Irwin Dolobowsky's Blog : Tech Ed 2004

Bulkload Sample Code

irwando — Sat, 29 May 2004 06:08:00 GMT

As promised, the sample code for my presentation. The Object Demo was from Andy Conrad's article “Death, Taxes, and Relational Databases, Part 2”. The other demo was mine, and here's the code. Again, the point of this demo was to show how two parties can exchange data from their databases using SqlXml. Each database has a different schema and XML is used to transfer the data. Both parties agree on a common XML schema for the data to to be transfered, and then each create a mapping to that XML schema for their database. An XPath is issued against mapping one to retrieve data and bulkload is then used with the data and mapping two to load the second database.

Mapping against Northwind:

<xs:schema elementFormDefault='qualified' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:sql='urn:schemas-microsoft-com:mapping-schema'> <xs:element name='Employee' sql:relation='Employees' sql:key-fields='EmployeeID'> <xs:complexType> <xs:sequence> <xs:element name='AddressList' sql:is-constant='1'> <xs:complexType> <xs:sequence> <xs:element name='Address' sql:is-constant='1'> <xs:complexType> <xs:sequence> <xs:element name='Street' type='xs:string' sql:field='Address' /> <xs:element name='City' type='xs:string' sql:field='City' /> <xs:element name='State' type='xs:string' sql:field='Region' /> <xs:element name='Zip' type='xs:string' sql:field='PostalCode' /> <xs:element name='Type' type='xs:string' sql:mapped='false' /> </xs:sequence> </xs:complexType> </xs:element> </xs:sequence> </xs:complexType> </xs:element> <xs:element name='FirstName' type='xs:string' sql:field='FirstName' /> <xs:element name='LastName' type='xs:string' sql:field='LastName' /> <xs:element name='EmployeeID' type='xs:int' sql:field='EmployeeId' /> <xs:element name='Title' type='xs:string' sql:field='Title' /> </xs:sequence> </xs:complexType> </xs:element>

<xs:annotation> <xs:appinfo> <sql:relationship name='EmployeeAddress' parent='Employee' parent-key='EmployeeId' child='Address' child-key='EmployeeId' /> </xs:appinfo> </xs:annotation> </xs:schema>

Code to Query:

   try
   {
    SqlXmlCommand mycmd = new SqlXmlCommand("Provider=SQLOLEDB;Server=localhost;database=Northwind;uid=test;password=test;");
    mycmd.CommandType = SqlXmlCommandType.XPath;
    mycmd.SchemaPath = "NWEMP.xml";
    mycmd.CommandText = "/Employee";
    mycmd.RootTag = "root";

    FileStream fs = new FileStream("EmpList.xml", System.IO.FileMode.Create);
    mycmd.ExecuteToStream(fs);
    fs.Close();
   }
   catch(Exception ex)
   {
    Console.WriteLine(ex.ToString());
   }

Mapping against Sample DB (Same database as in Andy's article, making the ID field an identiy column):

<xs:schema elementFormDefault='qualified' 
xmlns:xs='http://www.w3.org/2001/XMLSchema' 
xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance'  
xmlns:sql='urn:schemas-microsoft-com:mapping-schema'
id='EmployeeMappingSchema'> 

<xs:element name='Employee' sql:relation='Employee' sql:overflow-field='Overflow' sql:key-fields='EmployeeID'> 
  <xs:complexType> 
    <xs:sequence> 
      <xs:element name='AddressList' sql:is-constant='1'>
        <xs:complexType> 
          <xs:sequence> 
            <xs:element name='Address' sql:relation='Address' sql:relationship='EmployeeAddress' sql:key-fields='AddressType'>
              <xs:complexType> 
                <xs:sequence> 
                  <xs:element name='Street' type='xs:string' sql:field='Street' /> 
                  <xs:element name='City' type='xs:string' sql:field='City' /> 
                  <xs:element name='State' type='xs:string' sql:field='State' /> 
                  <xs:element name='Zip' type='xs:string' sql:field='Zip' /> 
                  <xs:element name='Type' type='xs:string' sql:field='AddressType' default="Work"/> 
                </xs:sequence> 
              </xs:complexType> 
            </xs:element>
          </xs:sequence> 
        </xs:complexType> 
      </xs:element>
      <xs:element name='FirstName' type='xs:string' sql:field='FirstName' /> 
      <xs:element name='LastName' type='xs:string' sql:field='LastName' /> 
      <xs:element name='EmployeeID' type='xs:int' sql:field='EmployeeID' /> 
      <xs:element name='Title' type='xs:string' sql:field='Title' /> 
    </xs:sequence> 
  </xs:complexType> 
</xs:element>

<xs:annotation> <xs:appinfo> <sql:relationship name='EmployeeAddress' parent='Employee' parent-key='EmployeeID' child='Address' child-key='EmployeeID' /> </xs:appinfo> </xs:annotation> </xs:schema>

