ASP.NET 2.0轻松实现数据库应用开发(4)
发表于:2007-06-30来源:作者:点击数:
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完成上面的所以步骤后,我们在主页面上的右键菜单上选择"查看代码",可以看到如下的代码: <%@ Page Language="C#" %> <html> <head id="Head1" runat="server"> <title>GridView Bound Fields</title> </head> <body> <form id="form1" runa
完成上面的所以步骤后,我们在主页面上的右键菜单上选择"查看代码",可以看到如下的代码:
<%@ Page Language="C#" %>
<html>
<head id="Head1" runat="server">
<title>GridView Bound Fields</title>
</head>
<body>
<form id="form1" runat="server">
<ASP:GridView ID="GridView1" DataSourceID="SqlDataSource1"AutoGenerateColumns="False" runat="server">
<Columns>
<asp:BoundField HeaderText="ID" DataField="au_id" ReadOnly="true" />
<asp:BoundField HeaderText="Last Name" DataField="au_lname" />
<asp:BoundField HeaderText="First Name" DataField="au_fname" />
<asp:BoundField HeaderText="Phone" DataField="phone" />
<asp:BoundField HeaderText="Address" DataField="address" />
<asp:BoundField HeaderText="City" DataField="city" />
<asp:BoundField HeaderText="State" DataField="state" />
<asp:BoundField HeaderText="Zip Code" DataField="zip" />
<asp:CheckBoxField HeaderText="Contract" DataField="contract" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" SelectCommand="SELECT [au_id], [au_lname], [au_fname], [phone],[address],[city], [state], [zip], [contract] FROM [authors]" ConnectionString="<%$ ConnectionStrings:Pubs %>" />
</form>
</body>
</html>
Web.Config中的代码如下:
<?XML version="1.0"?>
<configuration XMLns="http://schemas.microsoft.com/.netConfiguration/v2.0">
<appSettings/>
<connectionStrings>
<add name="Pubs" connectionString="Data Source=hoowoo;Initial Catalog=pubs;Integrated Security=True" providerName="System.Data.SqlClient" />
</connectionStrings>
<system.web>
<compilation de
bug="false"/>
<authentication mode="
Windows"/>
</system.web>
</configuration>
现在来重点分析这些代码的意义:
"<asp:GridView ID="GridView1" DataSourceID="SqlDataSource1"
AutoGenerateColumns="False" runat="server">"
数据绑定控件通过其 DataSourceID 属性连接到数据源控件,从而我们可以进行排序、分页、筛选、更新、删除和插入等一系列的操作。
"<Columns>
<asp:BoundField HeaderText="ID" DataField="au_id" ReadOnly="true" />
<asp:BoundField HeaderText="Last Name" DataField="au_lname" />
<asp:BoundField HeaderText="First Name" DataField="au_fname" />
<asp:BoundField HeaderText="Phone" DataField="phone" />
<asp:BoundField HeaderText="Address" DataField="address" />
<asp:BoundField HeaderText="City" DataField="city" />
<asp:BoundField HeaderText="State" DataField="state" />
<asp:BoundField HeaderText="Zip Code" DataField="zip" />
<asp:CheckBoxField HeaderText="Contract" DataField="contract" />
</Columns>"
"BoundField"和"CheckBoxField"均为要绑定的控件类型,"HeaderText"是将要显示在表格上字段的名称,而"DataField"则是我们要进行绑定的数据字段。
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
SelectCommand="SELECT [au_id], [au_lname], [au_fname],
[phone],[address],[city], [state], [zip], [contract] FROM [authors]"
ConnectionString="<%$ ConnectionStrings:Pubs %>" />
SqlDataSource控件中我们设置了
数据库的SelectCommand命令为"SELECT [au_id],[au_lname],[au_fname],[phone],[address] [city], [state], [zip], [contract] FROM [authors]"这正好和GridView所要绑定的控件一一对应,这充分说明了数据绑定控件和数据源控件的紧密联系。
细心的读者可能会奇怪了,ConnectionString="<%$ ConnectionStrings:Pubs %>在SqlDataSource是表示什么呢?这个问题就和我们为什么需要Web.Config配置文件有很大的关联了。Web.Config中设置了如下的节点:
<connectionStrings>
<add name="Pubs" connectionString="Data Source=hoowoo;Initial Catalog=pubs;Integrated Security=True" providerName="System.Data.SqlClient" />
</connectionStrings>
我们可以通过检索Web.Config配置文件来取得数据库连接字符串别名"Pubs"的真正的含义是
"Data Source=hoowoo;Initial Catalog=pubs;Integrated Security=True" providerName="System.Data.SqlClient" Initial Catalog表明我们使用的是"pubs"数据库。Integrated Security说明了我们采用的是Windows验证方式。
最后的显示如下:
原文转自:http://www.ltesting.net