Execute batch operations using the Web API

Статья
02/28/2017

Applies To: Dynamics 365 (online), Dynamics 365 (on-premises), Dynamics CRM 2016, Dynamics CRM Online

You can group multiple operations into a single HTTP request using a batch operation.

In this topic

When to use batch requests

Batch requests

Change sets

Example

When to use batch requests

The value that batch requests provide is that they can include change sets, which provide a way to bundle a number of operations that either succeed or fail as a group. in a transaction Compared to other operations that can be performed using the web API, they are more difficult to compose without some object model that includes serialization of objects or a deeper understanding of the HTTP protocol because the request body is essentially a text document that must match very specific requirements.

Remember that associated entities can be created in a single operation more easily than using a batch request. Batch requests are best used when performing operations on entities that aren’t associated with each other when all the operations must be performed in a single transactional operation.

Also, the responses returned are essentially text documents rather than objects that can easily be parsed into JSON. You’ll need to parse the text in the response or locate a helper library to access the data in the response.

Batch requests

Use a POST request to submit a batch operation that contains multiple requests. A batch request can include GET requests and change sets. To use the transactional capabilities of batch requests, only operations that will change data can be included within a change set. GET requests must not be included in the change set.

The POST request containing the batch must have a Content-Type header with a value set to multipart/mixed with a boundary set to include the identifier of the batch using this pattern:

--batch_<unique identifier>

The unique identifier doesn’t need to be a GUID, but should be unique. Each item within the batch must be preceded by the batch identifier with a Content-Type and Content-Transfer-Encoding header like the following:

--batch_WKQS9Yui9r
Content-Type: application/http
Content-Transfer-Encoding:binary

The end of the batch must contain a termination indicator like the following:

--batch_WKQS9Yui9r--

Note

The odata.continue-on-error preference is not supported by the web API. Any error that occurs in the batch will stop the processing of the remainder of the batch.

Change sets

When multiple operations are contained in a change set, all the operations are considered atomic, which means that if any one of the operations fail, any completed operations will be rolled back. Like a batch request, change sets must have a Content-Type header with value set to multipart/mixed with a boundary set to include the identifier of the change set using this pattern:

--changeset_<unique identifier>

The unique identifier doesn’t need to be a GUID, but should be unique. Each item within the change set must be preceded by the change set identifier with a Content-Type and Content-Transfer-Encoding header like the following:

--changeset_BBB456
Content-Type: application/http
Content-Transfer-Encoding:binary

Change sets can also include a Content-ID header with a unique value. This value, when prefixed with $, represents a variable that contains the Uri for any entity created in that operation. For example, when you set the value of 1, you can refer to that entity using $1 later in your change set.

The end of the change set must contain a termination indicator like the following:

--changeset_BBB456--

Example

The following example includes a batch with a unique identifier of AAA123 and a change set with a unique identifier of BBB456.

Within the change set, two tasks are created using POST and associated with an existing account with accountid = 00000000-0000-0000-000000000001.

Finally, a GET request is included outside the change set to return all six tasks associated with the account, including the two that were created in the batch request.

Request

POST [Organization URI]/api/data/v8.2/$batch HTTP/1.1
Content-Type: multipart/mixed;boundary=batch_AAA123
Accept: application/json
OData-MaxVersion: 4.0
OData-Version: 4.0

--batch_AAA123
Content-Type: multipart/mixed;boundary=changeset_BBB456

--changeset_BBB456
Content-Type: application/http
Content-Transfer-Encoding:binary
Content-ID: 1

POST [Organization URI]/api/data/v8.2/tasks HTTP/1.1
Content-Type: application/json;type=entry

{"subject":"Task 1 in batch","regardingobjectid_account_task@odata.bind":"[Organization URI]/api/data/v8.2/accounts(00000000-0000-0000-000000000001)"}
--changeset_BBB456
Content-Type: application/http
Content-Transfer-Encoding:binary
Content-ID: 2

POST [Organization URI]/api/data/v8.2/tasks HTTP/1.1
Content-Type: application/json;type=entry

{"subject":"Task 2 in batch","regardingobjectid_account_task@odata.bind":"[Organization URI]/api/data/v8.2/accounts(00000000-0000-0000-000000000001)"}
--changeset_BBB456--

--batch_AAA123
Content-Type: application/http
Content-Transfer-Encoding:binary

GET [Organization URI]/api/data/v8.2/accounts(00000000-0000-0000-000000000001)/Account_Tasks?$select=subject HTTP/1.1
Accept: application/json

--batch_AAA123--

Response

--batchresponse_c1bd45c1-dd81-470d-b897-e965846aad2f
Content-Type: multipart/mixed; boundary=changesetresponse_ff83b4f1-ab48-430c-b81c-926a2c596abc

--changesetresponse_ff83b4f1-ab48-430c-b81c-926a2c596abc
Content-Type: application/http
Content-Transfer-Encoding: binary
Content-ID: 1

HTTP/1.1 204 No Content
OData-Version: 4.0
Location: [Organization URI]/api/data/v8.2/tasks(a59c24f3-fafc-e411-80dd-00155d2a68cb)
OData-EntityId: [Organization URI]/api/data/v8.2/tasks(a59c24f3-fafc-e411-80dd-00155d2a68cb)


--changesetresponse_ff83b4f1-ab48-430c-b81c-926a2c596abc
Content-Type: application/http
Content-Transfer-Encoding: binary
Content-ID: 2

HTTP/1.1 204 No Content
OData-Version: 4.0
Location: [Organization URI]/api/data/v8.2/tasks(a69c24f3-fafc-e411-80dd-00155d2a68cb)
OData-EntityId: [Organization URI]/api/data/v8.2/tasks(a69c24f3-fafc-e411-80dd-00155d2a68cb)


--changesetresponse_ff83b4f1-ab48-430c-b81c-926a2c596abc--
--batchresponse_c1bd45c1-dd81-470d-b897-e965846aad2f
Content-Type: application/http
Content-Transfer-Encoding: binary

HTTP/1.1 200 OK
Content-Type: application/json; odata.metadata=minimal
OData-Version: 4.0

{
  "@odata.context":"[Organization URI]/api/data/v8.2/$metadata#tasks(subject)","value":[
    {
      "@odata.etag":"W/\"474122\"","subject":"Task Created with Test Account","activityid":"919c24f3-fafc-e411-80dd-00155d2a68cb"
    },{
      "@odata.etag":"W/\"474125\"","subject":"Task 1","activityid":"a29c24f3-fafc-e411-80dd-00155d2a68cb"
    },{
      "@odata.etag":"W/\"474128\"","subject":"Task 2","activityid":"a39c24f3-fafc-e411-80dd-00155d2a68cb"
    },{
      "@odata.etag":"W/\"474131\"","subject":"Task 3","activityid":"a49c24f3-fafc-e411-80dd-00155d2a68cb"
    },{
      "@odata.etag":"W/\"474134\"","subject":"Task 1 in batch","activityid":"a59c24f3-fafc-e411-80dd-00155d2a68cb"
    },{
      "@odata.etag":"W/\"474137\"","subject":"Task 2 in batch","activityid":"a69c24f3-fafc-e411-80dd-00155d2a68cb"
    }
  ]
}
--batchresponse_c1bd45c1-dd81-470d-b897-e965846aad2f--

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Execute batch operations using the Web API

In this topic

When to use batch requests

Batch requests

Change sets

Example

See Also

Дополнительные ресурсы