一次性更新所有的Gridview记录

 
我们经常会遇到这样的情况,在Gridview中列出的所有记录中,有时要同时修改多条记录,并且将其保存到数据库中去。那么在Gridview中应该如何实现呢?在Gridview中,有两种实现的方法,下面分别进行介绍:
   先来看下第一种方法,本方法是使用sqldatasource来更新所有记录,但这个方法比较慢,因为每更新一条记录都要建立数据连接并执行updatecommand,会影响性能。其主要代码如下:
<script runat="server">
void Button1_Click(object sender, EventArgs e)
{
  for (int i = 0; i < Gridview1.Rows.Count; i++)
  {
   GridviewRow row = Gridview1.Rows[i];
   SqlDataSource1.UpdateParameters[0].DefaultValue = ((TextBox)row.Cells[0].FindControl("TextBox2")).Text;
   SqlDataSource1.UpdateParameters[1].DefaultValue = ((TextBox)row.Cells[1].FindControl("TextBox3")).Text;
   SqlDataSource1.UpdateParameters[2].DefaultValue = Gridview1.DataKeys[i].Value.ToString();
   SqlDataSource1.Update();
  }
}
</script>
<html xmlns=" http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>Untitled Page</title>
</head>
<body>
  <form id="form1" runat="server">
  <div>
  <asp:Gridview ID="Gridview1" Runat="server" DataSourceID="SqlDataSource1" DataKeyNames="CustomerID" AutoGenerateColumns="False">
  <Columns>
  <asp:TemplateField SortExpression="CustomerID" HeaderText="CustomerID">
  <ItemTemplate>
   <asp:TextBox Runat="server" Text=’<%# Bind("CustomerID") %>’ ID="TextBox1"></asp:TextBox>
  </ItemTemplate>
  </asp:TemplateField>
   <asp:TemplateField SortExpression="CompanyName" HeaderText="CompanyName">
   <ItemTemplate>
    <asp:TextBox Runat="server" Text=’<%# Bind("CompanyName") %>’ ID="TextBox2"></asp:TextBox>
   </ItemTemplate>
  </asp:TemplateField>
  <asp:TemplateField SortExpression="ContactName" HeaderText="ContactTitle">
   <ItemTemplate>
    <asp:TextBox Runat="server" Text=’<%# Bind("ContactTitle") %>’ ID="TextBox3"></asp:TextBox>
   </ItemTemplate>
  </asp:TemplateField>
  </Columns>
  </asp:Gridview>
<asp:SqlDataSource ID="SqlDataSource1" Runat="server"
SelectCommand="SELECT [CustomerID], [CompanyName], [ContactName], [ContactTitle] FROM [Customers]"
UpdateCommand="UPDATE [Customers] SET [CompanyName] = @CompanyName, [ContactTitle] = @ContactTitle WHERE [CustomerID] = @CustomerID"
ConnectionString="server=localhost;uid=sa;password=xxxx;database=northwind">
<UpdateParameters>
<asp:Parameter Type="String" Name="CompanyName"></asp:Parameter>
<asp:Parameter Type="String" Name="ContactTitle"></asp:Parameter>
<asp:Parameter Type="String" Name="CustomerID"></asp:Parameter>
</UpdateParameters>
</asp:SqlDataSource>
<asp:Button ID="Button1" Runat="server" Text="Button" OnClick="Button1_Click" />
</div>
</form>
</body>
</html>
   在上面的代码中,我们必须首先指定updateparameters参数集合,也就是指出要更新的是哪些字段,它们的类型是什么。之后并指出sqldatasource的updatecommand语句。而在更新按钮button1的CLICK事件中,将以遍历的形式,使用for循环,对Gridview中的每一行进行检查,将每个更新了的文本框的内容放到sqldatasouce的updateparameters参数中去,最后调用sqldatasource的update方法,完成更新。
   方法2使用的是首先遍历Gridview中的每一行,并且使用SQL语句,将要更新的内容连接起来,然后最后才使用command.ExecuteNonQuery()进行更新,效率高了,主要代码如下:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
  SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["AppConnectionString1"].ConnectionString);
  SqlCommand command = new SqlCommand("SELECT [CustomerID], [CompanyName], [ContactName], [ContactTitle] FROM [Customers]", con);
  con.Open();
  Gridview1.DataSource = command.ExecuteReader();
  Gridview1.DataBind();
  con.Close();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
  StringBuilder query = new StringBuilder();
  for (int i = 0; i < Gridview1.Rows.Count; i++)
  {
   GridviewRow row = Gridview1.Rows[i];
   string value1 = ((TextBox)row.Cells[0].FindControl("TextBox2")).Text.Replace("’", "’’");
   string value2 = ((TextBox)row.Cells[1].FindControl("TextBox3")).Text.Replace("’", "’’");
   string value3 = Gridview1.DataKeys[i].Value.ToString();
   query.Append("UPDATE [Customers] SET [CompanyName] = ’").Append(value1).Append("’ , [ContactTitle] = ’")
.Append(value2).Append("’ WHERE [CustomerID] = ’").Append(value3).Append("’;\n");
  }
  SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["AppConnectionString1"].ConnectionString);
  SqlCommand command = new SqlCommand(query.ToString(), con);
  con.Open();
  command.ExecuteNonQuery();
  con.Close();
}
}
   其中要特别注意一点的是,在vs.net 2005 beta 2开始,如果你在web.config中使用了数据库连接字符串的配置,那么应该按如下的方法去写:
<connectionStrings>
<add name="NorthwindConnectionString" connectionString="Data Source=LIAO;Initial Catalog=Northwind;User ID=sa;Password=xxxx" providerName="System.Data.SqlClient"/>
</connectionStrings>
   然后在程序中如下进行读取:
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["AppConnectionString1"].ConnectionString);

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