Initial commit

Data/Database.cs

@@ -0,0 +1,99 @@
+using Common.Debug;
+using System.Collections.Generic;
+using System.Data.Linq;
+using System.Data.SqlServerCe;
+using System.Linq;
+using WeatherService.Values;
+
+namespace WeatherService.Data
+{
+    /// <summary>
+    /// This class manages database connectivity and logging
+    /// </summary>
+    internal static class Database
+    {
+        private static DatabaseContext _databaseContext;
+        private static SqlCeConnection _connection;
+
+        public static void Connect(string databasePath)
+        {
+            _connection = new SqlCeConnection(string.Format("Data Source={0}", databasePath));
+            _connection.Open();
+        }
+
+        public static SqlCeConnection Connection
+        {
+            get
+            {
+                return _connection;
+            }
+        }
+
+        public static void Initialize(string databasePath)
+        {
+            Connect(databasePath);
+
+            // Create a database context
+            _databaseContext = new DatabaseContext(databasePath);
+
+            // Turn on logging if requested
+            if (Settings.Default.LogDatabase)
+                _databaseContext.Log = Tracer.Writer;
+
+            // Create the database engine
+            SqlCeEngine engine = new SqlCeEngine(string.Format("Data Source={0}", databasePath));
+
+            // Check to see if the database exists
+            if (!_databaseContext.DatabaseExists())
+            {
+                // Create the database itself
+                engine.CreateDatabase();
+
+                // Run the creation script                
+                // executeScript(Resources.CreateDatabase);
+            }
+
+            // Compact the database
+            engine.Shrink();
+        }
+
+        public static Table<DeviceData> DeviceTable
+        {
+            get { return _databaseContext.DeviceTable; }
+        }
+
+        public static Table<ReadingData> ReadingTable
+        {
+            get { return _databaseContext.ReadingTable; }
+        }
+
+        public static IEnumerable<DeviceData> DeviceList
+        {
+            get { return from device in DeviceTable select device; }
+        }
+
+        public static IEnumerable<ReadingData> ReadingList(int deviceId)
+        {
+            return from reading in ReadingTable where reading.DeviceId == deviceId select reading;
+        }
+
+        public static IEnumerable<ReadingData> ReadingList(int deviceId, WeatherValueType valueType)
+        {
+            return from reading in ReadingTable where reading.DeviceId == deviceId && reading.Type == valueType select reading;
+        }
+
+        public static void SaveChanges()
+        {
+            _databaseContext.SubmitChanges(ConflictMode.ContinueOnConflict);
+        }
+
+        public static void DiscardChanges()
+        {
+            ChangeSet changeSet = _databaseContext.GetChangeSet();
+
+            _databaseContext.Refresh(RefreshMode.OverwriteCurrentValues, changeSet.Inserts);
+            _databaseContext.Refresh(RefreshMode.OverwriteCurrentValues, changeSet.Deletes);
+            _databaseContext.Refresh(RefreshMode.OverwriteCurrentValues, changeSet.Updates);
+        }
+    }
+}