存储搜索参数

Question

我目前正在.NET MVC 4中构建一个网站,使用Entity Framework访问SQL Server.

该网站应具有复杂的搜索功能,为用户提供多种选择,创建新搜索(免费搜索),从最近5次搜索中选择(历史搜索),从存储的搜索参数中进行选择.

我遇到的问题是保存搜索参数/ sql字符串的概念,因为它不是基于会话/缓存而应该存储在某个地方(SQL Server/MongoDB/XML)我很难获得最多优化路径,如果它是SQL方式,那么可能创建一个实体,将搜索参数存储为实体,然后将其转换为SQL字符串进行搜索,或者将其存储在XML中,而不是使用JSON进行序列化.

搜索的某些字段不是精确的数据库/实体匹配,需要求和/转换(如计算到特定时间的小时数).

我更倾向于为这个事业充分利用实体框架的能力.

如果可能的话,想听听一些专家的意见,谢谢.

Answer 1

不确定这是否是"最优化"的路径,但认为它似乎很容易实现:

//POCO class of item you want to search from database
public class SearchableItem
{
    public string Name { get; set; }
    public int Age { get; set; }
}

//MVC View Model for search page
public class SearchParamaters
{
    public int? MinAge { get; set; }
    public int? MaxAge { get; set; }
}

//Storable version for database
public class SavedSearchParameters : SearchParamters
{
    public int SavedSearchParametersId { get; set; }
}

//Use SearchParameters from MVC, or SavedSearchParamaters from EF
public IQueryable<SearchableItem> DoSearch(SearchParamaters sp)
{
    IQueryable<SearchableItem> query = db.SearchableItems;

    if (sp.MinAge.HasValue) query = query.Where(x => x.Age >= sp.MinAge.Value);
    if (sp.MaxAge.HasValue) query = query.Where(x => x.Age <= sp.MaxAge.Value);

    return query;
}

您还可以将SearchParameters类序列化为XML/JSON并将其保存在任何地方,然后对其进行反序列化并将其传递给DoSearch方法,然后每次要添加搜索参数时都不必更改数据库模式

编辑:使用序列化的完整示例

\域\ Person.cs

namespace YourApp.Domain
{
    public class Person
    {
        public string Name { get; set; }
        public int Age { get; set; }
    }
}

\域\ SavedPersonSearch.cs

namespace YourApp.Domain
{
    //Entity object with serialized PersonSearchParameters
    public class SavedPersonSearch
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Parameters { get; set; }
    }
}

\ \型号PersonSearchParameters.cs

namespace YourApp.Models
{
    //MVC View Model for search page
    public class PersonSearchParameters
    {
        public int? MinAge { get; set; }
        public int? MaxAge { get; set; }
    }
}

\助手\ SearchProvider.cs

using YourApp.Domain;
using YourApp.Models;

namespace YourApp.Helpers
{
    public class SearchProvider
    {
        private YourAppDbContext _context;

        public SearchProvider(YourAppDbContext context)
        {
            //This example uses the DbContext directly
            //but you could use a Unit of Work, repository, or whatever
            //design pattern you've decided on
            _context = context;
        }

        public IQueryable<Person> SearchPersons(int savedPersonSearchId)
        {
            var savedSearch = _context.SavedPersonSearches.Find(savedPersonSearchId);

            //deserialize (example assumes Newtonsoft.Json)
            var searchParams = JsonConvert.Deserialize<PersonSearchParameters>(savedSearch.Parameters);

            return SearchPersons(searchParams);
        }

        public IQueryable<Person> SearchPersons(PersonSearchParameters sp)
        {
            IQueryable<Person> query = _context.Persons;

            if (sp.MinAge.HasValue) query = query.Where(x => x.Age >= sp.MinAge.Value);
            if (sp.MaxAge.HasValue) query = query.Where(x => x.Age <= sp.MaxAge.Value);

            return query;
        }

        public void SavePersonSearch(PersonSearchParameters sp, string name)
        {
            var savedSearch = new SavedPersonSearch { Name = name };
            savedSearch.Parameters = JsonConvert.Serialize(sp);

            _context.SavedPersonSearches.Add(savedSearch);
            _context.SaveChanges();
        }
    }
}

\ \控制器PersonController.cs

namespace YourApp.Controllers
{
    public class PersonsController : Controller
    {
        private SearchProvider _provider;
        private YourAppDbContext _context;

        public PersonsController()
        {
            _context = new YourAppDbContext();
            _provider = new SearchProvider(_context);
        }

        //Manual search using form
        // GET: /Persons/Search?minAge=25&maxAge=30
        public ActionResult Search(PersonSearchParameters sp)
        {
            var results = _provider.SearchPersons(sp);
            return View("SearchResults", results);
        }

        //Saved search
        // GET: /Persons/SavedSearch/1
        public ActionResult SavedSearch(int id)
        {
            var results = _provider.SearchPersons(id);
            return View("SearchResults", results);
        }

        [HttpPost]
        public ActionResult SaveMySearch(PersonSearchParameters sp, name)
        {
            _provider.SavePersonSearch(sp, name);

            //Show success
            return View();
        }
    }
}