Add demo

Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/Main.cs

@@ -34,6 +34,7 @@ namespace OrmTest
         }
         public static void Init()
         {
+            UnitOneToOneDefault.Init();
             UValidateExtensions.Init();
             UUtilExtensions.Init();
             UnitDateRange.Init();

Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/UnitOneToOneDefault.cs

@@ -0,0 +1,73 @@
+using SqlSeverTest.UserTestCases;
+using SqlSugar;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace OrmTest
+{
+    internal class UnitOneToOneDefault
+    {
+        public static void Init()
+        {
+            var Db = new SqlSugarScope(new ConnectionConfig()
+            {
+                DbType = DbType.SqlServer,
+                ConnectionString = Config.ConnectionString,
+                IsAutoCloseConnection = true
+            });
+            Db.CodeFirst.InitTables<School, Grade>();
+            Db.DbMaintenance.TruncateTable<School, Grade>();
+            StaticConfig.QueryOneToOneEnableDefaultValue = true;
+            Db.Insertable(new School()
+            {
+                Id = 1,
+                Name = "有导航"
+            }).ExecuteCommand();
+            Db.Insertable(new School()
+            {
+                Id = 2,
+                Name = "无导航"
+            }).ExecuteCommand();
+            Db.Insertable(new Grade()
+            {
+                Name = "b",
+                SchoolId = 1,
+            }).ExecuteCommand();
+      
+            var list = NewUnitTest.Db.Queryable<School>()
+            .Includes(x => x.Grades)
+            .ToList();
+            StaticConfig.QueryOneToOneEnableDefaultValue = false;
+            if (list.First().Grades.Name != "b" || list.Last().Grades.Name != null) throw new Exception("unit error");
+
+            var list2 = NewUnitTest.Db.Queryable<School>()
+            .Includes(x => x.Grades)
+            .ToList();
+            if (list2.First().Grades.Name != "b" || list2.Last().Grades != null) throw new Exception("unit error");
+        }
+
+        [SugarTable("unitSchooldf2adsa222a")]
+
+        public class School
+        {
+            [SqlSugar.SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            public int Id { get; set; }
+            public string Name { get; set; }
+            [Navigate(NavigateType.OneToOne, nameof(Id), nameof(Grade.SchoolId))]
+            public Grade Grades { get; set; } = new OneToOneInitializer<Grade>();
+        }
+        [SugarTable("unitGradedfad33424saa")]
+        public class Grade
+        {
+            [SqlSugar.SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            public int Id { get; set; }
+            public string? Name { get; set; }
+            public int SchoolId { get; set; }
+
+            [SugarColumn(IsNullable = true)]
+            public decimal? a { get; set; }
+        }
+    }
+}