в 15:30, 26 мая 2010

2010-05-26T15:30:57Z

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2010-05-26T11:56:48Z

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== DataRow States and DataRow Versions==



<source lang="csharp">
File: App_Code\Product.cs
using System;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Web.Configuration;
public class Product
{
private SqlDataAdapter dad = new SqlDataAdapter();
public DataTable GetAll()
{
return (DataTable)HttpContext.Current.Session["ProductsToEdit"];
}
public void Update(int id, string title, string director)
{
DataTable products = (DataTable)HttpContext.Current.Session["ProductstoEdit"];
DataRow rowToEdit = products.Rows.Find(id);
rowToEdit["title"] = title;
rowToEdit["director"] = director;
}
public void RejectChanges()
{
DataTable products = (DataTable)HttpContext.Current.Session["ProductstoEdit"];
products.RejectChanges();
}
public void AcceptChanges()
{
DataTable products = (DataTable)HttpContext.Current.Session["ProductstoEdit"];
dad.Update(products);
products.AcceptChanges(); }
public Product()
{
string connectionString = WebConfigurationManager.ConnectionStrings["Products"].ConnectionString;
dad = new SqlDataAdapter("SELECT Id,Title,Director FROM Products", connectionString);
SqlCommandBuilder builder = new SqlCommandBuilder(dad);
dad.UpdateBatchSize = 0;
HttpContext context = HttpContext.Current;
if (context.Session["ProductsToEdit"] == null)
{
DataTable dtblProducts = new DataTable();
dad.Fill(dtblProducts);
dtblProducts.PrimaryKey = new DataColumn[] { dtblProducts.Columns["Id"] };
context.Session["ProductsToEdit"] = dtblProducts;
}
}
}

File: Web.config
<configuration>
<connectionStrings>
<add name="Products"
connectionString="Data Source=.\SQLEXPRESS;
AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />
</connectionStrings>
</configuration>
File: ShowProduct.aspx
<%@ Page Language="C#" %>
<%@ Import Namespace="System.Data" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void btnReject_Click(object sender, EventArgs e)
{
Product product = new Product();
product.RejectChanges();
grdProducts.DataBind();
}
protected void btnAccept_Click(object sender, EventArgs e)
{
Product product = new Product();
product.AcceptChanges();
grdProducts.DataBind();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show Product</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<h1>Edit Products</h1>
<asp:GridView
id="grdProducts"
DataSourceID="srcProducts"
DataKeyNames="Id"
AutoGenerateEditButton="true"
Runat="server">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<%# ((DataRowView)Container.DataItem).Row.RowState %>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<br />
<asp:Button
id="btnReject"
Text="Reject Changes"
OnClick="btnReject_Click"
Runat="server" />
<asp:Button
id="btnAccept"
Text="Accept Changes"
OnClick="btnAccept_Click"
Runat="server" />
<asp:ObjectDataSource
id="srcProducts"
TypeName="Product"
SelectMethod="GetAll"
UpdateMethod="Update"
Runat="server" />
</div>
</form>
</body>
</html></source>

== Selecting DataRows==



<source lang="csharp">
<%@ Page Language="C#" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Web.Configuration" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
protected void btnSearch_Click(object sender, EventArgs e)
{
DataTable dtblProducts = (DataTable)Cache["ProductsToFilter"];
if (dtblProducts == null)
{
dtblProducts = GetProductsFromDB();
Cache["ProductsToFilter"] = dtblProducts;
}
string filter = String.Format("Title LIKE "{0}*"", txtTitle.Text);
DataRow[] rows = dtblProducts.Select(filter, "Title");
grdProducts.DataSource = rows;
grdProducts.DataBind();
}
private DataTable GetProductsFromDB()
{
string connectionString = WebConfigurationManager.ConnectionStrings["Products"].ConnectionString;
SqlDataAdapter dad = new SqlDataAdapter("SELECT Title, Director FROM Products", connectionString);
DataTable dtblProducts = new DataTable();
dad.Fill(dtblProducts);
return dtblProducts;
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show DataTable Select</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox
id="txtTitle"
Tooltip="Search"
Runat="server" />
<asp:Button
id="btnSearch"
Text="Search"
Runat="server" OnClick="btnSearch_Click" />

<hr />
<asp:GridView
id="grdProducts"
AutoGenerateColumns="false"
Runat="server">
<Columns>
<asp:TemplateField HeaderText="Title">
<ItemTemplate>
<%# ((DataRow)Container.DataItem)["Title"] %>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Director">
<ItemTemplate>
<%# ((DataRow)Container.DataItem)["Director"] %>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</div>
</form>
</body>
</html>
File: Web.config
<configuration>
<connectionStrings>
<add name="Products"
connectionString="Data Source=.\SQLEXPRESS;
AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />
</connectionStrings>
</configuration></source>

== The DataView object represents an in-memory database view.==



<source lang="csharp">
You can use a DataView object to create a sortable, filterable view of a DataTable.
<%@ Page Language="C#" %>
<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Web.Configuration" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Page_Load()
{
if (Session["ProductsToSort"] == null)
{
string connectionString = WebConfigurationManager.ConnectionStrings["Products"].ConnectionString;
SqlDataAdapter dad = new SqlDataAdapter("SELECT Id,Title,Director FROM Products", connectionString);
DataTable dtblProducts = new DataTable();
dad.Fill(dtblProducts);
Session["ProductsToSort"] = dtblProducts.DefaultView;
}
if (!Page.IsPostBack)
BindProducts();
}
void BindProducts()
{
grdProducts.DataSource = Session["ProductsToSort"];
grdProducts.DataBind();
}
protected void grdProducts_Sorting(object sender, GridViewSortEventArgs e)
{
DataView dvwProducts = (DataView)Session["ProductsToSort"];
dvwProducts.Sort = e.SortExpression;
BindProducts();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Show DataView</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView
id="grdProducts"
AllowSorting="true"
OnSorting="grdProducts_Sorting"
Runat="server" />
</div>
</form>
</body>
</html>

File: Web.config
<configuration>
<connectionStrings>
<add name="Products"
connectionString="Data Source=.\SQLEXPRESS;
AttachDbFilename=|DataDirectory|MyDatabase.mdf;Integrated Security=True;User Instance=True" />
</connectionStrings>
</configuration></source>

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в 15:30, 26 мая 2010

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