Add declarative procedure result-set binding

AmalgamationTool/DynamORM.Amalgamation.cs

@@ -10,6 +10,7 @@ using DynamORM.Builders;
 using DynamORM.Helpers.Dynamics;
 using DynamORM.Helpers;
 using DynamORM.Mapper;
+using DynamORM.Objects;
 using DynamORM.TypedSql;
 using DynamORM.Validation;
 using System.Collections.Concurrent;
@@ -5541,7 +5542,7 @@ namespace DynamORM
 
                 object mainResult = null;
 
-                if (types.Count == 0 && DynamicProcedureResultBinder.CanReadResults(declaredResultType))
+                if (types.Count == 0 && DynamicProcedureResultBinder.HasDeclaredResultBinding(declaredResultType))
                 {
                     using (IDataReader rdr = cmd.ExecuteReader())
                     using (IDataReader cache = rdr.CachedReader())
@@ -6849,70 +6850,6 @@ namespace DynamORM
 
         #endregion IExtendedDisposable Members
     }
-    /// <summary>Marks an object as an explicit stored procedure parameter contract.</summary>
-    public interface IProcedureParameters
-    {
-    }
-    /// <summary>Marks an object as a stored procedure parameter contract with a declared typed result model.</summary>
-    /// <typeparam name="TResult">Typed result model.</typeparam>
-    public interface IProcedureParameters<TResult> : IProcedureParameters
-    {
-    }
-    /// <summary>Allows typed procedure result models to consume multiple result sets directly.</summary>
-    public interface IProcedureResultReader
-    {
-        /// <summary>Reads all required result sets from the procedure reader.</summary>
-        /// <param name="reader">Procedure result reader, usually a cached reader.</param>
-        void ReadResults(IDataReader reader);
-    }
-    /// <summary>Declares metadata for object-based stored procedure parameters.</summary>
-    [AttributeUsage(AttributeTargets.Property)]
-    public class ProcedureParameterAttribute : ColumnAttribute
-    {
-        /// <summary>Sentinel used when database type was not provided.</summary>
-        public const int UnspecifiedDbType = -1;
-
-        /// <summary>Sentinel used when size was not provided.</summary>
-        public const int UnspecifiedSize = -1;
-
-        /// <summary>Sentinel used when precision or scale was not provided.</summary>
-        public const byte UnspecifiedByte = byte.MaxValue;
-
-        /// <summary>Gets or sets parameter direction. Defaults to input.</summary>
-        public ParameterDirection Direction { get; set; }
-
-        /// <summary>Gets or sets explicit parameter order. Lower values are emitted first.</summary>
-        public int Order { get; set; }
-
-        /// <summary>Gets or sets parameter database type.</summary>
-        public DbType DbType { get; set; }
-
-        /// <summary>Gets or sets parameter size.</summary>
-        public new int Size { get; set; }
-
-        /// <summary>Gets or sets parameter precision.</summary>
-        public new byte Precision { get; set; }
-
-        /// <summary>Gets or sets parameter scale.</summary>
-        public new byte Scale { get; set; }
-
-        /// <summary>Initializes a new instance of the <see cref="ProcedureParameterAttribute"/> class.</summary>
-        public ProcedureParameterAttribute()
-        {
-            Direction = ParameterDirection.Input;
-            Order = int.MaxValue;
-            DbType = (DbType)UnspecifiedDbType;
-            Size = UnspecifiedSize;
-            Precision = UnspecifiedByte;
-            Scale = UnspecifiedByte;
-        }
-        /// <summary>Initializes a new instance of the <see cref="ProcedureParameterAttribute"/> class.</summary>
-        public ProcedureParameterAttribute(string name)
-            : this()
-        {
-            Name = name;
-        }
-    }
     namespace Builders
     {
             /// <summary>Typed join kind used by typed fluent builder APIs.</summary>
@@ -14627,6 +14564,11 @@ namespace DynamORM
             }
             internal static class DynamicProcedureResultBinder
             {
+                private sealed class ResultPropertyBinding
+                {
+                    public ProcedureResultAttribute Attribute { get; set; }
+                    public PropertyInfo Property { get; set; }
+                }
                 internal static bool IsProcedureContract(object item)
                 {
                     return item is IProcedureParameters;
@@ -14641,9 +14583,10 @@ namespace DynamORM
 
