ASP.NET Tutorial/ADO.net Database/OleDbDataAdapter — различия между версиями

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Версия 15:30, 26 мая 2010

Filling Multiple DataTables

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="FillingMultipleDataTables" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
   <title>Filling Multiple DataTables</title>
</head>
<body>
   <form id="form1" runat="server">
      <div id="container">
         <h1>Filling Multiple DataTables</h1>
         
         This example illustrates the filling of multiple <code>DataTable</code>s
         
         <h2>Books</h2>
      <asp:GridView ID="grdBooks" runat="server" />
      <h2>Authors</h2>
      <asp:GridView ID="grdAuthors" runat="server" />
      
         <asp:Label ID="labMsg" runat="server" />
         
      </div>
   </form>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;
public partial class FillingMultipleDataTables : System.Web.UI.Page
{
   protected void Page_Load(object sender, EventArgs e)
   {
      string connString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=";
      connString += Server.MapPath("~/App_Data/Book.mdb") + ";";
      DataSet ds = new DataSet();
      try
      {
         OleDbConnection conn = new OleDbConnection(connString);
         conn.Open();
         OleDbDataAdapter adapter = new OleDbDataAdapter();
         string sqlBooks = " SELECT * FROM Books";
         OleDbCommand cmdBooks = new OleDbCommand(sqlBooks, conn);
         adapter.SelectCommand = cmdBooks;
       
         adapter.Fill(ds, "BooksTable");
         string sqlAuthors = " SELECT * FROM Authors";
         OleDbCommand cmdAuthors = new OleDbCommand(sqlAuthors, conn);
         adapter.SelectCommand = cmdAuthors;
         adapter.Fill(ds, "AuthorsTable");   
         grdAuthors.DataSource = ds.Tables["AuthorsTable"].DefaultView;
         grdAuthors.DataBind();
         grdBooks.DataSource = ds.Tables["BooksTable"].DefaultView;
         grdBooks.DataBind();
         conn.Close();
      }
      catch (Exception ex)
      {
      }
    }
}


Fill the DataSet by using the OleDbDataAdapter and connection to Access Database (VB.net)

<%@ Page Language="VB" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDB" %>
<script runat="server">
   sub Page_Load(Sender as Object, e as EventArgs) 
      dim myConnection as new OleDbConnection( _
            "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
            & "DATA SOURCE=" _
            & Server.MapPath("EmployeeDatabase.mdb;"))
      dim myCommand as OleDbDataAdapter = new OleDbDataAdapter _
         ("select * from employee", myConnection)
       dim ds as DataSet = new DataSet()
       myCommand.Fill(ds, "employee")
    end sub
</script>
<html><body>
   <form runat="server">
   
   </form>
</body></html>


Use DataTable to read the result set from an OleDbDataAdapter and a DataSet (VB.net)

<%@ Page Language="VB" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDb" %>
<script runat="server">
   sub Page_Load(Sender as object, e as eventargs)
      dim objConn as new OleDbConnection( _
            "PROVIDER=Microsoft.Jet.OLEDB.4.0;" _
            & "DATA SOURCE=" _
            & Server.MapPath("EmployeeDatabase.mdb;"))
      dim objCmd as new OleDbDataAdapter("select * from employee", objConn)
      dim ds as DataSet = new DataSet()
      objCmd.Fill(ds, "employee")
      
      dim dTable as DataTable = ds.Tables("employee")
      Dim CurrRows() as DataRow = dTable.Select(Nothing,Nothing, DataViewRowState.CurrentRows)
      Dim I, J as integer
      Dim strOutput as string
      For I = 0 to CurrRows.Length - 1
         For J = 0 to dTable.Columns.Count - 1
            strOutput = strOutput & dTable.Columns(J). _
               ColumnName & " = " & CurrRows(I)(J).ToString & _
               "<br>"
         next
      next
      Response.write(strOutput)
   end sub   
</script>
<html><body>
</body></html>
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/ADO.net_Database/OleDbDataAdapter&oldid=2679»