我正在遵循微软的这篇博客文章测试DocumentDB：https://azure.microsoft.com/tr-tr/documentation/articles/documentdb-dotnet-application/
我已经创建了一个集合，并通过应用程序中的不同POCO类插入了2个文档。它创建了这些文档，但我无法将它们过滤回它们各自的POCO类中。我意识到我正在查询整个集合，所以显然会检索该集合中存储的所有文档。
有什么最好的方法来区分查询中的文档，以便我可以按类型单独查询它们？
我可以在文档中添加一个类型字段，并通过WHERE type="user"进行获取，但我不确定是否可以使用SELECT * FROM users，其中users是DocumentDB中的文档类型（如果存在的话），而不是集合。
以下是我的文档创建方式：
var user1= new User()
{
UserTypeId = 0,
UserName = "user1@hotmail.com",
Password = "12345",
PasswordSalt = "saltyPassword",
UserStatusId = 1,
ProfilePhotoKey = "KJSY"
};
await DocumentDBRepository<User>.CreateItemAsync(user1);
var client = new Client()
{
ClientName = "client1",
Secret = "rxPBsIVYya2Jg2ZHPNG8gL0P36TnutiBehvEFgk938M=",
Title = "Administration Front End Application",
ApplicationTypeId = 0,
Active = false,
RefreshTokenLifeTime = 60,
AllowedOrigin = "http://localhost:8080",
AllowedRoles = "admin"
};
await DocumentDBRepository<Client>.CreateItemAsync(client);
文档数据库存储库类
public static class DocumentDBRepository<T>
{
//Use the Database if it exists, if not create a new Database
private static Database ReadOrCreateDatabase()
{
var db = Client.CreateDatabaseQuery()
.Where(d => d.Id == DatabaseId)
.AsEnumerable()
.FirstOrDefault();
if (db == null)
{
db = Client.CreateDatabaseAsync(new Database { Id = DatabaseId }).Result;
}
return db;
}
//Use the DocumentCollection if it exists, if not create a new Collection
private static DocumentCollection ReadOrCreateCollection(string databaseLink)
{
var col = Client.CreateDocumentCollectionQuery(databaseLink)
.Where(c => c.Id == CollectionId)
.AsEnumerable()
.FirstOrDefault();
if (col == null)
{
var collectionSpec = new DocumentCollection { Id = CollectionId };
var requestOptions = new RequestOptions { OfferType = "S1" };
col = Client.CreateDocumentCollectionAsync(databaseLink, collectionSpec, requestOptions).Result;
}
return col;
}
//Expose the "database" value from configuration as a property for internal use
private static string databaseId;
private static String DatabaseId
{
get
{
if (string.IsNullOrEmpty(databaseId))
{
databaseId = ConfigurationManager.AppSettings["database"];
}
return databaseId;
}
}
//Expose the "collection" value from configuration as a property for internal use
private static string collectionId;
private static String CollectionId
{
get
{
if (string.IsNullOrEmpty(collectionId))
{
collectionId = ConfigurationManager.AppSettings["collection"];
}
return collectionId;
}
}
//Use the ReadOrCreateDatabase function to get a reference to the database.
private static Database database;
private static Database Database
{
get
{
if (database == null)
{
database = ReadOrCreateDatabase();
}
return database;
}
}
//Use the ReadOrCreateCollection function to get a reference to the collection.
private static DocumentCollection collection;
private static DocumentCollection Collection
{
get
{
if (collection == null)
{
collection = ReadOrCreateCollection(Database.SelfLink);
}
return collection;
}
}
//This property establishes a new connection to DocumentDB the first time it is used,
//and then reuses this instance for the duration of the application avoiding the
//overhead of instantiating a new instance of DocumentClient with each request
private static DocumentClient client;
private static DocumentClient Client
{
get
{
// change policy to ConnectionMode: Direct and ConnectionProtocol: TCP on publishing to AZURE
if (client == null)
{
string endpoint = ConfigurationManager.AppSettings["endpoint"];
string authKey = ConfigurationManager.AppSettings["authKey"];
Uri endpointUri = new Uri(endpoint);
client = new DocumentClient(endpointUri, authKey);
}
return client;
}
}
/* QUERY HELPERS */
public static IEnumerable<T> GetAllItems()
{
return Client.CreateDocumentQuery<T>(Collection.DocumentsLink)
.AsEnumerable();
}
public static IEnumerable<T> GetItems(Expression<Func<T, bool>> predicate)
{
return Client.CreateDocumentQuery<T>(Collection.DocumentsLink)
.Where(predicate)
.AsEnumerable();
}
public static async Task<Document> CreateItemAsync(T item)
{
return await Client.CreateDocumentAsync(Collection.SelfLink, item);
}
public static T GetItem(Expression<Func<T, bool>> predicate)
{
return Client.CreateDocumentQuery<T>(Collection.DocumentsLink)
.Where(predicate)
.AsEnumerable()
.FirstOrDefault();
}
public static async Task<Document> UpdateItemAsync(string id, T item)
{
Document doc = GetDocument(id);
return await Client.ReplaceDocumentAsync(doc.SelfLink, item);
}
private static Document GetDocument(string id)
{
return Client.CreateDocumentQuery(Collection.DocumentsLink)
.Where(d => d.Id == id)
.AsEnumerable()
.FirstOrDefault();
}
}
我想要实现以下目标：
var q = DocumentDBRepository<User>.GetAllItems().ToList();
var t = DocumentDBRepository<Client>.GetAllItems().ToList();
q应该只包含由用户创建的文档
await DocumentDBRepository<User>.CreateItemAsync(user1);
并且t应只包含由客户端创建的文档
await DocumentDBRepository<Client>.CreateItemAsync(client1);