Working with XML Data in .NET

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Working with XML Data
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<xs:complexType> <xs:sequence> <xs:element name= Street1 type= xs:string minOccurs= 0 /> <xs:element name= Street2 type= xs:string minOccurs= 0 /> <xs:element name= City type= xs:string minOccurs= 0 /> <xs:element name= State type= xs:string minOccurs= 0 /> <xs:element name= ZipCode type= xs:string minOccurs= 0 /> </xs:sequence> </xs:complexType> </xs:element> </xs:sequence> <xs:attribute name= EmpID type= xs:integer use= required /> <xs:attribute name= LastName type= xs:string /> <xs:attribute name= FirstName type= xs:string /> <xs:attribute name= Salary type= xs:decimal /> </xs:complexType> </xs:element> </xs:choice> </xs:complexType> </xs:element> </xs:schema>
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Using this schema, the DataSet knows that the HireDate is indeed a date field, the EmpID is an integer, and the Salary is a decimal. The DataSet has a WriteXmlSchema method that can save the derived schema to a file. This produces a baseline schema that can modified and loaded back into the DataSet using the ReadXmlSchema.
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Figure 9.12 The EmployeeList is read into memory and bound to the DataGrid.
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Writing an XML Document from the DataSet
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A DataSet can be saved to an XML file using the WriteXml method, regardless of its original source. One option that is available is the ability to change the output type of each column when writing the data. For example, the HireDate can be an element or an attribute. The following code changes all columns of all tables to attributes and then writes the XML with an embedded schema to a file called EList.XML:
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Private Sub Button14_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles Button14.Click Dim ds As New DataSet( MyCompany ) ds.ReadXmlSchema( c:\el.xsd ) ds.ReadXml( C:\EmployeeList.XML ) Dim t As DataTable For Each t In ds.Tables Dim c As DataColumn For Each c In t.Columns c.ColumnMapping = MappingType.Attribute Next Next ds.WriteXml( c:\EList.XML , XmlWriteMode.WriteSchema) End Sub
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The code changes all columns by changing the ColumnMapping properties of all Columns of all Tables to MappingType.Attribute. The options for the MappingType are Attribute, Element, Hidden, or SimpleContent. Another change that can be made to the XML output is nesting of parent and child tables. The relation has a Nested property that can be set to control the nesting. The following code sets the Nested property to false for all relationships in the DataSet:
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Dim r As DataRelation For Each r In ds.Relations r.Nested = False Next
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When the columns are all changed to attributes and the nesting is set to false, the XML output looks like the following:
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< XML version= 1.0 standalone= yes > <EmployeeList> <Employee HireDate= 2003-01-01T00:00:00.0000000-05:00 EmpID= 1 LastName= GaryLast FirstName= Gary Salary= 50000 Employee_Id= 0 /> <Employee HireDate= 2003-01-02T00:00:00.0000000-05:00 EmpID= 2 LastName= RandyLast FirstName= Randy Salary= 40000 Employee_Id= 1 /> <Address Street1= 123 MyStreet Street2= City= MyCity State= My ZipCode= 12345 Employee_Id= 0 /> <Address Street1= 234 MyStreet Street2= City= MyCity State= My ZipCode= 23456 Employee_Id= 1 /> </EmployeeList>
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The Employee_ID is a column that was dynamically added in order to maintain the relationship between the Employee table and the Address table. Last, the name that is passed into the DataSet s constructor is the name of the DataSet, and also the name of the root element for the XML output.
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There may be times when is it more desirable to work with data in an XML fashion instead of table rows and columns. This can be done by creating an XmlDataDocument and passing a DataSet into the class constructor. In the following example, the Suppliers table is read from the Northwind database, and then an XmlDataDocument is created from the DataSet. Finally, a resultant table is created, containing the SupplierID, CompanyName, and ContactName, as shown in Figure 9.13.
Figure 9.13 Creating an HTML table by navigating the XmlDataDocument.
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Private Sub Button15_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles Button15.Click Connection Dim cn As New SqlConnection() Dim cnstr As String cnstr = server=.;integrated security=yes;database=northwind cn.ConnectionString = cnstr Command Dim cmd As New SqlCommand() cmd.CommandText = _ Select SupplierID, CompanyName, ContactName from Suppliers cmd.Connection = cn Dim da As New SqlDataAdapter(cmd) Dim ds As New DataSet( NW ) da.Fill(ds, Suppliers ) Dim x As New XmlDataDocument(ds) Dim nav As XPathNavigator = x.CreateNavigator() Dim node As XPathNodeIterator node = nav.Select( //Suppliers ) Response.Write( <table border= 1 > ) Do While node.MoveNext() Response.Write( <tr> ) Dim nav2 As XPathNavigator nav2 = node.Current Response.Write( <td> ) nav2.MoveToFirstChild() ID Response.Write(nav2.Value & ) Response.Write( </td> ) Response.Write( <td> ) nav2.MoveToNext() Response.Write(nav2.Value & ) Response.Write( </td> ) Response.Write( <td> ) nav2.MoveToNext() Response.Write(nav2.Value & <br> ) Response.Write( </td> ) Response.Write( </tr> ) Loop Response.Write( </table> ) End Sub
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This code builds a simple table containing the SupplierID, CompanyName, and ContactName, using an XPathNavigator.
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