作为 cosmos db 中不支持的查询

Question

我正在尝试按照代码获取详细信息，但它没有返回我想要的。

我的查询：

 var query = $"SELECT catalog.id as vendorguid,catalog.VendorName,industry.Id as industryguid,industry.IdustryId,industry.IdustryName,category.id as categoryguid,category.Name as categoryname,category.Description as categorydescription,Subcategory.Id as subcategoryguid,Subcategory.Name as subcategoryname,Subcategory.Description as subcategorydescription,product.Id as productguid,product.Name as productname,product.CurrentQuantity as productCurrentQuantity,product.Tag as productTag,product.ImageUrl as productImageUrl,product.Unit as productUnit,product.Price as productPrice,product.hasMethodOfPreparation as producthasMethodOfPreparation,product.MethodOfPreparation as productMethodOfPreparation,product.Addons as productAddons FROM catalogjoin industry in catalog.Industy join category in industry.Category join Subcategory in category.Subcategoryjoin product in Subcategory.Product where product.Id = '"+productId+"'";

我的服务 class：

output：

 { "id": "d91af3e6-6aae-4d10-9ba6-6b97ca4cd881", "vendorName": "string", "industy": [] }

预期 output：

 { "vendorguid": "97392a23-c8c4-4a7f-bffb-7c3807cc40de", "VendorName": "string", "industryguid": "f8265ee6-a351-4036-a0ee-10ec4f51ecf4", "IdustryId": 0, "IdustryName": "string", "categoryguid": "ce7edfdf-1608-4a8c-ae38-7ca60c43bc30", "categoryname": "string", "categorydescription": "string", "subcategoryguid": "709f4e6f-1bba-421f-8dc0-7cf067cbc032", "subcategoryname": "string", "subcategorydescription": "string", "productguid": "d24dd340-d7a2-42e5-b84a-1ee72d9840c6", "productname": "string", "productCurrentQuantity": 0, "productTag": "string", "productImageUrl": [ "string" ], "productUnit": 0, "productPrice": 0, "producthasMethodOfPreparation": true, "productMethodOfPreparation": [ ], "productAddons": [ ] }

我怎样才能得到它有人帮助我吗？

Answer 1

我认为问题在于您的加入（类别，子类别）。 你确定它总能找到匹配吗？ 如果未找到匹配项或没有该属性，CosmosDb 将不会将其包含在结果集中。

它不像包含空值的 MSSQL 的左连接。 CosmosDb 更像是一个完全外连接（交叉连接）。