Quickstart: Build a Table API app with .NET and Azure Cosmos DB
This quickstart shows how to use .NET and the Azure Cosmos DB Table API to build an app by cloning an example from GitHub. This quickstart also shows you how to create an Azure Cosmos DB account and how to use Data Explorer to create tables and entities in the web-based Azure portal.
Azure Cosmos DB is Microsoft’s globally distributed multi-model database service. You can quickly create and query document, key/value, and graph databases, all of which benefit from the global distribution and horizontal scale capabilities at the core of Azure Cosmos DB.
If you don’t already have Visual Studio 2017 installed, you can download and use the free Visual Studio 2017 Community Edition. Make sure that you enable Azure development during the Visual Studio setup.
If you don't have an Azure subscription, create a free account before you begin.
Create a database account
You need to create a new Table API account to work with the generally available Table API SDKs. Table API accounts created during preview are not supported by the generally available SDKs.
- In a new browser window, sign in to the Azure portal.
In the left menu, click New, click Databases, and then under Azure Cosmos DB, click Create.
In the New account page, enter the settings for the new Azure Cosmos DB account.
Setting Suggested value Description ID Enter a unique name Enter a unique name to identify this Azure Cosmos DB account. Because documents.azure.com is appended to the ID that you provide to create your URI, use a unique but identifiable ID.
The ID can contain only lowercase letters, numbers, and the hyphen (-) character, and it must contain 3 to 50 characters.
API Azure Table The API determines the type of account to create. Azure Cosmos DB provides five APIs to suits the needs of your application: SQL (document database), Gremlin (graph database), MongoDB (document database), Azure Table, and Cassandra, each which currently require a separate account.
Select Azure Table because in this quickstart you are creating a table that works with the Table API.
Learn more about the Table API
Subscription Enter the same unique name as provided above in ID Select Azure subscription that you want to use for this Azure Cosmos DB account. Resource Group The same value as ID Enter a new resource-group name for your account. For simplicity, you can use the same name as your ID. Location Select the region closest to your users Select geographic location in which to host your Azure Cosmos DB account. Use the location that's closest to your users to give them the fastest access to the data. Enable geo-redundancy Leave blank This creates a replicated version of your database in a second (paired) region. Leave this blank. Pin to dashboard Select Select this box so that your new database account is added to your portal dashboard for easy access.
Then click Create.
The account creation takes a few minutes. During account creation the portal displays the Deploying Azure Cosmos DB tile.
Once the account is created, the Congratulations! Your Azure Cosmos DB account was created page is displayed.
Add a table
You can now use the Data Explorer tool in the Azure portal to create a database and table.
Click Data Explorer > New Table.
The Add Table area is displayed on the far right, you may need to scroll right to see it.
In the Add Table page, enter the settings for the new table.
Setting Suggested value Description Table Id sample-table The ID for your new table. Table names have the same character requirements as database ids. Database names must be between 1 and 255 characters, and cannot contain
/ \ # ?or a trailing space.
Storage capacity Fixed (10 GB) Change the value to Fixed (10 GB). This value is the storage capacity of the database. Throughput 400 RUs Change the throughput to 400 request units per second (RU/s). If you want to reduce latency, you can scale up the throughput later.
Data Explorer displays the new database and table.
Add sample data
You can now add data to your new table using Data Explorer.
In Data Explorer, expand sample-table, click Entities, and then click Add Entity.
Now add data to the PartitionKey value box and RowKey value boxes, and click Add Entity.
You can now add more entities to your table, edit your entities, or query your data in Data Explorer. Data Explorer is also where you can scale your throughput and add stored procedures, user defined functions, and triggers to your table.
Clone the sample application
Now let's clone a Table app from github, set the connection string, and run it. You'll see how easy it is to work with data programmatically.
Open a git terminal window, such as git bash, and use the
cdcommand to change to a folder to install the sample app.
Run the following command to clone the sample repository. This command creates a copy of the sample app on your computer.
git clone https://github.com/Azure-Samples/storage-table-dotnet-getting-started.git
Then open the TableStorage solution file in Visual Studio.
Update your connection string
Now go back to the Azure portal to get your connection string information and copy it into the app. This enables your app to communicate with your hosted database.
In the Azure portal, click Connection String.
Use the copy buttons on the right side of the screen to copy the PRIMARY CONNECTION STRING.
In Visual Studio, open the App.config file.
Uncomment the StorageConnectionString on line 8 and comment out the StorageConnectionString on line 7 as this tutorial does not use the Storage Emulator. Line 7 and 8 should now look like this:
<!--key="StorageConnectionString" value="UseDevelopmentStorage=true;" />--> <add key="StorageConnectionString" value="DefaultEndpointsProtocol=https;AccountName=[AccountName];AccountKey=[AccountKey]" />
Paste the PRIMARY CONNECTION STRING from the portal into the StorageConnectionString value on line 8. Paste the string inside the quotes.
If your Endpoint uses documents.azure.com, that means you have a preview account, and you need to create a new Table API account to work with the generally available Table API SDK.
Line 8 should now look similar to:
<add key="StorageConnectionString" value="DefaultEndpointsProtocol=https;AccountName=<account name>;AccountKey=txZACN9f...==;TableEndpoint=https://<account name>.table.cosmosdb.azure.com;" />
Save the App.config file.
You've now updated your app with all the info it needs to communicate with Azure Cosmos DB.
Build and deploy the app
In Visual Studio, right-click on the TableStorage project in Solution Explorer and then click Manage NuGet Packages.
In the NuGet Browse box, type Microsoft.Azure.CosmosDB.Table.
From the results, install the Microsoft.Azure.CosmosDB.Table library. This installs the Azure Cosmos DB Table API package as well as all dependencies.
Open BasicSamples.cs and add a breakpoint to line 30 and line 52.
Click CTRL + F5 to run the application.
The console window displays the table data being added to the new table database in Azure Cosmos DB.
If you get an error about dependencies, see Troubleshooting.
When you hit the first breakpoint, go back to Data Explorer in the Azure portal and expand the demo* table and click Entities. The Entities tab on the right shows the new entity that was added, note that phone number for the user is 425-555-0101.
Close the Entities tab in Data Explorer.
Continue to run the app to the next breakpoint.
When you hit the breakpoint, switch back to the portal, click Entities again to open the Entities tab, and note that the phone number has been updated to 425-555-0105.
Back in the console window, press CTRL + C to end the execution of the app.
You can now go back to Data Explorer and add or modify the entitites, and query the data.
Review SLAs in the Azure portal
The throughput, storage, availability, latency, and consistency of the resources in your account are monitored in the Azure portal. Let's take a quick look at these metrics.
Click Metrics in the navigation menu.
Click through each of the tabs so you're aware of the metrics Azure Cosmos DB provides.
Each chart that's associated with the Azure Cosmos DB Service Level Agreements (SLAs) provides a line that shows if any of the SLAs have been violated. Azure Cosmos DB makes monitoring your SLAs transparent with this suite of metrics.
Clean up resources
If you're not going to continue to use this app, delete all resources created by this quickstart with the following steps so you don't incur any charges:
In the Azure portal, select Resource groups on the far left.
From the list of resource groups, select the resource group you created, and then click Delete resource group.
Type the name of the resource group to delete, and then click Delete.
In this quickstart, you've learned how to create an Azure Cosmos DB account, create a table using the Data Explorer, and run an app. Now you can query your data using the Table API.