Add demo

Src/Asp.NetCore2/MongoDbTest/UnitTest/Cases.cs

@@ -16,6 +16,7 @@ namespace MongoDbTest
             QuerySelect.Init();
             QuerySelect2.Init();
             QueryJson.Init();
+            QueryJson2.Init();
             QueryLeftJoin.Init();
             QueryLeftJoin2.Init();
             QueryLeftJoin3.Init();

Src/Asp.NetCore2/MongoDbTest/UnitTest/QueryJson2.cs

@@ -0,0 +1,54 @@
+using MongoDB.Bson.Serialization.Attributes;
+using MongoDB.Bson;
+using SqlSugar.MongoDb;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace MongoDbTest
+{
+    public class QueryJson2
+    {
+        internal static void Init()
+        {
+            var db =  DbHelper.GetNewDb();
+            db.CodeFirst.InitTables<Student>();
+            db.DbMaintenance.TruncateTable<Student>();
+            db.Insertable(new Student()
+            {
+                Age = 1,
+                Book = new Book() { SchoolId = ObjectId.GenerateNewId().ToString() }
+            }).ExecuteCommand();
+            var data = db.Queryable<Student>().First();
+            var list=db.Queryable<Student>().Where(s => s.Book.SchoolId == data.Book.SchoolId).ToList();
+            if (list.Any() == false) Cases.ThrowUnitError();
+        }
+
+        [SqlSugar.SugarTable("UnitStudentdddd1")]
+        public class Student : MongoDbBase
+        {
+            public string Name { get; set; }
+
+            public string SchoolId { get; set; }
+
+            public int Age { get; set; }
+
+            public DateTime CreateDateTime { get; set; }
+
+            [SqlSugar.SugarColumn(IsJson = true)]
+            public Book Book { get; set; }
+        }
+
+        public class Book
+        {
+            [BsonRepresentation(BsonType.ObjectId)]//比普通类多个序列化ObjectId
+            [SqlSugar.SugarColumn(ColumnDataType = nameof(ObjectId))]
+            public string SchoolId { get; set; }
+
+            public decimal BookId { get; set; }
+        }
+    }
+
+}