Add user test case

Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/CrossDatabase01.cs

@@ -25,7 +25,10 @@ namespace OrmTest
 
             db.GetConnection("OrderDb").Insertable(new Order() { Id = 1, CreateTime = DateTime.Now, Name = "a", Price = 10, CustomId = 1 }).ExecuteCommand();
             db.GetConnection("OrderItemDb").Insertable(new OrderItem() { OrderId = 1, CreateTime = DateTime.Now, Price = 10 }).ExecuteCommand();
-
+           
+            db.Queryable<Order>().AsWithAttr()
+           .LeftJoin<OrderItem>((x, y) => x.Id == y.OrderId)
+           .ToList();
 
             db.Queryable<Order>()
                 .Select(it => new { 

Src/Asp.NetCore2/SqlSeverTest/UserTestCases/UnitTest/CrossDatabase03.cs

@@ -0,0 +1,66 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using SqlSugar;
+using System.Linq;
+namespace OrmTest
+{
+    public class CrossDatabase03
+    {
+        public static void Init()
+        {
+            var db = new SqlSugarClient(new List<ConnectionConfig>()
+            {
+                new ConnectionConfig(){ConfigId="OrderDb",DbType=DbType.SqlServer,ConnectionString="server=.;uid=sa;pwd=sasa;database=SQLSUGAR4XTEST.a",IsAutoCloseConnection=true},
+                new ConnectionConfig(){ConfigId="OrderItemDb",DbType=DbType.SqlServer,ConnectionString="server=.;uid=sa;pwd=sasa;database=SQLSUGAR4XTEST2.a",IsAutoCloseConnection=true  }
+            });
+            db.GetConnection("OrderDb").DbMaintenance.CreateDatabase();
+            db.GetConnection("OrderItemDb").DbMaintenance.CreateDatabase();
+            db.Aop.OnLogExecuting = (sql, p) =>Console.WriteLine( UtilMethods.GetNativeSql(sql, p));
+
+            db.GetConnection("OrderDb").CodeFirst.InitTables<Order>();
+            db.GetConnection("OrderItemDb").CodeFirst.InitTables<OrderItem>();
+
+            db.GetConnection("OrderDb").DbMaintenance.TruncateTable<Order>();
+            db.GetConnection("OrderItemDb").DbMaintenance.TruncateTable<OrderItem>();
+
+            db.GetConnection("OrderDb").Insertable(new Order() { Id = 1, CreateTime = DateTime.Now, Name = "a", Price = 10, CustomId = 1 }).ExecuteCommand();
+            db.GetConnection("OrderItemDb").Insertable(new OrderItem() { OrderId = 1, CreateTime = DateTime.Now, Price = 10 }).ExecuteCommand();
+
+
+            db.Queryable<Order>().AsWithAttr()
+                .LeftJoin<OrderItem>((x,y)=>x.Id==y.OrderId)
+                .ToList();
+    
+        }
+        [SqlSugar.Tenant("OrderDb")]
+        [SqlSugar.SugarTable("Order8")]
+        public class Order
+        {
+            [SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            public int Id { get; set; }
+
+            public string Name { get; set; }
+            public decimal Price { get; set; }
+            [SugarColumn(IsNullable = true)]
+            public DateTime CreateTime { get; set; }
+            [SugarColumn(IsNullable = true)]
+            public int CustomId { get; set; }
+            [Navigate(NavigateType.OneToMany, nameof(OrderItem.OrderId))]
+            public List<OrderItem> Items { get; set; }
+        }
+        [SqlSugar.SugarTable("OrderDetail8")]
+        [SqlSugar.Tenant("OrderItemDb")]
+        public class OrderItem
+        {
+            [SqlSugar.SugarColumn(IsPrimaryKey = true, IsIdentity = true)]
+            public int ItemId { get; set; }
+            public int OrderId { get; set; }
+            public decimal? Price { get; set; }
+            [SqlSugar.SugarColumn(IsNullable = true)]
+            public DateTime? CreateTime { get; set; }
+            [Navigate(NavigateType.OneToOne, nameof(OrderId))]
+            public Order Order { get; set; }
+        }
+    }
+}

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

@@ -33,6 +33,7 @@ namespace OrmTest
         }
         public static void Init()
         {
+            CrossDatabase03.Init();
             CrossDatabase02.Init();
             UnitDynamicCoread12321.Init();
             UnitManyToManyadfafa.Init();