--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Source/Data/Linq/CompiledTableT.cs	Thu Mar 27 21:46:09 2014 +0400
@@ -0,0 +1,96 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
+
+namespace BLToolkit.Data.Linq
+{
+	using Mapping;
+	using Builder;
+
+	class CompiledTable<T>
+	{
+		public CompiledTable(LambdaExpression lambda, Expression expression)
+		{
+			_lambda     = lambda;
+			_expression = expression;
+		}
+
+		readonly LambdaExpression _lambda;
+		readonly Expression       _expression;
+		readonly object           _sync = new object();
+
+		string        _lastContextID;
+		MappingSchema _lastMappingSchema;
+		Query<T>      _lastQuery;
+
+		readonly Dictionary<object,Query<T>> _infos = new Dictionary<object, Query<T>>();
+
+		Query<T> GetInfo(IDataContext dataContext)
+		{
+			var dataContextInfo = DataContextInfo.Create(dataContext);
+
+			string        lastContextID;
+			MappingSchema lastMappingSchema;
+			Query<T>      query;
+
+			lock (_sync)
+			{
+				lastContextID     = _lastContextID;
+				lastMappingSchema = _lastMappingSchema;
+				query             = _lastQuery;
+			}
+
+			var contextID     = dataContextInfo.ContextID;
+			var mappingSchema = dataContextInfo.MappingSchema;
+
+			if (lastContextID != contextID || lastMappingSchema != mappingSchema)
+				query = null;
+
+			if (query == null)
+			{
+				var key = new { contextID, mappingSchema };
+
+				lock (_sync)
+					_infos.TryGetValue(key, out query);
+
+				if (query == null)
+				{
+					lock (_sync)
+					{
+						_infos.TryGetValue(key, out query);
+
+						if (query == null)
+						{
+							query = new ExpressionBuilder(new Query<T>(), dataContextInfo, _expression, _lambda.Parameters.ToArray())
+								.Build<T>();
+
+							_infos.Add(key, query);
+
+							_lastContextID     = contextID;
+							_lastMappingSchema = mappingSchema;
+							_lastQuery         = query;
+						}
+					}
+				}
+			}
+
+			return query;
+		}
+
+		public IQueryable<T> Create(object[] parameters)
+		{
+			var db = (IDataContext)parameters[0];
+			return new Table<T>(db, _expression) { Info = GetInfo(db), Parameters = parameters };
+		}
+
+		public T Execute(object[] parameters)
+		{
+			var db    = (IDataContext)parameters[0];
+			var ctx   = DataContextInfo.Create(db);
+			var query = GetInfo(db);
+
+			return (T)query.GetElement(null, ctx, _expression, parameters);
+		}
+	}
+}