Dynamics CRM 2015/2016/365 Web API：批处理任务

Web API为我们提供的批量任务执行功能，我们可以在一个请求中混合多个不相干的创建查询请求，并且其还提供了事务功能，如果在事务中如果有脚本出现了错误，则其提供回滚功能。

如下是批处理的请求报文，在报文里面我们需要设置批处理任务的编号，因为我们需要用它来划分任务的开始和结束边界。另外，我们还可以通过changeset标记来划分事务，在同一个changeset中，如果有处理失败了，那么整个changeset都会被回滚。

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Accept: application/json
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OData-Version: 4.0
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Host: crmhomedev06.api.crm6.dynamics.com
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--batch_AAA123
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 --changeset_BBB456
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 POST https://crmhomedev06.crm6.dynamics.com/api/data/v8.2/tasks HTTP/1.1
 Content-Type: application/json;type=entry

 {'subject':'Task 1 in batch','[email protected]':'https://crmhomedev06.crm6.dynamics.com/api/data/v8.2/accounts(5df6e552-bca5-e611-8100-1458d05b1178)'}
--changeset_BBB456
Content-Type: application/http
Content-Transfer-Encoding:binary
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 POST https://crmhomedev06.crm6.dynamics.com/api/data/v8.2/tasks HTTP/1.1
Content-Type: application/json;type=entry

 {'subject':'Task 2 in batch','[email protected]':'https://crmhomedev06.crm6.dynamics.com/api/data/v8.2/accounts(5df6e552-bca5-e611-8100-1458d05b1178)'}
-changeset_BBB456--

--batch_AAA123
Content-Type: application/http
Content-Transfer-Encoding:binary
GET https://crmhomedev06.crm6.dynamics.com/api/data/v8.2/accounts HTTP/1.1
Accept: application/json

--batch_AAA123--

批处理任务响应报文

HTTP/1.1 200 OK
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Date: Thu, 17 Nov 2016 06:43:15 GMT
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--changesetresponse_10c4be12-1f1e-4d5a-9cbf-51bb6c390615
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HTTP/1.1 200 OK
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使用这种方式批量执行脚本的缺陷是我们需要自己去解析返回的报文，这可能需要我们花费不少功夫。