Added "if not exists" to index creation

Author: Strowbridge, Rex

Actias.SQLite/SqliteHelpers.cs

@@ -106,7 +106,7 @@ public static IEnumerable<string> CreateIndexStatements(this DbModel model)
 
             return indicies
                 .Values
-                .Select(index => string.Format("create index {0} on {1} ({2});", index.Name, index.Table, string.Join(", ", index.Columns)))
+                .Select(index => string.Format("create index if not exists {0} on {1} ({2});", index.Name, index.Table, string.Join(", ", index.Columns)))
                 .ToList();
         }
 

Actias.SQLite/SqliteInitializer.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.Data.Entity;
+
+namespace Actias.SQLite
+{
+    public class SqliteInitializer<T> : IDatabaseInitializer<T> where T : DbContext
+    {
+        public DbModelBuilder ModelBuilder { get; private set; }
+        public string DbPath { get; private set; }
+
+        public SqliteInitializer(string dbPath, DbModelBuilder modelBuilder)
+        {
+            DbPath = dbPath;
+            ModelBuilder = modelBuilder;
+        } 
+        
+        public virtual void InitializeDatabase(T context)
+        {
+            var model = ModelBuilder.Build(context.Database.Connection);
+
+            using (var transaction = context.Database.BeginTransaction())
+            {
+                try
+                {
+                    SqliteHelpers.CreateDatabase(context.Database, model);
+                    transaction.Commit();
+                }
+                catch (Exception)
+                {
+                    transaction.Rollback();
+                    throw;
+                }
+            }
+
+            using (var transaction = context.Database.BeginTransaction())
+            {
+                try
+                {
+                    Seed(context);
+                    transaction.Commit();
+                }
+                catch (Exception)
+                {
+                    transaction.Rollback();
+                    throw;
+                }
+            }
+        }
+
+        protected virtual void Seed(T context) { }
+    }
+
+    public class Index
+    {
+        public string Name { get; set; }
+        public string Table { get; set; }
+        public List<string> Columns { get; set; }
+    }
+}