                     return iface == null ? null : iface.GetGenericArguments()[0];
                 }
-                internal static bool CanReadResults(Type resultType)
+                internal static bool HasDeclaredResultBinding(Type resultType)
                 {
-                    return resultType != null && typeof(IProcedureResultReader).IsAssignableFrom(resultType);
+                    return resultType != null &&
+                        (typeof(IProcedureResultReader).IsAssignableFrom(resultType) || GetResultPropertyBindings(resultType).Count > 0);
                 }
                 internal static object CreateDeclaredResult(Type resultType)
                 {
@@ -14658,11 +14601,17 @@ namespace DynamORM
                 }
                 internal static object ReadDeclaredResult(Type resultType, IDataReader reader)
                 {
-                    if (!CanReadResults(resultType))
-                        throw new InvalidOperationException(string.Format("Type '{0}' does not implement IProcedureResultReader.", resultType == null ? "<null>" : resultType.FullName));
+                    if (!HasDeclaredResultBinding(resultType))
+                        throw new InvalidOperationException(string.Format("Type '{0}' does not declare a supported procedure result binding.", resultType == null ? "<null>" : resultType.FullName));
 
                     object instance = CreateDeclaredResult(resultType);
+
+                    IList<ResultPropertyBinding> bindings = GetResultPropertyBindings(resultType);
+                    if (bindings.Count > 0)
+                        BindResultProperties(instance, reader, bindings);
+                    else
                         ((IProcedureResultReader)instance).ReadResults(reader);
+
                     return instance;
                 }
                 internal static object BindPayload(Type resultType, string mainResultName, object mainResult, IDictionary<string, object> returnValues, object existing = null)
@@ -14688,6 +14637,210 @@ namespace DynamORM
 
