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Ange XML-värden som parametrar

  • Artikel

Om en fråga kräver en parameter vars värde är en XML-sträng kan du ange det värdet med hjälp av en instans av SqlXml datatypen. Det finns verkligen inga trick; XML-kolumner i SQL Server accepterar parametervärden på exakt samma sätt som andra datatyper.

Exempel

Följande konsolprogram skapar en ny tabell i AdventureWorks-databasen . Den nya tabellen innehåller en kolumn med namnet SalesID och en XML-kolumn med namnet SalesInfo.

Kommentar

AdventureWorks-exempeldatabasen installeras inte som standard när du installerar SQL Server. Du kan installera det genom att köra SQL Server-installationsprogrammet.

Exemplet förbereder ett SqlCommand objekt för att infoga en rad i den nya tabellen. En sparad fil innehåller DE XML-data som behövs för kolumnen SalesInfo .

Skapa en ny textfil i samma mapp som projektet om du vill skapa den fil som behövs för att exemplet ska kunna köras. Ge filen namnet MyTestStoreData.xml. Öppna filen i Anteckningar och kopiera och klistra in följande text:

<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 "...";
    }
}

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