ObjectBox is a superfast lightweight database for objects
ObjectBox Python API
ObjectBox is a superfast database for objects, now also available for Python with a simple CRUD API.
- Python version: 3.4+
- Platforms supported:
- Linux x86-64 (64-bit)
- Linux ARMv6hf (e.g. Raspberry PI Zero)
- Linux ARMv7hf (e.g. Raspberry PI 3)
- MacOS x86-64 (64-bit)
- MacOS arm64 (Apple silicon)
- Windows x86-64 (64-bit)
First of all, install the latest version:
pip install --upgrade objectbox
To start using ObjectBox as a storage for your data, you need to define your model first.
The model consists of Python classes annotated with
Model IDs and UIDs
Each Entity has to have an ID (unique among entities). Properties need an ID as well (unique inside one Entity). Both Entities and Properties must also have an UID, which is a globally unique identifier.
For other ObjectBox supported languages, the binding takes care of assigning these IDs/UIDs but this feature is not yet implemented for Python. To learn more, see ObjectBox Java documentation
from objectbox.model import * @Entity(id=1, uid=1) class Person: id = Id(id=1, uid=1001) name = Property(str, id=2, uid=1002) is_enabled = Property(bool, id=3, uid=1003) # int can be stored with 64 (default), 32, 16 or 8 bit precision. int64 = Property(int, id=4, uid=1004) int32 = Property(int, type=PropertyType.int, id=5, uid=1005) int16 = Property(int, type=PropertyType.short, id=6, uid=1006) int8 = Property(int, type=PropertyType.byte, id=7, uid=1007) # float can be stored with 64 or 32 (default) bit precision. float64 = Property(float, id=8, uid=1008) float32 = Property(float, type=PropertyType.float, id=9, uid=1009) byte_array = Property(bytes, id=10, uid=1010) # Regular properties are not stored. transient = ""
To actually use the database, you launch (or "build") it with the model you've just defined.
Afterwards, you can reuse the instance (
ob in the example below) and use it to access "Entity Boxes" which hold your objects.
import objectbox # from mypackage.model import Person # Configure ObjectBox: should be done only once in the whole program and the "ob" variable should be kept around model = objectbox.Model() model.entity(Person, last_property_id=objectbox.model.IdUid(10, 1010)) model.last_entity_id = objectbox.model.IdUid(1, 1) ob = objectbox.Builder().model(model).directory("db").build() # Open the box of "Person" entity. This can be called many times but you can also pass the variable around box = objectbox.Box(ob, Person) id = box.put(Person(name="Joe Green")) # Create person = box.get(id) # Read person.name = "Joe Black" box.put(person) # Update box.remove(person) # Delete
Additionally, see the TaskList example app. After checking out this repository to run the example:
// Set up virtual environment, download ObjectBox libraries make depend // Activate virtual environment... // ...on Linux source .venv/bin/activate // ...on Windows .venv\Scripts\activate // Run the example python3 -m example // Once done, leave the virtual environment deactivate
For more information and code examples, see the tests folder. The docs for other languages may also help you understand the basics.
- ObjectBox Java/Dart/Flutter - https://docs.objectbox.io
- ObjectBox Go - https://golang.objectbox.io
- ObjectBox Swift - https://swift.objectbox.io
- automatic transactions (ACID compliant)
- bulk operations
Coming in the future
The goodness you know from the other ObjectBox language-bindings, e.g.,
- model management (no need to manually set id/uid)
- automatic model migration (no schema upgrade scripts etc.)
- powerful queries
- relations (to-one, to-many)
- asynchronous operations
- secondary indexes
ObjectBox for Python is still in an early stage with limited feature set (compared to other languages). To bring all these features to Python, we're asking the community to help out. PRs are more than welcome! The ObjectBox team will try its best to guide you and answer questions. See CONTRIBUTING.md to get started.
Also, please let us know your feedback by opening an issue: for example, if you experience errors or if you have ideas for how to improve the API. Thanks!
Copyright 2019-2021 ObjectBox Ltd. All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
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