diff --git a/Src/Asp.NetCore2/SqlSeverTest/MySqlTest/Demos/1_Query.cs b/Src/Asp.NetCore2/SqlSeverTest/MySqlTest/Demos/1_Query.cs
index 80a06df73..2a241fbef 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/MySqlTest/Demos/1_Query.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/MySqlTest/Demos/1_Query.cs
@@ -159,7 +159,7 @@ namespace OrmTest.Demo
             var getNew = db.Queryable<Student>().Where(it => it.Id == 1).Select(it => new { id = SqlFunc.IIF(it.Id == 0, 1, it.Id), it.Name, it.SchoolId }).ToList();
             var getAllNoLock = db.Queryable<Student>().With(SqlWith.NoLock).ToList();
             var getByPrimaryKey = db.Queryable<Student>().InSingle(2);
-            var getSingleOrDefault = db.Queryable<Student>().Single();
+            var getSingleOrDefault = db.Queryable<Student>().Where(it => it.Id == 1).Single();
             var getFirstOrDefault = db.Queryable<Student>().First();
             var getByWhere = db.Queryable<Student>().Where(it => it.Id == 1 || it.Name == "a").ToList();
             var getByFuns = db.Queryable<Student>().Where(it => SqlFunc.IsNullOrEmpty(it.Name)).ToList();
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSeverTest/Demos/1_Query.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSeverTest/Demos/1_Query.cs
index b41c72ec3..230bc5649 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSeverTest/Demos/1_Query.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSeverTest/Demos/1_Query.cs
@@ -160,7 +160,7 @@ namespace OrmTest.Demo
             var getNew = db.Queryable<Student>().Where(it => it.Id == 1).Select(it => new { id = SqlFunc.IIF(it.Id == 0, 1, it.Id), it.Name, it.SchoolId }).ToList();
             var getAllNoLock = db.Queryable<Student>().With(SqlWith.NoLock).ToList();
             var getByPrimaryKey = db.Queryable<Student>().InSingle(2);
-            var getSingleOrDefault = db.Queryable<Student>().Single();
+            var getSingleOrDefault = db.Queryable<Student>().Where(it=>it.Id==1).Single();
             var getFirstOrDefault = db.Queryable<Student>().First();
             var getByWhere = db.Queryable<Student>().Where(it => it.Id == 1 || it.Name == "a").ToList();
             var getByFuns = db.Queryable<Student>().Where(it => SqlFunc.IsNullOrEmpty(it.Name)).ToList();
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/DeleteProvider/DeleteableProvider.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/DeleteProvider/DeleteableProvider.cs
index d997196b1..aa0c2183f 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/DeleteProvider/DeleteableProvider.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/DeleteProvider/DeleteableProvider.cs
@@ -30,6 +30,15 @@ namespace SqlSugar
             RestoreMapping();
             return Db.ExecuteCommand(sql, paramters);
         }
+        public Task<int> ExecuteCommandAsync()
+        {
+            Task<int> result = new Task<int>(() =>
+            {
+                IDeleteable<T> asyncDeleteable = CopyDeleteable();
+                return asyncDeleteable.ExecuteCommand();
+            });
+            return result;
+        }
         public IDeleteable<T> AS(string tableName)
         {
             var entityName = typeof(T).Name;
@@ -206,7 +215,6 @@ namespace SqlSugar
             return new KeyValuePair<string, List<SugarParameter>>(sql, paramters);
         }
 
-
         private List<string> GetPrimaryKeys()
         {
             if (this.Context.IsSystemTablesConfig)
@@ -218,6 +226,7 @@ namespace SqlSugar
                 return this.EntityInfo.Columns.Where(it => it.IsPrimarykey).Select(it => it.DbColumnName).ToList();
             }
         }
+
         private List<string> GetIdentityKeys()
         {
             if (this.Context.IsSystemTablesConfig)
@@ -229,6 +238,7 @@ namespace SqlSugar
                 return this.EntityInfo.Columns.Where(it => it.IsIdentity).Select(it => it.DbColumnName).ToList();
             }
         }
+
         private void RestoreMapping()
         {
             if (IsAs)
@@ -236,5 +246,24 @@ namespace SqlSugar
                 this.Context.MappingTables = OldMappingTableList;
             }
         }
+
+        private IDeleteable<T> CopyDeleteable() {
+            var asyncContext = this.Context.CopyContext(this.Context.RewritableMethods.TranslateCopy(this.Context.CurrentConnectionConfig));
+            asyncContext.CurrentConnectionConfig.IsAutoCloseConnection = true;
+            asyncContext.Ado.IsEnableLogEvent = this.Context.Ado.IsEnableLogEvent;
+            asyncContext.Ado.LogEventStarting = this.Context.Ado.LogEventStarting;
+            asyncContext.Ado.LogEventCompleted = this.Context.Ado.LogEventCompleted;
+            asyncContext.Ado.ProcessingEventStartingSQL = this.Context.Ado.ProcessingEventStartingSQL;
+
+            var asyncDeleteable = asyncContext.Deleteable<T>();
+            var asyncDeleteBuilder = asyncDeleteable.DeleteBuilder;
+            asyncDeleteBuilder.BigDataFiled = this.DeleteBuilder.BigDataFiled;
+            asyncDeleteBuilder.BigDataInValues = this.DeleteBuilder.BigDataInValues;
+            asyncDeleteBuilder.Parameters = this.DeleteBuilder.Parameters;
+            asyncDeleteBuilder.sql = this.DeleteBuilder.sql;
+            asyncDeleteBuilder.WhereInfos = this.DeleteBuilder.WhereInfos;
+            asyncDeleteBuilder.TableWithString = this.DeleteBuilder.TableWithString;
+            return asyncDeleteable;
+        }
     }
 }
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/InsertableProvider/InsertableProvider.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/InsertableProvider/InsertableProvider.cs
index c86a9ee1e..5aa0b0554 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/InsertableProvider/InsertableProvider.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/InsertableProvider/InsertableProvider.cs
@@ -82,6 +82,51 @@ namespace SqlSugar
             this.Context.EntityProvider.GetProperty<T>(identityKey).SetValue(result,setValue, null);
             return idValue>0;
         }
+        public Task<int> ExecuteCommandAsync()
+        {
+            Task<int> result = new Task<int>(() =>
+            {
+                IInsertable<T> asyncInsertable = CopyInsertable();
+                return asyncInsertable.ExecuteCommand();
+            });
+            return result;
+        }
+        public Task<int> ExecuteReturnIdentityAsync()
+        {
+            Task<int> result = new Task<int>(() =>
+            {
+                IInsertable<T> asyncInsertable = CopyInsertable();
+                return asyncInsertable.ExecuteReturnIdentity();
+            });
+            return result;
+        }
+        public Task<T> ExecuteReturnEntityAsync()
+        {
+            Task<T> result = new Task<T>(() =>
+            {
+                IInsertable<T> asyncInsertable = CopyInsertable();
+                return asyncInsertable.ExecuteReturnEntity();
+            });
+            return result;
+        }
+        public Task<bool> ExecuteCommandIdentityIntoEntityAsync()
+        {
+            Task<bool> result = new Task<bool>(() =>
+            {
+                IInsertable<T> asyncInsertable = CopyInsertable();
+                return asyncInsertable.ExecuteCommandIdentityIntoEntity();
+            });
+            return result;
+        }
+        public Task<long> ExecuteReturnBigIdentityAsync()
+        {
+            Task<long> result = new Task<long>(() =>
+            {
+                IInsertable<T> asyncInsertable = CopyInsertable();
+                return asyncInsertable.ExecuteReturnBigIdentity();
+            });
+            return result;
+        }
         #endregion
 
