LLBLGening

LLBLGen Pro has the ability to fetch related entities together with a set of entities, e.g. fetch a set of Customer entities and also their Order entities. This feature is called Prefetch Paths.

In this article I will explain how to use LLBLGen Pro PrefetchPaths. I divided its use in Cases so it would be easy to understand and combine cases. I know you love code so I included code snippets on each case using LLBLGen Pro API and LINQ2LLBL. Finally I will provide some tips to avoid common mistakes.

In this article I will use LLBLGen v2.6,  Adapter TemplateSet, C#, and AdventureWorks database. The concepts and code snippets are easily portables to SelfServicing.

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Sometimes you need to reproduce monster queries in your code for display specific data or to serve data to reports. In general I prefer to say that “I need certain set of data, so How can I fetch it” instead of “How can I write this query into LLBLGen Pro”. Anyway, sometimes we used to see the data as a result from a query, so it’s helpful to see the query that reproduces the resulset.

Today I will talk about LLBLGen Pro Expressions and how they are useful when building “kind of complex” query constructs like subqueries and make operations among them. I will use IExpression, ScalarQueryExpression and DbFunctionCall within a DynamicList as the target. The code is written in C#, LLBLGen Pro v2.6, Adapter Templaset, using AdvertureWorks DB (SQLServer 2005).

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