增加数据-人民币汇率

pages/api/exchange-rate.js

@@ -98,8 +98,11 @@ export default async function handler(req, res) {
       error: error.message
     });
   } finally {
-    if (pool) {
-      await pool.end();
-    }
+    // 不关闭连接池，保持连接池打开以提高性能
+    // 如果需要关闭连接池，应该在关闭后将 pool 变量设置为 null
+    // if (pool) {
+    //   await pool.end();
+    //   pool = null;
+    // }
   }
 }

pages/data.js

@@ -2,6 +2,7 @@ import { useState, useEffect } from 'react'
 import Head from 'next/head'
 import Navbar from '../components/Navbar'
 import Footer from '../components/Footer'
+import TimeRangePicker from '../components/TimeRangePicker'
 import { LineChart, Line, XAxis, YAxis, CartesianGrid, Tooltip, Legend, ResponsiveContainer } from 'recharts'
 
 const chinaBondData = [
@@ -162,18 +163,39 @@ export default function Data() {
   const [exchangeRateData, setExchangeRateData] = useState([])
   const [loading, setLoading] = useState(false)
   const [error, setError] = useState(null)
+  const [timeRange, setTimeRange] = useState('1m') // 1m: 近一个月, 3m: 近三个月, 1y: 近一年, custom: 自定义
+  const [startDate, setStartDate] = useState('')
+  const [endDate, setEndDate] = useState('')
 
   useEffect(() => {
     if (selectedIndicator === 'central-bank-usd-cny-rate') {
       fetchExchangeRateData()
     }
-  }, [selectedIndicator])
+  }, [selectedIndicator, timeRange, startDate, endDate])
+
+  const handleTimeRangeChange = (range, start, end) => {
+    setTimeRange(range)
+    setStartDate(start)
+    setEndDate(end)
+  }
 
   const fetchExchangeRateData = async () => {
     setLoading(true)
     setError(null)
     try {
-      const response = await fetch('/api/exchange-rate?limit=60')
+      let url = '/api/exchange-rate'
+      
+      if (timeRange === 'custom' && startDate && endDate) {
+        url += `?startDate=${startDate}&endDate=${endDate}`
+      } else if (timeRange === '1m') {
+        url += '?limit=30'
+      } else if (timeRange === '3m') {
+        url += '?limit=90'
+      } else if (timeRange === '1y') {
+        url += '?limit=365'
+      }
+      
+      const response = await fetch(url)
       const data = await response.json()
       if (data.success) {
         setExchangeRateData(data.data)
@@ -566,6 +588,13 @@ export default function Data() {
                   <div className="error">{error}</div>
                 ) : (
                   <>
+                    <div className="chart-header">
+                      <TimeRangePicker 
+                        value={timeRange}
+                        onChange={handleTimeRangeChange}
+                      />
+                    </div>
+                    
                     <div className="chart-container">
                       <ResponsiveContainer width="100%" height={500}>
                         <LineChart data={exchangeRateData} margin={{ top: 20, right: 30, left: 20, bottom: 5 }}>