         #region Setting
@@ -255,6 +300,27 @@ namespace SqlSugar
                 this.Context.MappingTables = OldMappingTableList;
             }
         }
+        private IInsertable<T> CopyInsertable()
+        {
+            var asyncContext = this.Context.CopyContext(this.Context.RewritableMethods.TranslateCopy(this.Context.CurrentConnectionConfig));
+            asyncContext.CurrentConnectionConfig.IsAutoCloseConnection = true;
+            asyncContext.Ado.IsEnableLogEvent = this.Context.Ado.IsEnableLogEvent;
+            asyncContext.Ado.LogEventStarting = this.Context.Ado.LogEventStarting;
+            asyncContext.Ado.LogEventCompleted = this.Context.Ado.LogEventCompleted;
+            asyncContext.Ado.ProcessingEventStartingSQL = this.Context.Ado.ProcessingEventStartingSQL;
+
+            var asyncInsertable = asyncContext.Insertable<T>(this.InsertObjs);
+            var asyncInsertableBuilder = asyncInsertable.InsertBuilder;
+            asyncInsertableBuilder.DbColumnInfoList = this.InsertBuilder.DbColumnInfoList;
+            asyncInsertableBuilder.EntityInfo = this.InsertBuilder.EntityInfo;
+            asyncInsertableBuilder.Parameters = this.InsertBuilder.Parameters;
+            asyncInsertableBuilder.sql = this.InsertBuilder.sql;
+            asyncInsertableBuilder.IsNoInsertNull = this.InsertBuilder.IsNoInsertNull;
+            asyncInsertableBuilder.IsReturnIdentity = this.InsertBuilder.IsReturnIdentity;
+            asyncInsertableBuilder.EntityInfo = this.InsertBuilder.EntityInfo;
+            asyncInsertableBuilder.TableWithString = this.InsertBuilder.TableWithString;
+            return asyncInsertable;
+        }
         #endregion
     }
 }
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
index dd6ed862d..a53215f8d 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/QueryableProvider/QueryableProvider.cs
@@ -9,6 +9,7 @@ using System.Text;
 using System.Text.RegularExpressions;
 using System.Reflection;
 using System.Dynamic;
+using System.Threading.Tasks;
 
 namespace SqlSugar
 {
@@ -28,6 +29,9 @@ namespace SqlSugar
             {
                 return this.SqlBuilder.QueryBuilder;
             }
+            set {
+                this.SqlBuilder.QueryBuilder = value;
+            }
         }
         public EntityInfo EntityInfo
         {
@@ -332,16 +336,28 @@ namespace SqlSugar
             {
                 QueryBuilder.OrderByValue = QueryBuilder.DefaultOrderByTemplate;
             }
-            QueryBuilder.Skip = 0;
-            QueryBuilder.Take = 1;
+            var oldSkip = QueryBuilder.Skip;
+            var oldTake = QueryBuilder.Take;
+            var oldOrderBy = QueryBuilder.OrderByValue;
+            QueryBuilder.Skip = null;
+            QueryBuilder.Take = null;
+            QueryBuilder.OrderByValue = null;
             var reval = this.ToList();
-            if (reval.IsValuable())
+            QueryBuilder.Skip = oldSkip;
+            QueryBuilder.Take = oldTake;
+            QueryBuilder.OrderByValue = oldOrderBy;
+            if (reval == null || reval.Count == 0)
             {
-                return reval.SingleOrDefault();
+                return default(T);
+            }
+            else if (reval.Count == 2)
+            {
+                Check.Exception(true, ".Single()  result must not exceed one . You can use.First()");
+                return default(T);
             }
             else
             {
-                return default(T);
+                return reval.SingleOrDefault();
             }
         }
         public virtual T Single(Expression<Func<T, bool>> expression)
@@ -377,7 +393,7 @@ namespace SqlSugar
         public virtual bool Any(Expression<Func<T, bool>> expression)
         {
             _Where(expression);
-            var result= Any();
+            var result = Any();
             this.QueryBuilder.WhereInfos.Remove(this.QueryBuilder.WhereInfos.Last());
             return result;
         }
@@ -408,7 +424,7 @@ namespace SqlSugar
             Check.Exception(this.QueryBuilder.SelectValue.IsNullOrEmpty(), "MergeTable need to use Select(it=>new{}) Method .");
             Check.Exception(this.QueryBuilder.Skip > 0 || this.QueryBuilder.Take > 0, "MergeTable  Queryable cannot Take Skip OrderBy PageToList  ");
             var sql = QueryBuilder.ToSqlString();
-            var tableName =this.SqlBuilder.GetPackTable (sql, "MergeTable");
+            var tableName = this.SqlBuilder.GetPackTable(sql, "MergeTable");
             return this.Context.Queryable<ExpandoObject>().AS(tableName).Select<T>("*");
         }
 
@@ -556,6 +572,253 @@ namespace SqlSugar
             return new KeyValuePair<string, List<SugarParameter>>(sql, QueryBuilder.Parameters);
         }
 
