pgEdge Cloudに接続する

この例では、HyperdriveをpgEdge ↗ Postgresデータベースに接続する方法を示します。pgEdge Cloudは、完全に管理された、完全に分散された、安全なPostgresの簡単なデプロイを提供します。

1. Hyperdriveのアクセスを許可する

pgEdgeが提供するデフォルトのユーザーとパスワードを使用して、Hyperdriveを既存のpgEdgeデータベースに接続できます。

pgEdgeダッシュボード

1. pgEdgeダッシュボード ↗に移動し、接続したいデータベースを選択します。
2. データベースに接続するセクションから、接続文字列テキストボックスにある接続文字列（postgres://app@...で始まる）をメモします。

2. データベース構成を作成する

To configure Hyperdrive, you will need:

• The IP address (or hostname) and port of your database.
• The database username (for example, hyperdrive-demo) you configured in a previous step.
• The password associated with that username.
• The name of the database you want Hyperdrive to connect to. For example, postgres.

Hyperdrive accepts the combination of these parameters in the common connection string format used by database drivers:

postgres://USERNAME:PASSWORD@HOSTNAME_OR_IP_ADDRESS:PORT/database_name

Most database providers will provide a connection string you can directly copy-and-paste directly into Hyperdrive.

To create a Hyperdrive configuration with the Wrangler CLI, open your terminal and run the following command. Replace <NAME_OF_HYPERDRIVE_CONFIG> with a name for your Hyperdrive configuration and paste the connection string provided from your database host, or replace user, password, HOSTNAME_OR_IP_ADDRESS, port, and database_name placeholders with those specific to your database:

npx wrangler hyperdrive create <NAME_OF_HYPERDRIVE_CONFIG> --connection-string="postgres://user:password@HOSTNAME_OR_IP_ADDRESS:PORT/database_name"

ノート

Hyperdrive will attempt to connect to your database with the provided credentials to verify they are correct before creating a configuration. If you encounter an error when attempting to connect, refer to Hyperdrive’s troubleshooting documentation to debug possible causes.

This command outputs a binding for wrangler.toml:

name = "hyperdrive-example"
main = "src/index.ts"
compatibility_date = "2024-08-21"
compatibility_flags = ["nodejs_compat"]

# Pasted from the output of `wrangler hyperdrive create <NAME_OF_HYPERDRIVE_CONFIG> --connection-string=[...]` above.
[[hyperdrive]]
binding = "HYPERDRIVE"
id = "<ID OF THE CREATED HYPERDRIVE CONFIGURATION>"

Install the driver:

npm install postgres

Copy the below Worker code, which passes the connection string generated from env.HYPERDRIVE.connectionString directly to the driver.

import postgres from 'postgres'

export interface Env {
  // If you set another name in wrangler.toml as the value for 'binding',
  // replace "HYPERDRIVE" with the variable name you defined.
  HYPERDRIVE: Hyperdrive;
}

export default {
  async fetch(request, env, ctx): Promise<Response> {
    console.log(JSON.stringify(env));
    // Create a database client that connects to our database via Hyperdrive
    // Hyperdrive generates a unique connection string you can pass to
    // supported drivers, including node-postgres, Postgres.js, and the many
    // ORMs and query builders that use these drivers.
    const sql = postgres(env.HYPERDRIVE.connectionString)

    try {
      // Test query
      const result = await sql`SELECT * FROM pg_tables;`

      // Returns result rows as JSON
      return Response.json({ result: result });
    } catch (e) {
      console.log(e);
      return Response.json({ error: e.message }, { status: 500 });
    }
  },
} satisfies ExportedHandler<Env>;

Next steps

• Learn more about How Hyperdrive Works.
• Refer to the troubleshooting guide to debug common issues.
• Understand more about other storage options available to Cloudflare Workers.