Mega Code Archive
Building a Data Access Layer with a User-Defined Type
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File: App_Code\DBDataLayer.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Web.Configuration;
using System.Collections.Generic;
public class DBDataLayer
{
private static readonly string _connectionString;
public List<DBProduct> GetAll()
{
List<DBProduct> results = new List<DBProduct>();
SqlConnection con = new SqlConnection(_connectionString);
SqlCommand cmd = new SqlCommand("SELECT Product FROM DBProducts", con);
using (con)
{
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
DBProduct newProduct = (DBProduct)reader["Product"];
results.Add(newProduct);
}
}
return results;
}
public void Insert(DBProduct productToAdd)
{
SqlConnection con = new SqlConnection(_connectionString);
SqlCommand cmd = new SqlCommand("INSERT DBProducts (Product) VALUES (@Product)", con);
cmd.Parameters.Add("@Product", SqlDbType.Udt);
cmd.Parameters["@Product"].UdtTypeName = "DBProduct";
cmd.Parameters["@Product"].Value = productToAdd;
using (con)
{
con.Open();
cmd.ExecuteNonQuery();
}
}
static DBDataLayer()
{
_connectionString = WebConfigurationManager.ConnectionStrings["Products"].ConnectionString;
}
}
File: ShowDBDataLayer.aspx
<%@ Page Language="C#" %>
<!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>Show DBDataLayer</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView
id="grdProducts"
DataSourceID="srcProducts"
Runat="server" />
<br />
<fieldset>
<legend>Add Product</legend>
<asp:DetailsView
id="dtlProduct"
DataSourceID="srcProducts"
DefaultMode="Insert"
AutoGenerateInsertButton="true"
AutoGenerateRows="false"
Runat="server">
<Fields>
<asp:BoundField DataField="Title" HeaderText="Title" />
<asp:BoundField DataField="Director" HeaderText="Director" />
<asp:BoundField DataField="Totals"
HeaderText="Box Office Totals" />
</Fields>
</asp:DetailsView>
</fieldset>
<asp:ObjectDataSource
id="srcProducts"
TypeName="DBDataLayer"
DataObjectTypeName="DBProduct"
SelectMethod="GetAll"
InsertMethod="Insert"
Runat="server" />
</div>
</form>
</body>
</html>
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