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CosmosClient Class

  • Reference

A client-side logical representation of an Azure Cosmos DB account.

Use this client to configure and execute requests to the Azure Cosmos DB service.

It's recommended to maintain a single instance of CosmosClient per lifetime of the application which enables efficient connection management and performance.

CosmosClient initialization is a heavy operation - don't use initialization CosmosClient instances as credentials or network connectivity validations.

Instantiate a new CosmosClient.

Inheritance
builtins.object
CosmosClient

Constructor

CosmosClient(url: str, credential: str | Dict[str, str] | AsyncTokenCredential, *, consistency_level: str | None = None, **kwargs: Any)

Parameters

Name Description
url
Required
str

The URL of the Cosmos DB account.
credential
Required
Union[str, Dict[str, str], AsyncTokenCredential]

Can be the account key, or a dictionary of resource tokens.

Keyword-Only Parameters

Name Description
consistency_level
str

Consistency level to use for the session. Default value is None (account-level). More on consistency levels and possible values: https://aka.ms/cosmos-consistency-levels
timeout
int

An absolute timeout in seconds, for the combined HTTP request and response processing.
connection_timeout
int

The HTTP request timeout in seconds.
connection_mode
str

The connection mode for the client - currently only supports 'Gateway'.
proxy_config
ProxyConfiguration

Connection proxy configuration.
ssl_config
SSLConfiguration

Connection SSL configuration.
connection_verify
bool

Whether to verify the connection, default value is True.
connection_cert
str

An alternative certificate to verify the connection.
retry_total
int

Maximum retry attempts.
retry_backoff_max
int

Maximum retry wait time in seconds.
retry_fixed_interval
int

Fixed retry interval in milliseconds.
retry_read
int

Maximum number of socket read retry attempts.
retry_connect
int

Maximum number of connection error retry attempts.
retry_status
int

Maximum number of retry attempts on error status codes.
retry_on_status_codes
list[int]

A list of specific status codes to retry on.
retry_backoff_factor
float

Factor to calculate wait time between retry attempts.
enable_endpoint_discovery
bool

Enable endpoint discovery for geo-replicated database accounts. (Default: True)
preferred_locations
list[str]

The preferred locations for geo-replicated database accounts.
enable_diagnostics_logging
bool

Enable the CosmosHttpLogging policy. Must be used along with a logger to work.
logger
Logger

Logger to be used for collecting request diagnostics. Can be passed in at client level (to log all requests) or at a single request level. Requests will be logged at INFO level.
no_response_on_write
bool

Indicates whether service should be instructed to skip sending response payloads for write operations on items by default unless specified differently per operation.

Examples

Create a new instance of the Cosmos DB client:


       async with CosmosClient(url, key) as client:

Methods

close

Close this instance of CosmosClient.
create_database

Create a new database with the given ID (name).
create_database_if_not_exists

Create the database if it does not exist already.

If the database already exists, the existing settings are returned.

..note:: This function does not check or update existing database settings or offer throughput if they differ from what is passed in.
delete_database

Delete the database with the given ID (name).
from_connection_string

Create a CosmosClient instance from a connection string.

This can be retrieved from the Azure portal.For full list of optional keyword arguments, see the CosmosClient constructor.
get_database_client

Retrieve an existing database with the ID (name) id.
list_databases

List the databases in a Cosmos DB SQL database account.
query_databases

Query the databases in a Cosmos DB SQL database account.

close

Close this instance of CosmosClient.

async close() -> None

create_database

Create a new database with the given ID (name).

async create_database(id: str, *, offer_throughput: int | ThroughputProperties | None = None, session_token: str | None = None, initial_headers: Dict[str, str] | None = None, etag: str | None = None, match_condition: MatchConditions | None = None, **kwargs: Any) -> DatabaseProxy

Parameters

Name Description
id
Required
str

ID (name) of the database to create.

Keyword-Only Parameters

Name Description
offer_throughput
Union[int, ThroughputProperties]

The provisioned throughput for this offer.
session_token
str

Token for use with Session consistency.
initial_headers
dict[str, str]

Initial headers to be sent as part of the request.
etag
str

An ETag value, or the wildcard character (*). Used to check if the resource has changed, and act according to the condition specified by the match_condition parameter.
match_condition
MatchConditions

The match condition to use upon the etag.
response_hook
Callable[[Dict[str, str], Dict[str, Any]], None]

A callable invoked with the response metadata.

Returns

Type Description
DatabaseProxy

A DatabaseProxy instance representing the new database.

Exceptions

Type Description
CosmosResourceExistsError

Database with the given ID already exists.

Examples

Create a database in the Cosmos DB account:


           database_name = "testDatabase"
           try:
               database = await client.create_database(id=database_name)
           except exceptions.CosmosResourceExistsError:
               database = client.get_database_client(database=database_name)

create_database_if_not_exists

Create the database if it does not exist already.

If the database already exists, the existing settings are returned.