                     return payload.ToDynamic();
                 }
+                private static IList<ResultPropertyBinding> GetResultPropertyBindings(Type resultType)
+                {
+                    return resultType.GetProperties(BindingFlags.Instance | BindingFlags.Public)
+                        .Where(x => x.CanWrite && x.GetIndexParameters().Length == 0)
+                        .Select(x => new ResultPropertyBinding
+                        {
+                            Property = x,
+                            Attribute = x.GetCustomAttributes(typeof(ProcedureResultAttribute), true).Cast<ProcedureResultAttribute>().FirstOrDefault()
+                        })
+                        .Where(x => x.Attribute != null)
+                        .OrderBy(x => x.Attribute.ResultIndex)
+                        .ThenBy(x => x.Property.MetadataToken)
+                        .ToList();
+                }
+                private static void BindResultProperties(object instance, IDataReader reader, IList<ResultPropertyBinding> bindings)
+                {
+                    ValidateBindings(instance.GetType(), bindings);
+
+                    int currentIndex = 0;
+                    bool hasCurrent = true;
+
+                    for (int i = 0; i < bindings.Count; i++)
+                    {
+                        ResultPropertyBinding binding = bindings[i];
+                        while (hasCurrent && currentIndex < binding.Attribute.ResultIndex)
+                        {
+                            hasCurrent = reader.NextResult();
+                            currentIndex++;
+                        }
+                        if (!hasCurrent || currentIndex != binding.Attribute.ResultIndex)
+                            break;
+
+                        object value = ReadResultValue(binding.Property.PropertyType, binding.Attribute, reader);
+                        binding.Property.SetValue(instance, value, null);
+
+                        if (i + 1 < bindings.Count)
+                        {
+                            hasCurrent = reader.NextResult();
+                            currentIndex++;
+                        }
+                    }
+                }
+                private static void ValidateBindings(Type resultType, IList<ResultPropertyBinding> bindings)
+                {
+                    var duplicates = bindings.GroupBy(x => x.Attribute.ResultIndex).FirstOrDefault(x => x.Count() > 1);
+                    if (duplicates != null)
+                        throw new InvalidOperationException(string.Format("Type '{0}' defines multiple ProcedureResultAttribute bindings for result index {1}.", resultType.FullName, duplicates.Key));
+                }
+                private static object ReadResultValue(Type propertyType, ProcedureResultAttribute attr, IDataReader reader)
+                {
+                    Type elementType;
+
+                    if (propertyType == typeof(DataTable))
+                        return reader.ToDataTable(string.IsNullOrEmpty(attr.Name) ? null : attr.Name);
+
+                    if (TryGetEnumerableElementType(propertyType, out elementType))
+                    {
+                        if (elementType == typeof(object))
+                            return reader.EnumerateReader().ToList();
+
+                        if (elementType.IsValueType || elementType == typeof(string) || elementType == typeof(Guid))
+                            return ReadSimpleList(propertyType, elementType, attr, reader);
+
+                        return ReadComplexList(propertyType, elementType, reader);
+                    }
+                    if (propertyType.IsValueType || propertyType == typeof(string) || propertyType == typeof(Guid))
+                        return ReadSimpleValue(propertyType, attr, reader);
+
+                    return ReadComplexValue(propertyType, reader);
+                }
+                private static object ReadSimpleValue(Type propertyType, ProcedureResultAttribute attr, IDataReader reader)
+                {
+                    object value = null;
+                    int ordinal = -1;
+                    bool haveRow = false;
+
+                    while (reader.Read())
+                    {
+                        if (!haveRow)
+                        {
+                            ordinal = GetOrdinal(reader, attr);
+                            value = reader.IsDBNull(ordinal) ? null : reader[ordinal];
+                            haveRow = true;
+                        }
+                    }
+                    if (!haveRow || value == null)
+                        return propertyType.GetDefaultValue();
+
+                    if (propertyType == typeof(Guid))
+                    {
+                        Guid g;
+                        if (Guid.TryParse(value.ToString(), out g))
+                            return g;
+                        return propertyType.GetDefaultValue();
+                    }
+                    return propertyType.CastObject(value);
+                }
+                private static object ReadSimpleList(Type propertyType, Type elementType, ProcedureResultAttribute attr, IDataReader reader)
+                {
+                    Type listType = typeof(List<>).MakeGenericType(elementType);
+                    var list = (System.Collections.IList)Activator.CreateInstance(listType);
+                    int ordinal = -1;
+                    bool initialized = false;
+
+                    while (reader.Read())
+                    {
+                        if (!initialized)
+                        {
+                            ordinal = GetOrdinal(reader, attr);
+                            initialized = true;
+                        }
+                        if (reader.IsDBNull(ordinal))
+                        {
+                            list.Add(elementType.GetDefaultValue());
+                            continue;
+                        }
+                        object value = reader[ordinal];
+                        if (elementType == typeof(Guid))
+                        {
+                            Guid g;
+                            list.Add(Guid.TryParse(value.ToString(), out g) ? (object)g : elementType.GetDefaultValue());
+                        }
+                        else
+                            list.Add(elementType.CastObject(value));
+                    }
+                    if (propertyType.IsArray)
+                    {
+                        Array array = Array.CreateInstance(elementType, list.Count);
+                        list.CopyTo(array, 0);
+                        return array;
+                    }
+                    return list;
+                }
+                private static object ReadComplexValue(Type propertyType, IDataReader reader)
+                {
+                    object value = null;
+                    bool haveRow = false;
+
+                    while (reader.Read())
+                    {
+                        if (!haveRow)
+                        {
+                            value = (reader.RowToDynamic() as object).Map(propertyType);
+                            haveRow = true;
+                        }
+                    }
+                    return value;
+                }
+                private static object ReadComplexList(Type propertyType, Type elementType, IDataReader reader)