+        #region Async methods
+        public Task<T> SingleAsync()
+        {
+            Task<T> result = new Task<T>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Single();
+            });
+            return result;
+        }
+
+        public Task<T> SingleAsync(Expression<Func<T, bool>> expression)
+        {
+            Task<T> result = new Task<T>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Single(expression);
+            });
+            return result;
+        }
+
+        public Task<T> FirstAsync()
+        {
+            Task<T> result = new Task<T>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.First();
+            });
+            return result;
+        }
+
+        public Task<T> FirstAsync(Expression<Func<T, bool>> expression)
+        {
+            Task<T> result = new Task<T>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.First(expression);
+            });
+            return result;
+        }
+
+        public Task<bool> AnyAsync(Expression<Func<T, bool>> expression)
+        {
+            Task<bool> result = new Task<bool>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Any(expression);
+            });
+            return result;
+        }
+
+        public Task<bool> AnyAsync()
+        {
+            Task<bool> result = new Task<bool>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Any();
+            });
+            return result;
+        }
+
+        public Task<int> CountAsync()
+        {
+            Task<int> result = new Task<int>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Count();
+            });
+            return result;
+        }
+
+        public Task<TResult> MaxAsync<TResult>(string maxField)
+        {
+            Task<TResult> result = new Task<TResult>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Max<TResult>(maxField);
+            });
+            return result;
+        }
+
+        public Task<TResult> MaxAsync<TResult>(Expression<Func<T, TResult>> expression)
+        {
+            Task<TResult> result = new Task<TResult>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Max<TResult>(expression);
+            });
+            return result;
+        }
+
+        public Task<TResult> MinAsync<TResult>(string minField)
+        {
+            Task<TResult> result = new Task<TResult>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Min<TResult>(minField);
+            });
+            return result;
+        }
+
+        public Task<TResult> MinAsync<TResult>(Expression<Func<T, TResult>> expression)
+        {
+            Task<TResult> result = new Task<TResult>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Min<TResult>(expression);
+            });
+            return result;
+        }
+
+        public Task<TResult> SumAsync<TResult>(string sumField)
+        {
+            Task<TResult> result = new Task<TResult>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Sum<TResult>(sumField);
+            });
+            return result;
+        }
+
+        public Task<TResult> SumAsync<TResult>(Expression<Func<T, TResult>> expression)
+        {
+            Task<TResult> result = new Task<TResult>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Sum<TResult>(expression);
+            });
+            return result;
+        }
+
+        public Task<TResult> AvgAsync<TResult>(string avgField)
+        {
+            Task<TResult> result = new Task<TResult>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Avg<TResult>(avgField);
+            });
+            return result;
+        }
+
+        public Task<TResult> AvgAsync<TResult>(Expression<Func<T, TResult>> expression)
+        {
+            Task<TResult> result = new Task<TResult>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.Avg<TResult>(expression);
+            });
+            return result;
+        }
+
+        public Task<List<T>> ToListAsync()
+        {
+            Task<List<T>> result = new Task<List<T>>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.ToList();
+            });
+            return result;
+        }
+
+        public Task<string> ToJsonAsync()
+        {
+            Task<string> result = new Task<string>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.ToJson();
+            });
+            return result;
+        }
+
+        public Task<string> ToJsonPageAsync(int pageIndex, int pageSize)
+        {
+            Task<string> result = new Task<string>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.ToJsonPage(pageIndex,pageSize);
+            });
+            return result;
+        }
+
+        public Task<KeyValuePair<string,int>> ToJsonPageAsync(int pageIndex, int pageSize, int totalNumber)
+        {
+            Task<KeyValuePair<string, int>> result = new Task<KeyValuePair<string, int>>(() =>
+            {
+                int totalNumberAsync = 0;
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                var list= asyncQueryable.ToJsonPage(pageIndex, pageSize,ref totalNumberAsync);
+                return new KeyValuePair<string, int>(list, totalNumberAsync);
+            });
+            return result;
+        }
+
+        public Task<DataTable> ToDataTableAsync()
+        {
+            Task<DataTable> result = new Task<DataTable>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.ToDataTable();
+            });
+            return result;
+        }
+
+        public Task<DataTable> ToDataTablePageAsync(int pageIndex, int pageSize)
+        {
+            Task<DataTable> result = new Task<DataTable>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.ToDataTablePage(pageIndex, pageSize);
+            });
+            return result;
+        }
+
+        public Task<KeyValuePair<DataTable, int>> ToDataTablePageAsync(int pageIndex, int pageSize,int totalNumber)
+        {
+            Task<KeyValuePair<DataTable, int>> result = new Task<KeyValuePair<DataTable, int>>(() =>
+            {
+                int totalNumberAsync = 0;
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                var list = asyncQueryable.ToDataTablePage(pageIndex, pageSize, ref totalNumberAsync);
+                return new KeyValuePair<DataTable, int>(list, totalNumberAsync);
+            });
+            return result;
+        }
+
+        public Task<List<T>> ToPageListAsync(int pageIndex, int pageSize)
+        {
+            Task<List<T>> result = new Task<List<T>>(() =>
+            {
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                return asyncQueryable.ToPageList(pageIndex, pageSize);
+            });
+            return result;
+        }
+
+        public Task<KeyValuePair<List<T>, int>> ToPageListAsync(int pageIndex, int pageSize, int totalNumber)
+        {
+            Task<KeyValuePair<List<T>, int>> result = new Task<KeyValuePair<List<T>, int>>(() =>
+            {
+                int totalNumberAsync = 0;
+                ISugarQueryable<T> asyncQueryable = CopyQueryable();
+                var list = asyncQueryable.ToPageList(pageIndex, pageSize, ref totalNumberAsync);
+                return new KeyValuePair<List<T>, int>(list, totalNumberAsync);
+            });
+            return result;
+        }
+        #endregion
 
         #region Private Methods
         protected ISugarQueryable<TResult> _Select<TResult>(Expression expression)
@@ -661,7 +924,7 @@ namespace SqlSugar
             {
                 if (typeof(TResult) == typeof(ExpandoObject))
                 {
-                     return this.Context.RewritableMethods.DataReaderToExpandoObjectList(dataReader) as List<TResult>;
+                    return this.Context.RewritableMethods.DataReaderToExpandoObjectList(dataReader) as List<TResult>;
                 }
                 if (entityType.IsAnonymousType() || isComplexModel)
                 {
@@ -681,7 +944,7 @@ namespace SqlSugar
             string sql = sqlObj.Key;
             if (sqlObj.Value.IsValuable())
             {
-                this.SqlBuilder.RepairReplicationParameters(ref sql,sqlObj.Value.ToArray(),100);
+                this.SqlBuilder.RepairReplicationParameters(ref sql, sqlObj.Value.ToArray(), 100);
                 this.QueryBuilder.Parameters.AddRange(sqlObj.Value);
             }
             var isSingle = QueryBuilder.IsSingle();
@@ -739,15 +1002,37 @@ namespace SqlSugar
                         var contextProperty = item.GetType().GetProperty("Context");
                         ConnectionConfig config = new ConnectionConfig();
                         config = this.Context.CurrentConnectionConfig;
-                        var newClient = new SqlSugarClient(config);
-                        newClient.MappingColumns = this.Context.MappingColumns;
-                        newClient.MappingTables = this.Context.MappingTables;
-                        newClient.IgnoreColumns = this.Context.IgnoreColumns;
+                        SqlSugarClient newClient = this.Context.CopyContext(config);
                         contextProperty.SetValue(item, newClient, null);
                     }
                 }
             }
         }
+        private ISugarQueryable<T> CopyQueryable()
+        {
+            var asyncContext = this.Context.CopyContext(this.Context.RewritableMethods.TranslateCopy(this.Context.CurrentConnectionConfig));
+            asyncContext.CurrentConnectionConfig.IsAutoCloseConnection = true;
+            asyncContext.Ado.IsEnableLogEvent = this.Context.Ado.IsEnableLogEvent;
+            asyncContext.Ado.LogEventStarting = this.Context.Ado.LogEventStarting;
+            asyncContext.Ado.LogEventCompleted = this.Context.Ado.LogEventCompleted;
+            asyncContext.Ado.ProcessingEventStartingSQL = this.Context.Ado.ProcessingEventStartingSQL;
+
+            var asyncQueryable = asyncContext.Queryable<ExpandoObject>().Select<T>(string.Empty);
+            var asyncQueryableBuilder = asyncQueryable.QueryBuilder;
+            asyncQueryableBuilder.Take = this.QueryBuilder.Take;
+            asyncQueryableBuilder.Skip = this.QueryBuilder.Skip;
+            asyncQueryableBuilder.SelectValue = this.QueryBuilder.SelectValue;
+            asyncQueryableBuilder.WhereInfos = this.QueryBuilder.WhereInfos;
+            asyncQueryableBuilder.EasyJoinInfos = this.QueryBuilder.EasyJoinInfos;
+            asyncQueryableBuilder.JoinQueryInfos = this.QueryBuilder.JoinQueryInfos;
+            asyncQueryableBuilder.WhereIndex = this.QueryBuilder.WhereIndex;
+            asyncQueryableBuilder.EntityType = this.QueryBuilder.EntityType;
+            asyncQueryableBuilder.EntityName = this.QueryBuilder.EntityName;
+            asyncQueryableBuilder.Parameters = this.QueryBuilder.Parameters;
+            asyncQueryableBuilder.TableShortName = this.QueryBuilder.TableShortName;
+            asyncQueryableBuilder.TableWithString = this.QueryBuilder.TableWithString;
+            return asyncQueryable;
+        }
         #endregion
     }
     #endregion
@@ -2152,7 +2437,7 @@ namespace SqlSugar
     }
     #endregion
     #region T9
-    public partial class QueryableProvider<T, T2, T3, T4, T5, T6, T7, T8,T9> : QueryableProvider<T>, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8,T9>
+    public partial class QueryableProvider<T, T2, T3, T4, T5, T6, T7, T8, T9> : QueryableProvider<T>, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9>
     {
         #region Where
         public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9> Where(Expression<Func<T, bool>> expression)
@@ -2195,7 +2480,7 @@ namespace SqlSugar
             _Where(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9> Where(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8,T9, bool>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9> Where(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, bool>> expression)
         {
             _Where(expression);
             return this;
@@ -2255,7 +2540,7 @@ namespace SqlSugar
                 _Where(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9> WhereIF(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, T8,T9, bool>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9> WhereIF(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, bool>> expression)
         {
             if (isWhere)
                 _Where(expression);
@@ -2305,14 +2590,14 @@ namespace SqlSugar
         {
             return _Select<TResult>(expression);
         }
-        public ISugarQueryable<TResult> Select<TResult>(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8,T9, TResult>> expression)
+        public ISugarQueryable<TResult> Select<TResult>(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, TResult>> expression)
         {
             return _Select<TResult>(expression);
         }
         #endregion
 
