|
| 1 | +# sqlite_vector |
| 2 | + |
| 3 | +SQLite Vector extension for Flutter/Dart. Provides vector search with SIMD-optimized distance functions (L2, cosine, dot product) for Float32, Float16, Int8, and 1Bit vectors. |
| 4 | + |
| 5 | +## Installation |
| 6 | + |
| 7 | +``` |
| 8 | +dart pub add sqlite_vector |
| 9 | +``` |
| 10 | + |
| 11 | +Requires Dart 3.10+ / Flutter 3.38+. |
| 12 | + |
| 13 | +## Usage |
| 14 | + |
| 15 | +### With `sqlite3` |
| 16 | + |
| 17 | +```dart |
| 18 | +import 'package:sqlite3/sqlite3.dart'; |
| 19 | +import 'package:sqlite_vector/sqlite_vector.dart'; |
| 20 | +
|
| 21 | +void main() { |
| 22 | + // Load once at startup. |
| 23 | + sqlite3.loadSqliteVectorExtension(); |
| 24 | +
|
| 25 | + final db = sqlite3.openInMemory(); |
| 26 | +
|
| 27 | + // Create a regular table with a BLOB column for vectors. |
| 28 | + db.execute('CREATE TABLE items (id INTEGER PRIMARY KEY, embedding BLOB)'); |
| 29 | +
|
| 30 | + // Insert vectors. |
| 31 | + final stmt = db.prepare('INSERT INTO items (embedding) VALUES (vector_as_f32(?))'); |
| 32 | + stmt.execute(['[1.0, 2.0, 3.0, 4.0]']); |
| 33 | + stmt.dispose(); |
| 34 | +
|
| 35 | + // Initialize the vector index. |
| 36 | + db.execute("SELECT vector_init('items', 'embedding', 'type=FLOAT32,dimension=4')"); |
| 37 | +
|
| 38 | + // Find the 2 nearest neighbors. |
| 39 | + final results = db.select(''' |
| 40 | + SELECT e.id, v.distance FROM items AS e |
| 41 | + JOIN vector_full_scan('items', 'embedding', vector_as_f32('[1.0, 2.0, 3.0, 4.0]'), 2) AS v |
| 42 | + ON e.id = v.rowid |
| 43 | + '''); |
| 44 | +
|
| 45 | + db.dispose(); |
| 46 | +} |
| 47 | +``` |
| 48 | + |
| 49 | +### With `drift` |
| 50 | + |
| 51 | +```dart |
| 52 | +import 'package:sqlite3/sqlite3.dart'; |
| 53 | +import 'package:sqlite_vector/sqlite_vector.dart'; |
| 54 | +import 'package:drift/native.dart'; |
| 55 | +
|
| 56 | +Sqlite3 loadExtensions() { |
| 57 | + sqlite3.loadSqliteVectorExtension(); |
| 58 | + return sqlite3; |
| 59 | +} |
| 60 | +
|
| 61 | +// Use when creating the database: |
| 62 | +NativeDatabase.createInBackground( |
| 63 | + File(path), |
| 64 | + sqlite3: loadExtensions, |
| 65 | +); |
| 66 | +``` |
| 67 | + |
| 68 | +## Supported platforms |
| 69 | + |
| 70 | +| Platform | Architectures | |
| 71 | +|----------|---------------| |
| 72 | +| Android | arm64, arm, x64 | |
| 73 | +| iOS | arm64 (device + simulator) | |
| 74 | +| macOS | arm64, x64 | |
| 75 | +| Linux | arm64, x64 | |
| 76 | +| Windows | x64 | |
| 77 | + |
| 78 | +## API |
| 79 | + |
| 80 | +See the full [sqlite-vector API documentation](https://github.com/sqliteai/sqlite-vector/blob/main/API.md). |
| 81 | + |
| 82 | +## License |
| 83 | + |
| 84 | +See [LICENSE](LICENSE). |
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