objectbox/objectbox-java

Features

• Embedded Database Engines - Functions as a native-process embedded database engine that runs directly within the application to eliminate network latency.
• Object-Oriented Databases - Provides an embedded object-oriented database that stores Java and Kotlin classes directly without relational mapping.
• Object-Relational Mapping - Stores Java or Kotlin classes as database entities, eliminating the need for relational mapping tables.
• Collection Querying - Retrieves objects from the database using equality or range filters and applies specific sort orders.
• Mobile Storage Engines - Provides a high-performance embedded storage engine optimized for mobile and JVM environments.
• Atomic Transactions - Wraps multiple data operations into single atomic units to ensure ACID consistency.
• Embedded Local Storage - Saves application objects directly to a local database on Android or JVM for fast offline access.
• NoSQL Databases - Implements a non-relational object store for persisting plain Java classes as entities.
• Object Storage Database Engines - Acts as an object storage engine that runs in-process for high-performance local data persistence.
• Object Property Filtering - Retrieves specific result sets by applying property conditions and logical operators to stored objects.
• Filtered and Ordered Queries - Sorts returned objects based on specific properties with configurable direction and null handling.
• ACID-Compliant - Provides ACID-compliant atomic transactions to ensure data consistency and prevent partial updates during storage operations.
• Entity Property Queries - Retrieves and manages stored entities using a dedicated interface tailored to specific object types.
• HNSW Indexes - Implements HNSW indexes to enable high-performance approximate nearest neighbor searches for vector embeddings.
• On-Device Vector Databases - Provides a local vector database utilizing HNSW indexes for on-device approximate nearest neighbor searches.
• Vector Search - Performs approximate nearest neighbor searches and semantic similarity queries using HNSW indexes on-device.
• Semantic Vector Search - Enables retrieval of objects based on the mathematical distance between query and document embeddings.
• Binary Serialization Formats - Utilizes a compact binary serialization format to efficiently persist primitives and complex collections on-device.
• Cross-Client Data Synchronization - Synchronizes objects between on-device storage and other platforms to maintain data consistency.
• In-Memory Data Stores - Supports an in-memory storage mode for high-speed data access during caching or automated testing.
• Data Change Observers - Offers reactive data observation to notify applications of database changes in real time.
• Asynchronous Transaction APIs - Executes database transactions on separate threads to avoid blocking the main application execution.
• Entity Modeling - Supports structured data modeling in Kotlin using standard classes and sealed subclasses for inheritance.
• Automatic Persistence - Automatically maps application classes to database entities to handle the persistence of new objects.
• In-Memory Databases - Supports initializing the data store in RAM for high-speed caching and automated testing.
• Lazy-Loaded Object Relations - Provides lazy-loaded one-to-one relations using proxies to optimize initial query time and memory.
• Object Relation Lazy Loading - Implements proxy-based lazy loading to minimize memory usage by retrieving related objects only upon first access.
• Object Identifier Management - Manages unique integer identifiers for objects to facilitate precise referencing and retrieval of data.
• Embedded Collection Persistence - Persists lists and arrays of fixed-type values and binary blobs directly within a data object.
• Object-Relational Mapping Associations - Links objects via integer references to establish one-to-one and one-to-many associations between entities.
• Reactive Data Streams - Converts database subscriptions into asynchronous data streams to drive reactive user interface updates.
• Entity Associations - Enables the definition of associations and dependencies between data entities using variable properties.
• Database Object Browsers - Ships a locally hosted web browser for visualizing data objects, schemas, and dependency diagrams.
• Database Change Notifications - Provides triggers and observers that notify the application when specific database objects are modified.
• Persistence - Superfast object-oriented database.

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