Imported Upstream version 5.2.0.179

Former-commit-id: a536d4f20e27294d8bbc2184d75f3a22364f7ba1

external/entityframework/samples/Provider/SampleEntityFrameworkProvider/StoreVersion.cs

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+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+using System;
+
+namespace SampleEntityFrameworkProvider
+{
+    /// <summary>
+    /// This enum describes the current server version
+    /// </summary>
+    internal enum StoreVersion
+    {
+        /// <summary>
+        /// Sql Server 9
+        /// </summary>
+        Sql9 = 90,
+
+        /// <summary>
+        /// Sql Server 10
+        /// </summary>
+        Sql10 = 100,
+
+        // higher versions go here
+    }
+
+    /// <summary>
+    /// This class is a simple utility class that determines the sql version from the 
+    /// connection
+    /// </summary>
+    internal static class StoreVersionUtils
+    {
+        /// <summary>
+        /// Get the StoreVersion from the connection. Returns one of Sql9, Sql10
+        /// </summary>
+        /// <param name="connection">current sql connection</param>
+        /// <returns>Sql Version for the current connection</returns>
+        internal static StoreVersion GetStoreVersion(SampleConnection connection)
+        {
+            // We don't have anything unique for Sql
+            if ((connection.ServerVersion.StartsWith("10.", StringComparison.Ordinal)) || 
+               (connection.ServerVersion.StartsWith("11.", StringComparison.Ordinal)))
+            {
+                return StoreVersion.Sql10;
+            }
+            else if (connection.ServerVersion.StartsWith("09.", StringComparison.Ordinal))
+            {
+                return StoreVersion.Sql9;
+            }
+            else
+            {
+                throw new ArgumentException("The version of SQL Server is not supported via sample provider.");
+            }
+        }
+
+        internal static StoreVersion GetStoreVersion(string providerManifestToken)
+        {
+            switch (providerManifestToken)
+            {
+                case SampleProviderManifest.TokenSql9:
+                    return StoreVersion.Sql9;
+
+                case SampleProviderManifest.TokenSql10:
+                    return StoreVersion.Sql10;
+
+                default:
+                    throw new ArgumentException("Could not determine storage version; a valid provider manifest token is required.");
+            }
+        }
+
+        internal static string GetVersionHint(StoreVersion version)
+        {
+            switch (version)
+            {
+                case StoreVersion.Sql9:
+                    return SampleProviderManifest.TokenSql9;
+
+                case StoreVersion.Sql10:
+                    return SampleProviderManifest.TokenSql10;
+            }
+
+            throw new ArgumentException("Could not determine storage version; a valid storage connection or a version hint is required.");
+        }
+    }
+}