Wie kann DataSet zwei verwandte Tabellen zurückgeben?

Question

Ich verwende C# +. Net 3.5 + VSTS 2008 + ADO.Net + SQL Server 2008. Ich habe zwei verwandte Tabellen in SQL Server (Fremdschlüssel-Beziehung). Und ich möchte die zwei Tabellen als zwei Databases in einem Dataset laden. Irgendein Referenzcode, um dies zu tun?

Vielen Dank im Voraus, George

Answer 1

Versuchen Sie, diese

Dim myAdapter as SqlDataAdapter = new SqlDataAdapter(
     “SELECT * FROM Customers; SELECT * FROM Orders“, connection) 

myAdapter.Fill(dsTables) 
dsTables.Tables(0).TableName = “Customers“) 
dsTables.Tables(1).TableName = “Orders“) 

http://pietschsoft.com/post/2004/08/22/Fill-DataSet-with-multiple-Tables-and-update-them-with-DataAdapter.aspx

Answer 2

George,

Können Sie bitte Ihre Frage klären - ist es etwa mulitple Tabellen in Dataset füllen oder speziell reelle Tabellen.

Für mehrere Tabellen Laden betrifft Sie folgenden Code verweisen können (dieser Code ist bei MSDN http://msdn.microsoft.com/en-us/library/5fd1ahe2.aspx avialable):

static void Main() 
{ 
    DataSet dataSet = new DataSet(); 

    DataTable customerTable = new DataTable(); 
    DataTable productTable = new DataTable(); 

    // This information is cosmetic, only. 
    customerTable.TableName = "Customers"; 
    productTable.TableName = "Products"; 

    // Add the tables to the DataSet: 
    dataSet.Tables.Add(customerTable); 
    dataSet.Tables.Add(productTable); 

    // Load the data into the existing DataSet. 
    DataTableReader reader = GetReader(); 
    dataSet.Load(reader, LoadOption.OverwriteChanges, 
     customerTable, productTable); 

    // Print out the contents of each table: 
    foreach (DataTable table in dataSet.Tables) 
     { 
     PrintColumns(table); 
     } 

    Console.WriteLine("Press any key to continue."); 
    Console.ReadKey(); 
} 

private static DataTable GetCustomers() 
{ 
    // Create sample Customers table. 
    DataTable table = new DataTable(); 
    table.TableName = "Customers"; 

    // Create two columns, ID and Name. 
    DataColumn idColumn = table.Columns.Add("ID", typeof(int)); 
    table.Columns.Add("Name", typeof(string)); 

    // Set the ID column as the primary key column. 
    table.PrimaryKey = new DataColumn[] { idColumn }; 

    table.Rows.Add(new object[] { 0, "Mary" }); 
    table.Rows.Add(new object[] { 1, "Andy" }); 
    table.Rows.Add(new object[] { 2, "Peter" }); 
    table.AcceptChanges(); 
    return table; 
} 

private static DataTable GetProducts() 
{ 
    // Create sample Products table. 
    DataTable table = new DataTable(); 
    table.TableName = "Products"; 

    // Create two columns, ID and Name. 
    DataColumn idColumn = table.Columns.Add("ID", 
     typeof(int)); 
    table.Columns.Add("Name", typeof(string)); 

    // Set the ID column as the primary key column. 
     table.PrimaryKey = new DataColumn[] { idColumn }; 

    table.Rows.Add(new object[] { 0, "Wireless Network Card" }); 
    table.Rows.Add(new object[] { 1, "Hard Drive" }); 
    table.Rows.Add(new object[] { 2, "Monitor" }); 
    table.Rows.Add(new object[] { 3, "CPU" }); 
    table.AcceptChanges(); 
    return table; 
} 