+                {
+                    Type listType = typeof(List<>).MakeGenericType(elementType);
+                    var list = (System.Collections.IList)Activator.CreateInstance(listType);
+
+                    while (reader.Read())
+                        list.Add((reader.RowToDynamic() as object).Map(elementType));
+
+                    if (propertyType.IsArray)
+                    {
+                        Array array = Array.CreateInstance(elementType, list.Count);
+                        list.CopyTo(array, 0);
+                        return array;
+                    }
+                    return list;
+                }
+                private static bool TryGetEnumerableElementType(Type type, out Type elementType)
+                {
+                    elementType = null;
+
+                    if (type == typeof(string) || type == typeof(byte[]))
+                        return false;
+
+                    if (type.IsArray)
+                    {
+                        elementType = type.GetElementType();
+                        return true;
+                    }
+                    if (type.IsGenericType)
+                    {
+                        Type generic = type.GetGenericTypeDefinition();
+                        if (generic == typeof(List<>) || generic == typeof(IList<>) || generic == typeof(IEnumerable<>))
+                        {
+                            elementType = type.GetGenericArguments()[0];
+                            return true;
+                        }
+                    }
+                    Type enumerableInterface = type.GetInterfaces().FirstOrDefault(x => x.IsGenericType && x.GetGenericTypeDefinition() == typeof(IEnumerable<>));
+                    if (enumerableInterface != null)
+                    {
+                        elementType = enumerableInterface.GetGenericArguments()[0];
+                        return true;
+                    }
+                    return false;
+                }
+                private static int GetOrdinal(IDataReader reader, ProcedureResultAttribute attr)
+                {
+                    if (attr == null || string.IsNullOrEmpty(attr.ColumnName))
+                        return 0;
+
+                    int ordinal = reader.GetOrdinal(attr.ColumnName);
+                    if (ordinal < 0)
+                        throw new IndexOutOfRangeException(attr.ColumnName);
+
+                    return ordinal;
+                }
             }
             /// <summary>Framework detection and specific implementations.</summary>
             public static class FrameworkTools
@@ -17684,6 +17837,72 @@ namespace DynamORM
             public class IgnoreAttribute : Attribute
             {
             }
+            /// <summary>Declares metadata for object-based stored procedure parameters.</summary>
+            [AttributeUsage(AttributeTargets.Property)]
+            public class ProcedureParameterAttribute : ColumnAttribute
+            {
+                /// <summary>Sentinel used when database type was not provided.</summary>
+                public const int UnspecifiedDbType = -1;
+
+                /// <summary>Sentinel used when size was not provided.</summary>
+                public const int UnspecifiedSize = -1;
+
+                /// <summary>Sentinel used when precision or scale was not provided.</summary>
+                public const byte UnspecifiedByte = byte.MaxValue;
+
+                /// <summary>Gets or sets parameter direction. Defaults to input.</summary>
+                public ParameterDirection Direction { get; set; }
+
+                /// <summary>Gets or sets explicit parameter order. Lower values are emitted first.</summary>
+                public int Order { get; set; }
+
+                /// <summary>Gets or sets parameter database type.</summary>
+                public DbType DbType { get; set; }
+
+                /// <summary>Gets or sets parameter size.</summary>
+                public new int Size { get; set; }
+
+                /// <summary>Gets or sets parameter precision.</summary>
+                public new byte Precision { get; set; }
+
+                /// <summary>Gets or sets parameter scale.</summary>
+                public new byte Scale { get; set; }
+
+                /// <summary>Initializes a new instance of the <see cref="ProcedureParameterAttribute"/> class.</summary>
+                public ProcedureParameterAttribute()
+                {
+                    Direction = ParameterDirection.Input;
+                    Order = int.MaxValue;
+                    DbType = (DbType)UnspecifiedDbType;
+                    Size = UnspecifiedSize;
+                    Precision = UnspecifiedByte;
+                    Scale = UnspecifiedByte;
+                }
+                /// <summary>Initializes a new instance of the <see cref="ProcedureParameterAttribute"/> class.</summary>
+                public ProcedureParameterAttribute(string name)
+                    : this()
+                {
+                    Name = name;
+                }
+            }
+            /// <summary>Declares mapping of a typed procedure result property to a specific result set.</summary>
+            [AttributeUsage(AttributeTargets.Property)]
+            public class ProcedureResultAttribute : Attribute
+            {
+                /// <summary>Initializes a new instance of the <see cref="ProcedureResultAttribute"/> class.</summary>
+                public ProcedureResultAttribute(int resultIndex)
+                {
+                    ResultIndex = resultIndex;
+                }
+                /// <summary>Gets result-set index in reader order, zero based.</summary>
+                public int ResultIndex { get; private set; }
+
+                /// <summary>Gets or sets optional column name for scalar/simple list extraction.</summary>
+                public string ColumnName { get; set; }
+
+                /// <summary>Gets or sets optional name used for DataTable.</summary>
+                public string Name { get; set; }
+            }
             /// <summary>Allows to add table name to class.</summary>
             [AttributeUsage(AttributeTargets.Class)]
             public class TableAttribute : Attribute
@@ -18131,6 +18350,22 @@ namespace DynamORM
                     _database = null;
                 }
             }
+            /// <summary>Marks an object as an explicit stored procedure parameter contract.</summary>
+            public interface IProcedureParameters
+            {
+            }
+            /// <summary>Marks an object as a stored procedure parameter contract with a declared typed result model.</summary>
+            /// <typeparam name="TResult">Typed result model.</typeparam>
+            public interface IProcedureParameters<TResult> : IProcedureParameters
+            {
+            }
+            /// <summary>Allows typed procedure result models to consume multiple result sets directly.</summary>
+            public interface IProcedureResultReader
+            {
+                /// <summary>Reads all required result sets from the procedure reader.</summary>
+                /// <param name="reader">Procedure result reader, usually a cached reader.</param>
+                void ReadResults(IDataReader reader);
+            }
     }
     namespace TypedSql
     {

