Especificar valores XML como parâmetros.

Se uma consulta exigir um parâmetro cujo valor seja uma cadeia de caracteres XML, você poderá fornecer esse valor usando uma instância do tipo de dados SqlXml. Não há nenhuma pegadinha: as colunas XML no SQL Server aceitam valores de parâmetro exatamente da mesma maneira que outros tipos de dados.

Exemplo

O aplicativo de console a seguir cria uma tabela no banco de dados AdventureWorks. A nova tabela inclui uma coluna chamada SalesID e uma coluna XML denominada SalesInfo.

O exemplo prepara um objeto SqlCommand para inserir uma linha na nova tabela. Um arquivo salvo fornece os dados XML necessários para a coluna SalesInfo.

Para criar o arquivo necessário para que o exemplo seja executado, crie um arquivo de texto na mesma pasta que o seu projeto. Nomeie o arquivo MyTestStoreData.xml. Abra o arquivo no bloco de notas e copie e cole o seguinte texto:

<StoreSurvey xmlns="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/StoreSurvey">
  <AnnualSales>300000</AnnualSales>
  <AnnualRevenue>30000</AnnualRevenue>
  <BankName>International Bank</BankName>
  <BusinessType>BM</BusinessType>
  <YearOpened>1970</YearOpened>
  <Specialty>Road</Specialty>
  <SquareFeet>7000</SquareFeet>
  <Brands>3</Brands>
  <Internet>T1</Internet>
  <NumberEmployees>2</NumberEmployees>
</StoreSurvey>

Imports System
Imports System.Data.SqlClient
Imports System.Data.SqlTypes
Imports System.Xml

Module Module1
    Sub Main()

        Using connection As SqlConnection = New SqlConnection(GetConnectionString())
        connection.Open()

        ' Create a sample table (dropping first if it already
        ' exists.)
        Dim commandNewTable As String = _
         "IF EXISTS (SELECT * FROM dbo.sysobjects " & _
         "WHERE id = object_id(N'[dbo].[XmlDataTypeSample]') " & _
         "AND OBJECTPROPERTY(id, N'IsUserTable') = 1) " & _
         "DROP TABLE [dbo].[XmlDataTypeSample];" & _
         "CREATE TABLE [dbo].[XmlDataTypeSample](" & _
         "[SalesID] [int] IDENTITY(1,1) NOT NULL, " & _
         "[SalesInfo] [xml])"

        Dim commandAdd As New _
         SqlCommand(commandNewTable, connection)
        commandAdd.ExecuteNonQuery()

        Dim commandText As String = _
         "INSERT INTO [dbo].[XmlDataTypeSample] " & _
           "([SalesInfo] ) " & _
           "VALUES(@xmlParameter )"

        Dim command As New SqlCommand(commandText, connection)

        ' Read the saved XML document as a
        ' SqlXml-data typed variable.
        Dim newXml As SqlXml = _
         New SqlXml(New XmlTextReader("MyTestStoreData.xml"))

        ' Supply the SqlXml value for the value of the parameter.
        command.Parameters.AddWithValue("@xmlParameter", newXml)

        Dim result As Integer = command.ExecuteNonQuery()
        Console.WriteLine(result & " row was added.")
        Console.WriteLine("Press Enter to continue.")
        Console.ReadLine()
    End Using
End Sub

    Private Function GetConnectionString() As String
        ' To avoid storing the connection string in your code,
        ' you can retrieve it from a configuration file.
        Return "..."
    End Function
End Module

using System;
using System.Data;
using System.Data.SqlClient;
using System.Xml;
using System.Data.SqlTypes;

class Class1
{
    static void Main()
    {
        using (SqlConnection connection = new SqlConnection(GetConnectionString()))
       {
        connection.Open();
        //  Create a sample table (dropping first if it already
        //  exists.)

        string commandNewTable =
            "IF EXISTS (SELECT * FROM dbo.sysobjects " +
            "WHERE id = " +
                  "object_id(N'[dbo].[XmlDataTypeSample]') " +
            "AND OBJECTPROPERTY(id, N'IsUserTable') = 1) " +
            "DROP TABLE [dbo].[XmlDataTypeSample];" +
            "CREATE TABLE [dbo].[XmlDataTypeSample](" +
            "[SalesID] [int] IDENTITY(1,1) NOT NULL, " +
            "[SalesInfo] [xml])";
        SqlCommand commandAdd =
                   new SqlCommand(commandNewTable, connection);
        commandAdd.ExecuteNonQuery();
        string commandText =
            "INSERT INTO [dbo].[XmlDataTypeSample] " +
            "([SalesInfo] ) " +
            "VALUES(@xmlParameter )";
        SqlCommand command =
                  new SqlCommand(commandText, connection);

        //  Read the saved XML document as a
        //  SqlXml-data typed variable.
        SqlXml newXml =
            new SqlXml(new XmlTextReader("MyTestStoreData.xml"));

        //  Supply the SqlXml value for the value of the parameter.
        command.Parameters.AddWithValue("@xmlParameter", newXml);

        int result = command.ExecuteNonQuery();
        Console.WriteLine(result + " row was added.");
        Console.WriteLine("Press Enter to continue.");
        Console.ReadLine();
    }
  }

    private static string GetConnectionString()
    {
        // To avoid storing the connection string in your code,
        // you can retrieve it from a configuration file.
        return "...";
    }
}

Confira também

• SqlXml
• Dados XML no SQL Server
• Visão geral do ADO.NET