ObjectBox C / C++ Database
This is the ObjectBox documentation for our C and C++ APIs. We strive to provide you with the easiest and fastest solution to store and retrieve data.
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Recommended bugfix release; please update.
- Fixes "Could not put (-30786)", which may occur in some corner cases on some platforms.
- Date properties can now be tagged as expiration time; which can be then be easily evicted
- Tree API: various additions and improvements, e.g. OBXTreeOptionFlags to configure the tree behavior
- New query condition to match objects that have a given number of relations
- New "max data size" store setting
- Enabled stricter compiler settings
- Added stacktraces on errors (Linux only; very lightweight as it uses external addr2line or llvm-symbolizer)
- Added log callback for most important logs
- Consolidated "user data" passing as the last parameter
- Various internal improvements
- Added BoxTypeless, QueryBuilderBase and QueryBase: these can be used without generated code and template types.
- New APIs to get the schema IDs for entity types and properties
- Added two methods to Store to await asynchronous processing
- Added "internal" namespace so that internal members do not spill into the obx namespace
- Move more implementations to OBX_CPP_FILE
- Custom protocols for Sync: plugin your own messaging protocol, which ObjectBox Sync will run on
- Improvements to run Sync Server with limited disk space (e.g. on small devices)
- Tree Sync improvements; e.g. consolidate conflicts
- WebSockets (sync protocol) is now a feature, which can be turned off (special build version)
- Performance optimizations
- Added a "weak store" API providing weak reference for stores (typically used by background threads)
- Added Store ID API, e.g. getting a store by its ID
- Various internal improvements including minor optimizations for binary size and performance
- New "OBX_CPP_FILE" define to place declarations in a single .cpp/.cc file: improves compilation time and results
- New "Exception" base class for all thrown exceptions
- Various internal improvements, e.g. a "internal" namespace to better distinguish from userland API
- Allow UTF-8 for database directories on Windows (available for other platforms before)
- Various internal improvements
- Promoted
Optionsto a top level class, as nested classes cannot be declared forward - New
#defineto disable FlatBuffers includes to simplify new project setup - Rename
ExceptiontoDbException - Minor improvements
- Add store cloning
- Fix attaching to a reopened store
- Fix non-unique indexes triggering unique constraint violations in corner cases (requires at least two unique constraints in an entity and a specific order; introduced in 0.15.0)
- Admin UI now supports multiple sessions to the same host using different ports (session ID via HTTP request)
- Minor performance improvements with hashed indexes
- Performance improvements for compression and decompression
- New "Flex" data type that can contain data of various types like integers, floating points, strings, lists and maps
- New query conditions for Flex lists to find a specific element
- New query conditions for Flex maps to find elements with a specific key or key/value pair
- New unique on-conflict strategy: replace conflicting objects (OBXPropertyFlags_UNIQUE_ON_CONFLICT_REPLACE)
- New functions to attach to existing stores using only the file path (in the same process)
- New APIs for ObjectBox Admin, the web based UI (formerly known as Object Browser): obx_admin_*
- Minor performance improvements for indexed access
- Major performance improvements for tree/GraphQL queries
- ARM binaries are now built for minimal size reducing the library size significantly
- New "no_reader_thread_locals" store option
- Enable debug logging (requires a special build)
- API: Type for query offsets and limits was changed from uint64_t to size_t
- API: rarely used obx_txn_mark_success() was removed; use obx_txn_success()
- API: feature checks consolidated to only use obx_has_feature()
- Many internal improvements
- Core version 3.0.1-2021-12-09
- New API for embedded server mode: obx_sync_server_* (implementation available on request)
Provides native dynamic/shared library (.so/.dylib/.dll)
- Provides C & C++ headers (objectbox.h & objectbox.hpp)
Last modified 4mo ago