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CHAPTER 11 DATA ACCESS LAYER SERVICES
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<asp:Parameter Type="String" Name="address"></asp:Parameter> <asp:Parameter Type="String" Name="city"></asp:Parameter> <asp:Parameter Type="String" Name="state"></asp:Parameter> <asp:Parameter Type="String" Name="zip"></asp:Parameter> <asp:Parameter Type="Boolean" Name="contract"></asp:Parameter> </InsertParameters> </asp:SqlDataSource>
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Figure 11-1. An editable form created with no code using the SqlDataSource Queries can also be parameterized. This page uses a drop-down list to pick a publisher, and then renders a list of titles by that publisher when the user picks one (see ParamIE.aspx in the Web11 project). Figure 11-2 shows the results. <asp:SqlDataSource Runat=server ID=sdsPublishers ConnectionString="server=.;database=pubs;uid=sa;pwd=123123" SelectCommand="select pub_id, pub_name from publishers" /> <asp:DropDownList Runat=server ID=ddlPublishers DataSourceID='sdsPublishers' DataTextField='pub_name' AutoPostBack=true DataValueField='pub_id' />
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CHAPTER 11 DATA ACCESS LAYER SERVICES
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<asp:SqlDataSource Runat=server ID=sdsTitles ConnectionString="Server=.;database=pubs;uid=sa;pwd=123123" SelectCommand="select * from titles where pub_id = @id"> <SelectParameters> <asp:ControlParameter ControlID=ddlPublishers PropertyName=SelectedValue Name="id" /> </SelectParameters> </asp:SqlDataSource> <asp:GridView Runat=server ID=gvTitles DataSourceID=sdsTitles />
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Figure 11-2. A grid that gets queried with a drop-down list, created with no code using a SqlDataSource Here you re looking to another control on the page to provide you with a connection value. That s just one of many sources that can be used for parameters. Parameter values can also be pulled from the query string, the session, cookies, or the ASP .NET profile provider. Parameters can be built into the SQL declared with the SqlDataSource, or they can be parameters of a stored procedure, named by the SelectCommand, for example.
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CHAPTER 11 DATA ACCESS LAYER SERVICES
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Table 11-3 shows a number of ways you can provide a value for the author ID column of the following SelectCommand. The table samples are all different ways to provide a value for this parameterized SQL statement. SELECT * FROM authors WHERE (au_id = @au_id) Table 11-3. Parameter Sources, Syntax, and Meanings
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Parameter
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CookieParameter
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Syntax
<asp:CookieParameter CookieName="ID" Name="au_id" Type="String" />
Meaning in Life
This parameter enables you to pull a value from a named cookie. In this example, the cookie named "ID" will be passed to the select statement in place of the @au_id parameter in the statement. This parameter enables you to pull a named property from a control on the page. In this example, you re sending the selected value of the dropdown list control named ddlID as the @au_id value in the select statement. This parameter can be used when another page is sending values to your page via an HTTP Post. You can use this to pass named values from the HTTP Post header right into the SQL statement. Here, you re passing the ID post value into the @au_id parameter of the select statement. This parameter type enables you to pull values from the custom profile infrastructure provided in ASP .NET 2.0. You name any parameter configured as a property of the custom profile provider. Here you re moving the ID custom profile property into the @au_id value in the select statement.
Continued
ControlParameter
<asp:ControlParameter ControlID="ddlID" Name="au_id" PropertyName="SelectedValue" Type="String" />
FormParameter
<asp:FormParameter FormField="ID" Name="au_id" Type="String" />
ProfileParameter
<asp:ProfileParameter Name="au_id" PropertyName="ID" Type="String" />
CHAPTER 11 DATA ACCESS LAYER SERVICES
Table 11-3. Continued
Parameter
QueryStringParameter
Syntax
<asp:QueryStringParameter Name="au_id" QueryStringField="id" Type="String" />
Meaning in Life
The query string parameter enables you to pull any value that was tacked on to the end of your URL with a named value pair. Here, you re passing the named query string value of id along into the @au_id parameter of the select command. You can also pull values from the ASP.NET Session object. Here, you re pulling the session value named id and using it as the value for the @au_id parameter of the select command.
SessionParameter
<asp:SessionParameter Name="au_id" SessionField="id" Type="String" />
You can also move connection information into configuration files and referenced by name instead of being embedded directly in the markup, using the same techniques you learned in 10 on connection string management. This entry would be in the web.config. <connectionStrings> <add name="pubsConn" connectionString="database=pubs;server=.;uid=sa;pwd=123123" /> </connectionStrings> And then you can use the <%$ ConnectionStrings:ConnectionName %> syntax from your markup. <asp:SqlDataSource Runat=server ID=sdsAuthors ConnectionString= '<%$ ConnectionStrings:pubsConn %>' SelectCommand="select * from authors" /> <asp:GridView Runat=server ID=dvAuthors DataSourceID=sdsAuthors /> In these demos, you ve seen pages that can display, query, modify, delete, and create your data. Doing so required no code. We re not going to bother showing you the Wizards and Designers that generate this markup (as there s about 100,000 screen shots of this on MSDN and the Web in general), but using these tools can eliminate the need to even learn the syntax and nuances of this markup. Creating pages like this is extremely quick and easy to do. This is powerful stuff. To reiterate, this control is great for a number of things. Evangelizing, and doing demos on, how easy Visual Studio is to use Prototyping/proof of concept/Requests for Proposals (RFPs) Internal tools or small solutions with simple requirements Any time doing something quickly is more important than any other architectural requirement
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