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<title>Using Batch support in Google Base</title>
<h1>The batch support</h1>
<p>Release 1.0.5 includes support for the GoogleBatch protocol extensions. Refer to
the code.google.com documentation for details on this in general. </p>
<p>
In the C# libraries this is implemented as basic support on the AtomFeed and AtomEntry.
Those objects have a new member, called BatchData. Setting this data controls the
operations executed on the batchfeed, and this object also holds the return values
for from the server. </p>
<p>
To create a feed useful to talk to the batch service, you need to know the service URI
for this. Here is a code snippet that retrieves that URI.</p>
<code>
FeedQuery query = new FeedQuery();<br>
Service service = new Service("gbase", "mytestapplication"); <br>
NetworkCredential nc = new NetworkCredential(userName, passWord); <br>
service.Credentials = nc;<br>
// setup the google web key<br>
GDataGAuthRequestFactory authFactory = service.RequestFactor as GDataGAuthRequestFactory; <br>
authFactory.GoogleWebKey = "yourkey"; <br>
query.Uri = new Uri("http://base.google.com/base/feeds/items");<br>
AtomFeed baseFeed = service.Query(query);<br>
// this should have a batch URI <br>
if (baseFeed.Batch != null) {<br>
....
</code>
<p>
Note, that to talk to GoogleBase, you also need a web developer key, you can see above
that, once you have that key, you only need to set the GoogleWebKey property on the service
to use it.
<p>
Now to set the default operation you want the batchfeed to do, you use code similiar to this:</p>
<code>
<br> batchFeed.BatchData = new GDataBatchFeedData();
<br> batchFeed.BatchData.Type = GDataBatchOperationType.delete;
</code>
<p>If you do not set this, the feed will default to insert as it's operation type.
<p>You would then go and add entries to your feed. If you want the entry to behave differently
than the feed itself, you set the BatchData object on the entry. </p>
<code>
<br> entry.BatchData = new GDataBatchEntryData();
<br> entry.BatchData.Type = GDataBatchOperationType.insert;
<br> entry.BatchData.Id = "some id";
</code>
<p>
To finally do the batch, you just call the new service method for this purpose:
</p>
<code>
<br>AtomFeed resultFeed = service.Batch(batchFeed, new Uri(baseFeed.Batch));
</code>
<p>
To verify that the operations were successfull, you need to iterate over the returned entries:
</p>
<code>
<br> foreach (AtomEntry resultEntry in resultFeed.Entries )
<br> {
<br> GDataBatchEntryData data = resultEntry.BatchData;
<br> switch (data.Stutus.Code) {
<br> case 200:....
<br> }
<br> }
</code>
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