Add user test case

Src/Asp.NetCore2/PgSqlTest/UserTestCases/Main.cs

@@ -31,6 +31,7 @@ namespace OrmTest
         }
         public static void Init()
         {
+            UnitTestOneToOne.Init();
             Unitadfafafasd.Init();
             UnitSubToList.Init();
             Unit001.Init();

Src/Asp.NetCore2/PgSqlTest/UserTestCases/UnitLeftJoinadfafa1.cs

@@ -0,0 +1,87 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Drawing;
+using SqlSugar;
+namespace OrmTest
+{ 
+    public class UnitTestOneToOne
+    {
+        public static void Init()
+        {
+            var db = NewUnitTest.Db;
+            db.CurrentConnectionConfig.MoreSettings = new ConnMoreSettings()
+            {
+                PgSqlIsAutoToLower = false,
+                PgSqlIsAutoToLowerCodeFirst = false,
+            };
+            db.CodeFirst.InitTables<UnitSale, UnitBackSale>();
+            db.DbMaintenance.TruncateTable<UnitSale, UnitBackSale>();
+
+            for (int i = 0; i < 100; i++)
+            {
+                var sale = new UnitSale
+                {
+                    Name = $"UnitSale{i}",
+                    IsOn = true,
+                };
+                int saleId = db.Insertable(sale).ExecuteReturnIdentity();
+
+                var listBacksale = new List<UnitBackSale> {
+                    new() {
+                        Name = $"UnitBackSale{i}",
+                        IsOn = true,
+                        SaleId = saleId,
+                        Money = i + new Random(DateTime.Now.Millisecond).NextDouble()
+                    },
+                    new() {
+                        Name = $"UnitBackSale{i}",
+                        IsOn = false,
+                        SaleId = saleId,
+                        Money = i + new Random(DateTime.Now.Millisecond).NextDouble()
+                    }
+                };
+                int result = db.Insertable(listBacksale).ExecuteCommand();
+            };
+
+            var total = db.Queryable<UnitSale>()
+                .IncludeLeftJoin(x => x.BackSale)
+                .Where(x => x.BackSale.IsOn == true)
+                .Sum(x => x.BackSale.Money); 
+        }
+
+
+    }
+    public static class SqlSugarExtension
+    {
+        public static List<T> Where<T>(this T thisValue, Func<T, bool> whereExpression) where T : class, new()
+        {
+            return new List<T>() { thisValue };
+        }
+    }
+    public class UnitSale
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int Id { get; set; }
+        public string Name { get; set; }
+        public bool IsOn { get; set; }
+
+
+        [Navigate(NavigateType.OneToOne, nameof(Id), nameof(UnitBackSale.SaleId))]
+        public UnitBackSale BackSale { get; set; }
+    }
+
+    public class UnitBackSale
+    {
+        [SqlSugar.SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+        public int Id { get; set; }
+        public int SaleId { get; set; }
+        public string Name { get; set; }
+        public bool IsOn { get; set; }
+        public double Money { get; set; }
+    }
+}
+
+