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_posts/2015-02-09-using-sqlite-ef6.markdown

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+---
+title: Using SQLite and EF6 
+---
+
+Created a sample console [app](https://github.com/stormwild/SQLiteSample) using SQLite and EF6. The application uses the Chinook SQLite database and just displays the list of artists and albums that begin with A.
+
+Below is the README:
+
+# SQLiteSample
+
+Demonstrates usage of SQLite and EF6 in a console app
+
+# Prerequisites
+
+* System.Data.SQLite 1.0.94.1 
+* Chinook SQLite Database
+* EF6
+
+# Setup
+
+* Create Blank Visual Studio Solution
+* Create Class Library Project
+* Create Console project
+* Install packages:
+* `PM> Install-Package ChinookDatabase.Sqlite`
+* `PM> Install-Package System.Data.SQLite`
+* Installing SQLite also installs EF6 
+* `Update-Package or Update-Package –reinstall <package name>`
+* Leave `<package name>` blank to reinstall all
+
+# Errors
+
+## Config related errors
+
+    Column 'InvariantName' is constrained to be unique.  
+    Value 'System.Data.SQLite' is already present.
+
+{% highlight xml %}
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <entityFramework>
+        <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
+          <parameters>
+            <parameter value="mssqllocaldb" />
+          </parameters>
+        </defaultConnectionFactory>
+        <providers>
+            <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
+            <provider invariantName="System.Data.SQLite.EF6" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
+            <provider invariantName="System.Data.SQLite" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
+        </providers>
+    </entityFramework>
+    <system.data>
+        <!--
+            NOTE: The extra "remove" element below is to prevent the design-time
+                  support components within EF6 from selecting the legacy ADO.NET
+                  provider for SQLite (i.e. the one without any EF6 support).  It
+                  appears to only consider the first ADO.NET provider in the list
+                  within the resulting "app.config" or "web.config" file.
+        -->
+        <DbProviderFactories>
+            <remove invariant="System.Data.SQLite" />
+            <remove invariant="System.Data.SQLite.EF6" />
+            <add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".NET Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" />
+            <add name="SQLite Data Provider (Entity Framework 6)" invariant="System.Data.SQLite.EF6" description=".NET Framework Data Provider for SQLite (Entity Framework 6)" type="System.Data.SQLite.EF6.SQLiteProviderFactory, System.Data.SQLite.EF6" />
+        </DbProviderFactories>
+      </system.data>
+</configuration>
+{% endhighlight %}    
+
+Not sure why, but make sure to have the config for entityFramework and DbProviderFactories this way.    
+
+## Reference to complex property in entity class requires specifying the property that references the complex property
+
+    SQL logic error or missing database
+    no such column: Extent1.Artist_ArtistId
+
+{% highlight csharp %}
+namespace SQLiteSample.Entities
+{
+    public class Album
+    {
+        public long AlbumId { get; set; }
+
+        public string Title { get; set; }
+
+        // Required for sqlite to properly reference Artist
+        public long ArtistId { get; set; } 
+
+        public virtual Artist Artist { get; set; }
+    }
+}
+{% endhighlight %}
+
+## Caveats
+
+EF6 with SQLite still does not support Code First migrations.
+
+Your migration code may need to use the SQLite api directly.
+
+# References
+
+* [http://stackoverflow.com/questions/22174212/entity-framework-6-with-sqlite-3-code-first-wont-create-tables/23128288#23128288]()
+* [http://hintdesk.com/sqlite-with-entity-framework-code-first-and-migration/]()
+* [https://damienbod.wordpress.com/2013/11/18/using-sqlite-with-entity-framework-6-and-the-repository-pattern/]()
+* [http://brice-lambson.blogspot.no/2012/10/entity-framework-on-sqlite.html]()
+
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