DynamORM.Tests/Helpers/ProcedureParameterModels.cs

@@ -68,6 +68,39 @@ namespace DynamORM.Tests.Helpers
         }
     }
 
+    public class ProcedureAttributedResult
+    {
+        [DynamORM.Mapper.Column("sp_Test")]
+        public int MainResult { get; set; }
+
+        [DynamORM.Mapper.Column("status")]
+        public int Status { get; set; }
+
+        [ProcedureResult(0, ColumnName = "Code")]
+        public string FirstCode { get; set; }
+
+        [ProcedureResult(1, ColumnName = "Code")]
+        public System.Collections.Generic.List<string> Codes { get; set; }
+
+        [ProcedureResult(2, ColumnName = "State")]
+        public int[] States { get; set; }
+
+        [ProcedureResult(3)]
+        public Users User { get; set; }
+
+        [ProcedureResult(4)]
+        public System.Collections.Generic.List<Users> AllUsers { get; set; }
+
+        [ProcedureResult(5, Name = "codes_table")]
+        public DataTable CodesTable { get; set; }
+    }
+
+    public class ProcedureAttributedResultArgs : IProcedureParameters<ProcedureAttributedResult>
+    {
+        [ProcedureParameter("status", Direction = ParameterDirection.Output, Order = 1, DbType = DbType.Int32)]
+        public int Status { get; set; }
+    }
+
     public class ProcedureMultiResultArgs : IProcedureParameters<ProcedureMultiResult>
     {
         [ProcedureParameter("status", Direction = ParameterDirection.Output, Order = 1, DbType = DbType.Int32)]

DynamORM.Tests/Procedure/ProcedureParameterBinderTests.cs

@@ -172,6 +172,40 @@ namespace DynamORM.Tests.Procedure
             }
         }
 
+        [Test]
+        public void TestDeclaredResultCanReadAttributedResultSets()
+        {
+            using (var reader = new FakeMultiResultDataReader(
+                Tuple.Create(new[] { "Code" }, new[] { typeof(string) }, new[] { new object[] { "FIRST" }, new object[] { "SECOND" } }),
+                Tuple.Create(new[] { "Code" }, new[] { typeof(string) }, new[] { new object[] { "A" }, new object[] { "B" } }),
+                Tuple.Create(new[] { "State" }, new[] { typeof(int) }, new[] { new object[] { 10 }, new object[] { 20 } }),
+                Tuple.Create(
+                    new[] { "id", "code", "first" },
+                    new[] { typeof(long), typeof(string), typeof(string) },
+                    new[] { new object[] { 1L, "U1", "One" } }),
+                Tuple.Create(
+                    new[] { "id", "code", "first" },
+                    new[] { typeof(long), typeof(string), typeof(string) },
+                    new[] { new object[] { 2L, "U2", "Two" }, new object[] { 3L, "U3", "Three" } }),
+                Tuple.Create(new[] { "Code" }, new[] { typeof(string) }, new[] { new object[] { "X" }, new object[] { "Y" } })))
+            {
+                var result = DynamicProcedureResultBinder.ReadDeclaredResult(typeof(ProcedureAttributedResult), reader) as ProcedureAttributedResult;
+
+                Assert.NotNull(result);
+                Assert.AreEqual("FIRST", result.FirstCode);
+                CollectionAssert.AreEqual(new[] { "A", "B" }, result.Codes);
+                CollectionAssert.AreEqual(new[] { 10, 20 }, result.States);
+                Assert.NotNull(result.User);
+                Assert.AreEqual(1L, result.User.Id);
+                Assert.AreEqual("U1", result.User.Code);
+                Assert.NotNull(result.AllUsers);
+                Assert.AreEqual(2, result.AllUsers.Count);
+                Assert.NotNull(result.CodesTable);
+                Assert.AreEqual("codes_table", result.CodesTable.TableName);
+                Assert.AreEqual(2, result.CodesTable.Rows.Count);
+            }
+        }
+
         [Test]
         public void TestDeclaredResultPayloadCanAugmentReaderResult()
         {
@@ -195,5 +229,13 @@ namespace DynamORM.Tests.Procedure
             CollectionAssert.AreEqual(new[] { "A" }, result.Codes);
             CollectionAssert.AreEqual(new[] { 10 }, result.States);
         }
+
+        [Test]
+        public void TestDeclaredResultBindingDetectionSupportsAttributedResults()
+        {
+            Assert.IsTrue(DynamicProcedureResultBinder.HasDeclaredResultBinding(typeof(ProcedureMultiResult)));
+            Assert.IsTrue(DynamicProcedureResultBinder.HasDeclaredResultBinding(typeof(ProcedureAttributedResult)));
+            Assert.IsFalse(DynamicProcedureResultBinder.HasDeclaredResultBinding(typeof(ProcedureParameterResult)));
+        }
     }
 }

