changes for ncruces go

examples/simple-go-ncruces/demo.go

@@ -0,0 +1,114 @@
+package main
+
+import (
+	"bytes"
+	_ "embed"
+	"encoding/binary"
+	"fmt"
+	"log"
+
+	"github.com/ncruces/go-sqlite3"
+)
+
+func serializeFloat32(vector []float32) ([]byte, error) {
+	buf := new(bytes.Buffer)
+	err := binary.Write(buf, binary.LittleEndian, vector)
+	if err != nil {
+		return nil, err
+	}
+	return buf.Bytes(), nil
+}
+
+const memory = ":memory:"
+
+//go:embed sqlite3.vec.wasm
+var sqliteWithVecWasm []byte
+
+func main() {
+	sqlite3.Binary = sqliteWithVecWasm
+
+	db, err := sqlite3.Open(memory)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	stmt, _, err := db.Prepare(`SELECT sqlite_version(), vec_version()`)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+
+	err = db.Exec("CREATE VIRTUAL TABLE vec_items USING vec0(embedding float[4])")
+	if err != nil {
+		log.Fatal(err)
+	}
+	items := map[int][]float32{
+		1: {0.1, 0.1, 0.1, 0.1},
+		2: {0.2, 0.2, 0.2, 0.2},
+		3: {0.3, 0.3, 0.3, 0.3},
+		4: {0.4, 0.4, 0.4, 0.4},
+		5: {0.5, 0.5, 0.5, 0.5},
+	}
+	q := []float32{0.3, 0.3, 0.3, 0.3}
+
+	stmt, _, err = db.Prepare("INSERT INTO vec_items(rowid, embedding) VALUES (?, ?)")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	for id, values := range items {
+		v, err := serializeFloat32(values)
+		if err != nil {
+			log.Fatal(err)
+		}
+		stmt.BindInt(1, id)
+		stmt.BindBlob(2, v)
+		err = stmt.Exec()
+		if err != nil {
+			log.Fatal(err)
+		}
+		stmt.Reset()
+	}
+	stmt.Close()
+
+
+
+	stmt, _, err = db.Prepare(`
+		SELECT
+			rowid,
+			distance
+		FROM vec_items
+		WHERE embedding MATCH ?
+		ORDER BY distance
+		LIMIT 3
+	`);
+
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	query, err := serializeFloat32(q)
+	if err != nil {
+		log.Fatal(err)
+	}
+	stmt.BindBlob(1, query)
+
+	for stmt.Step() {
+		rowid := stmt.ColumnInt64(0)
+		distance := stmt.ColumnFloat(1)
+		fmt.Printf("rowid=%d, distance=%f\n", rowid, distance)
+	}
+	if err := stmt.Err(); err != nil {
+		log.Fatal(err)
+	}
+
+	err = stmt.Close()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	err = db.Close()
+	if err != nil {
+		log.Fatal(err)
+	}
+}