diff --git a/orm_lib/src/DbClientImpl.cc b/orm_lib/src/DbClientImpl.cc
index 9b85d4e3..92d19c31 100644
--- a/orm_lib/src/DbClientImpl.cc
+++ b/orm_lib/src/DbClientImpl.cc
@@ -274,19 +274,13 @@ void DbClientImpl::handleNewTask(const DbConnectionPtr &connPtr)
             {
                 _busyConnections.insert(connPtr); //For new connections, this sentence is necessary
                 auto &cmd = _sqlCmdBuffer.front();
-                connPtr->loop()->queueInLoop([connPtr, cmd, this]() {
-                    execSql(connPtr, std::move(cmd->_sql), cmd->_paraNum, std::move(cmd->_parameters), std::move(cmd->_length), std::move(cmd->_format), std::move(cmd->_cb), std::move(cmd->_exceptCb));
-                });
+                execSql(connPtr, std::move(cmd->_sql), cmd->_paraNum, std::move(cmd->_parameters), std::move(cmd->_length), std::move(cmd->_format), std::move(cmd->_cb), std::move(cmd->_exceptCb));
                 _sqlCmdBuffer.pop_front();
                 return;
             }
-        }
-        //Idle connection
-        connPtr->loop()->queueInLoop([connPtr, this]() {
-            std::lock_guard<std::mutex> guard(_connectionsMutex);
             _busyConnections.erase(connPtr);
             _readyConnections.insert(connPtr);
-        });
+        }
     }
 }
 
diff --git a/orm_lib/src/DbConnection.h b/orm_lib/src/DbConnection.h
index 9fec52ef..6e256779 100644
--- a/orm_lib/src/DbConnection.h
+++ b/orm_lib/src/DbConnection.h
@@ -78,7 +78,7 @@ class DbConnection : public trantor::NonCopyable
   protected:
     QueryCallback _cb;
     trantor::EventLoop *_loop;
-    std::function<void()> _idleCb;
+    std::shared_ptr<std::function<void()>> _idleCbPtr;
     ConnectStatus _status = ConnectStatus_None;
     DbConnectionCallback _closeCb = [](const DbConnectionPtr &) {};
     DbConnectionCallback _okCb = [](const DbConnectionPtr &) {};
diff --git a/orm_lib/src/TransactionImpl.cc b/orm_lib/src/TransactionImpl.cc
index 549ebecc..d3e6a5d9 100644
--- a/orm_lib/src/TransactionImpl.cc
+++ b/orm_lib/src/TransactionImpl.cc
@@ -150,13 +150,15 @@ void TransactionImpl::rollback()
             SqlCmd cmd;
             cmd._sql = "rollback";
             cmd._paraNum = 0;
-            cmd._cb = [clearupCb](const Result &r) {
+            cmd._cb = [](const Result &r) {
                 LOG_TRACE << "Transaction roll back!";
-                clearupCb();
+                //clearupCb();
             };
-            cmd._exceptCb = [clearupCb](const std::exception_ptr &ePtr) {
-                clearupCb();
+            cmd._exceptCb = [](const std::exception_ptr &ePtr) {
+                //clearupCb();
+                LOG_ERROR << "Transaction rool back error";
             };
+            cmd._idleCb = clearupCb;
             //Rollback cmd should be executed firstly, so we push it in front of the list
             thisPtr->_sqlCmdBuffer.push_front(std::move(cmd));
             return;
@@ -169,14 +171,16 @@ void TransactionImpl::rollback()
                       std::vector<const char *>(),
                       std::vector<int>(),
                       std::vector<int>(),
-                      [clearupCb](const Result &r) {
+                      [](const Result &r) {
                           LOG_TRACE << "Transaction roll back!";
-                          clearupCb();
+                          //clearupCb();
                       },
-                      [clearupCb](const std::exception_ptr &ePtr) {
-                          clearupCb();
+                      [](const std::exception_ptr &ePtr) {
+                          //clearupCb();
+                          LOG_ERROR << "Transaction rool back error";
                       },
-                      [thisPtr]() {
+                      [thisPtr, clearupCb]() {
+                          clearupCb();
                           thisPtr->execNewTask();
                       });
     });
@@ -204,11 +208,14 @@ void TransactionImpl::execNewTask()
                               std::move(cmd._format),
                               std::move(cmd._cb),
                               [cmd, thisPtr](const std::exception_ptr &ePtr) {
-                                  thisPtr->rollback();
+                                  if (!cmd._idleCb)
+                                      thisPtr->rollback();
                                   if (cmd._exceptCb)
                                       cmd._exceptCb(ePtr);
                               },
-                              [thisPtr]() {
+                              [cmd,thisPtr]() {
+                                  if(cmd._idleCb)
+                                      cmd._idleCb();
                                   thisPtr->execNewTask();
                               });
             });
diff --git a/orm_lib/src/TransactionImpl.h b/orm_lib/src/TransactionImpl.h
index dc26fc34..cdaec271 100644
--- a/orm_lib/src/TransactionImpl.h
+++ b/orm_lib/src/TransactionImpl.h
@@ -57,6 +57,7 @@ class TransactionImpl : public Transaction, public std::enable_shared_from_this<
         std::vector<int> _format;
         QueryCallback _cb;
         ExceptPtrCallback _exceptCb;
+        std::function<void()> _idleCb;
     };
     std::list<SqlCmd> _sqlCmdBuffer;
     //   std::mutex _bufferMutex;
diff --git a/orm_lib/src/mysql_impl/MysqlConnection.cc b/orm_lib/src/mysql_impl/MysqlConnection.cc
index 939b613e..ba8013af 100644
--- a/orm_lib/src/mysql_impl/MysqlConnection.cc
+++ b/orm_lib/src/mysql_impl/MysqlConnection.cc
@@ -311,7 +311,7 @@ void MysqlConnection::execSql(std::string &&sql,
     assert(!sql.empty());
 
