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Table 7.1 Custom attributes exposed by System.Data.Linq.Mapping for mapping databases to objects Attribute Description Sets up the primary-key and foreign-key relationships between classes. Identifies the mapping for a column in the database table to the specified property or field. Specifies the database name used by CreateDatabase from your mapping metadata. Used to map user-defined functions or stored procedures to a method. Used when mapping to polymorphic objects. We ll discuss this in chapter 8. Designates the parameters for a stored procedure or function. Designates the type used to perform the querying. Since LINQ to SQL is limited to SQL Server, this will indicate the version of SQL Server that will be targeted. Indicates the type of object that is returned as the result of a stored procedure or function. Designates the name of the table you wish to map to a class.

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For the moment, let s restrict our focus to the main attributes you ll use with standard tables. We ll explore stored procedures, functions, and inheritance in chapter 8. Let s take a closer look at the Table, Column, and Association attributes. Table attribute The Table attribute serves as a starting point to bridge the gap between tables and objects. If we don t specify that our class is the representation for a table, any of the other attributes we set on the properties will be useless as there will be no way of knowing what table the class is related to. To indicate that a class named Author maps to the Author table, decorate the class with the Table attribute.

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Private Sub ProductName_GotFocus() We have some tricky "overlay" text boxes here that shouldn t get the focus. Move focus to the underlying combo box if that happens. Me.cmbProductID.SetFocus End Sub

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Not only is the Table attribute one of the most critical, it is also one of the simplest. By default, just decorating the class with the Table attribute indicates that the class name is the same as the name of the table. The Table attribute also takes one parameter as an argument called Name. Use the Name argument to specify the name of the table in the database if they are not the same. For example, if we wanted to modify our Author class to use data from a table called Authors, change the attribute to include the Name parameter as follows:

As expected, the code requeries the Product combo box whenever you pick a new category (cmbCategoryDescription_AfterUpdate) or when you move to a new row (Form_Current). It also keeps the unbound combo box in sync as you move from row to row as long as the underlying record has a valid category. (A new record won t have a related CategoryDescription until you choose a Product ID, so the code doesn t update the unbound combo box on a new record.) Finally, if you try to click in CategoryDescription or ProductName, the GotFocus code moves you to the underlying combo box where you belong. Why didn t I simply set the Enabled property for CategoryDescription and ProductName to Yes If you do that, then you can t ever click into the category or product combo boxes because the disabled text box overlaid on top would block you. Note If you want to see what the filtered combo box looks like without the overlay, make a backup copy of Contacts.mdb, open the fsubContactProducts form in Design view, move the Category Description and Product Name text boxes down similar to Figure 23-19, and save the form. Now open the frmContacts form and click on the Products tab.

Now that you know how to build a filter to limit what the user sees, you can probably surmise that using a filter is a good way to open another form or report that displays information related to the current record or set of filtered records in the current form. This section shows you how to do this for both forms and reports. Later in this section, you will learn how to use events in class modules to build sophisticated links.

You ve already seen the frmContactSummary form (Figure 23-18) that uses a simple filter to link from the record selected in that form to full details in the frmContacts form. You can find similar code behind the fsubCompanyContacts form used as a subform in the frmCompanies form. Figure 23-21 shows you the frmCompanies form and the Edit This buttons I provided on the subform.

Figure 23-21. Providing a link from the Companies/Organizations form to details about a particular contact.

[Table(Name="dbo.Authors")]

To see the details for a particular contact, the user clicks the Edit This button on the chosen contact record, and code opens the frmContacts form with that contact displayed. The code behind the button is as follows:

Private Sub cmdEdit_Click() Open Contacts on the related record DoCmd.OpenForm "frmContacts", WhereCondition:="ContactID = " & Me.ContactID End Sub

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