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This example shows how you can adapt a concept like Min introduced by the standard query operators to deal with domain-specific objects. For a change, let s now see a utility operator that works on a Publisher object. Publisher.Books You can resort to any extension method that helps you simplify your code and hide complexity. For example, in the following query, we use a join clause to get access to each publisher s books:

Table 4-3.

CompanyID CompanyName Department Address City County StateOrProvince PostalCode PhoneNumber FaxNumber WebSite ReferredBy

The reason for the different behaviors on different configurations relates to a mechanism called system code write protection If system code write protection is enabled, the memory manager maps Ntoskrnlexe, the HAL, and boot drivers using standard physical pages (4 KB on x86 and x64, and 8 KB on IA64) Because the granularity of protection in an image is the standard page size, the memory manager can write-protect code pages so that an attempt to modify them generates an access fault (as seen in the first crash) However, when system code write protection is disabled on systems with more than 255 MB of RAM, the memory manager uses large pages (4 MB on x86, and 16 MB on IA64 and x86-64) to map Ntoskrnlexe and the HAL.

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Unique Company ID Company Name Department Address City County State or Province Postal/Zip Code Phone Number Fax Number Web site address Contact who referred this company

To define a simple check on the values that you allow in a field, enter an expression in the Validation Rule property box for the field. Access won t allow you to enter a field value that violates this rule. Access performs this validation for data entered in a Table window in Datasheet view, in an updateable query, or in a form. You can specify a more restrictive

from publisher in SampleData.Publishers join book in SampleData.Books on publisher equals book.Publisher into books

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select new { Publisher = publisher.Name, TotalPrice = books.TotalPrice() };

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Microsoft Office Access 2003 Inside Out validation rule in a form, but you cannot override the rule defined for the field in the table by specifying a completely different rule in the form For more information on using validation rules in forms, see 12, Customizing a Form In general, a field validation expression consists of an operator and a comparison value If you do not include an operator, Access assumes you want an equals (=) comparison You can specify multiple comparisons separated by the Boolean operators OR and AND It is good practice to always enclose text string values in quotation marks If one of your values is a text string containing blanks or special characters, you must enclose the entire string in quotation marks.

We re likely to use the same kind of join clause in every query each time we want to access a publisher s books. It could be useful to create a utility query operator to perform this operation. The operator in listing 12.5 selects a publisher s books from a sequence of books.

For example, to limit the valid entries for a City field to the two largest cities in the state of California, enter Los Angeles Or San Diego If you are comparing date values, you must enclose the date constants in pound sign (#) characters, as in #01/15/2004# You can use the comparison symbols to compare the value in the field to a value or values in your validation rule Comparison symbols are summarized in Table 4-4 For example, you might want to ensure that a numeric value is always less than 1000 To do this, enter <1000 You can use one or more pairs of comparisons to ask Access to check that the value falls within certain ranges For example, if you want to verify that a number is in the range of 50 through 100, enter either >=50 And <=100 or Between 50 And 100.

Another way to test for a match in a list of values is to use the IN comparison operator For example, to test for states surrounding the US capital, enter In ( Virginia , Maryland ) If all you need to do is ensure that the user enters a value, you can use the special comparison phrase Is Not Null..

Table 4-4.

4 4 4 4 4 4

Listing 12.5 Books custom query operator (CustomQueryOperators.cs)

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