coffy 0.1.4

Lightweight local NoSQL, SQL, and Graph embedded database engine

☕ Coffy

Coffy is a lightweight embedded database engine for Python, designed for local-first apps, scripts, and tools. It includes:

• coffy.nosql: A simple JSON-backed NoSQL engine with a fluent, chainable query interface
• coffy.graph: An graph engine built on networkx with advanced filtering and logic-based querying
• coffy.sql: A wrapper over SQLite for executing raw SQL

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Latest Updates

• Added projection and dot-notation support for nested fields in NoSQL queries. Expanded logic chaining (_and, _or, _not) with improved test and better query semantics.
• GraphDB now supports saving query results, fixed relationship type serialization, and added more robust unit coverage.
• Unit tests added to test NoSQL and Graph database features.
• Documentation Updated.

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🔧 Install

pip install coffy

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📂 Modules

coffy.nosql

• Embedded NoSQL document store with a fluent, chainable query API
• Supports nested fields, logical filters, aggregations, projections, and joins
• Built for local usage with optional persistence; minimal setup, fast iteration

📄 NoSQL Documentation →

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coffy.graph

• Lightweight, file-backed graph database using networkx under the hood
• Supports pattern matching, label/type filtering, logical conditions, and projections
• Query results can be saved, updated, or transformed; ideal for local, schema-flexible graph data

📄 Graph Documentation →

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coffy.sql

• SQLite-backed engine with raw SQL query support
• Outputs as readable tables or exportable lists
• Uses in-memory DB by default, or json-based if initialized with a path

📄 SQL Documentation →

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🧪 Example

from coffy.nosql import db

users = db("users", path="users.json")
users.add({"id": 1, "name": "Neel"})
print(users.where("name").eq("Neel").first())

from coffy.graph import GraphDB

g = GraphDB(directed=True)
g.add_nodes([{"id": 1, "name": "Neel"}, {"id": 2, "name": "Tanaya"}])
g.add_relationships([{"source": 1, "target": 2, "type": "friend"}])
print(g.find_relationships(type="friend"))

from coffy.sql import init, query

init("app.db")
query("CREATE TABLE test (id INT, name TEXT)")
query("INSERT INTO test VALUES (1, 'Neel')")
print(query("SELECT * FROM test"))

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📄 License

MIT © 2025 nsarathy