diff --git a/_examples/d1-blog-server/Makefile b/_examples/d1-blog-server/Makefile
index 40a9d05..1e41aac 100644
--- a/_examples/d1-blog-server/Makefile
+++ b/_examples/d1-blog-server/Makefile
@@ -15,6 +15,6 @@ deploy:
 init-db:
 	wrangler d1 execute d1-blog-server --file=./schema.sql
 
-.PHONY: init-db-preview
-init-db-preview:
-	wrangler d1 execute d1-blog-server-preview --file=./schema.sql
+.PHONY: init-db-local
+init-db-local:
+	wrangler d1 execute d1-blog-server --file=./schema.sql --local
diff --git a/_examples/d1-blog-server/README.md b/_examples/d1-blog-server/README.md
index 98250cc..e4ce37b 100644
--- a/_examples/d1-blog-server/README.md
+++ b/_examples/d1-blog-server/README.md
@@ -65,9 +65,9 @@ This project requires these tools to be installed globally.
 
 ```
 # development
-make init-db-preview # initialize preview DB (remove all rows)
-make dev             # run dev server
-make build           # build Go Wasm binary
+make init-db-local # initialize local DB (remove all rows)
+make dev           # run dev server
+make build         # build Go Wasm binary
 
 # production
 make init-db # initialize production DB (remove all rows)
diff --git a/_examples/d1-blog-server/app/handler.go b/_examples/d1-blog-server/app/handler.go
index 0251f72..4fd78ca 100644
--- a/_examples/d1-blog-server/app/handler.go
+++ b/_examples/d1-blog-server/app/handler.go
@@ -10,34 +10,27 @@ import (
 	"time"
 
 	"github.com/syumai/workers/_examples/d1-blog-server/app/model"
-	"github.com/syumai/workers/cloudflare/d1"
-	_ "github.com/syumai/workers/cloudflare/d1" // register driver
 )
 
-type articleHandler struct{}
+type articleHandler struct {
+	db *sql.DB
+}
 
 var _ http.Handler = (*articleHandler)(nil)
 
-func NewArticleHandler() http.Handler {
-	return &articleHandler{}
+func NewArticleHandler(db *sql.DB) http.Handler {
+	return &articleHandler{
+		db: db,
+	}
 }
 
 func (h *articleHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
-	// initialize DB.
-	// D1 connector requires request's context to initialize DB.
-	c, err := d1.OpenConnector("BlogDB")
-	if err != nil {
-		h.handleErr(w, http.StatusInternalServerError, fmt.Sprintf("failed to initialize DB: %v", err))
-	}
-	// use sql.OpenDB instead of sql.Open.
-	db := sql.OpenDB(c)
-
 	switch req.Method {
 	case http.MethodGet:
-		h.listArticles(w, req, db)
+		h.listArticles(w, req)
 		return
 	case http.MethodPost:
-		h.createArticle(w, req, db)
+		h.createArticle(w, req)
 		return
 	}
 	w.WriteHeader(http.StatusNotFound)
@@ -51,7 +44,7 @@ func (h *articleHandler) handleErr(w http.ResponseWriter, status int, msg string
 	w.Write([]byte(msg))
 }
 
-func (h *articleHandler) createArticle(w http.ResponseWriter, req *http.Request, db *sql.DB) {
+func (h *articleHandler) createArticle(w http.ResponseWriter, req *http.Request) {
 	var createArticleReq model.CreateArticleRequest
 	if err := json.NewDecoder(req.Body).Decode(&createArticleReq); err != nil {
 		h.handleErr(w, http.StatusBadRequest,
@@ -66,7 +59,7 @@ func (h *articleHandler) createArticle(w http.ResponseWriter, req *http.Request,
 		CreatedAt: uint64(now),
 	}
 
-	result, err := db.Exec(`
+	result, err := h.db.Exec(`
 INSERT INTO articles (title, body, created_at)
 VALUES (?, ?, ?)
    `, article.Title, article.Body, article.CreatedAt)
@@ -95,12 +88,13 @@ VALUES (?, ?, ?)
 	}
 }
 
-func (h *articleHandler) listArticles(w http.ResponseWriter, req *http.Request, db *sql.DB) {
-	rows, err := db.Query(`
+func (h *articleHandler) listArticles(w http.ResponseWriter, req *http.Request) {
+	rows, err := h.db.Query(`
 SELECT id, title, body, created_at FROM articles
 ORDER BY created_at DESC;
    `)
 	if err != nil {
+		fmt.Printf("err: %v\n", err)
 		h.handleErr(w, http.StatusInternalServerError,
 			"failed to load article")
 		return
diff --git a/_examples/d1-blog-server/main.go b/_examples/d1-blog-server/main.go
index 98d3dfb..abbcaee 100644
--- a/_examples/d1-blog-server/main.go
+++ b/_examples/d1-blog-server/main.go
@@ -1,13 +1,20 @@
 package main
 
 import (
+	"database/sql"
+	"log"
 	"net/http"
 
 	"github.com/syumai/workers"
 	"github.com/syumai/workers/_examples/d1-blog-server/app"
+	_ "github.com/syumai/workers/cloudflare/d1" // register driver
 )
 
 func main() {
-	http.Handle("/articles", app.NewArticleHandler())
+	db, err := sql.Open("d1", "BlogDB")
+	if err != nil {
+		log.Fatalf("error opening DB: %s", err.Error())
+	}
+	http.Handle("/articles", app.NewArticleHandler(db))
 	workers.Serve(nil) // use http.DefaultServeMux
 }
diff --git a/_examples/d1-blog-server/wrangler.toml b/_examples/d1-blog-server/wrangler.toml
index c86da8a..a935a52 100644
--- a/_examples/d1-blog-server/wrangler.toml
+++ b/_examples/d1-blog-server/wrangler.toml
@@ -1,6 +1,6 @@
 name = "d1-blog-server"
 main = "./build/worker.mjs"
-compatibility_date = "2023-01-09"
+compatibility_date = "2024-04-15"
 
 [build]
 command = "make build"
diff --git a/cloudflare/d1/driver.go b/cloudflare/d1/driver.go
index c67e7af..12a417d 100644
--- a/cloudflare/d1/driver.go
+++ b/cloudflare/d1/driver.go
@@ -1,9 +1,9 @@
 package d1
 
 import (
+	"context"
 	"database/sql"
 	"database/sql/driver"
-	"errors"
 )
 
 func init() {
@@ -16,6 +16,10 @@ var (
 	_ driver.Driver = (*Driver)(nil)
 )
 
-func (d *Driver) Open(string) (driver.Conn, error) {
-	return nil, errors.New("d1: Open is not supported. use d1.OpenConnector and sql.OpenDB instead")
+func (d *Driver) Open(name string) (driver.Conn, error) {
+	connector, err := OpenConnector(name)
+	if err != nil {
+		return nil, err
+	}
+	return connector.Connect(context.Background())
 }