|
| 1 | +import { createClient } from "@libsql/client"; |
| 2 | +import reader from "readline-sync"; |
| 3 | + |
| 4 | +async function example() { |
| 5 | + const config = { |
| 6 | + url: process.env.URL ?? "file:local.db", |
| 7 | + syncUrl: process.env.SYNC_URL, |
| 8 | + authToken: process.env.AUTH_TOKEN, |
| 9 | + }; |
| 10 | + const db = createClient(config); |
| 11 | + await db.sync(); |
| 12 | + await db.execute( |
| 13 | + "CREATE TABLE IF NOT EXISTS movies (title TEXT, embedding FLOAT32(4))", |
| 14 | + ); |
| 15 | + await db.execute( |
| 16 | + "CREATE INDEX IF NOT EXISTS movies_idx ON movies (libsql_vector_idx(embedding))", |
| 17 | + ); |
| 18 | + await db.sync(); |
| 19 | + |
| 20 | + const title = reader.question("Add movie (title): "); |
| 21 | + const embedding = reader.question( |
| 22 | + "Add movie (embedding, e.g. [1,2,3,4]): ", |
| 23 | + ); |
| 24 | + |
| 25 | + await db.execute({ |
| 26 | + sql: "INSERT INTO movies (title, embedding) VALUES (?, vector32(?))", |
| 27 | + args: [title, embedding], |
| 28 | + }); |
| 29 | + |
| 30 | + await db.sync(); |
| 31 | + |
| 32 | + const all = await db.execute( |
| 33 | + "SELECT title, vector_extract(embedding) as embedding FROM movies", |
| 34 | + ); |
| 35 | + console.info("all movies:"); |
| 36 | + for (const row of all.rows) { |
| 37 | + console.log(" - " + row.title + ": " + row.embedding); |
| 38 | + } |
| 39 | + |
| 40 | + const query = reader.question("KNN query (e.g. [1,2,3,4]): "); |
| 41 | + const nn = await db.execute({ |
| 42 | + sql: "SELECT title, vector_extract(embedding) as embedding FROM vector_top_k('movies_idx', vector32(?), 2) as knn JOIN movies ON knn.id = movies.rowid", |
| 43 | + args: [query], |
| 44 | + }); |
| 45 | + console.info("nearest neighbors:"); |
| 46 | + for (const row of nn.rows) { |
| 47 | + console.log(" - " + row.title + ": " + row.embedding); |
| 48 | + } |
| 49 | +} |
| 50 | + |
| 51 | +example(); |
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