     _cb = std::move(rcb);
-    _idleCb = std::move(idleCb);
+    _idleCbPtr = std::make_shared<std::function<void()>>(std ::move(idleCb));
     _isWorking = true;
     _exceptCb = std::move(exceptCallback);
     _sql.clear();
@@ -431,10 +431,11 @@ void MysqlConnection::outputError()
 
         _cb = decltype(_cb)();
         _isWorking = false;
-        if (_idleCb)
+        if (_idleCbPtr)
         {
-            _idleCb();
-            _idleCb = decltype(_idleCb)();
+            auto idle = std::move(_idleCbPtr);
+            _idleCbPtr.reset();
+            (*idle)();
         }
     }
 }
@@ -451,7 +452,11 @@ void MysqlConnection::getResult(MYSQL_RES *res)
         _cb = decltype(_cb)();
         _exceptCb = decltype(_exceptCb)();
         _isWorking = false;
-        _idleCb();
-        _idleCb = decltype(_idleCb)();
+        if (_idleCbPtr)
+        {
+            auto idle = std::move(_idleCbPtr);
+            _idleCbPtr.reset();
+            (*idle)();
+        }
     }
 }
diff --git a/orm_lib/src/postgresql_impl/PgConnection.cc b/orm_lib/src/postgresql_impl/PgConnection.cc
index 3466ae90..46d463e8 100644
--- a/orm_lib/src/postgresql_impl/PgConnection.cc
+++ b/orm_lib/src/postgresql_impl/PgConnection.cc
@@ -16,6 +16,7 @@
 #include "PostgreSQLResultImpl.h"
 #include <trantor/utils/Logger.h>
 #include <drogon/orm/Exception.h>
+#include <memory>
 #include <stdio.h>
 
