UJO ORM framework technical principles in the Java class library (Application Analysis of Ujo Orework Technical Principles in Java Class Libraries)

UJO ORM framework technical principle in the application analysis in the Java class library Brief introduction ORM (object relationship mapping) is a technology that linked the object model to the relationship database model. It can automate the mapping relationship between the Java class and the database, and simplify the database access and operation.UJO ORM is an ORM framework based on the Java language. By packaging database operation details and providing simple APIs, developers can easier database operations.This article will explore its application in the Java class library by analyzing the technical principle of UJO ORM framework. The core principle of the UJO ORM framework 1. Database connection management The UJO ORM framework provides a simplified database connection management method by encapsulating the JDBC (Java database connection) API.It supports the connection pool technology, separating the creation and management of the database connection with the application, effectively improving the efficiency and performance of the database operation. 2. Object-relationship mapping The UJO ORM framework maps the Java class and the database table by annotating and configuration files.Developers only need to add an annotation or configuration file to the Java class to complete the mapping of the object and the relationship database.The framework will automatically generate SQL statements according to the mapping relationship to achieve the persistence of the object and the automation of the database operation. 3. Database operation API The UJO ORM framework provides a wealth of APIs, enabling developers to easily perform database operations.It supports common addition, deletion, and inspection operations, as well as complex advanced query functions.The framework provides the support of a strong query language and the support of the CRITERION query conditions, so that developers can more flexibly write database query sentences. The application of UJO ORM framework in the Java library 1. Simplify the database operation Using the UJO ORM framework, developers do not need to write tedious SQL statements, and only need to perform database operations through simple APIs.The framework will automatically generate the corresponding SQL statement according to the mapping relationship of the object and the database table to achieve the persistence of the object and the automation of the database operation.This greatly simplifies the process of database operations and improves development efficiency and readability. The following is an example of insert operation using the UJO ORM framework: // Create UJO objects Entity person = new Entity(Person.class); person.set("name", "Alice"); person.set("age", 25); person.set("gender", "female"); // Insert data person.insert(); 2. Support transaction processing The UJO ORM framework provides support for transaction management. Developers can use transaction annotations to manage the atomicity and consistency of multiple database operations.The framework will automatically handle the transaction and roll back to ensure the consistency and reliability of the database operation. The following is an example of using the UJO ORM framework for transaction processing: @Transaction public void transferMoney(int fromAccount, int toAccount, double amount) { // Deduct the amount of the transfer account Account from = new Account(fromAccount); from.setBalance(from.getBalance() - amount); from.update(); // Increase the amount of transfer to the account Account to = new Account(toAccount); to.setBalance(to.getBalance() + amount); to.update(); } 3. Support the cache mechanism The UJO ORM framework supports the cache of the object, which can improve the performance of database operations through the cache mechanism.When the framework is conducting the query operation, the data will be found first from the object cache. If the object exists in the cache, the cache data is directly returned to avoid access to the database.This is very effective for frequent reading data, which can significantly improve database query performance. The following is an example of cache operation using the UJO ORM framework: // Open the cache EntityCache.enable(Person.class); // Query data Entity person = new Entity(Person.class); person.loadByID(1); in conclusion The UJO ORM framework is a powerful and easy -to -use ORM framework. It can make developers more easily perform database operations through packaging database operation details and providing simple APIs.This article analyzes the core principles of the UJO ORM framework and the application in the Java class library. It can be seen that it has an important role in simplifying database operations, support transaction processing and cache mechanisms.For developers, mastering the UJO ORM framework technical principle and flexible application can improve development efficiency and improve code quality.