         #region OrderBy
-        public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7,T8,T9> OrderBy(Expression<Func<T, object>> expression, OrderByType type = OrderByType.Asc)
+        public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9> OrderBy(Expression<Func<T, object>> expression, OrderByType type = OrderByType.Asc)
         {
             _OrderBy(expression, type);
             return this;
@@ -2352,7 +2637,7 @@ namespace SqlSugar
             _OrderBy(expression, type);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9> OrderBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8,T9, object>> expression, OrderByType type = OrderByType.Asc)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9> OrderBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, object>> expression, OrderByType type = OrderByType.Asc)
         {
             _OrderBy(expression, type);
             return this;
@@ -2400,7 +2685,7 @@ namespace SqlSugar
             _GroupBy(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9> GroupBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8,T9, object>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9> GroupBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, object>> expression)
         {
             _GroupBy(expression);
             return this;
@@ -2453,7 +2738,7 @@ namespace SqlSugar
     }
     #endregion
     #region T10
-    public partial class QueryableProvider<T, T2, T3, T4, T5, T6, T7, T8, T9,T10> : QueryableProvider<T>, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9,T10>
+    public partial class QueryableProvider<T, T2, T3, T4, T5, T6, T7, T8, T9, T10> : QueryableProvider<T>, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10>
     {
         #region Where
         public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10> Where(Expression<Func<T, bool>> expression)
@@ -2501,7 +2786,7 @@ namespace SqlSugar
             _Where(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10> Where(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9,T10, bool>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10> Where(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, bool>> expression)
         {
             _Where(expression);
             return this;
@@ -2567,7 +2852,7 @@ namespace SqlSugar
                 _Where(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10> WhereIF(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9,T10, bool>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10> WhereIF(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, bool>> expression)
         {
             if (isWhere)
                 _Where(expression);
@@ -2620,7 +2905,7 @@ namespace SqlSugar
         {
             return _Select<TResult>(expression);
         }
-        public ISugarQueryable<TResult> Select<TResult>(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9,T10, TResult>> expression)
+        public ISugarQueryable<TResult> Select<TResult>(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, TResult>> expression)
         {
             return _Select<TResult>(expression);
         }
@@ -2672,7 +2957,7 @@ namespace SqlSugar
             _OrderBy(expression, type);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10> OrderBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9,T10, object>> expression, OrderByType type = OrderByType.Asc)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10> OrderBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, object>> expression, OrderByType type = OrderByType.Asc)
         {
             _OrderBy(expression, type);
             return this;
@@ -2680,7 +2965,7 @@ namespace SqlSugar
         #endregion
 
         #region GroupBy
-        public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9,T10> GroupBy(Expression<Func<T, object>> expression)
+        public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10> GroupBy(Expression<Func<T, object>> expression)
         {
             _GroupBy(expression);
             return this;
@@ -2725,7 +3010,7 @@ namespace SqlSugar
             _GroupBy(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10> GroupBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9,T10, object>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10> GroupBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, object>> expression)
         {
             _GroupBy(expression);
             return this;
@@ -2778,7 +3063,7 @@ namespace SqlSugar
     }
     #endregion
     #region T11
-    public partial class QueryableProvider<T, T2, T3, T4, T5, T6, T7, T8, T9, T10,T11> : QueryableProvider<T>, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11>
+    public partial class QueryableProvider<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> : QueryableProvider<T>, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11>
     {
         #region Where
         public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> Where(Expression<Func<T, bool>> expression)
@@ -2831,7 +3116,7 @@ namespace SqlSugar
             _Where(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> Where(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10,T11, bool>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> Where(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, bool>> expression)
         {
             _Where(expression);
             return this;
@@ -2903,7 +3188,7 @@ namespace SqlSugar
                 _Where(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> WhereIF(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10,T11, bool>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> WhereIF(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, bool>> expression)
         {
             if (isWhere)
                 _Where(expression);
@@ -2960,7 +3245,7 @@ namespace SqlSugar
         {
             return _Select<TResult>(expression);
         }
-        public ISugarQueryable<TResult> Select<TResult>(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10,T11, TResult>> expression)
+        public ISugarQueryable<TResult> Select<TResult>(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, TResult>> expression)
         {
             return _Select<TResult>(expression);
         }
@@ -3017,7 +3302,7 @@ namespace SqlSugar
             _OrderBy(expression, type);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> OrderBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10,T11, object>> expression, OrderByType type = OrderByType.Asc)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> OrderBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, object>> expression, OrderByType type = OrderByType.Asc)
         {
             _OrderBy(expression, type);
             return this;
@@ -3075,7 +3360,7 @@ namespace SqlSugar
             _GroupBy(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> GroupBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10,T11, object>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> GroupBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, object>> expression)
         {
             _GroupBy(expression);
             return this;
@@ -3128,7 +3413,7 @@ namespace SqlSugar
     }
     #endregion
     #region T12
-    public partial class QueryableProvider<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11,T12> : QueryableProvider<T>, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11,T12>
+    public partial class QueryableProvider<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> : QueryableProvider<T>, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12>
     {
         #region Where
         public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> Where(Expression<Func<T, bool>> expression)
@@ -3186,7 +3471,7 @@ namespace SqlSugar
             _Where(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> Where(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11,T12, bool>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> Where(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, bool>> expression)
         {
             _Where(expression);
             return this;
@@ -3264,7 +3549,7 @@ namespace SqlSugar
                 _Where(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> WhereIF(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11,T12, bool>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> WhereIF(bool isWhere, Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, bool>> expression)
         {
             if (isWhere)
                 _Where(expression);
@@ -3325,7 +3610,7 @@ namespace SqlSugar
         {
             return _Select<TResult>(expression);
         }
-        public ISugarQueryable<TResult> Select<TResult>(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11,T12, TResult>> expression)
+        public ISugarQueryable<TResult> Select<TResult>(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, TResult>> expression)
         {
             return _Select<TResult>(expression);
         }
@@ -3387,7 +3672,7 @@ namespace SqlSugar
             _OrderBy(expression, type);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> OrderBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11,T12, object>> expression, OrderByType type = OrderByType.Asc)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> OrderBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, object>> expression, OrderByType type = OrderByType.Asc)
         {
             _OrderBy(expression, type);
             return this;
@@ -3450,7 +3735,7 @@ namespace SqlSugar
             _GroupBy(expression);
             return this;
         }
-        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> GroupBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11,T12, object>> expression)
+        public ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> GroupBy(Expression<Func<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, object>> expression)
         {
             _GroupBy(expression);
             return this;
@@ -3477,21 +3762,24 @@ namespace SqlSugar
         #endregion
 
