DocumentClient.ReadDatabaseAsync Method
Definition
Important
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Overloads
| ReadDatabaseAsync(String, RequestOptions) |
Reads a Database from the Azure Cosmos DB service as an asynchronous operation. |
| ReadDatabaseAsync(Uri, RequestOptions) |
Reads a Database as an asynchronous operation from the Azure Cosmos DB service. |
ReadDatabaseAsync(String, RequestOptions)
Reads a Database from the Azure Cosmos DB service as an asynchronous operation.
public System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.Database>> ReadDatabaseAsync (string databaseLink, Microsoft.Azure.Documents.Client.RequestOptions options = default);abstract member ReadDatabaseAsync : string * Microsoft.Azure.Documents.Client.RequestOptions -> System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.Database>>
override this.ReadDatabaseAsync : string * Microsoft.Azure.Documents.Client.RequestOptions -> System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.Database>>Public Function ReadDatabaseAsync (databaseLink As String, Optional options As RequestOptions = Nothing) As Task(Of ResourceResponse(Of Database))Parameters
- databaseLink
- String
The link of the Database resource to be read.
- options
- RequestOptions
(Optional) The request options for the request.
Returns
A System.Threading.Tasks containing a ResourceResponse<TResource> which wraps a Database containing the read resource record.
Implements
Exceptions
If databaseLink is not set.
This exception can encapsulate many different types of errors. To determine the specific error always look at the StatusCode property. Some common codes you may get when creating a Document are:
| StatusCode | Reason for exception |
|---|---|
| 404 | NotFound - This means the resource you tried to read did not exist. |
| 429 | TooManyRequests - This means you have exceeded the number of request units per second. Consult the DocumentClientException.RetryAfter value to see how long you should wait before retrying this operation. |
Examples
//Reads a Database resource where
// - database_id is the ID property of the Database resource you wish to read.
var dbLink = "/dbs/database_id";
Database database = await client.ReadDatabaseAsync(dbLink);
Remarks
Doing a read of a resource is the most efficient way to get a resource from the Database. If you know the resource's ID, do a read instead of a query by ID.
The example shown uses ID-based links, where the link is composed of the ID properties used when the resources were created. You can still use the SelfLink property of the Database if you prefer. A self-link is a URI for a resource that is made up of Resource Identifiers (or the _rid properties). ID-based links and SelfLink will both work. The format for databaseLink is always "/dbs/{db identifier}" only the values within the {} change depending on which method you wish to use to address the resource.
See also
Applies to
ReadDatabaseAsync(Uri, RequestOptions)
Reads a Database as an asynchronous operation from the Azure Cosmos DB service.
public System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.Database>> ReadDatabaseAsync (Uri databaseUri, Microsoft.Azure.Documents.Client.RequestOptions options = default);abstract member ReadDatabaseAsync : Uri * Microsoft.Azure.Documents.Client.RequestOptions -> System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.Database>>
override this.ReadDatabaseAsync : Uri * Microsoft.Azure.Documents.Client.RequestOptions -> System.Threading.Tasks.Task<Microsoft.Azure.Documents.Client.ResourceResponse<Microsoft.Azure.Documents.Database>>Public Function ReadDatabaseAsync (databaseUri As Uri, Optional options As RequestOptions = Nothing) As Task(Of ResourceResponse(Of Database))Parameters
- databaseUri
- Uri
A URI to the Database resource to be read.
- options
- RequestOptions
The request options for the request.
Returns
A System.Threading.Tasks containing a ResourceResponse<TResource> which wraps a Database containing the read resource record.
Implements
Exceptions
If databaseUri is not set.
This exception can encapsulate many different types of errors. To determine the specific error always look at the StatusCode property. Some common codes you may get when creating a Document are:
| StatusCode | Reason for exception |
|---|---|
| 404 | NotFound - This means the resource you tried to read did not exist. |
| 429 | TooManyRequests - This means you have exceeded the number of request units per second. Consult the DocumentClientException.RetryAfter value to see how long you should wait before retrying this operation. |
Examples
//Reads a Database resource where
// - db_id is the ID property of the Database you wish to read.
var dbLink = UriFactory.CreateDatabaseUri("db_id");
Database database = await client.ReadDatabaseAsync(dbLink);
Remarks
Doing a read of a resource is the most efficient way to get a resource from the service. If you know the resource's ID, do a read instead of a query by ID.
See also
Applies to
Azure SDK for .NET