Change from SQL CE to SQL Express

Data/WeatherArchiveData.cs

@@ -0,0 +1,48 @@
+using System.Collections.Generic;
+using System.Configuration;
+using System.Data.Entity;
+using System.Data.SqlClient;
+
+namespace WeatherService.Data
+{
+    public class WeatherArchiveData : DbContext
+    {
+        private const string ConnectionStringTemplateName = "WeatherArchiveData";
+        private const string DatabaseNameYearTemplate = "WeatherData{0}";
+
+        private static readonly Dictionary<int, bool> DatabaseExists = new Dictionary<int, bool>();
+
+        private static string BuildConnectionString(int year)
+        {
+            var databaseName = string.Format(DatabaseNameYearTemplate, year);
+
+            var connectionString = ConfigurationManager.ConnectionStrings[ConnectionStringTemplateName].ConnectionString;
+
+            var builder = new SqlConnectionStringBuilder(connectionString) { InitialCatalog = databaseName };
+
+            return builder.ConnectionString;
+        }
+
+        public WeatherArchiveData(int year)
+            : base(BuildConnectionString(year))
+        {
+            if (DatabaseExists.ContainsKey(year))
+                return;
+
+            DatabaseExists[year] = Database.Exists();
+
+            if (DatabaseExists[year])
+                return;
+
+            Database.Create();
+
+            DatabaseExists[year] = true;
+        }
+
+        public virtual DbSet<Reading> Readings { get; set; }
+
+        protected override void OnModelCreating(DbModelBuilder modelBuilder)
+        {
+        }
+    }
+}