         #region In
-        public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> In<FieldType>(Expression<Func<T, object>> expression, params FieldType[] inValues) {
+        public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> In<FieldType>(Expression<Func<T, object>> expression, params FieldType[] inValues)
+        {
             var isSingle = QueryBuilder.IsSingle();
             var lamResult = QueryBuilder.GetExpressionValue(expression, isSingle ? ResolveExpressType.FieldSingle : ResolveExpressType.FieldMultiple);
             var fieldName = lamResult.GetResultString();
             In(fieldName, inValues);
             return this;
         }
-        public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> In<FieldType>(Expression<Func<T, object>> expression, List<FieldType> inValues) {
+        public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> In<FieldType>(Expression<Func<T, object>> expression, List<FieldType> inValues)
+        {
             var isSingle = QueryBuilder.IsSingle();
             var lamResult = QueryBuilder.GetExpressionValue(expression, isSingle ? ResolveExpressType.FieldSingle : ResolveExpressType.FieldMultiple);
             var fieldName = lamResult.GetResultString();
             In(fieldName, inValues);
             return this;
         }
-        public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> In<FieldType>(Expression<Func<T, object>> expression, ISugarQueryable<FieldType> childQueryExpression) {
+        public new ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> In<FieldType>(Expression<Func<T, object>> expression, ISugarQueryable<FieldType> childQueryExpression)
+        {
             var sqlObj = childQueryExpression.ToSql();
             _InQueryable(expression, sqlObj);
             return this;
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/UpdateProvider/UpdateableProvider.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/UpdateProvider/UpdateableProvider.cs
index 1f953b691..9989e156f 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/UpdateProvider/UpdateableProvider.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Abstract/UpdateProvider/UpdateableProvider.cs
@@ -8,12 +8,12 @@ using System.Threading.Tasks;
 
