启用数据库缓存

要利用asp.net2.0中的新SQL Server高速缓存依赖性,必须SQL Server数据库支持该功能.可使用C:\Windows\Microsoft .NET\Framework\V2.0XXXXX\下的aspnet_regsql.exe工具或者使用SqlCacheDependencyAdmin类编写代码实现

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1.使用aspnet_regsql.exe工具

1).使数据库支持

aspnet_regsql.exe<wbr></wbr> - S<wbr>服务器地址 -U 数据库用户名<wbr></wbr></wbr> - P<wbr>数据库密码<wbr></wbr></wbr> - d<wbr>数据库名称<wbr></wbr></wbr> - dd

2).使表支持SQL高速缓存依赖性

aspnet_regsql.exe<wbr></wbr> -S<wbr>服务器地址 -U 数据库用户名</wbr> <wbr></wbr> - P<wbr>数据库密码<wbr></wbr></wbr> - d<wbr>数据库名称<wbr></wbr></wbr> - t<wbr>表名<wbr></wbr></wbr> - et

另外

-- 使数据库不支持SQL高速缓存依赖性
aspnet_regsql.exe<wbr></wbr> -S<wbr>服务器地址 -U 数据库用户名</wbr> <wbr></wbr> - P<wbr>数据库密码<wbr></wbr></wbr> - d<wbr>数据库名称<wbr></wbr></wbr> - ed
-- 使表不支持SQL高速缓存依赖性
aspnet_regsql.exe<wbr></wbr> -S<wbr>服务器地址 -U 数据库用户名</wbr> <wbr></wbr> - P<wbr>数据库密码<wbr></wbr></wbr> - d<wbr>数据库名称<wbr></wbr></wbr> - t<wbr>表名<wbr></wbr></wbr> - dt
-- 查询当前数据库支持SQL高速缓存依赖性的表
aspnet_regsql.exe<wbr></wbr> -S<wbr>服务器地址 -U 数据库用户名</wbr> <wbr></wbr> - P<wbr>数据库密码<wbr></wbr></wbr> - d<wbr>数据库名称<wbr></wbr></wbr> - lt

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2.使用SqlCacheDependencyAdmin类编写代码实现

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string <wbr>connStr<wbr></wbr></wbr> = <wbr>ConfigurationManager.ConnectionStrings[</wbr> " ConnectionString " ].ConnectionString;
SqlCacheDependencyAdmin.EnableNotifications(connStr); // 使数据库支持SQL高速缓存依赖性
SqlCacheDependencyAdmin.DisableNotifications(connStr); // 使数据库禁用SQL高速缓存依赖性
SqlCacheDependencyAdmin.EnableTableForNotificati<wbr>ons(connStr,<wbr>tableName);</wbr></wbr> // 使表支持SQL高速缓存依赖性,tableName为表名
SqlCacheDependencyAdmin.DisableTableForNotificat<wbr>ions(connStr,<wbr>tableName);</wbr></wbr> // 使表禁止SQL高速缓存依赖性

3.在<configuration>节点下配置数据库链接字符串

< connectionStrings >< add<wbr>name</wbr> = " ConnectionString " <wbr>connectionString</wbr> = " server=服务器;uid=用户名;pwd=密码;database=数据库名称 " /></ connectionStrings >

4.在<system.web>节点下配置

< caching >
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> < sqlCacheDependency<wbr>enabled</wbr> = " true " <wbr>pollTime</wbr> = " 10000 " ><!--enabled指示是否轮询更改,pollTime缓存时间,以秒为单位-->
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> < databases >
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> < add<wbr>name</wbr> = "cacheName " <wbr>connectionStringName</wbr> = " ConnectionString " /><!-- connectionStringName指定在<connectionStrings>中添加的连接字符串。name则是为该SqlCacheDependency起的名字，这个名字将在第6步中用到。 -->
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> </ databases >
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> </ sqlCacheDependency >
<wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr> </ caching >

5.客户端代码

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< ！DOCTYPE<wbr>html<wbr>PUBLIC</wbr></wbr> " //W3C//DTD<wbr>XHTML<wbr>1.0<wbr>Transitional//EN</wbr></wbr></wbr> " <wbr></wbr> " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " >

< html<wbr>xmlns</wbr> = " http://www.w3.org/1999/xhtml " <wbr></wbr> >
< head<wbr>runat</wbr> = " server " >
<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr> < title > 无标题页 </ title >
</ head >
< body >
<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr> < form<wbr>id</wbr> = " form1 " <wbr>runat</wbr> = " server " >
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> < asp:Label<wbr>ID</wbr> = " Label1 " <wbr>runat</wbr> = " server " <wbr>Text</wbr> = " Label " ></ asp:Label >
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> < asp:GridView<wbr>ID</wbr> = " GridView1 " <wbr>runat</wbr> = " server " >
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> </ asp:GridView >
<wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr> </ form >
</ body >
</ html >

6.服务端代码

using <wbr>System;<br></wbr> using <wbr>System.Data;<br></wbr> using <wbr>System.Data.SqlClient;<br></wbr> using <wbr>System.Configuration;<br></wbr> using <wbr>System.Collections;<br></wbr> using <wbr>System.Web;<br></wbr> using <wbr>System.Web.Security;<br></wbr> using <wbr>System.Web.UI;<br></wbr> using <wbr>System.Web.UI.WebControls;<br></wbr> using <wbr>System.Web.UI.WebControls.WebParts;<br></wbr> using <wbr>System.Web.UI.HtmlControls;<br><br></wbr> using <wbr>System.Web.Caching;</wbr>

public <wbr></wbr> partial <wbr></wbr> class <wbr>Default3<wbr>:<wbr>System.Web.UI.Page<br> {<br><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> protected <wbr></wbr> void <wbr>Page_Load(</wbr> object <wbr>sender,<wbr>EventArgs<wbr>e)<br><wbr><wbr><wbr><wbr>{<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>DataSet<wbr>dt;<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>dt<wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> = <wbr>(DataSet)Cache[</wbr> " firmOrders " ];
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> if <wbr>(dt<wbr></wbr></wbr> == <wbr></wbr> null )
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>{<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> string <wbr>connStr<wbr></wbr></wbr> = <wbr>ConfigurationManager.ConnectionStrings[</wbr> " ConnectionString " ].ConnectionString;
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> string <wbr>sql<wbr></wbr></wbr> = <wbr></wbr> " select<wbr>*<wbr>from<wbr>Orders</wbr></wbr></wbr> " ;

<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>SqlConnection<wbr>conn<wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> = <wbr></wbr> new <wbr>SqlConnection(connStr);<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>SqlDataAdapter<wbr>da<wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> = <wbr></wbr> new <wbr>SqlDataAdapter(sql,<wbr>conn);<br><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>dt<wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> = <wbr></wbr> new <wbr>DataSet();<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>da.Fill(dt);<br><span style="font-family:simsun; font-size:14px; line-height:21px; background-color:rgb(186,186,186); word-wrap:normal; word-break:normal">//不加下面两句会报错</span></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>

SqlCacheDependencyAdmin.EnableNotifications(connStr);//使数据库支持SQL高速缓存依赖性

SqlCacheDependencyAdmin.EnableTableForNotificati<wbr>ons(connStr,<wbr>tableName);</wbr></wbr>//使表支持
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>SqlCacheDependency<wbr>myDependency<wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> = <wbr></wbr> new <wbr>SqlCacheDependency(</wbr> " cacheName " ,<wbr></wbr> " Orders " );
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Cache.Insert(</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> " firmOrders " ,<wbr>dt,<wbr>myDependency);<br><br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Label1.Text<wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> = <wbr></wbr> " 从数据库读取 " ;
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>}<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> else
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>{<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>Label1.Text<wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> = <wbr></wbr> " 从内存读取 " ;
<wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>}<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>GridView1.DataSource<wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr> = <wbr>dt;<br><wbr><wbr><wbr><wbr><wbr><wbr><wbr><wbr>GridView1.DataBind();<br><wbr><wbr><wbr><wbr>}<br> }</wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr></wbr>