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Optimizing the number of database round trips
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Queries generated by LINQ to SQL and EF get too much or too little data at a time. Too much data in one query is a waste. Too little data is also bad because it means extra database round trips. Both LINQ to SQL and EF have good mechanisms to optimize data retrieval. In addition, the problem at hand does not necessarily apply only to an ORM (object-relational
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See Rolling Your Own SQL Update On Top Of the Entity Framework, by Alex James: http:/ / blogs.msdn.com/alexj/archive/2007/12/07/rolling-your-own-sql-update-on-top-of-the-entity-frameworkpart-1.aspx.
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mapping) or even only to databases. In a filesystem graphical user interface, you don t normally pre-fetch all of the files information throughout the entire filesystem when someone wants to look at the content of the C drive On the other hand, if you know you re going to eventually display all of the related entities information you likely do want to get them. If not, perhaps you want to get related entities all at once, when the first child entity is selected, or get the children one at a time when each child entity is selected. LINQ to SQL addresses this by implementing a property on the DataContext, the DeferredLoadingEnabled property. It is set to True by default, which means it will retrieve only the Customer object when the customer has orders, for example. The related Orders objects are retrieved with extra round trips to the database, one row at a time, when the Customer instance s Orders property is accessed in code. The related property, LoadOptions, also on the DataContext, takes a DataLoadOptions instance that allows you to control exactly how much related data is retrieved. That is, do you want only related orders or would you rather have the framework fetch orders, order details, and associated products in a single round trip The DataLoadOptions also allows you to filter the amount of data you get from related tables; that is, you can specify that you want each customer s associated orders, but only OrderID and OrderDate. ADO.NET Entity Framework does this a bit differently. It doesn t have a property that allows you to control whether deferred loading is enabled; rather, deferred loading is done by default. In order to load associated entities, there is a separate Load method, and an IsLoaded property that you can check before loading. EF also has an Include property of the query which lets you to specify which related entities can be loaded, if eager loading is desired. With EF you can also use Entity-Splitting in your design if you know you always want to retrieve OrderID and OrderDate, but no other properties, from the Orders table. Object purists may frown on composing objects based only on commonly used queries. You can also retrieve only certain columns from a table (i.e., all the columns in Customers table except the column that contains the customer s picture) with either a related type (Entity-Splitting) or an anonymous type. And you can always specify a join that returns an anonymous type, if desired, to get only the properties you need from related tables. So I d say that this worry is not only completely unwarranted, but that LINQ to SQL and EF make programmers think more about lazy loading versus eager loading. Using eager loading may be clearer and more maintainable than a join, which always returns an anonymous rowset with columns from all tables interspersed. That is, you know exactly what related data (at an object level) is being requested and retrieved. But be careful with eager loading and a join with more than two tables. The generated SQL code will produce an anonymous rowset for the first two tables, and separate queries for the remaining tables.
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