 namespace SqlSugar
 {
-    public class UpdateableProvider<T> : IUpdateable<T>
+    public class UpdateableProvider<T> : IUpdateable<T> where T : class, new()
     {
         public SqlSugarClient Context { get; internal set; }
         public EntityInfo EntityInfo { get; internal set; }
         public ISqlBuilder SqlBuilder { get; internal set; }
-        public UpdateBuilder UpdateBuilder { get; internal set; }
+        public UpdateBuilder UpdateBuilder { get; set; }
         public IAdo Ado { get { return Context.Ado; } }
         public T[] UpdateObjs { get; set; }
         public bool IsMappingTable { get { return this.Context.MappingTables != null && this.Context.MappingTables.Any(); } }
@@ -33,6 +33,15 @@ namespace SqlSugar
             Check.Exception(UpdateBuilder.WhereValues.IsNullOrEmpty() && GetPrimaryKeys().IsNullOrEmpty(), "You cannot have no primary key and no conditions");
             return this.Ado.ExecuteCommand(sql, UpdateBuilder.Parameters == null ? null : UpdateBuilder.Parameters.ToArray());
         }
+        public Task<int> ExecuteCommandAsync()
+        {
+            Task<int> result = new Task<int>(() =>
+            {
+                IUpdateable<T> asyncUpdateable = CopyUpdateable();
+                return asyncUpdateable.ExecuteCommand();
+            });
+            return result;
+        }
         public IUpdateable<T> AS(string tableName)
         {
             var entityName = typeof(T).Name;
@@ -84,7 +93,7 @@ namespace SqlSugar
             if (this.WhereColumnList == null) this.WhereColumnList = new List<string>();
             foreach (var item in whereColumns)
             {
-              this.WhereColumnList.Add(this.Context.EntityProvider.GetDbColumnName<T>(item));
+                this.WhereColumnList.Add(this.Context.EntityProvider.GetDbColumnName<T>(item));
             }
             return this;
         }
@@ -268,7 +277,8 @@ namespace SqlSugar
         }
         private List<string> GetPrimaryKeys()
         {
-            if (this.WhereColumnList.IsValuable()) {
+            if (this.WhereColumnList.IsValuable())
+            {
                 return this.WhereColumnList;
             }
             if (this.Context.IsSystemTablesConfig)
@@ -298,5 +308,28 @@ namespace SqlSugar
                 this.Context.MappingTables = OldMappingTableList;
             }
         }
+        private IUpdateable<T> CopyUpdateable()
+        {
+            var asyncContext = this.Context.CopyContext(this.Context.RewritableMethods.TranslateCopy(this.Context.CurrentConnectionConfig));
+            asyncContext.CurrentConnectionConfig.IsAutoCloseConnection = true;
+            asyncContext.Ado.IsEnableLogEvent = this.Context.Ado.IsEnableLogEvent;
+            asyncContext.Ado.LogEventStarting = this.Context.Ado.LogEventStarting;
+            asyncContext.Ado.LogEventCompleted = this.Context.Ado.LogEventCompleted;
+            asyncContext.Ado.ProcessingEventStartingSQL = this.Context.Ado.ProcessingEventStartingSQL;
+
+            var asyncUpdateable = asyncContext.Updateable<T>(this.UpdateObjs);
+            var asyncUpdateableBuilder = asyncUpdateable.UpdateBuilder;
+            asyncUpdateableBuilder.DbColumnInfoList = this.UpdateBuilder.DbColumnInfoList;
+            asyncUpdateableBuilder.IsNoUpdateNull = this.UpdateBuilder.IsNoUpdateNull;
+            asyncUpdateableBuilder.Parameters = this.UpdateBuilder.Parameters;
+            asyncUpdateableBuilder.sql = this.UpdateBuilder.sql;
+            asyncUpdateableBuilder.WhereValues = this.UpdateBuilder.WhereValues;
+            asyncUpdateableBuilder.TableWithString = this.UpdateBuilder.TableWithString;
+            asyncUpdateableBuilder.TableName = this.UpdateBuilder.TableName;
+            asyncUpdateableBuilder.PrimaryKeys = this.UpdateBuilder.PrimaryKeys;
+            asyncUpdateableBuilder.IsOffIdentity = this.UpdateBuilder.IsOffIdentity;
+            asyncUpdateableBuilder.SetValues = this.UpdateBuilder.SetValues;
+            return asyncUpdateable;
+        }
     }
 }
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Entities/ConnectionConfig.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Entities/ConnectionConfig.cs
index 59057cdbb..006a693c3 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Entities/ConnectionConfig.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Entities/ConnectionConfig.cs
@@ -10,7 +10,7 @@ namespace SqlSugar
         /// <summary>
         ///DbType.SqlServer Or Other
         /// </summary>
-        public string DbType { get; set; }
+        public DbType DbType { get; set; }
         /// <summary>
         ///Database Connection string
         /// </summary>
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Entities/DbType.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Entities/DbType.cs
deleted file mode 100644
index 202b23010..000000000
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Entities/DbType.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-
-namespace SqlSugar
-{
-    public partial class DbType
-    {
-        public const string MySql = "MySql";
-        public const string SqlServer = "SqlServer";
-        public const string Sqlite = "Sqlite";
-        public const string Oracle = "Oracle";
-    }
-}
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Entities/ModelContext.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Entities/ModelContext.cs
index 32ec11834..aec879c4f 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Entities/ModelContext.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Entities/ModelContext.cs
@@ -1,4 +1,5 @@
-using System;
+using Newtonsoft.Json;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
@@ -8,6 +9,7 @@ namespace SqlSugar
     public class ModelContext
     {
         [SugarColumn(IsIgnore = true)]
+        [JsonIgnore]
         public SqlSugarClient Context { get; set; }
         public ISugarQueryable<T> CreateMapping<T>() where T : class, new()
         {
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Enum/DbType.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Enum/DbType.cs
new file mode 100644
index 000000000..51be78f4e
--- /dev/null
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Enum/DbType.cs
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace SqlSugar
+{
+    public enum DbType
+    {
+        MySql ,
+        SqlServer,
+        Sqlite,
+        Oracle
+    }
+}
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/Common/SugarParameter.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/Common/SugarParameter.cs
index 816ba1072..1a75b0966 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/Common/SugarParameter.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/ExpressionsToSql/Common/SugarParameter.cs
@@ -71,6 +71,11 @@ namespace SqlSugar
             {
                 this.DbType = System.Data.DbType.Boolean;
             }
+            else if (type == UtilConstants.StringType)
+            {
+                this.DbType = System.Data.DbType.String;
+            }
+
         }
         public SugarParameter(string name, object value, bool isOutput)
         {
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Infrastructure/InstanceFactory.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Infrastructure/InstanceFactory.cs
index 525f912a9..db3d42196 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Infrastructure/InstanceFactory.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Infrastructure/InstanceFactory.cs
@@ -21,7 +21,7 @@ namespace SqlSugar
             else
             {
                 string className = "Queryable";
-                className = GetClassName(currentConnectionConfig.DbType, className);
+                className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
                 ISugarQueryable<T> result = CreateInstance<T, ISugarQueryable<T>>(className);
                 return result;
             }
@@ -35,7 +35,7 @@ namespace SqlSugar
             else
             {
                 string className = "Queryable";
-                className = GetClassName(currentConnectionConfig.DbType, className);
+                className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
                 ISugarQueryable<T, T2> result = CreateInstance<T, T2, ISugarQueryable<T, T2>>(className);
                 return result;
             }
@@ -49,7 +49,7 @@ namespace SqlSugar
             else
             {
                 string className = "Queryable";
-                className = GetClassName(currentConnectionConfig.DbType, className);
+                className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
                 ISugarQueryable<T, T2, T3> result = CreateInstance<T, T2, T3, ISugarQueryable<T, T2, T3>>(className);
                 return result;
             }
@@ -57,35 +57,35 @@ namespace SqlSugar
         public static ISugarQueryable<T, T2, T3, T4> GetQueryable<T, T2, T3, T4>(ConnectionConfig currentConnectionConfig)
         {
             string className = "Queryable";
-            className = GetClassName(currentConnectionConfig.DbType, className);
+            className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
             ISugarQueryable<T, T2, T3, T4> result = CreateInstance<T, T2, T3, T4, ISugarQueryable<T, T2, T3, T4>>(className);
             return result;
         }
         public static ISugarQueryable<T, T2, T3, T4, T5> GetQueryable<T, T2, T3, T4, T5>(ConnectionConfig currentConnectionConfig)
         {
             string className = "Queryable";
-            className = GetClassName(currentConnectionConfig.DbType, className);
+            className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
             ISugarQueryable<T, T2, T3, T4, T5> result = CreateInstance<T, T2, T3, T4, T5, ISugarQueryable<T, T2, T3, T4, T5>>(className);
             return result;
         }
         public static ISugarQueryable<T, T2, T3, T4, T5, T6> GetQueryable<T, T2, T3, T4, T5, T6>(ConnectionConfig currentConnectionConfig)
         {
             string className = "Queryable";
-            className = GetClassName(currentConnectionConfig.DbType, className);
+            className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
             ISugarQueryable<T, T2, T3, T4, T5, T6> result = CreateInstance<T, T2, T3, T4, T5, T6, ISugarQueryable<T, T2, T3, T4, T5, T6>>(className);
             return result;
         }
         public static ISugarQueryable<T, T2, T3, T4, T5, T6, T7> GetQueryable<T, T2, T3, T4, T5, T6, T7>(ConnectionConfig currentConnectionConfig)
         {
             string className = "Queryable";
-            className = GetClassName(currentConnectionConfig.DbType, className);
+            className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
             ISugarQueryable<T, T2, T3, T4, T5, T6, T7> result = CreateInstance<T, T2, T3, T4, T5, T6, T7, ISugarQueryable<T, T2, T3, T4, T5, T6, T7>>(className);
             return result;
         }
         public static ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> GetQueryable<T, T2, T3, T4, T5, T6, T7, T8>(ConnectionConfig currentConnectionConfig)
         {
             string className = "Queryable";
-            className = GetClassName(currentConnectionConfig.DbType, className);
+            className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
             ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8> result = CreateInstance<T, T2, T3, T4, T5, T6, T7, T8, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8>>(className);
             return result;
         }
@@ -94,28 +94,28 @@ namespace SqlSugar
         public static ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8,T9> GetQueryable<T, T2, T3, T4, T5, T6, T7, T8,T9>(ConnectionConfig currentConnectionConfig)
         {
             string className = "Queryable";
-            className = GetClassName(currentConnectionConfig.DbType, className);
+            className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
             ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8,T9> result = CreateInstance<T, T2, T3, T4, T5, T6, T7, T8,T9, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8,T9>>(className);
             return result;
         }
         public static ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9,T10> GetQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9,T10>(ConnectionConfig currentConnectionConfig)
         {
             string className = "Queryable";
-            className = GetClassName(currentConnectionConfig.DbType, className);
+            className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
             ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9,T10> result = CreateInstance<T, T2, T3, T4, T5, T6, T7, T8, T9,T10, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9,T10>>(className);
             return result;
         }
         public static ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10,T11> GetQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10,T11>(ConnectionConfig currentConnectionConfig)
         {
             string className = "Queryable";
-            className = GetClassName(currentConnectionConfig.DbType, className);
+            className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
             ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10,T11> result = CreateInstance<T, T2, T3, T4, T5, T6, T7, T8, T9, T10,T11, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10,T11>>(className);
             return result;
         }
         public static ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11,T12> GetQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12>(ConnectionConfig currentConnectionConfig)
         {
             string className = "Queryable";
-            className = GetClassName(currentConnectionConfig.DbType, className);
+            className = GetClassName(currentConnectionConfig.DbType.ToString(), className);
             ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> result = CreateInstance<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, ISugarQueryable<T, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12>>(className);
             return result;
         }
@@ -131,23 +131,23 @@ namespace SqlSugar
             }
             else
             {
-                QueryBuilder result = CreateInstance<QueryBuilder>(GetClassName(currentConnectionConfig.DbType, "QueryBuilder"));
+                QueryBuilder result = CreateInstance<QueryBuilder>(GetClassName(currentConnectionConfig.DbType.ToString(), "QueryBuilder"));
                 return result;
             }
         }
         public static InsertBuilder GetInsertBuilder(ConnectionConfig currentConnectionConfig)
         {
-            InsertBuilder result = CreateInstance<InsertBuilder>(GetClassName(currentConnectionConfig.DbType, "InsertBuilder"));
+            InsertBuilder result = CreateInstance<InsertBuilder>(GetClassName(currentConnectionConfig.DbType.ToString(), "InsertBuilder"));
             return result;
         }
         public static UpdateBuilder GetUpdateBuilder(ConnectionConfig currentConnectionConfig)
         {
-            UpdateBuilder result = CreateInstance<UpdateBuilder>(GetClassName(currentConnectionConfig.DbType, "UpdateBuilder"));
+            UpdateBuilder result = CreateInstance<UpdateBuilder>(GetClassName(currentConnectionConfig.DbType.ToString(), "UpdateBuilder"));
             return result;
         }
         public static DeleteBuilder GetDeleteBuilder(ConnectionConfig currentConnectionConfig)
         {
-            DeleteBuilder result = CreateInstance<DeleteBuilder>(GetClassName(currentConnectionConfig.DbType, "DeleteBuilder"));
+            DeleteBuilder result = CreateInstance<DeleteBuilder>(GetClassName(currentConnectionConfig.DbType.ToString(), "DeleteBuilder"));
             return result;
         }
 
