初始化：连锁餐饮数字化运营管理平台

server/src/config/database.ts

@@ -0,0 +1,48 @@
+import pg from 'pg'
+
+const { Pool } = pg
+
+const pool = new Pool({
+  host: process.env.DB_HOST || 'localhost',
+  port: parseInt(process.env.DB_PORT || '5432'),
+  database: process.env.DB_NAME || 'bill_query',
+  user: process.env.DB_USER || 'freedak',
+  password: process.env.DB_PASSWORD || '',
+  max: parseInt(process.env.DB_POOL_MAX || '10'),
+})
+
+pool.on('error', (err) => {
+  console.error('Unexpected error on idle client', err)
+})
+
+export interface QueryResult<T = any> {
+  rows: T[]
+  rowCount: number | null
+}
+
+export async function query<T = any>(text: string, params?: any[]): Promise<QueryResult<T>> {
+  const start = Date.now()
+  const res = await pool.query(text, params)
+  const duration = Date.now() - start
+  if (duration > 500) {
+    console.warn(`Slow query (${duration}ms):`, text.substring(0, 100))
+  }
+  return res
+}
+
+export async function withTransaction<T>(callback: (client: pg.PoolClient) => Promise<T>): Promise<T> {
+  const client = await pool.connect()
+  try {
+    await client.query('BEGIN')
+    const result = await callback(client)
+    await client.query('COMMIT')
+    return result
+  } catch (err) {
+    await client.query('ROLLBACK')
+    throw err
+  } finally {
+    client.release()
+  }
+}
+
+export default pool