hibernate/hibernate-orm
Hibernate Orm
Hibernate ORM est un mapper objet-relationnel (ORM) Java et une implémentation complète de l'API Jakarta Persistence. Il sert de couche d'abstraction de base de données SQL qui traduit les modèles d'objets Java en schémas de base de données relationnelle pour gérer la persistance et le cycle de vie des données.
Le framework se distingue par un framework d'isolation de données multi-tenant pour séparer les données des clients au sein d'une même instance de base de données. Il dispose également d'un générateur de schéma de base de données qui produit et met à jour automatiquement les structures relationnelles basées sur les mappings d'entités.
Le système couvre des domaines étendus comme la gestion des transactions, le contrôle de verrouillage de concurrence et le suivi des données temporelles pour l'audit. Il fournit des outils d'optimisation de récupération de données via des stratégies d'entity-graph et prend en charge des types de données avancés comme les données vectorielles et les caractères nationalisés.
Le projet inclut une suite complète d'utilitaires de test pour la couche de persistance, incluant le filtrage par dialecte de base de données et les tests de conformité aux spécifications.
Features
- Object-Relational Mapping - Translates Java object-oriented domain models into relational database tables to manage data persistence and retrieval.
- Persistence Unit Managers - Provides a system for defining entity collections and connectivity settings via persistence unit configurations.
- Persistence State Tracking - Compares object snapshots against loaded states to automatically generate minimal SQL update statements during flush.
- Database Abstraction Layers - Provides a unified API for interacting with multiple database engines and SQL dialects.
- Data Tenant Isolators - Separates data for different customers using schema mapping and credential management within a single database instance.
- Complex Querying Techniques - Provides expressive query languages to handle intricate data retrieval requirements including aggregations and joins.
- Database Transaction Management - Ensures data integrity and consistency by enforcing ACID properties through programmatic transaction boundary control.
- Write-Behind Change Tracking - Tracks modifications made to objects in memory and automatically persists those changes to the underlying database.
- Lazy Loading Patterns - Defers the retrieval of related data from the database until the object is explicitly accessed.
- First-Level Caching - Maintains a session-scoped map of entity identifiers to object instances to ensure referential integrity.
- Object-Relational Mappers - Implements a framework that translates Java object models into relational database schemas to manage data persistence.
- Dialect-Specific SQL Generation - Translates abstract query trees into vendor-specific SQL strings to support multiple database dialects.
- Multi-Backend SQL Abstractions - Provides a persistence layer that abstracts multiple SQL dialects to ensure database portability.
- Entity Mapping Metadata - Defines object-relational relationships using metadata derived from Java annotations or XML configurations.
- Persistence API Implementations - Provides a full implementation of the Jakarta Persistence API (JPA) for managing data between Java applications and databases.
- Multi-tenancy Isolation - Implements architectural strategies for ensuring secure data separation between customers in shared database instances.
- Automated Schema Evolution - Automatically generates and updates database tables and constraints based on application domain models.
- Data Fetching Optimizations - Implements techniques for optimizing how related entities are retrieved to minimize database round-trips.
- Data Revision Tracking - Maintains historical versions of entities using global revision numbers to enable auditing and data recovery.
- Physical Schema Exports - Provides utilities to generate physical tables, sequences, and constraints based on entity mappings.
- Schema Generators - Automatically generates physical database schemas from application-level entity mappings.
- Lifecycle Merge Operations - Manages object lifecycles through merge operations, entity refreshing, and cascading database operations.
- Persistence Performance Tunings - Offers a set of tools to tune data access patterns and caching strategies to improve retrieval speeds.
- Entity Graph Fetching - Provides strategies for defining sets of attributes to be retrieved in a single query to minimize database round-trips.
- Traffic Routing - Implements logic to distribute database requests between read and write replicas to improve scalability.
- DDL Script Generators - Analyzes entity metadata to produce DDL scripts that automatically align the database structure with the domain model.
- Database Schema Scripting - Generates SQL DDL scripts to automatically create or update the relational database structure based on model changes.
- Row-Level Security - Provides capabilities to restrict access to individual data records based on user identity or permissions.
- Database Concurrency Control - Implements locking scopes and timeout configurations to manage concurrent access to database records.
- Data Modification Auditing - Tracks modifications to data over time by handling temporal data and maintaining a history of changes.
- Data Layer Testing - Provides a comprehensive set of specialized annotations and utilities for verifying data persistence and retrieval logic.
- Specification Compliance Testing - Provides a tool to run standardized test suites to confirm a database adheres to industry specifications.
- Object Relational Mapping - Core object-relational mapping functionality for Java.
- Persistence Frameworks - Mature object-relational mapping framework for Java.