DynamORM/DynamicProcedureInvoker.cs

@@ -282,7 +282,7 @@ namespace DynamORM
 
                 object mainResult = null;
 
-                if (types.Count == 0 && DynamicProcedureResultBinder.CanReadResults(declaredResultType))
+                if (types.Count == 0 && DynamicProcedureResultBinder.HasDeclaredResultBinding(declaredResultType))
                 {
                     using (IDataReader rdr = cmd.ExecuteReader())
                     using (IDataReader cache = rdr.CachedReader())

DynamORM/Helpers/DynamicProcedureResultBinder.cs

@@ -30,6 +30,7 @@ using System;
 using System.Collections.Generic;
 using System.Data;
 using System.Linq;
+using System.Reflection;
 using DynamORM.Mapper;
 using DynamORM.Objects;
 
@@ -37,6 +38,12 @@ namespace DynamORM.Helpers
 {
     internal static class DynamicProcedureResultBinder
     {
+        private sealed class ResultPropertyBinding
+        {
+            public ProcedureResultAttribute Attribute { get; set; }
+            public PropertyInfo Property { get; set; }
+        }
+
         internal static bool IsProcedureContract(object item)
         {
             return item is IProcedureParameters;
@@ -53,9 +60,10 @@ namespace DynamORM.Helpers
             return iface == null ? null : iface.GetGenericArguments()[0];
         }
 
-        internal static bool CanReadResults(Type resultType)
+        internal static bool HasDeclaredResultBinding(Type resultType)
         {
-            return resultType != null && typeof(IProcedureResultReader).IsAssignableFrom(resultType);
+            return resultType != null &&
+                (typeof(IProcedureResultReader).IsAssignableFrom(resultType) || GetResultPropertyBindings(resultType).Count > 0);
         }
 
         internal static object CreateDeclaredResult(Type resultType)
@@ -72,11 +80,17 @@ namespace DynamORM.Helpers
 
         internal static object ReadDeclaredResult(Type resultType, IDataReader reader)
         {
-            if (!CanReadResults(resultType))
-                throw new InvalidOperationException(string.Format("Type '{0}' does not implement IProcedureResultReader.", resultType == null ? "<null>" : resultType.FullName));
+            if (!HasDeclaredResultBinding(resultType))
+                throw new InvalidOperationException(string.Format("Type '{0}' does not declare a supported procedure result binding.", resultType == null ? "<null>" : resultType.FullName));
 
             object instance = CreateDeclaredResult(resultType);
+
+            IList<ResultPropertyBinding> bindings = GetResultPropertyBindings(resultType);
+            if (bindings.Count > 0)
+                BindResultProperties(instance, reader, bindings);
+            else
                 ((IProcedureResultReader)instance).ReadResults(reader);
+
             return instance;
         }
 
