asp.net的SqlDependency问题
sak*_*kir 6 c# sql-server asp.net sqldependency ext.net
我正在尝试使用server_broker功能从sqlserver获取更改的值.
我的代码如下
protected void Page_Load(object sender, EventArgs e)
{
GetData2();
}
private void GetData2()
{
List<Masa> lst = new List<Masa>();
using (SqlConnection con = Baglan.Sql)
{
string sql = "SELECT [Id],[Ad],[Durum] FROM [dbo].[Masa]";
using (SqlCommand cmd = new SqlCommand(sql, con))
{
con.Open();
SqlDependency dependency = new SqlDependency(cmd);
dependency.OnChange += new OnChangeEventHandler(dependency_OnDataChangedDelegate);
using (IDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
while (reader.Read())
{
Masa alt = new Masa
{
Ad = reader["Ad"].ToString(),
Id = reader["Id"].ToString(),
Durum = reader["Durum"].ToString()
};
lst.Add(alt);
}
gridMasa.GetStore().DataSource = lst;
gridMasa.GetStore().DataBind();
}
}
}
}
public void dependency_OnDataChangedDelegate(object sender, SqlNotificationEventArgs e)
{ GetData2();
SqlDependency dependency = sender as SqlDependency;
dependency.OnChange -= new OnChangeEventHandler(dependency_OnDataChangedDelegate);
}
当我通过断点检查代码时,我对数据库进行了一些更改,它可以到达名为dependency_OnDataChangedDelegate的方法,但我的数据网格没有看到变化.我在哪里做错了？
我的页面来源如下:
<ext:ResourceManager runat="server" ID="mymanager"></ext:ResourceManager>
<ext:GridPanel runat="server" ID="gridMasa" Title="MASALAR" Height="580" Layout="FitLayout" Flex="1"
IDMode="Static">
<Store>
<ext:Store ID="strMasa" runat="server">
<Model>
<ext:Model ID="Model1" runat="server">
<Fields>
<ext:ModelField Name="Id" />
<ext:ModelField Name="Ad" />
<ext:ModelField Name="Durum" />
</Fields>
</ext:Model>
</Model>
<Listeners>
<Exception Handler="Ext.Msg.alert('Products - Load failed', operation.getError());" />
</Listeners>
</ext:Store>
</Store>
<ColumnModel ID="ColumnMxodel1" Flex="1" runat="server">
<Columns>
<ext:RowNumbererColumn ID="Column5" runat="server" Text="Id"
>
</ext:RowNumbererColumn>
<ext:Column ID="KisxiId" runat="server" Hidden="true" Text="Id" DataIndex="Id"
Flex="1">
</ext:Column>
<ext:Column ID="Coluxmn2w" runat="server" Text="Masa Ad?" Flex="1" Align="Center" DataIndex="Ad">
</ext:Column>
<ext:Column ID="Column8" runat="server" Text="Durum" Flex="1" Align="Center" DataIndex="Durum">
</ext:Column>
<ext:Column ID="Column11" Hidden="true" runat="server" Text="Durum" Flex="1" Align="Center" DataIndex="Durum">
</ext:Column>
</Columns>
</ColumnModel>
<SelectionModel>
<ext:RowSelectionModel ID="rowSelectioxnModel2" ClientIDMode="Static" runat="server">
<SelectedRows>
<ext:SelectedRow RowIndex="0"></ext:SelectedRow>
</SelectedRows>
</ext:RowSelectionModel>
</SelectionModel>
</ext:GridPanel>
源代码如下:
Ext.net.ResourceMgr.init({ID: "mymanager",aspForm: "form1中"}); Ext.onReady(function(){Ext.create("Ext.grid.Panel",{store:{model:Ext.define("App.Model1",{extend:"Ext.data.Model",fields:[ {name:"Id"},{name:"Ad"},{name:"Durum"}}}),storeId:"strMasa",autoLoad:true,proxy:{data:[{"Id":"8 ","Ad":"44448989","Durum":"2"},{"Id":"9","Ad":"MASA 55i","Durum":"1"},{"Id" :"12","Ad":"MASA 3","Durum":"1"},{"Id":"44","Ad":"MASA 4","Durum":"1"}, {"Id":"45","Ad":"MASA 5","Durum":"1"},{"Id":"46","Ad":"MASA 6","Durum":" -1"},{"Id":"47","Ad":"MASA 7","Durum":" - 1"},{"Id":"48","Ad":"MASA 8" ,"Durum":" - 1"},{"Id":"49","Ad":"MASA 9","Durum":"1"},{"Id":"51","Ad" :"MASA 10","Durum":"2"},{"Id":"52","Ad":"MASA 11","Durum":" - 1"},{"Id":"53 ","Ad":"MASA 12","Durum":" - 1"},{"Id":"54","Ad":"MASA 13","Durum":" - 1"},{ "Id":"55","Ad":"MASA 14","Durum":" - 1"},{"Id":"56","Ad":"MASA 15","Durum":" -1"},{"Id":"57","Ad":"MASA 166","Durum":" - 1"}],输入:'memory'},听众:{exception:{fn:function (代理,响应,操作){Ext.Msg.alert('Products - Load failed',operation.getError());}}}},id:"gridMasa",h 八:580,renderTo: "App.gridMasa_Container",软硬度:1,布局: "适合",标题: "MASALAR",列:{ID: "ColumnMxodel1",软硬度:1,项目:[{ID: "Column5" ,的xtype: "rownumberer",文: "ID"},{ID: "KisxiId",隐藏的:真正的,柔性:1,dataIndex: "ID",文: "ID"},{ID: "Coluxmn2w",柔性:1,align:"center",dataIndex:"Ad",text:"MasaAdı"},{id:"Column8",flex:1,align:"center",dataIndex:"Durum",text:"Durum "},{ID:" Column11" ,隐藏的:真,挠曲:1,对齐: "中心",dataIndex: "硬粒",文字: "硬粒"}]},selModel:window.App.rowSelectioxnModel2 = Ext.create ( "Ext.selection.RowModel",{proxyId: "rowSelectioxnModel2",selType: "rowmodel",selectedData:[{rowIndex位置:0}]})});});
更新
这是如何启用数据库(sql server express 2012)哪些triger每次更改发生的数据库.
alter database [Your database name here] set enable_broker with rollback immediate
select name, is_broker_enabled from sys.databases
您显示的所有代码都是ASP.Net端代码.网格显示在客户端上,是一个HTML元素.您需要通知客户有关更改.HTTP刷新不是一个小问题,您必须:
- 使用客户端的计时器并定期轮询更改
- 使用WebSockets
- 使用Server-Sent Events(
Content-Type: text/event-stream)但IE不支持此功能
轮询有效,但它可能会对服务器造成负担,特别是对于大量客户端.有无数的使用Ajax的ASP.Net支持轮询的例子.
WebSockets需要Windows 8/Windows Server 2012和IIS 8,请参阅支持WebSockets协议
您可能还应该查看SignalR,这是一个ASP.Net库,专门用于将更新推送到客户端的开发人员.
如您所见,我的答案甚至没有涉及查询通知的主题.从数据库到ASP.Net中间层的通知只是方程式的一部分,而且SqlDependency确实是正确的答案.但是你完全错过了第二部分,即从中间层向浏览器推送通知.您应该只通知浏览器更新发生并且客户端应该刷新.让刷新使用通常的Page_load事件加载数据.使用SqlCacheDependency服务器页面,这将自动缓存结果并刷新任何更新的缓存.