more tests and fixes

SqlMapper.cs

@@ -20,6 +20,14 @@ static SqlMapper()
             typeMap[typeof(int)] = SqlDbType.Int;
             typeMap[typeof(int?)] = SqlDbType.Int;
             typeMap[typeof(string)] = SqlDbType.NVarChar;
+
+            // weird ... I know see: http://msdn.microsoft.com/en-us/library/ms131092.aspx
+            typeMap[typeof(double)] = SqlDbType.Float;
+            typeMap[typeof(double?)] = SqlDbType.Float;
+
+            typeMap[typeof(bool)] = SqlDbType.Bit;
+            typeMap[typeof(bool?)] = SqlDbType.Bit;
+
             typeMap[typeof(Guid)] = SqlDbType.UniqueIdentifier;
             typeMap[typeof(Guid?)] = SqlDbType.UniqueIdentifier;
             typeMap[typeof(int[])] = SqlDbType.Structured;
@@ -106,7 +114,7 @@ public static List<T> ExecuteMapperQuery<T>(this SqlConnection cnn, string sql,
                 object oDeserializer;
                 if (!cachedSerializers.TryGetValue(identity, out oDeserializer))
                 {
-                    if (typeof(T).IsClass)
+                    if (typeof(T).IsClass && typeof(T) != typeof(string))
                     {
                         oDeserializer = GetClassDeserializer<T>(reader);
                     }
@@ -210,12 +218,7 @@ private static SqlDataReader GetReader<T>(SqlConnection cnn, SqlTransaction tran
         private static object GetStructDeserializer<T>(SqlDataReader reader)
         {
             Func<SqlDataReader, T> deserializer = null;
-            var type = typeof(T);
-            if (type == typeof(int))
-            {
-                // yuck boxing 
-                deserializer = r => (T)(object)r.GetInt32(0);
-            }
+            deserializer = r => (T)r.GetValue(0);
             return deserializer;
         }
 

Tests.cs

@@ -45,6 +45,24 @@ public void PassInIntArray()
             AssertEquals(items[2], 3);
         }
 
+
+        public void TestDoubleParam()
+        {
+            AssertEquals(connection.ExecuteMapperQuery<double>("select @d", new { d = 0.1d }).First(), 0.1d);
+        }
+
+        public void TestBoolParam()
+        {
+            AssertEquals(connection.ExecuteMapperQuery<bool>("select @b", new { b = false }).First(), false);
+        }
+
+        public void TestStrings()
+        {
+            var strings = connection.ExecuteMapperQuery<string>(@"select 'a' a union select 'b'").ToList();
+            AssertEquals(strings[0], "a");
+            AssertEquals(strings[1], "b");
+        }
+
         public class Dog
         {
             public int? Age { get; set; }
@@ -61,7 +79,6 @@ public void TestIntSupportsNull()
             AssertEquals(dog.Count(), 1);
             AssertNull(dog.First().Age);
         }
-
         
     }
 }