0
我認爲我的場景是任何應用程序中的常見場景。我將舉例說明使用一個常用的域：產品和訂單（產品）。如何通過RavenDb中的相關文檔字段創建搜索索引？
我試圖做的是按產品名稱搜索訂單，考慮到訂單有一個itens列表，每個項目都有一個相關的productId。
我做了一些搜索和閱讀Raven文檔，但我無法找到我的問題的答案。
請考慮下面的代碼：
public class Product
{
public string Id { get; set; }
public string ProductName { get; set; }
public decimal Price { get; set; }
}
public class Order
{
public string Id { get; set; }
public string OrderNumber { get; set; }
public decimal Total { get; set; }
public string Customer { get; set; }
public Item[] Items { get; set; }
}
public class Item
{
public string ProductId { get; set; }
public decimal Price { get; set; }
public int Quantity { get; set; }
}
public class Order_ByProductName : AbstractMultiMapIndexCreationTask<Order_ByProductName.Result>
{
public class Result
{
public string ProductId { get; set; }
public string ProductName { get; set; }
public string[] OrdersIds { get; set; }
public string[] OrdersNumbers { get; set; }
}
public Order_ByProductName()
{
AddMap<Product>(products => from product in products
select new
{
ProductId = product.Id,
ProductName = product.ProductName,
OrderId = default(string),
OrderNumber = default(string)
});
AddMap<Order>(orders => from order in orders
group order by order.Items.Select(c => c.ProductId)
into g
select new
{
ProductId = g.Key,
ProductName = default(string),
OrdersIds = g.Select(c => c.Id),
OrdersNumbers = g.Select(c => c.OrderNumber)
});
Reduce = results => from result in results
group result by result.ProductId
into g
select new
{
ProductId = g.Key,
ProductName = g.Select(r => r.ProductName).Where(t => t != null).First(),
OrdersIds = g.Where(r => r.OrdersIds != null).SelectMany(r => r.OrdersIds),
OrdersNumbers = g.Where(r => r.OrdersNumbers != null).SelectMany(r => r.OrdersNumbers)
};
Sort("ProductName", SortOptions.String);
Index(x => x.ProductName, FieldIndexing.Analyzed);
}
}
class Program
{
static void Main(string[] args)
{
var documentStore = new DocumentStore
{
Url = "http://localhost:8080",
DefaultDatabase = "MyDatabase"
};
documentStore.Initialize();
new Order_ByProductName().Execute(documentStore);
using (var session = documentStore.OpenSession())
{
var product1 = new Product() { Price = 100, ProductName = "Phone" };
var product2 = new Product() { Price = 1000, ProductName = "Laptop" };
var product3 = new Product() { Price = 200, ProductName = "Windows Phone" };
session.Store(product1);
session.Store(product2);
session.Store(product3);
session.SaveChanges();
}
using (var session = documentStore.OpenSession())
{
var products = session.Query<Product>().ToList();
var order1 = new Order();
order1.Customer = "Jhon Doe";
order1.OrderNumber = "001";
order1.Items = new Item[] {
new Item { ProductId = products[0].Id, Price = products[0].Price, Quantity = 1 },
new Item { ProductId = products[1].Id, Price = products[1].Price, Quantity = 1 }
};
order1.Total = order1.Items.Sum(c => (c.Quantity * c.Price));
var order2 = new Order();
order2.Customer = "Joan Doe";
order2.OrderNumber = "002";
order2.Items = new Item[] {
new Item { ProductId = products[2].Id, Price = products[2].Price, Quantity = 1 }
};
order2.Total = order2.Items.Sum(c => (c.Quantity * c.Price));
session.Store(order1);
session.Store(order2);
session.SaveChanges();
}
using (var session = documentStore.OpenSession())
{
var results = session
.Query<Order_ByProductName.Result, Order_ByProductName>()
.Where(x => x.ProductName == "Phone")
.ToList();
foreach (var item in results)
{
Console.WriteLine($"{item.ProductName}\t{string.Join(", ", item.OrdersNumbers)}");
}
Console.ReadKey();
}
}
}
我發現了一個相關的問題在這裏How to index related documents in reverse direction in Ravendb，但這種情況是有點不同。如果您評論索引創建，則會運行上述代碼，但會另外發出異常：「無法理解查詢：變量初始值設定項必須是選擇查詢表達式」。
我需要財產以後類似下面的SQL但RavenDb：
select pro.ProductName, ord.OrderNumber from orders ord
inner join items itm on itm.OrderId = ord.Id
inner join products pro on pro.Id = itm.ProductId
where pro.ProductName like '%Phone%';
如何通過創建一個產品名稱搜索和返回RavenDb列表或訂單？ 即時通訊使用版本3.5（.1）
考慮作爲主要問題搜索「相關實體屬性的實體」。
在此先感謝！