private static void PrintColumns(DataTable table) 
{ 
    Console.WriteLine(); 
    Console.WriteLine(table.TableName); 
    Console.WriteLine("========================="); 
    // Loop through all the rows in the table: 
    foreach (DataRow row in table.Rows) 
    { 
     for (int i = 0; i < table.Columns.Count; i++) 
     { 
      Console.Write(row[i] + " "); 
     } 
     Console.WriteLine(); 
    } 
} 

private static DataTableReader GetReader() 
{ 
    // Return a DataTableReader containing multiple 
    // result sets, just for the sake of this demo. 
    DataSet dataSet = new DataSet(); 
    dataSet.Tables.Add(GetCustomers()); 
    dataSet.Tables.Add(GetProducts()); 
    return dataSet.CreateDataReader(); 
} 

Hier ist der Code Eltern-Kind-Beziehung für die Verwaltung der Daten

Imports System.Data 
Imports System.Data.SqlClient 
Imports System.Configuration 

Public Class DataRelation 
    Inherits System.Web.UI.Page 

    Protected lblDisplay As System.Web.UI.WebControls.Label 

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
    Dim objConn As SqlConnection 
    Dim da As SqlDataAdapter 
    Dim ds As DataSet 
    Dim dtrParent As DataRow 
    Dim dtrChild As DataRow 

    objConn = New SqlConnection(ConfigurationSettings.Appsettings("NorthwindConnection")) 
    da = New SqlDataAdapter("SELECT * FROM Categories", objConn) 
    ds = New DataSet() 
    Try 
     objConn.Open() 
     da.Fill(ds,"Categories") 
     da.SelectCommand = New SqlCommand("SELECT * FROM Products", objConn) 
     da.Fill(ds, "Products") 
    Catch exc As SqlException 
     Response.Write(exc.ToString()) 
    Finally 
     objConn.Dispose() 
    End Try 
    'Create the Data Relationship 
    ds.Relations.Add("Cat_Prod",ds.Tables("Categories").Columns("CategoryID"), _ 
          ds.Tables("Products").Columns("CategoryID")) 

    'Display the Category and Child Products Within 
    For each dtrParent in ds.Tables("Categories").Rows 
     lblDisplay.Text &= "<h3>" & dtrParent("CategoryName") & "</h3><ul>" 
     For each dtrChild in dtrParent.GetChildRows("Cat_Prod") 
     lblDisplay.Text &= "<li>" & dtrChild("ProductName") & "</li>" 
     Next 
     lblDisplay.Text &= "</ul>" 
    Next 
    End Sub 

End Class 

setzt

Sie weitere Erklärung über here finden

Answer 3

Hier ist ein Beispielcode, wie ein DataSet mit LINQ qu laden eries Hier haben 2 Tabellen eine Beziehung. "dc" ist der Datenkontext.

  var query = dc.GetTable<Media>().Where(s => s.MediaID == new Guid("A72AA79A-6C40-4D6B-A826-241553FECDFE")); 
      var query1 = dc.GetTable<MediaVersion>().Where(s => s.MediaID == new Guid("A72AA79A-6C40-4D6B-A826-241553FECDFE")); 
      var query2 = dc.GetTable<RootPath>().Where(s => s.RootPathID == new Guid("62145B2C-BA36-4313-8CA2-0F224F8FE7E8")); 


      SqlCommand cmd = dc.GetCommand(query) as SqlCommand; 
      //Load first 
      SqlDataAdapter ada = new SqlDataAdapter(cmd); 
      DataSet ds = new DataSet(); 
      ada.Fill(ds, "Media"); 
      //Load second 
      cmd = dc.GetCommand(query1) as SqlCommand; 
      ada.SelectCommand = cmd; 
      ada.Fill(ds, "MediaVersion"); 
      ds.Relations.Add("Med_MedVer", ds.Tables["Media"].Columns["MediaID"], 
         ds.Tables["MediaVersion"].Columns["MediaID"]); 

      //Load third independent table 
      cmd = dc.GetCommand(query2) as SqlCommand; 
      ada.SelectCommand = cmd; 
      ada.Fill(ds, "RootPath");