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Chapter 13

How to useSQL data sources

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ObjectivesApplied Use a SQL data source to get the data that an application requires. Use the Query Builder to create the Select statement for a SQL

data source. Use a DataList control to present the data thats ret rieved by a

SQL data source. Use a list control such as a drop-down list to present the datathats retrieved by a SQL data source.

Use a SQL data source to update the data in a database.

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Objectives (cont.)Knowledge Describe how a select parameter that gets its value from a control

is defined. Describe how you use the Eval and Bind methods within the

templates of a DataList control to bind the template controls tocolumns of a data source.

Describe the additional code thats generated for a data source tha tcan update the database.

Explain when you might change the DataSourceMode attribute ofa data source from its default setting of DataSet to DataReader.

Explain when you might want to store the data thats retrieved bya data source in the servers cache memory.

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The Product List application displayed in a webbrowser

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The starting dialog box of the Data SourceConfiguration Wizard

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Aspx code generated for a basic SqlDataSourcecontrol

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Basic SqlDataSource control attributes

Attribute DescriptionID The ID for the SqlDataSource control.Runat Must specify server.ConnectionString The connection string. In most cases, you

should use a

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The dialog boxes for defining a connection

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The dialog box for saving the connection string inthe web.config file

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The ConnectionStrings section of the web.configfile

Aspx code that refers to a connection string in theweb.config file

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The dialog box for defining the Select statement

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The dialog box for entering a custom Selectstatement

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The Add WHERE Clause dialog box

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The WHERE clause section after a condition hasbeen added

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The aspx code for a SqlDataSource control thatincludes a select parameter

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Elements used to define select parameters

SelectParameters ControlParameter QueryStringParameter FormParameter SessionParameter ProfileParameter CookieParameter

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The ControlParameter elementAttribute Description

Name The parameter name.Type The SQL data type of the parameter.ControlID The ID of the web form control that supplies the

value for the parameter.PropertyName The name of the property from the web form control

that supplies the value for the parameter.

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The Query Builder dialog box

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The dialog box for defining parameters

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Parameter sources

Source DescriptionControl The parameters value comes from a control on the

page.QueryString The parameters value comes from a query string in

the URL used to request the page.

Form The parameters value comes from an HTML formfield.

Session The parameters value comes from an item in sessionstate.

Profile The parameters value com es from a profile property.Cookie The parameters value comes from a cookie.

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A simple list displayed by a DataList control

The asp tag for the DataList control

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Basic attributes of the DataList control

Attribute DescriptionID The ID for the DataList control.Runat Must specify server. DataSourceID The ID of the data source to bind the data list to.

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The Item template in template-editing mode

A Header template

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Common template elements for a data list

Element DescriptionHeaderTemplate Displayed before the first item in the data

source.FooterTemplate Displayed after the last item in the data

source.ItemTemplate Displayed for each item in the data source.AlternatingItemTemplate Displayed for alternating items in the data

source.SeparatorTemplate Displayed between items.

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The Format page of the Properties dialog box

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Common style elements for a data listElement DescriptionHeaderStyle The style used for the header.FooterStyle The style used for the footer.ItemStyle The style used for each item in the data

source.

AlternatingItemStyle The style used for alternating items in the datasource.

SeparatorStyle The style for the separator.

The asp tag for a Header style

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The Data Source Configuration Wizard for bindinga drop-down list

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List control attributes for data bindingAttribute Description

DataSourceID The ID of the data source to bind the list to.DataTextField The name of the data source field that should be

displayed in the list.DataValueField The name of the data source field whose value

should be returned by the SelectedValue property ofthe list.

The aspx code for a drop- down list thats bound toa SQL data source

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The DataBindings dialog box for binding a control

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The syntax of the Eval and Bind methods

Code examples

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Default.aspx file: Product List application

Choose a category:

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Default.aspx file: Product List application (cont.)

ID Product

Unit Price

On Hand

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Default.aspx file: Product List application (cont.)

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Default.aspx file: Product List application (cont.)

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Default.aspx file: Product List application (cont.)

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The Advanced SQL Generation Options dialog

box

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The aspx code for a SqlDataSource control thatuses action queries

DeleteCommand="DELETE FROM [Categories]

WHERE [CategoryID] = @CategoryID"

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The aspx code for a SqlDataSource control thatuses action queries (continued)

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The DataSourceMode attributeAttribute Description

DataSourceMode DataSet or DataReader. The default is DataSet, but you can specify DataReader if the data sourceis read-only.

A SqlDataSource control that uses a data reader

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SqlDataSource attributes for caching EnableCaching CacheDuration CacheExpirationPolicy CacheKeyDependency

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A SqlDataSource control that uses caching