Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Are you sure you need to transfer hundreds of thousands of records to client application? How client would view these records? Would these records be pre-processed / aggregated somehow, or just displayed in some grid? If preprocessed - consider doing preprocessing on server side. If just displayed - consider redesigning your interface to include paging:</p> <pre><code>IList&lt;RainRecord&gt; GetList(int startPage, int pageSize); </code></pre> <p>If paging is not an option, but you would still want to retrieve data in batches - you can implement manual batching by introducing state to your service (You would need to know who requested list, at which position you currently at, and how much data left to transfer):</p> <pre><code>public interface IService { Guid BeginGetList(); IList&lt;RainRecord&gt; GetNextBatch(Guid id); } </code></pre> <p>Empty list or null returned by GetNextBatch would indicate end of transfer. In other words, it is the same paging, but implemented using stateful service.</p> <p>Now, if transfering hundreds of thousands of records is absolutely neccessary, and must be done as one call - consider <a href="http://msdn.microsoft.com/en-us/library/ms733742.aspx" rel="nofollow noreferrer">using streaming to transfer your data</a>. But you would need to change your contract, to include Stream with serialized RainRecords.</p> <p>Another alternative would be to <a href="http://msdn.microsoft.com/en-us/library/ms731064.aspx" rel="nofollow noreferrer">implement duplex service</a>, which would pass callback to client, and when client has finished processing previous batch, it can request next. Downside of this is that as far as I know, WSDualHttpBinding is not supported by silverlight.</p> <p>With binding you attached, you would be limited to 2Gb per batch, which I believe is enough. Also you would probably need to tweak timeouts, <a href="https://stackoverflow.com/questions/1520283/wcf-service-how-to-increase-the-timeout">this post</a> describe all possible timeout values in great detail.</p>
    singulars
    1. This table or related slice is empty.
    1. PONeed expert advice for WCF Service programming
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCommunity
    1. USAlexander
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PONeed expert advice for WCF Service programming
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. COMy situation is that some electronic rain gauge takes measures every 5 minutes and my customers want to see a chart of all these measures over time per year, that makes about 100 000 entities to bind in my silverlight chart control. They have other instruments that take measures more frequently too, so combining all this data together can be a big one to chew for my WCF service.
      singulars
      1. PO
      1. USPhilippe Desjardins
    2. COI'll look into your streaming solution, I think you put me on the right track.
      singulars
      1. PO
      1. USPhilippe Desjardins
    3. COWhat clients can do with 100K entities? Can they filter chart? Have you considered doing all the filtering on the server side, and just transfer enough data to show resulting chart picture? This would save network bandwidth, and app would be more responsive. Looks like a classic thin client solution to me.
      singulars
      1. PO
      1. USAlexander
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload