56 lines
1.8 KiB
C#
56 lines
1.8 KiB
C#
using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Hosting;
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using Microsoft.EntityFrameworkCore;
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using System;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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using Parking_space_WebAPI.Services;
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public class ParkingLogCleanupService : BackgroundService
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{
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private readonly IServiceScopeFactory _scopeFactory;
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public ParkingLogCleanupService(IServiceScopeFactory scopeFactory)
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{
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_scopeFactory = scopeFactory;
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}
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protected override async Task ExecuteAsync(CancellationToken stoppingToken)
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{
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while (!stoppingToken.IsCancellationRequested)
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{
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using (var scope = _scopeFactory.CreateScope())
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{
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var _context = scope.ServiceProvider.GetRequiredService<SqlContext>();
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try
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{
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// 計算三個月前的日期
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DateTime threeMonthsAgo = DateTime.Now.AddMonths(-3);
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// 查找三個月前的資料
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var oldLogs = await _context.ParkingLogs
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.Where(log => log.Timestamp < threeMonthsAgo)
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.ToListAsync();
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if (oldLogs.Any())
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{
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_context.ParkingLogs.RemoveRange(oldLogs);
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await _context.SaveChangesAsync();
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Console.WriteLine($"{oldLogs.Count} old parking logs deleted.");
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}
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}
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catch (Exception ex)
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{
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// 錯誤顯示
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Console.WriteLine($"An error occurred during cleanup: {ex.Message}");
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}
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}
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// 每 24 小時執行一次清理
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await Task.Delay(TimeSpan.FromDays(1), stoppingToken);
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}
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}
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}
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