@@ -159,44 +159,44 @@ namespace SqlSugar
             }
             else
             {
-                ILambdaExpressions result = CreateInstance<ILambdaExpressions>(GetClassName(currentConnectionConfig.DbType, "ExpressionContext"));
+                ILambdaExpressions result = CreateInstance<ILambdaExpressions>(GetClassName(currentConnectionConfig.DbType.ToString(), "ExpressionContext"));
                 return result;
             }
         }
 
         public static ISqlBuilder GetSqlbuilder(ConnectionConfig currentConnectionConfig)
         {
-            ISqlBuilder result = CreateInstance<ISqlBuilder>(GetClassName(currentConnectionConfig.DbType, "Builder"));
+            ISqlBuilder result = CreateInstance<ISqlBuilder>(GetClassName(currentConnectionConfig.DbType.ToString(), "Builder"));
             return result;
         }
 
         public static IDbBind GetDbBind(ConnectionConfig currentConnectionConfig)
         {
-            IDbBind result = CreateInstance<IDbBind>(GetClassName(currentConnectionConfig.DbType, "DbBind"));
+            IDbBind result = CreateInstance<IDbBind>(GetClassName(currentConnectionConfig.DbType.ToString(), "DbBind"));
             return result;
         }
 
         public static IDbMaintenance GetDbMaintenance(ConnectionConfig currentConnectionConfig)
         {
-            IDbMaintenance result = CreateInstance<IDbMaintenance>(GetClassName(currentConnectionConfig.DbType, "DbMaintenance"));
+            IDbMaintenance result = CreateInstance<IDbMaintenance>(GetClassName(currentConnectionConfig.DbType.ToString(), "DbMaintenance"));
             return result;
         }
 
         public static IDbFirst GetDbFirst(ConnectionConfig currentConnectionConfig)
         {
-            IDbFirst result = CreateInstance<IDbFirst>(GetClassName(currentConnectionConfig.DbType, "DbFirst"));
+            IDbFirst result = CreateInstance<IDbFirst>(GetClassName(currentConnectionConfig.DbType.ToString(), "DbFirst"));
             return result;
         }
 
         public static ICodeFirst GetCodeFirst(ConnectionConfig currentConnectionConfig)
         {
-            ICodeFirst result = CreateInstance<ICodeFirst>(GetClassName(currentConnectionConfig.DbType, "CodeFirst"));
+            ICodeFirst result = CreateInstance<ICodeFirst>(GetClassName(currentConnectionConfig.DbType.ToString(), "CodeFirst"));
             return result;
         }
 
         public static IAdo GetAdo(ConnectionConfig currentConnectionConfig)
         {
-            IAdo result = CreateInstance<IAdo>(GetClassName(currentConnectionConfig.DbType, "Provider"));
+            IAdo result = CreateInstance<IAdo>(GetClassName(currentConnectionConfig.DbType.ToString(), "Provider"));
             return result;
         }
 
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IDeleteable.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IDeleteable.cs
index 8ccac6cee..a564e051f 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IDeleteable.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IDeleteable.cs
@@ -9,7 +9,9 @@ namespace SqlSugar
 {
     public interface IDeleteable<T> where T : class, new()
     {
+        DeleteBuilder DeleteBuilder { get; set; }
         int ExecuteCommand();
+        Task<int> ExecuteCommandAsync();
         IDeleteable<T> AS(string tableName);
         IDeleteable<T> With(string lockString);
         IDeleteable<T> Where(T deleteObj);
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IQueryable.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IQueryable.cs
index e72d4a6cd..5bfa66e1f 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IQueryable.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IQueryable.cs
@@ -5,12 +5,15 @@ using System.Data.SqlClient;
 using System.Linq;
 using System.Linq.Expressions;
 using System.Text;
+using System.Threading.Tasks;
+
 namespace SqlSugar
 {
     public partial interface ISugarQueryable<T>
     {
         SqlSugarClient Context { get; set; }
         ISqlBuilder SqlBuilder { get; set; }
+        QueryBuilder QueryBuilder { get; set; }
 
         ISugarQueryable<T> AS<T2>(string tableName);
         ISugarQueryable<T> AS(string tableName);
@@ -51,45 +54,67 @@ namespace SqlSugar
         ISugarQueryable<T> Take(int num);
 
         T Single();
+        Task<T> SingleAsync();
         T Single(Expression<Func<T, bool>> expression);
+        Task<T> SingleAsync(Expression<Func<T, bool>> expression);
 
         T First();
+        Task<T> FirstAsync();
         T First(Expression<Func<T, bool>> expression);
+        Task<T>  FirstAsync(Expression<Func<T, bool>> expression);
 
         bool Any(Expression<Func<T, bool>> expression);
+        Task<bool> AnyAsync(Expression<Func<T, bool>> expression);
         bool Any();
- 
+        Task<bool> AnyAsync();
+
         ISugarQueryable<TResult> Select<TResult>(Expression<Func<T, TResult>> expression);
         ISugarQueryable<TResult> Select<TResult>(string select);
         ISugarQueryable<T> Select(string select);
         ISugarQueryable<T> MergeTable();
 
         int Count();
+        Task<int> CountAsync();
         TResult Max<TResult>(string maxField);
+        Task<TResult> MaxAsync<TResult>(string maxField);
         TResult Max<TResult>(Expression<Func<T, TResult>> expression);
+        Task<TResult> MaxAsync<TResult>(Expression<Func<T, TResult>> expression);
         TResult Min<TResult>(string minField);
+        Task<TResult> MinAsync<TResult>(string minField);
         TResult Min<TResult>(Expression<Func<T, TResult>> expression);
+        Task<TResult> MinAsync<TResult>(Expression<Func<T, TResult>> expression);
         TResult Sum<TResult>(string sumField);
+        Task<TResult> SumAsync<TResult>(string sumField);
         TResult Sum<TResult>(Expression<Func<T, TResult>> expression);
+        Task<TResult> SumAsync<TResult>(Expression<Func<T, TResult>> expression);
         TResult Avg<TResult>(string avgField);
+        Task<TResult> AvgAsync<TResult>(string avgField);
         TResult Avg<TResult>(Expression<Func<T, TResult>> expression);
+        Task<TResult> AvgAsync<TResult>(Expression<Func<T, TResult>> expression);
 
         List<T> ToList();
+        Task<List<T>> ToListAsync();
 
         string ToJson();
+        Task<string> ToJsonAsync();
         string ToJsonPage(int pageIndex, int pageSize);
+        Task<string> ToJsonPageAsync(int pageIndex, int pageSize);
         string ToJsonPage(int pageIndex, int pageSize, ref int totalNumber);
-
+        Task<KeyValuePair<string,int>> ToJsonPageAsync(int pageIndex, int pageSize, int totalNumber);
         KeyValuePair<string, List<SugarParameter>> ToSql();
 
 
         DataTable ToDataTable();
+        Task<DataTable> ToDataTableAsync();
         DataTable ToDataTablePage(int pageIndex, int pageSize);
+        Task<DataTable> ToDataTablePageAsync(int pageIndex, int pageSize);
         DataTable ToDataTablePage(int pageIndex, int pageSize, ref int totalNumber);
+        Task<KeyValuePair<DataTable,int>> ToDataTablePageAsync(int pageIndex, int pageSize, int totalNumber);
 
