feat: 完善采购申请流程 - 添加审批、执行、列表筛选排序功能

backup_20260327/company-finance-system/backend/db.js

@@ -0,0 +1,28 @@
+const { Pool } = require('pg');
+require('dotenv').config();
+
+const pool = new Pool({
+  host: process.env.DB_HOST,
+  port: process.env.DB_PORT,
+  database: process.env.DB_NAME,
+  user: process.env.DB_USER,
+  password: process.env.DB_PASSWORD,
+  max: 20,
+  idleTimeoutMillis: 30000,
+  connectionTimeoutMillis: 2000,
+});
+
+// 测试数据库连接
+pool.on('connect', () => {
+  console.log('Database connected successfully');
+});
+
+pool.on('error', (err) => {
+  console.error('Unexpected error on idle client', err);
+  process.exit(-1);
+});
+
+module.exports = {
+  query: (text, params) => pool.query(text, params),
+  pool,
+};