added marr.datamapper source code for easy debugging.

Marr.Data/QGen/JoinBuilder.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Data.Common;
+using Marr.Data.QGen.Dialects;
+using System.Linq.Expressions;
+
+namespace Marr.Data.QGen
+{
+    /// <summary>
+    /// This class overrides the WhereBuilder which utilizes the ExpressionVisitor base class, 
+    /// and it is responsible for translating the lambda expression into a "JOIN ON" clause.
+    /// It populates the protected string builder, which outputs the "JOIN ON" clause when the ToString method is called.
+    /// </summary>
+    /// <typeparam name="T">The entity that is on the left side of the join.</typeparam>
+    /// <typeparam name="T2">The entity that is on the right side of the join.</typeparam>
+    public class JoinBuilder<T, T2> : WhereBuilder<T>
+    {
+        public JoinBuilder(DbCommand command, Dialect dialect, Expression<Func<T, T2, bool>> filter, TableCollection tables)
+            : base(command, dialect, filter.Body, tables, false, true)
+        { }
+
+        protected override string PrefixText
+        {
+            get
+            {
+                return "ON";
+            }
+        }
+
+        protected override Expression VisitMemberAccess(MemberExpression expression)
+        {
+            string fqColumn = GetFullyQualifiedColumnName(expression.Member, expression.Expression.Type);
+            _sb.Append(fqColumn);
+            return expression;
+        }
+    }
+}