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Synchronize Your Databases with .NET Web Services (Part II)  : Page 6

When data gets created in many locations, you often need to create a process that collects and copies this data to multiple sites. In this article, you'll see how to use Web services to automatically synchronize remote databases in a decentralized way, by letting each machine query the others until they all contain the same data.


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The Synchronization Process in Overview
If you look back at the sample configuration file, you'll see that the other entries govern what the application must achieve:
  • The SourceWebServiceURLs value is a comma-delimited string containing the URLs of the Web services on the machines with which this machine will synchronize.
  • The SourceWebSiteIPAddresses value is a corresponding comma-delimited list of the key values in the tables of the databases on the machines with which this machine will synchronize. For example, the first value in the SourceWebServiceURLs list corresponds to the first key in the SourceWebSiteIPAddresses list.
  • The SourceTableList value is just a comma-delimited list of the tables to synchronize.
Given these values, the synchronization process then follows the pattern shown in the schematic in Figure 8. It iterates through the list of Web service URLs fetching a Dataset from each that contains all the tables for synchronizing, attaches a DataAdapter, and then uses the Update method to iterate through the tables inserting any new rows into the local database.



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