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在SQL2000查询中使用XDR的例子

March 25,2004

XDR不会不知道吧？就是简化的XML-Data啦。现在示范一个如何实现这样的查询
SELECT o.OrderID, o.OrderDate from Orders o, Customers c,
WHERE o.CustomerID = c.CustomerID and c.CompanyName = ?
Code:
<%@ Language=VBScript %>
<%
Dim sConn
sConn = "Provider=SQLOLEDB; Data Source=(local); Initial Catalog=Northwind; User ID=SA;Password=;"

Dim adoConn
Set adoConn = Server.CreateObject("ADODB.Connection")
adoConn.ConnectionString = sConn
adoConn.CursorLocation = 3 'adUseClient
adoConn.Open

Dim adoCmd
Set adoCmd = CreateObject("ADODB.Command")
Set adoCmd.ActiveConnection = adoConn
adoCmd.CommandText = "Customer[@CompanyName=""Tortuga Restaurante""]"
adoCmd.Dialect = "{ec2a4293-e898-11d2-b1b7-00c04f680c56}"

adoCmd.Properties("Mapping Schema") = "Orders.xml"
adoCmd.Properties("Base Path") = "C:INETPUBWWWROOTPBA"
adoCmd.Properties("Output Stream") = Response

Response.write "<XML ID='MyDataIsle'>"
adoCmd.Execute , , 1024 'adExecuteStream
Response.write "</XML>"
%>

Result:
<XML ID="MyDataIsle">
<Customer CustomerID="TORTU" CompanyName="Tortuga Restaurante">
  <Order CustomerID="TORTU" OrderID="10276" OrderDate="1996-08-08T00:00:00" />
  <Order CustomerID="TORTU" OrderID="10293" OrderDate="1996-08-29T00:00:00" />
  <Order CustomerID="TORTU" OrderID="10304" OrderDate="1996-09-12T00:00:00" />
  <Order CustomerID="TORTU" OrderID="10319" OrderDate="1996-10-02T00:00:00" />
  <Order CustomerID="TORTU" OrderID="10518" OrderDate="1997-04-25T00:00:00" />
  <Order CustomerID="TORTU" OrderID="10576" OrderDate="1997-06-23T00:00:00" />
  <Order CustomerID="TORTU" OrderID="10676" OrderDate="1997-09-22T00:00:00" />
  <Order CustomerID="TORTU" OrderID="10842" OrderDate="1998-01-20T00:00:00" />
  <Order CustomerID="TORTU" OrderID="10915" OrderDate="1998-02-27T00:00:00" />
  <Order CustomerID="TORTU" OrderID="11069" OrderDate="1998-05-04T00:00:00" />
</Customer>
</XML>

Orders.xml
<?xml version="1.0" ?>
<Schema xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes"
xmlns:sql="urn:schemas-microsoft-com:xml-sql">
  <ElementType name="Order" sql:relation="Orders">
<AttributeType name="CustomerID" />
<AttributeType name="OrderID" />
<AttributeType name="OrderDate" />

<attribute type="CustomerID" sql:field="CustomerID" />
<attribute type="OrderID" sql:field="OrderID" />
<attribute type="OrderDate" sql:field="OrderDate" />
  </ElementType>
  <ElementType name="Customer" sql:relation="Customers">
<AttributeType name="CustomerID" />
<AttributeType name="CompanyName" />
<attribute type="CustomerID" sql:field="CustomerID" />
<attribute type="CompanyName" sql:field="CompanyName" />
<element type="Order">
   <sql:relationship key-relation="Customers" key="CustomerID" foreign-key="CustomerID" foreign-
relation="Orders" />
</element>
  </ElementType>
</Schema>