@@ -103,5 +117,232 @@ namespace DynamORM.Helpers
 
             return payload.ToDynamic();
         }
+
+        private static IList<ResultPropertyBinding> GetResultPropertyBindings(Type resultType)
+        {
+            return resultType.GetProperties(BindingFlags.Instance | BindingFlags.Public)
+                .Where(x => x.CanWrite && x.GetIndexParameters().Length == 0)
+                .Select(x => new ResultPropertyBinding
+                {
+                    Property = x,
+                    Attribute = x.GetCustomAttributes(typeof(ProcedureResultAttribute), true).Cast<ProcedureResultAttribute>().FirstOrDefault()
+                })
+                .Where(x => x.Attribute != null)
+                .OrderBy(x => x.Attribute.ResultIndex)
+                .ThenBy(x => x.Property.MetadataToken)
+                .ToList();
+        }
+
+        private static void BindResultProperties(object instance, IDataReader reader, IList<ResultPropertyBinding> bindings)
+        {
+            ValidateBindings(instance.GetType(), bindings);
+
+            int currentIndex = 0;
+            bool hasCurrent = true;
+
+            for (int i = 0; i < bindings.Count; i++)
+            {
+                ResultPropertyBinding binding = bindings[i];
+                while (hasCurrent && currentIndex < binding.Attribute.ResultIndex)
+                {
+                    hasCurrent = reader.NextResult();
+                    currentIndex++;
+                }
+
+                if (!hasCurrent || currentIndex != binding.Attribute.ResultIndex)
+                    break;
+
+                object value = ReadResultValue(binding.Property.PropertyType, binding.Attribute, reader);
+                binding.Property.SetValue(instance, value, null);
+
+                if (i + 1 < bindings.Count)
+                {
+                    hasCurrent = reader.NextResult();
+                    currentIndex++;
+                }
+            }
+        }
+
+        private static void ValidateBindings(Type resultType, IList<ResultPropertyBinding> bindings)
+        {
+            var duplicates = bindings.GroupBy(x => x.Attribute.ResultIndex).FirstOrDefault(x => x.Count() > 1);
+            if (duplicates != null)
+                throw new InvalidOperationException(string.Format("Type '{0}' defines multiple ProcedureResultAttribute bindings for result index {1}.", resultType.FullName, duplicates.Key));
+        }
+
+        private static object ReadResultValue(Type propertyType, ProcedureResultAttribute attr, IDataReader reader)
+        {
+            Type elementType;
+
+            if (propertyType == typeof(DataTable))
+                return reader.ToDataTable(string.IsNullOrEmpty(attr.Name) ? null : attr.Name);
+
+            if (TryGetEnumerableElementType(propertyType, out elementType))
+            {
+                if (elementType == typeof(object))
+                    return reader.EnumerateReader().ToList();
+
+                if (elementType.IsValueType || elementType == typeof(string) || elementType == typeof(Guid))
+                    return ReadSimpleList(propertyType, elementType, attr, reader);
+
+                return ReadComplexList(propertyType, elementType, reader);
+            }
+
+            if (propertyType.IsValueType || propertyType == typeof(string) || propertyType == typeof(Guid))
+                return ReadSimpleValue(propertyType, attr, reader);
+
+            return ReadComplexValue(propertyType, reader);
+        }
+
+        private static object ReadSimpleValue(Type propertyType, ProcedureResultAttribute attr, IDataReader reader)
+        {
+            object value = null;
+            int ordinal = -1;
+            bool haveRow = false;
+
+            while (reader.Read())
+            {
+                if (!haveRow)
+                {
+                    ordinal = GetOrdinal(reader, attr);
+                    value = reader.IsDBNull(ordinal) ? null : reader[ordinal];
+                    haveRow = true;
+                }
+            }
+
+            if (!haveRow || value == null)
+                return propertyType.GetDefaultValue();
+
+            if (propertyType == typeof(Guid))
+            {
+                Guid g;
+                if (Guid.TryParse(value.ToString(), out g))
+                    return g;
+                return propertyType.GetDefaultValue();
+            }
+
+            return propertyType.CastObject(value);
+        }
+
+        private static object ReadSimpleList(Type propertyType, Type elementType, ProcedureResultAttribute attr, IDataReader reader)
+        {
+            Type listType = typeof(List<>).MakeGenericType(elementType);
+            var list = (System.Collections.IList)Activator.CreateInstance(listType);
+            int ordinal = -1;
+            bool initialized = false;
+
+            while (reader.Read())
