Random numbers¶. The secrets module provides access to the most secure source of randomness that your operating system provides. Class secrets.SystemRandom¶. A class for generating random numbers using the highest-quality sources provided by the operating system.
Unique keys add a layer of data integrity to an Azure Cosmos container. You create a unique key policy when you create an Azure Cosmos container. With unique keys, you make sure that one or more values within a logical partition is unique. You also can guarantee uniqueness per partition key.
After you create a container with a unique key policy, the creation of a new or an update of an existing item resulting in a duplicate within a logical partition is prevented, as specified by the unique key constraint. The partition key combined with the unique key guarantees the uniqueness of an item within the scope of the container.
For example, consider an Azure Cosmos container with email address as the unique key constraint and
CompanyID as the partition key. When you configure the user's email address with a unique key, each item has a unique email address within a given CompanyID . Two items can't be created with duplicate email addresses and with the same partition key value.
To create items with the same email address, but not the same first name, last name, and email address, add more paths to the unique key policy. Instead of creating a unique key based on the email address only, you also can create a unique key with a combination of the first name, last name, and email address. This key is known as a composite unique key. In this case, each unique combination of the three values within a given
CompanyID is allowed.
For example, the container can contain items with the following values, where each item honors the unique key constraint.
Python Create Unique Id
Python Generate Unique Id
If you attempt to insert another item with the combinations listed in the previous table, you receive an error. The error indicates that the unique key constraint wasn't met. You receive either
Resource with specified ID or name already exists or Resource with specified ID, name, or unique index already exists as a return message.
Define a unique key
You can define unique keys only when you create an Azure Cosmos container. A unique key is scoped to a logical partition. In the previous example, if you partition the container based on the ZIP code, you end up with duplicated items in each logical partition. Consider the following properties when you create unique keys:
![]() Next stepsPython Generate A Unique Character Keyboard
Comments are closed.
|
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
December 2020
Categories |