init

web/lib/db.ts

@@ -0,0 +1,48 @@
+import mysql, { type Pool, type PoolConnection, type RowDataPacket } from "mysql2/promise";
+
+let pool: Pool | undefined;
+
+export function getPool(): Pool {
+  if (!pool) {
+    const databaseUrl = process.env.DATABASE_URL;
+    if (!databaseUrl) throw new Error("DATABASE_URL is not set");
+    const url = new URL(databaseUrl);
+    pool = mysql.createPool({
+      host: url.hostname,
+      port: url.port ? Number(url.port) : 3306,
+      user: decodeURIComponent(url.username),
+      password: decodeURIComponent(url.password),
+      database: decodeURIComponent(url.pathname.replace(/^\//, "")),
+      connectionLimit: 10,
+      dateStrings: true,
+      timezone: "Z",
+      charset: "utf8mb4",
+      supportBigNumbers: true,
+      multipleStatements: false,
+    });
+  }
+  return pool;
+}
+
+export async function closePool(): Promise<void> {
+  if (!pool) return;
+  await pool.end();
+  pool = undefined;
+}
+
+export async function withTransaction<T>(fn: (conn: PoolConnection) => Promise<T>): Promise<T> {
+  const conn = await getPool().getConnection();
+  try {
+    await conn.beginTransaction();
+    const result = await fn(conn);
+    await conn.commit();
+    return result;
+  } catch (error) {
+    await conn.rollback();
+    throw error;
+  } finally {
+    conn.release();
+  }
+}
+
+export type { RowDataPacket };