+            {
+                if (!initialized)
+                {
+                    ordinal = GetOrdinal(reader, attr);
+                    initialized = true;
+                }
+
+                if (reader.IsDBNull(ordinal))
+                {
+                    list.Add(elementType.GetDefaultValue());
+                    continue;
+                }
+
+                object value = reader[ordinal];
+                if (elementType == typeof(Guid))
+                {
+                    Guid g;
+                    list.Add(Guid.TryParse(value.ToString(), out g) ? (object)g : elementType.GetDefaultValue());
+                }
+                else
+                    list.Add(elementType.CastObject(value));
+            }
+
+            if (propertyType.IsArray)
+            {
+                Array array = Array.CreateInstance(elementType, list.Count);
+                list.CopyTo(array, 0);
+                return array;
+            }
+
+            return list;
+        }
+
+        private static object ReadComplexValue(Type propertyType, IDataReader reader)
+        {
+            object value = null;
+            bool haveRow = false;
+
+            while (reader.Read())
+            {
+                if (!haveRow)
+                {
+                    value = (reader.RowToDynamic() as object).Map(propertyType);
+                    haveRow = true;
+                }
+            }
+
+            return value;
+        }
+
+        private static object ReadComplexList(Type propertyType, Type elementType, IDataReader reader)
+        {
+            Type listType = typeof(List<>).MakeGenericType(elementType);
+            var list = (System.Collections.IList)Activator.CreateInstance(listType);
+
+            while (reader.Read())
+                list.Add((reader.RowToDynamic() as object).Map(elementType));
+
+            if (propertyType.IsArray)
+            {
+                Array array = Array.CreateInstance(elementType, list.Count);
+                list.CopyTo(array, 0);
+                return array;
+            }
+
+            return list;
+        }
+
+        private static bool TryGetEnumerableElementType(Type type, out Type elementType)
+        {
+            elementType = null;
+
+            if (type == typeof(string) || type == typeof(byte[]))
+                return false;
+
+            if (type.IsArray)
+            {
+                elementType = type.GetElementType();
+                return true;
+            }
+
+            if (type.IsGenericType)
+            {
+                Type generic = type.GetGenericTypeDefinition();
+                if (generic == typeof(List<>) || generic == typeof(IList<>) || generic == typeof(IEnumerable<>))
+                {
+                    elementType = type.GetGenericArguments()[0];
+                    return true;
+                }
+            }
+
+            Type enumerableInterface = type.GetInterfaces().FirstOrDefault(x => x.IsGenericType && x.GetGenericTypeDefinition() == typeof(IEnumerable<>));
+            if (enumerableInterface != null)
+            {
+                elementType = enumerableInterface.GetGenericArguments()[0];
+                return true;
+            }
+
+            return false;
+        }
+
+        private static int GetOrdinal(IDataReader reader, ProcedureResultAttribute attr)
+        {
+            if (attr == null || string.IsNullOrEmpty(attr.ColumnName))
+                return 0;
+
+            int ordinal = reader.GetOrdinal(attr.ColumnName);
+            if (ordinal < 0)
+                throw new IndexOutOfRangeException(attr.ColumnName);
+
+            return ordinal;
+        }
     }
 }

DynamORM/Mapper/ProcedureResultAttribute.cs

@@ -0,0 +1,52 @@
+/*
+ * DynamORM - Dynamic Object-Relational Mapping library.
+ * Copyright (c) 2012-2026, Grzegorz Russek (grzegorz.russek@gmail.com)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+using System;
+
+namespace DynamORM.Mapper
+{
+    /// <summary>Declares mapping of a typed procedure result property to a specific result set.</summary>
+    [AttributeUsage(AttributeTargets.Property)]
+    public class ProcedureResultAttribute : Attribute
+    {
+        /// <summary>Initializes a new instance of the <see cref="ProcedureResultAttribute"/> class.</summary>
+        public ProcedureResultAttribute(int resultIndex)
+        {
+            ResultIndex = resultIndex;
+        }
+
+        /// <summary>Gets result-set index in reader order, zero based.</summary>
+        public int ResultIndex { get; private set; }
+
+        /// <summary>Gets or sets optional column name for scalar/simple list extraction.</summary>
+        public string ColumnName { get; set; }
+
+        /// <summary>Gets or sets optional name used for DataTable.</summary>
+        public string Name { get; set; }
+    }
+}