         List<T> ToPageList(int pageIndex, int pageSize);
+        Task<List<T>> ToPageListAsync(int pageIndex, int pageSize);
         List<T> ToPageList(int pageIndex, int pageSize, ref int totalNumber);
-
+        Task<KeyValuePair<List<T>,int>> ToPageListAsync(int pageIndex, int pageSize, int totalNumber);
         void Clear();
     }
     public partial interface ISugarQueryable<T, T2> : ISugarQueryable<T>
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IUpdateable.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IUpdateable.cs
index 1304fbee5..1de0a953d 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IUpdateable.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/IUpdateable.cs
@@ -7,9 +7,11 @@ using System.Threading.Tasks;
 
 namespace SqlSugar
 {
-    public interface IUpdateable<T>
+    public interface IUpdateable<T> where T : class, new()
     {
+        UpdateBuilder UpdateBuilder { get; set; }
         int ExecuteCommand();
+        Task<int> ExecuteCommandAsync();
         IUpdateable<T> AS(string tableName);
         IUpdateable<T> With(string lockString);
         IUpdateable<T> Where(bool isNoUpdateNull,bool IsOffIdentity = false);
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/Insertable.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/Insertable.cs
index a722476b8..862739ccd 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/Insertable.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Interface/Insertable.cs
@@ -9,11 +9,17 @@ namespace SqlSugar
 {
     public interface IInsertable<T>
     {
+        InsertBuilder InsertBuilder { get; set; }
         int ExecuteCommand();
+        Task<int> ExecuteCommandAsync();
         int ExecuteReturnIdentity();
+        Task<int> ExecuteReturnIdentityAsync();
         T ExecuteReturnEntity();
+        Task<T> ExecuteReturnEntityAsync();
         bool ExecuteCommandIdentityIntoEntity();
+        Task<bool> ExecuteCommandIdentityIntoEntityAsync();
         long ExecuteReturnBigIdentity();
+        Task<long> ExecuteReturnBigIdentityAsync();
         IInsertable<T> AS(string tableName);
         IInsertable<T> With(string lockString);
         IInsertable<T> InsertColumns(Expression<Func<T, object>> columns);
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/SqlServer/DbMaintenance/SqlServerDbMaintenance.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/SqlServer/DbMaintenance/SqlServerDbMaintenance.cs
index e31095aa6..64b221bd1 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/SqlServer/DbMaintenance/SqlServerDbMaintenance.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/Realization/SqlServer/DbMaintenance/SqlServerDbMaintenance.cs
@@ -12,7 +12,7 @@ namespace SqlSugar
         {
             get
             {
-                string sql = @"SELECT Sysobjects.name AS TableName,
+                string sql = @"SELECT sysobjects.name AS TableName,
                            syscolumns.Id AS TableId,
                            syscolumns.name AS DbColumnName,
                            systypes.name AS DataType,
@@ -60,7 +60,7 @@ namespace SqlSugar
             {
                 return @"SELECT s.Name,Convert(varchar(max),tbp.value) as Description
                             FROM sysobjects s
-					     	LEFT JOIN sys.extended_properties as tbp ON s.id=tbp.major_id and tbp.minor_id=0  WHERE s.xtype IN('U') AND (tbp.Name='MS_Description' OR tbp.Name is null)";
+					     	LEFT JOIN sys.extended_properties as tbp ON s.id=tbp.major_id and tbp.minor_id=0 AND (tbp.Name='MS_Description' OR tbp.Name is null)  WHERE s.xtype IN('U') ";
             }
         }
         protected override string GetViewInfoListSql
@@ -69,7 +69,7 @@ namespace SqlSugar
             {
                 return @"SELECT s.Name,Convert(varchar(max),tbp.value) as Description
                             FROM sysobjects s
-					     	LEFT JOIN sys.extended_properties as tbp ON s.id=tbp.major_id and tbp.minor_id=0  WHERE s.xtype IN('V')  AND (tbp.Name='MS_Description' OR tbp.Name is null)";
+					     	LEFT JOIN sys.extended_properties as tbp ON s.id=tbp.major_id and tbp.minor_id=0  AND (tbp.Name='MS_Description' OR tbp.Name is null) WHERE s.xtype IN('V')  ";
             }
         }
         #endregion
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugar.csproj b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugar.csproj
index 56ee234d5..adca1d16a 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugar.csproj
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugar.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
-    <Version>4.5.0.2</Version>
+    <Version>4.5.1</Version>
     <Copyright>sunkaixuan</Copyright>
     <PackageProjectUrl>https://github.com/sunkaixuan/SqlSugar</PackageProjectUrl>
     <PackageLicenseUrl></PackageLicenseUrl>
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarClient.cs b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarClient.cs
index 52ae2e438..f2be29e5b 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarClient.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarClient.cs
@@ -565,6 +565,14 @@ namespace SqlSugar
                 this.Ado.Dispose();
             }
         }
+        internal SqlSugarClient CopyContext(ConnectionConfig config)
+        {
+            var newClient = new SqlSugarClient(config);
+            newClient.MappingColumns = this.Context.MappingColumns;
+            newClient.MappingTables = this.Context.MappingTables;
+            newClient.IgnoreColumns = this.Context.IgnoreColumns;
+            return newClient;
+        }
         #endregion
     }
 }
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarForCore.nuspec b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarForCore.nuspec
index f94c6e362..f56a5110f 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarForCore.nuspec
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqlSugar/SqlSugarForCore.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>sqlSugarCore</id>
-    <version>4.5.0.2</version>
+    <version>4.5.1</version>
     <authors>sunkaixuan</authors>
     <owners>Landa</owners>
     <licenseUrl>http://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqliteTest/DataBase/SqlSugar4xTest.sqlite b/Src/Asp.NetCore2/SqlSeverTest/SqliteTest/DataBase/SqlSugar4xTest.sqlite
index 63aad0f6a..9ff5e9ad4 100644
Binary files a/Src/Asp.NetCore2/SqlSeverTest/SqliteTest/DataBase/SqlSugar4xTest.sqlite and b/Src/Asp.NetCore2/SqlSeverTest/SqliteTest/DataBase/SqlSugar4xTest.sqlite differ
diff --git a/Src/Asp.NetCore2/SqlSeverTest/SqliteTest/Demos/1_Query.cs b/Src/Asp.NetCore2/SqlSeverTest/SqliteTest/Demos/1_Query.cs
index 02a8c959b..517248c2c 100644
--- a/Src/Asp.NetCore2/SqlSeverTest/SqliteTest/Demos/1_Query.cs
+++ b/Src/Asp.NetCore2/SqlSeverTest/SqliteTest/Demos/1_Query.cs
@@ -166,7 +166,7 @@ namespace OrmTest.Demo
             var getNew = db.Queryable<Student>().Where(it => it.Id == 1).Select(it => new { id = SqlFunc.IIF(it.Id == 0, 1, it.Id), it.Name, it.SchoolId }).ToList();
             var getAllNoLock = db.Queryable<Student>().With(SqlWith.NoLock).ToList();
             var getByPrimaryKey = db.Queryable<Student>().InSingle(2);
-            var getSingleOrDefault = db.Queryable<Student>().Single();
+            var getSingleOrDefault = db.Queryable<Student>().Where(it => it.Id == 1).Single();
             var getFirstOrDefault = db.Queryable<Student>().First();
             var getByWhere = db.Queryable<Student>().Where(it => it.Id == 1 || it.Name == "a").ToList();
             var getByFuns = db.Queryable<Student>().Where(it => SqlFunc.IsNullOrEmpty(it.Name)).ToList();