Code to Bulkload (using COM Interop):

   try
   {
    SQLXMLBULKLOADLib.SQLXMLBulkLoad3Class objBL = new SQLXMLBULKLOADLib.SQLXMLBulkLoad3Class();
    objBL.ConnectionString = "Provider=SQLOLEDB;Server=localhost;database=SampleEmployees2;uid=test;password=test;";
    objBL.ErrorLogFile = "error.xml";
    objBL.KeepIdentity = false;
    objBL.Execute ("SEDB.xml","EmpList.xml");
   }
   catch(Exception ex)
   {
    Console.WriteLine(ex.ToString());
   }

Tech Ed Wrap-Up

irwando — Fri, 28 May 2004 08:53:00 GMT

So I was hoping to have updated the blog a bit more during the week, but the internet access in the Cabana areas was iffy, and sitting back in the room here I usually just fell asleep. This was my first Tech Ed US (I went to Barcelona last year) and I can say that it was very tiring but also very enjoyable. I just got back from the big party at Sea World and some drinks with friends, and thought that I'd throw down my thoughts before enjoying a well-deserved nights rest. You can see some stuff from the trip on my personal blog here.

Overall, I thought the conference was great. Every attendee I've talked to seems to agree and has told me that they've found it to be very well run and very valuable. Always makes you good to hear that MS is doing well, so thanks to any and all of you who came out to see us.

Booth duty was probably the most tiring part, standing up for 3 hours at a clip. Data Access seems to be a a bit of a nitch area - either you love it a lot and have a deep, technical issue or you don't care about it at all. So, our visitors tended to be fewer, but always great quality when they stopped by. It was a great chance to hear how folks are using our stuff and answer some questions.

The Cabanas were a great idea too - a bit more inimate area in which to sit and chat and answer questions. It was a great place to hang out though the internet access was kinda iffy for me. It was great that customers could come find us whenever they needed a SQL question answered.

My talk went pretty well I think. Probably had 80-100 folks in the room, not bad for the last session on Thursday right before the big party. Thanks to Kent Tegels for the praise and great write up here. I did purposefully skip details on the next SqlXml release, mostly because we're still defining it. As a result of pushing back our mapping plans to post-Whidbey, SqlXml has gained a renewed interest as the client platform for XML and Yukon. So, we're looking at what we can do to improve it. Details to follow as I get them.

Here are some other folks who've been blogging on Tech Ed if you're interested (in no particular order):

And with that, I'm off to collapse into bed. As promised, I'll get my sample code posted up ASAP, hopefully in the morning.

Thanks again to all who attended. Please feel free to leave any comments/questions for me here.

New Article - Xml Support in Microsoft Sql Server 2005

irwando — Fri, 21 May 2004 22:30:00 GMT

There's a great new article up on MSDN giving an overview of the XML Support in Sql Server 2005:

XML Support in Microsoft SQL Server 2005

How do I know its great? Well, because I contributed of course! Just a little, I did the section on SqlXml. Shankar Pal and Mark Fussell did most of it. Check it out for a great overview though.

Off to San Deigo tomorrow to get in a little golf before Tech-Ed. Demos and slides are mostly done, hopefully everyone will enjoy my talk. I've ended up with 23 slides, but that also includes a nice bulkload demo and an objects out of the database demo using SqlXml. Hopefully that will be “Extreme” enough for everyone.

Tech Ed Prep

irwando — Fri, 07 May 2004 21:08:00 GMT

The past couple of weeks I've been working on my slide deck and demos for Tech Ed (DAT 405 if you're coming). My biggest concern is to make sure that my talk isn't stale. I want to ensure that anyone who comes, whether they're brand new to SqlXml or they've used it for years, gets something out of the talk. Therefore, I'm approaching it a bit differently.

Usually we give the standard history of SqlXml, go through each feature, explain what it does, one or two small demos and an “application” demo which usually consists of a small winforms app and a few lines of code that fill a text box with XML. This year though I've (we've, to those who've helped put it together) tried to focus more on real-world application scenarios.

For example, for one of my demos I've taken Dare's RSSBandit news aggrigator and SqlXml-ified it. In this demo alone I get to cover Annotated XSD, XPath, Managed Classes, Updategrams, and Bulkload. Making it even better is that you can see how each of these fit into an actual application rather than just a form with some text and buttons.

Oh, and I think the other demo will be Andy Conrad's excellent work on using SqlXml to create Decoupled Domain Models (apparently this is the new buzz word for the old buzz word of “business objects“.

I'm hoping that this will be a much more enjoyable way to present the capabilities of SqlXml, both for me so I don't have to talk about slides for 45 minutes and for attendees so they (YOU!) can see SqlXml in action rather than just listening to these abstract thoughts.

So, come by and meet me, pound me with all those buring questions I know you have, yell at me for not having feature X, or just come out for drinks. Webdata as a while will also have a booth there, I encourage you to come check it out.