases.The Genormous framework aims to reduce the workload of developers in ORM by providing a simple and easy -to -use way and supporting various relationship databases. 2. Code generation Genormous framework uses code generation technology to generate database tables and SQL query statements corresponding to the physical object.It generates code by reading the annotations and configuration files of the physical class.Below is an example physical class: @Entity @Table(name = "customer") public class Customer { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @Column(name = "name") private String name; // omit the getter and setter method } By analyzing the annotations of `@Entity`,`@table`, `@ID`,`@column`, and combined with the information of the configuration file, the Genormous framework can generate code for creating database tables and executing CRUD operations.In this way, developers do not need to write these duplicate code manually. 3. Database connection and connection pool Genormous framework is connected to the database by using Java's JDBC (Java DataBase Connectivity) technology.It provides a lightweight connection pool to manage database connections.Developers can configure database connection information in the configuration file, including database URL, user name, password, etc.The framework will be connected to the database of the database from these configurations. 4. persistent operation Genormous framework encapsulates common persistent operations, including insertion, update, delete and query.The following is an example of performing query using the Genormous framework: List<Customer> customers = genormous .createQuery("SELECT c FROM Customer c WHERE c.name = :name") .setParameter("name", "John Doe") .getResultList(); In the above examples, the method of `geenormous.createqury` is used to create a query object, and then the query parameters can be set through the` setparameter` method, and the query results are obtained through the `getResultList` method.The Genormous framework automatically generates the corresponding SQL statement according to the query statement and parameters and perform the query operation. 5. Support the multi -data library The Genormous framework is designed to consider support for a variety of relationship databases, such as MySQL, Oracle, Postgresql, etc.Developers only need to configure related information according to the specific database type. The Genormous framework will automatically generate the corresponding SQL statement according to different databases. 6. Database management Genormous framework supports the management of database affairs.Developers can mark the starting and ending points of the transaction by using the `@transactional` annotation.The framework will obtain the database connection at the beginning of the transaction and submit or roll back the transaction at the end of the transaction. @Transactional public void updateCustomer(Customer customer) { genormous.update(customer); } In the above examples, `@transactional` annotations are used to mark the transaction boundary for labeling` updatecustomer` methods.When the method is executed, the Genormous framework will automatically manage the start and end of the transaction. Summarize: The key technical principles of the Genormous framework in the Java library include code generation, database connection and connection pools, persistent operations, supporting multiple data libraries and database transaction management.By using these technical principles, the Genormous framework simplifies ORM's development process and improves development efficiency.Developers can configure and use the Genormous framework as needed, so as to focus more on the implementation of business logic.