MySQL に接続する

# wrangler v3.11 and above required
npx wrangler hyperdrive create my-first-hyperdrive --connection-string="mysql://user:password@database.host.example.com:3306/databasenamehere"

// mysql2 v3.13.0 or later is required
import { createConnection } from "mysql2/promise";

export default {
	async fetch(request, env, ctx): Promise<Response> {
		// Create a new connection on each request. Hyperdrive maintains the underlying
		// database connection pool, so creating a new connection is fast.
		const connection = await createConnection({
			host: env.HYPERDRIVE.host,
			user: env.HYPERDRIVE.user,
			password: env.HYPERDRIVE.password,
			database: env.HYPERDRIVE.database,
			port: env.HYPERDRIVE.port,

			// Required to enable mysql2 compatibility for Workers
			disableEval: true,
		});

		try {
			// Sample query
			const [results, fields] = await connection.query("SHOW tables;");

			// Return result rows as JSON
			return Response.json({ results, fields });
		} catch (e) {
			console.error(e);
			return Response.json(
				{ error: e instanceof Error ? e.message : e },
				{ status: 500 },
			);
		}
	},
} satisfies ExportedHandler<Env>;

import { createConnection } from "mysql";

export default {
	async fetch(request, env, ctx): Promise<Response> {
		const result = await new Promise<any>((resolve) => {
			// Create a connection using the mysql driver with the Hyperdrive credentials (only accessible from your Worker).
			const connection = createConnection({
				host: env.HYPERDRIVE.host,
				user: env.HYPERDRIVE.user,
				password: env.HYPERDRIVE.password,
				database: env.HYPERDRIVE.database,
				port: env.HYPERDRIVE.port,
			});

			connection.connect((error: { message: string }) => {
				if (error) {
					throw new Error(error.message);
				}

				// Sample query
				connection.query("SHOW tables;", [], (error, rows, fields) => {
					resolve({ fields, rows });
				});
			});
		});

		// Return result  as JSON
		return new Response(JSON.stringify(result), {
			headers: {
				"Content-Type": "application/json",
			},
		});
	},
} satisfies ExportedHandler<Env>;