Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.Entity/System/Data/SqlClient/SqlVersion.cs

@@ -0,0 +1,113 @@
+//---------------------------------------------------------------------
+// <copyright file="SqlVersion.cs" company="Microsoft">
+//      Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//
+// @owner  [....]
+// @backupOwner [....]
+//---------------------------------------------------------------------
+
+namespace System.Data.SqlClient
+{
+    using System.Data;
+    using System.Data.Entity;
+    using System.Globalization;
+
+    /// <summary>
+    /// This enum describes the current server version
+    /// </summary>
+    internal enum SqlVersion
+    {
+        /// <summary>
+        /// Sql Server 8
+        /// </summary>
+        Sql8 = 80,
+
+        /// <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 SqlVersionUtils
+    {
+        /// <summary>
+        /// Get the SqlVersion from the connection. Returns one of Sql8, Sql9, Sql10
+        /// The passed connection must be open
+        /// </summary>
+        /// <param name="connection">current sql connection</param>
+        /// <returns>Sql Version for the current connection</returns>
+        internal static SqlVersion GetSqlVersion(SqlConnection connection)
+        {
+            System.Diagnostics.Debug.Assert(connection.State == ConnectionState.Open, "Expected an open connection");
+            int majorVersion = Int32.Parse(connection.ServerVersion.Substring(0, 2), CultureInfo.InvariantCulture);
+            if (majorVersion >= 10) 
+            {
+                return SqlVersion.Sql10;
+            }
+            else if (majorVersion == 9)
+            {
+                return SqlVersion.Sql9;
+            }
+            else
+            {
+                System.Diagnostics.Debug.Assert(majorVersion == 8, "not version 8");
+                return SqlVersion.Sql8;
+            }
+        }
+
+        internal static string GetVersionHint(SqlVersion version)
+        {
+            switch(version)
+            {
+                case SqlVersion.Sql8:
+                    return SqlProviderManifest.TokenSql8;
+
+                case SqlVersion.Sql9:
+                    return SqlProviderManifest.TokenSql9;
+
+                case SqlVersion.Sql10:
+                    return SqlProviderManifest.TokenSql10;
+
+                default:
+                    throw EntityUtil.Argument(Strings.UnableToDetermineStoreVersion);
+            }
+        }
+
+        internal static SqlVersion GetSqlVersion(string versionHint)
+        {
+            if (!string.IsNullOrEmpty(versionHint))
+            {
+                switch (versionHint)
+                {
+                    case SqlProviderManifest.TokenSql8:
+                        return SqlVersion.Sql8;
+
+                    case SqlProviderManifest.TokenSql9:
+                        return SqlVersion.Sql9;
+
+                    case SqlProviderManifest.TokenSql10:
+                        return SqlVersion.Sql10;
+                }
+            }
+            
+            throw EntityUtil.Argument(Strings.UnableToDetermineStoreVersion);
+        }
+
+        internal static bool IsPreKatmai(SqlVersion sqlVersion)
+        {
+            return sqlVersion == SqlVersion.Sql8 || sqlVersion == SqlVersion.Sql9;
+        }
+    }
+}