..note:: This function does not check or update existing database settings or offer throughput if they differ from what is passed in.

async create_database_if_not_exists(id: str, *, offer_throughput: int | ThroughputProperties | None = None, session_token: str | None = None, initial_headers: Dict[str, str] | None = None, etag: str | None = None, match_condition: MatchConditions | None = None, **kwargs: Any) -> DatabaseProxy

Parameters

Name Description
id
Required
str

ID (name) of the database to read or create.

Keyword-Only Parameters

Name Description
offer_throughput
Union[int, ThroughputProperties]

The provisioned throughput for this offer.
session_token
str

Token for use with Session consistency.
initial_headers
dict[str, str]

Initial headers to be sent as part of the request.
etag
str

An ETag value, or the wildcard character (*). Used to check if the resource has changed, and act according to the condition specified by the match_condition parameter.
match_condition
MatchConditions

The match condition to use upon the etag.
response_hook
Callable[[Dict[str, str], Dict[str, Any]], None]

A callable invoked with the response metadata.

Returns

Type Description
DatabaseProxy

A DatabaseProxy instance representing the database.

Exceptions

Type Description
CosmosHttpResponseError

The database read or creation failed.

delete_database

Delete the database with the given ID (name).

async delete_database(database: str | DatabaseProxy | Dict[str, Any], *, session_token: str | None = None, initial_headers: Dict[str, str] | None = None, etag: str | None = None, match_condition: MatchConditions | None = None, **kwargs: Any) -> None

Parameters

Name Description
database
Required
Union[str, DatabaseProxy, Dict[str, Any]]

The ID (name), dict representing the properties, or DatabaseProxy instance of the database to delete.

Keyword-Only Parameters

Name Description
session_token
str

Token for use with Session consistency.
initial_headers
dict[str, str]

Initial headers to be sent as part of the request.
etag
str

An ETag value, or the wildcard character (*). Used to check if the resource has changed, and act according to the condition specified by the match_condition parameter.
match_condition
MatchConditions

The match condition to use upon the etag.
response_hook
Callable[[Dict[str, str]], None]

A callable invoked with the response metadata.

Returns

Type Description
None

Exceptions

Type Description
CosmosHttpResponseError

If the database couldn't be deleted.

from_connection_string

Create a CosmosClient instance from a connection string.

This can be retrieved from the Azure portal.For full list of optional keyword arguments, see the CosmosClient constructor.

from_connection_string(conn_str: str, *, credential: str | Dict[str, str] | None = None, consistency_level: str | None = None, **kwargs: Any) -> CosmosClient

Parameters

Name Description
conn_str
Required
str

The connection string.

Keyword-Only Parameters

Name Description
credential
Union[str, Dict[str, str]]

Alternative credentials to use instead of the key provided in the connection string.
consistency_level
str

Consistency level to use for the session. Default value is None (account-level). More on consistency levels and possible values: https://aka.ms/cosmos-consistency-levels

Returns

Type Description
CosmosClient

a CosmosClient instance

get_database_client

Retrieve an existing database with the ID (name) id.

get_database_client(database: str | DatabaseProxy | Dict[str, Any]) -> DatabaseProxy

Parameters

Name Description
database
Required
Union[str, DatabaseProxy, Dict[str, Any]]

The ID (name), dict representing the properties, or DatabaseProxy instance of the database to get.

Returns

Type Description
DatabaseProxy

A DatabaseProxy instance representing the retrieved database.

list_databases

List the databases in a Cosmos DB SQL database account.

list_databases(*, max_item_count: int | None = None, session_token: str | None = None, initial_headers: Dict[str, str] | None = None, **kwargs: Any) -> AsyncItemPaged[Dict[str, Any]]

Keyword-Only Parameters

Name Description
max_item_count
int

Max number of items to be returned in the enumeration operation.
session_token
str

Token for use with Session consistency.
initial_headers
dict[str, str]

Initial headers to be sent as part of the request.
response_hook
Callable[[Dict[str, str]], None]

A callable invoked with the response metadata.

Returns

Type Description
<xref:AsyncItemPaged>[Dict[str, str]]

An AsyncItemPaged of database properties (dicts).

query_databases

Query the databases in a Cosmos DB SQL database account.

query_databases(query: str, *, parameters: List[Dict[str, Any]] | None = None, max_item_count: int | None = None, session_token: str | None = None, initial_headers: Dict[str, str] | None = None, **kwargs: Any) -> AsyncItemPaged[Dict[str, Any]]

Parameters

Name Description
query
Required
Union[str, Dict[str, Any]]

The Azure Cosmos DB SQL query to execute.

Keyword-Only Parameters

Name Description
parameters
List[Dict[str, Any]]

Optional array of parameters to the query. Each parameter is a dict() with 'name' and 'value' keys.
max_item_count
int

Max number of items to be returned in the enumeration operation.
session_token
str

Token for use with Session consistency.
initial_headers
dict[str, str]

Initial headers to be sent as part of the request.
response_hook
Callable[[Dict[str, str]], None]

A callable invoked with the response metadata.

Returns

Type Description
<xref:AsyncItemPaged>[Dict[str, str]]

An AsyncItemPaged of database properties (dicts).