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

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м (1 версия)
 
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Текущая версия на 11:56, 26 мая 2010

By changing the provider name and properly adapting the connection string and command.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" 
    Inherits="Default"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Agnostic</title>
</head>
<body>
        
    </div>
    
    <div id="pageContent">
        <form id="form1" runat="server">
            <table>
            <tr>
            <td><b>Provider</b></td>
            <td><asp:TextBox ID="ProviderNameBox" runat="server" Width="500px"
                text="System.Data.SqlClient"></asp:TextBox></td>
            </tr>
            <tr>
            <td><b>Connection String</b></td>
            <td><asp:TextBox ID="ConnectionStringBox" runat="server" Width="500px"
                text="SERVER=(local);DATABASE=northwind;Trusted_Connection=yes;"></asp:TextBox></td>
            </tr>
            <tr>
            <td><b>Command Text</b></td>
            <td><asp:TextBox ID="CommandTextBox" runat="server" Width="500px"
                text="SELECT TOP 15 customerid, companyname FROM customers"></asp:TextBox></td>
            </tr>
            </table>
            <asp:Button runat="server" ID="RunButton" Text="Run" OnClick="RunButton_Click" />
            <hr />
            <asp:datagrid runat="server" id="Results">
                <HeaderStyle Font-Bold="true" />
            </asp:datagrid>
        </form>
    </div>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Data.rumon;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class Default : System.Web.UI.Page
{
    protected void RunButton_Click(object sender, EventArgs e)
    {
        string provider = ProviderNameBox.Text;
        string connString = ConnectionStringBox.Text;
        string commandText = CommandTextBox.Text;
        DbProviderFactory fact = DbProviderFactories.GetFactory(provider);
        DbConnection conn = fact.CreateConnection();
        conn.ConnectionString = connString;
        DbDataAdapter adapter = fact.CreateDataAdapter();
        adapter.SelectCommand = conn.CreateCommand();
        adapter.SelectCommand.rumandText = commandText;
        DataTable table = new DataTable();
        adapter.Fill(table);
        Results.DataSource = table;
        Results.DataBind();
    }
}


Provider is characterized by an invariant name, a description, and a type that contains assembly and class information.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" 
    Inherits="Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>Listing Factory Objects</title>
</head>
<body>
    <div id="pageContent">
        <form id="form1" runat="server">
            <asp:datagrid runat="server" id="provList" Font-Size="8pt">
                <HeaderStyle Font-Bold="true" />
            </asp:datagrid>
        </form>
    </div>
</body>
</html>
File: Default.aspx.cs
using System;
using System.Data;
using System.Data.rumon;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        DataTable providers = DbProviderFactories.GetFactoryClasses();
        provList.DataSource = providers;
        provList.DataBind();
    }
}
Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/ADO.net_Database/DbProviderFactories&oldid=2660»