Update .net core

Src/Asp.NetCore2/SqlSugar/Realization/SqlServer/DbMaintenance/SqlServerDbMaintenance.cs

@@ -331,10 +331,17 @@ namespace SqlSugar
                     return result > 0;
                 }
             }
-            else
+            else if (isCache)
             {
                 return base.IsAnyTable(tableName, isCache);
             }
+            else 
+            {
+                var sql = @"IF EXISTS (SELECT * FROM sys.objects
+                        WHERE type='u' AND name='"+tableName.ToSqlFilter()+@"')  
+                        SELECT 1 AS res ELSE SELECT 0 AS res;";
+                return this.Context.Ado.GetInt(sql) > 0;
+            }
         }
         public List<string> GetSchemas()
         {