diff -rupN ..\SubSonic2.2_olde\SubSonic\DataProviders\DataProvider.cs .\SubSonic\DataProviders\DataProvider.cs
--- ..\SubSonic2.2_olde\SubSonic\DataProviders\DataProvider.cs	Mon Jul 20 17:18:10 2009
+++ .\SubSonic\DataProviders\DataProvider.cs	Thu May 27 14:22:47 2010
@@ -855,6 +855,43 @@ namespace SubSonic
             return null;
         }
 
+        private static Dictionary<Type, DbType> dbTypeMap = InitDbTypeMap();
+
+        private static Dictionary<Type, DbType> InitDbTypeMap()
+        {
+            Dictionary<Type, DbType> dbTypeMap = new Dictionary<Type, DbType>();
+
+            dbTypeMap.Add(typeof(bool), DbType.Boolean);
+            dbTypeMap.Add(typeof(byte), DbType.Byte);
+            dbTypeMap.Add(typeof(byte[]), DbType.Binary);
+            dbTypeMap.Add(typeof(DateTime), DbType.DateTime);
+            dbTypeMap.Add(typeof(Decimal), DbType.Decimal);
+            dbTypeMap.Add(typeof(double), DbType.Double);
+            dbTypeMap.Add(typeof(float), DbType.Single);
+            dbTypeMap.Add(typeof(Guid), DbType.Guid);
+            dbTypeMap.Add(typeof(Int16), DbType.Int16);
+            dbTypeMap.Add(typeof(Int32), DbType.Int32);
+            dbTypeMap.Add(typeof(Int64), DbType.Int64);
+            dbTypeMap.Add(typeof(object), DbType.Object);
+            dbTypeMap.Add(typeof(string), DbType.String);
+            dbTypeMap.Add(typeof(TimeSpan), DbType.Time);
+            dbTypeMap.Add(typeof(UInt16), DbType.UInt16);
+            dbTypeMap.Add(typeof(UInt32), DbType.UInt32);
+            dbTypeMap.Add(typeof(UInt64), DbType.UInt64);
+
+            return dbTypeMap;
+        }
+
+        public DbType GetDbType(Type dataType)
+        {
+            DbType result;
+            if (dbTypeMap.TryGetValue(dataType, out result))
+            {
+                return result;
+            }
+            return DbType.AnsiString;
+        }
+
         /// <summary>
         /// Gets the type of the db.
         /// </summary>
diff -rupN ..\SubSonic2.2_olde\SubSonic\SqlQuery\InlineQuery.cs .\SubSonic\SqlQuery\InlineQuery.cs
--- ..\SubSonic2.2_olde\SubSonic\SqlQuery\InlineQuery.cs	Mon Jul 20 17:18:10 2009
+++ .\SubSonic\SqlQuery\InlineQuery.cs	Wed Jun 02 10:56:43 2010
@@ -275,7 +275,7 @@ namespace SubSonic
             int indexer = 0;
             foreach(string s in paramList)
             {
-                command.Parameters.Add(s, values[indexer]);
+                command.Parameters.Add(s, values[indexer], command.Provider.GetDbType(values[indexer].GetType()));
                 indexer++;
             }
         }