Update demo

Src/Asp.Net/SqlServerTest/Demo/Demo1_Queryable.cs

@@ -142,7 +142,12 @@ namespace OrmTest
             db.Insertable(new Tree() { Id = 2, Name = "root" }).ExecuteCommand();
             db.Insertable(new Tree() { Id = 22, Name = "child3", ParentId = 2 }).ExecuteCommand();
 
-            var list=db.Queryable<Tree>()
+            // Same property name mapping,Both entities have parentId
+            var list = db.Queryable<Tree>().Mapper(it => it.Parent, it => it.ParentId).ToList();
+
+
+            //If both entities have parentId, I don't want to associate with parentId.
+            var list1 =db.Queryable<Tree>()
                                      //parent=(select * from parent where id=it.parentid)
                                      .Mapper(it=>it.Parent,it=>it.ParentId, it=>it.Parent.Id)
                                      //Child=(select * from parent where ParentId=it.id)
@@ -153,6 +158,28 @@ namespace OrmTest
 
             //one to many
             var list3 = db.Queryable<Order>().Mapper(it => it.Items, it => it.Items.First().OrderId).ToList();
+
+            //many to many
+            db.CodeFirst.InitTables<A, B, ABMapping>();
+
+            db.Insertable(new A() { Name = "A" }).ExecuteCommand();
+            db.Insertable(new B() { Name = "B" }).ExecuteCommand();
+            db.Insertable(new ABMapping() { AId = 1, BId = 1 }).ExecuteCommand();
+
+            var  list4 = db.Queryable<ABMapping>()
+              .Mapper(it => it.A, it => it.AId)
+              .Mapper(it => it.B, it => it.BId).ToList();
+
+            //Manual mode
+            var result = db.Queryable<OrderInfo>().Take(10).Select<ViewOrder>().Mapper((itemModel, cache) =>
+            {
+                var allItems = cache.Get(orderList => {
+                    var allIds = orderList.Select(it => it.Id).ToList();
+                    return db.Queryable<OrderItem>().Where(it => allIds.Contains(it.OrderId)).ToList();//Execute only once
+                });
+                itemModel.Items = allItems.Where(it => it.OrderId==itemModel.Id).ToList();//Every time it's executed
+            }).ToList();
+
             Console.WriteLine("#### End Start ####");
         }
 

Src/Asp.Net/SqlServerTest/Models/Mapper.cs

@@ -28,4 +28,27 @@ namespace OrmTest
         [SugarColumn(IsIgnore = true)]
         public List<OrderItem> Items { get; set; }
     }
+    public class ABMapping
+    {
+        [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int AId { get; set; }
+        public int BId { get; set; }
+        [SugarColumn(IsIgnore = true)]
+        public A A { get; set; }
+        [SugarColumn(IsIgnore = true)]
+        public B B { get; set; }
+
+    }
+    public class A
+    {
+        [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int Id { get; set; }
+        public string Name { get; set; }
+    }
+    public class B
+    {
+        [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int Id { get; set; }
+        public string Name { get; set; }
+    }
 }