完成大作业服务端代码，新建管理端，管理端不可用

Project/Service/func/search.py

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+from flask import render_template, request, g, abort, redirect, url_for
+from .config import db
+from .utils import get_cities
+import pymysql
+import datetime
+
+
+def search():
+    if not g.user:
+        return redirect(url_for("login"))
+    departure_city = request.args.get('departure')
+    destination_city = request.args.get('destination')
+    departure_date = request.args.get('departure-date')
+    passengers = int(request.args.get('passengers', 1))
+
+    # Date validation
+    try:
+        departure_date_obj = datetime.datetime.strptime(departure_date, '%Y-%m-%d').date()
+        if departure_date_obj < datetime.date.today():
+            abort(400, description="Departure date cannot be in the past.")
+    except ValueError:
+        abort(400, description="Invalid date format.")
+
+    conn = pymysql.connect(**db)
+    cursor = conn.cursor(pymysql.cursors.DictCursor)
+    
+    search_sql = """
+    SELECT f.*, d.Name as Departure_airport_name, a.Name as Arrival_airport_name
+    FROM Flights f
+    JOIN Airports d ON f.Departure_airport = d.ID
+    JOIN Airports a ON f.Arrival_airport = a.ID
+    WHERE d.City = %s AND a.City = %s 
+    AND DATE(f.Departure_time) = %s 
+    AND (f.First_class_seats_remaining + f.Business_class_seats_remaining + f.Economy_class_seats_remaining) >= %s
+    AND f.Status NOT IN ('已起飞', '已降落');
+    """
+    
+    cursor.execute(search_sql, (departure_city, destination_city, departure_date, passengers))
+    flights = cursor.fetchall()
+    
+    cursor.close()
+    conn.close()
+    
+    return render_template(
+        'search.html', 
+        cities=get_cities(), 
+        flights=flights, 
+        username=g.name
+    )