added marr.datamapper source code for easy debugging.

Marr.Data/GroupingKeyCollection.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using Marr.Data.Mapping;
+using System.Data.Common;
+
+namespace Marr.Data
+{
+    public class GroupingKeyCollection : IEnumerable<ColumnMap>
+    {
+        public GroupingKeyCollection()
+        {
+            PrimaryKeys = new ColumnMapCollection();
+            ParentPrimaryKeys = new ColumnMapCollection();
+        }
+
+        public ColumnMapCollection PrimaryKeys { get; private set; }
+        public ColumnMapCollection ParentPrimaryKeys { get; private set; }
+
+        public int Count
+        {
+            get
+            {
+                return PrimaryKeys.Count + ParentPrimaryKeys.Count;
+            }
+        }
+
+        /// <summary>
+        /// Gets the PK values that define this entity in the graph.
+        /// </summary>
+        internal string GroupingKey { get; private set; }
+
+        /// <summary>
+        /// Returns a concatented string containing the primary key values of the current record.
+        /// </summary>
+        /// <param name="reader">The open data reader.</param>
+        /// <returns>Returns the primary key value(s) as a string.</returns>
+        internal KeyGroupInfo CreateGroupingKey(DbDataReader reader)
+        {
+            StringBuilder pkValues = new StringBuilder();
+            bool hasNullValue = false;
+
+            foreach (ColumnMap pkColumn in this)
+            {
+                object pkValue = reader[pkColumn.ColumnInfo.GetColumName(true)];
+
+                if (pkValue == DBNull.Value)
+                    hasNullValue = true;
+
+                pkValues.Append(pkValue.ToString());
+            }
+
+            GroupingKey = pkValues.ToString();
+
+            return new KeyGroupInfo(GroupingKey, hasNullValue);
+        }
+
+        #region IEnumerable<ColumnMap> Members
+
+        public IEnumerator<ColumnMap> GetEnumerator()
+        {
+            foreach (ColumnMap map in ParentPrimaryKeys)
+            {
+                yield return map;
+            }
+
+            foreach (ColumnMap map in PrimaryKeys)
+            {
+                yield return map;
+            }
+        }
+
+        #endregion
+
+        #region IEnumerable Members
+
+        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
+        {
+            return this.GetEnumerator();
+        }
+
+        #endregion
+    }
+}