[英]using session variable in aspx page in sql query
我在aspx页面中有sqldatasource,在查询中我想使用一个参数,即来自会话。
下面是我的代码。请帮帮我。
<asp:SqlDataSource runat="server" ID="MySQLData2"
ConnectionString='<%$ConnectionStrings:ConnectionString %>'
ProviderName="MySql.Data.MySqlClient"
SelectCommand="SELECT * FROM tablename WHERE id="Here I want to use session variable"" />
尝试这个
<asp:SqlDataSource runat="server" ID="MySQLData2"
ConnectionString='<%$ConnectionStrings:ConnectionString %>'
ProviderName="MySql.Data.MySqlClient"
SelectCommand="SELECT * FROM tablename WHERE id=@SessionVar">
<SelectParameters>
<asp:SessionParameter Name="SessionVar" SessionField="SessionVariableName" ConvertEmptyStringToNull="true" />
</SelectParameters>
</asp:SqlDataSource>
这篇MSDN文章应该为您提供所需的信息。 基本上,您将使用参数占位符“?”定义SelectCommand,然后使用SessionParameter的条目定义SelectParameters集合。
使用参数非常简单:
<asp:SqlDataSource id="Employees" runat="server"
ConnectionString="<%$ ConnectionStrings:Northwind%>"
SelectCommand="SELECT LastName FROM Employees WHERE Title = @Title">
<SelectParameters>
<asp:ControlParameter Name="Title"
ControlID="DropDownList1"
PropertyName="SelectedValue"/>
</SelectParameters>
</asp:sqldatasource>
只需将参数的值替换为您的变量即可:
<%= Sessiom[variable_name] %>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="Data Source=LAZY-PC;Initial Catalog=Test;Integrated Security=True"
ProviderName="System.Data.SqlClient" SelectCommand="SELECT * FROM [C] WHERE ([C#] = @column1)">
<SelectParameters>
<asp:SessionParameter Name="column1" SessionField="id" Type="String" />
</SelectParameters>
</asp:SqlDataSource>
Johnny_D的答案很明确,但是我想指出,有一个SessionParameter
类可用于此目的:
<asp:SqlDataSource runat="server" ID="MySQLData2"
ConnectionString='<%$ConnectionStrings:ConnectionString %>'
ProviderName="MySql.Data.MySqlClient"
SelectCommand="SELECT * FROM tablename WHERE id= ?" />
<SelectParameters>
<asp:SessionParameter
Name="id"
SessionField="SessionVariableName"
DefaultValue="0" />
</SelectParameters>
</asp:SqlDataSource>
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