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POQuerying child tables with dynamic linq to sql?
 

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  1. POQuerying child tables with dynamic linq to sql?
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    <p>I have a fairly complex query I need to write. I am hoping to do it using Linq to Sql if possible. The database is something like this:</p> <p>Customers(First, Last, ID, Gender) <br> Orders (Date, Quantity, Weight, ItemName, Price) <br> Address (City, State, Zip)</p> <p>The query would be to let a user search by any of these fields, and in the case of the number fields, to search &lt;, =, or > as they desire.</p> <p>Something like this would be sample query that I'm required to implement:</p> <p>Query 1: Select customers where first name = 'John' and have at least one order with (Weight > 40 OR Quantity > 10 OR Price > 5) and zipcode = 12345.</p> <p>Query 2: Select customers where first name = 'John' and have at least one order with Weight &lt; 20 and ItemName = 'widget' and Quantity = 10) and zipcode = 12345.</p> <p>I can get the basic part of searching for customers, but I am stuck on searching the Order table where the user can specify &lt;>= in an OR manner.</p> <p><pre><code></p> <pre><code>query = Context.Customers.AsQueryable(); if (searchingFirstName) query = query.Where(cust =&gt; cust.First == firstName); if (searchingLastName) query = query.Where(cust =&gt; cust.Last == lastName); if (searchingZip) query = query.Where(cust =&gt; cust.Address.Zip == zip); // using dynamic Linq if (searchingGender) query = query.Where("Gender == @0", gender); // how do I search the Orders? The dynamic linq functions appear // to only work on the top level table </code></pre> <p></pre></code></p>
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