 using namespace drogon::orm;
@@ -166,14 +167,55 @@ void PgConnection::execSql(std::string &&sql,
     assert(!sql.empty());
     _sql = std::move(sql);
     _cb = std::move(rcb);
-    _idleCb = std::move(idleCb);
+    _idleCbPtr = std::make_shared<std::function<void()>>(std::move(idleCb));
     _isWorking = true;
     _exceptCb = std::move(exceptCallback);
     auto thisPtr = shared_from_this();
-    _loop->runInLoop([thisPtr, paraNum = std::move(paraNum), parameters = std::move(parameters), length = std::move(length), format = std::move(format)]() {
+    if (!_loop->isInLoopThread())
+    {
+        _loop->queueInLoop([thisPtr, paraNum = std::move(paraNum), parameters = std::move(parameters), length = std::move(length), format = std::move(format)]() {
+            if (PQsendQueryParams(
+                    thisPtr->_connPtr.get(),
+                    thisPtr->_sql.c_str(),
+                    paraNum,
+                    NULL,
+                    parameters.data(),
+                    length.data(),
+                    format.data(),
+                    0) == 0)
+            {
+                LOG_ERROR << "send query error: " << PQerrorMessage(thisPtr->_connPtr.get());
+                if (thisPtr->_isWorking)
+                {
+                    thisPtr->_isWorking = false;
+                    try
+                    {
+                        throw Failure(PQerrorMessage(thisPtr->_connPtr.get()));
+                    }
+                    catch (...)
+                    {
+                        auto exceptPtr = std::current_exception();
+                        thisPtr->_exceptCb(exceptPtr);
+                        thisPtr->_exceptCb = decltype(_exceptCb)();
+                    }
+                    thisPtr->_cb = decltype(_cb)();
+                    if (thisPtr->_idleCbPtr)
+                    {
+                        auto idle = std::move(thisPtr->_idleCbPtr);
+                        thisPtr->_idleCbPtr.reset();
+                        (*idle)();
+                    }
+                }
+                return;
+            }
+            thisPtr->pgPoll();
+        });
+    }
+    else
+    {
         if (PQsendQueryParams(
-                thisPtr->_connPtr.get(),
-                thisPtr->_sql.c_str(),
+                _connPtr.get(),
+                _sql.c_str(),
                 paraNum,
                 NULL,
                 parameters.data(),
@@ -182,9 +224,31 @@ void PgConnection::execSql(std::string &&sql,
                 0) == 0)
         {
             LOG_ERROR << "send query error: " << PQerrorMessage(thisPtr->_connPtr.get());
+            if (_isWorking)
+            {
+                _isWorking = false;
+                try
+                {
+                    throw Failure(PQerrorMessage(_connPtr.get()));
+                }
+                catch (...)
+                {
+                    auto exceptPtr = std::current_exception();
+                    _exceptCb(exceptPtr);
+                    _exceptCb = decltype(_exceptCb)();
+                }
+                _cb = decltype(_cb)();
+                if (_idleCbPtr)
+                {
+                    auto idle = std::move(_idleCbPtr);
+                    _idleCbPtr.reset();
+                    (*idle)();
+                }
+            }
+            return;
         }
         thisPtr->pgPoll();
-    });
+    }
 }
 
 void PgConnection::handleRead()
@@ -209,10 +273,11 @@ void PgConnection::handleRead()
                 _exceptCb = decltype(_exceptCb)();
             }
             _cb = decltype(_cb)();
-            if (_idleCb)
+            if (_idleCbPtr)
             {
-                _idleCb();
-                _idleCb = decltype(_idleCb)();
+                auto idle = std::move(_idleCbPtr);
+                _idleCbPtr.reset();
+                (*idle)();
             }
         }
         handleClosed();
@@ -225,7 +290,6 @@ void PgConnection::handleRead()
     }
     if (_channel.isWriting())
         _channel.disableWriting();
-    // got query results?
     while ((res = std::shared_ptr<PGresult>(PQgetResult(_connPtr.get()), [](PGresult *p) {
                 PQclear(p);
             })))
@@ -236,18 +300,15 @@ void PgConnection::handleRead()
             LOG_WARN << PQerrorMessage(_connPtr.get());
             if (_isWorking)
             {
+                try
                 {
-                    try
-                    {
-                        //TODO: exception type
-                        throw SqlError(PQerrorMessage(_connPtr.get()),
-                                       _sql);
-                    }
-                    catch (...)
-                    {
-                        _exceptCb(std::current_exception());
-                        _exceptCb = decltype(_exceptCb)();
-                    }
+                    //TODO: exception type
+                    throw SqlError(PQerrorMessage(_connPtr.get()), _sql);
+                }
+                catch (...)
+                {
+                    _exceptCb(std::current_exception());
+                    _exceptCb = decltype(_exceptCb)();
                 }
                 _cb = decltype(_cb)();
             }
@@ -266,10 +327,11 @@ void PgConnection::handleRead()
     if (_isWorking)
     {
         _isWorking = false;
-        if (_idleCb)
+        if (_idleCbPtr)
         {
-            _idleCb();
-            _idleCb = decltype(_idleCb)();
+            auto idle = std::move(_idleCbPtr);
+            _idleCbPtr.reset();
+            (*idle)();
         }
     }
 }