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Writing conditions inline, as we did in the second query in Listing 13-5, is not very good for readability or maintainability. Typically, we would use the let keyword to make the code cleaner and more readable. In some cases, however, this leads to more complex and often less efficient SQL code. Let s take a look at the SQL generated by both approaches. Listing 13-6 shows the SQL generated for the first query. Notice that the where clause contains a case statement with quite a bit of cast ing going on. If we had more parameters in our search query, beyond just name and reservation date, the resulting SQL statement would get even more complicated.

When preparing the query, you need to send not only the updated values across the wire, but all of the original values as well Evaluating the where clause will take the database much longer to do than it would if it were using only primary key or indexed columns Also, it won t work for binary type columns (image, text, etc) You must make special consideration for null values, as well (as the expression null = null evaluates to false).

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Listing 13-7 shows the SQL generated from the second query, where we created the conditions inline. This query is simpler and likely more efficient at runtime. Listing 13-6. SQL generated when let is used in the LINQ query SELECT [Extent1].[ReservationId] AS [ReservationId], [Extent1].[ResDate] AS [ResDate], [Extent1].[Name] AS [Name] FROM [13].[Reservation] AS [Extent1] WHERE ( (CASE WHEN (@p__linq__0 IS NULL OR @p__linq__1 = CAST( [Extent1].[ResDate] AS datetime2)) THEN cast(1 as bit) WHEN ( NOT (@p__linq__0 IS NULL OR @p__linq__1 = CAST( [Extent1].[ResDate] AS datetime2))) THEN cast(0 as bit) END) = 1) AND ((CASE WHEN ((@p__linq__2 = @p__linq__3) OR ([Extent1].[Name] LIKE @p__linq__4 ESCAPE N''~'')) THEN cast(1 as bit) WHEN ( NOT ((@p__linq__2 = @p__linq__3) OR ([Extent1].[Name] LIKE @p__linq__4 ESCAPE N''~''))) THEN cast(0 as bit) END) = 1) Listing 13-7. Cleaner, more efficient SQL generated when not using let in a LINQ query SELECT [Extent1].[ReservationId] AS [ReservationId], [Extent1].[ResDate] AS [ResDate], [Extent1].[Name] AS [Name] FROM [13].[Reservation] AS [Extent1] WHERE (@p__linq__0 IS NULL OR @p__linq__1 = CAST( [Extent1].[ResDate] AS datetime2)) AND ((@p__linq__2 = @p__linq__3) OR ([Extent1].[Name] LIKE @p__linq__4 ESCAPE N''~''))

Alternate: When [No candidates were found:] 5b_1. The system displays a message Location not found on the Quick Search Window. Result: No candidates were found: complete. Use case ends.

Suppose you have the model with an account and related payments like the one in Figure 13-6.

Here s an example of what an update query using this strategy might look like: update authors set au_lname = @au_lname, au_fname = @au_fname, phone = @phone, address = @address, city = @city, state = @state, zip = @zip, contract = @contract WHERE au_id = '123123' and au_lname = @org_au_lname and au_fname = @org_au_fname and phone = @org_phone and (address = @org_address or (address is null and @org_address is null)) and city = @org_city or (city is null and @org_city is null)) and state = @org_state or.

Figure 13-6. A model with an Account entity and a related Payment If you are using POCO and want to get the best change-tracking performance, we need to have Entity Framework create change-tracking proxies for our classes so that it is immediately notified of changes to our objects. To get the change-tracking proxies created for our classes, mark each property as virtual, as shown in Listing 13-8. Additionally, each navigation property is of type ICollection<T>. Listing 13-8. Our POCO classes with properties marked as virtual and the navigation properties are of type ICollection<T> public class Account { public virtual int AccountId { get; set; } public virtual string Name { get; set; } public virtual decimal Balance { get; set; } public virtual ICollection<Payment> Payments { get; set; } } public class Payment { public virtual int PaymentId { get; set; } public virtual string Name { get; set; } public virtual string PaidTo { get; set; } public virtual decimal Paid { get; set; } public virtual int AccountId { get; set; } } public class EFRecipesEntities : ObjectContext { private ObjectSet<Account> _accounts; private ObjectSet<Payment> _payments; public EFRecipesEntities() : base("name=EFRecipesEntities", "EFRecipesEntities") { _accounts = CreateObjectSet<Account>(); _payments = CreateObjectSet<Payment>(); } public ObjectSet<Account> Accounts { get { return _accounts; }

No Use candidates Address_TestCase1 were found:

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