diff --git a/framework/base/router.class.php b/framework/base/router.class.php
index 0af23871f7..102e191318 100644
--- a/framework/base/router.class.php
+++ b/framework/base/router.class.php
@@ -3403,7 +3403,7 @@ class baseRouter
 
         $fh = fopen($sqlLog, 'a');
         fwrite($fh, date('Ymd H:i:s') . ": " . $this->getURI() . "\n");
-        foreach(dao::$querys as $query) fwrite($fh, "  $query\n");
+        foreach(dbh::$queries as $query) fwrite($fh, "  $query\n");
         fwrite($fh, "\n");
         fclose($fh);
     }
diff --git a/lib/dbh/dbh.class.php b/lib/dbh/dbh.class.php
index 74bcc77b06..3ca545287b 100644
--- a/lib/dbh/dbh.class.php
+++ b/lib/dbh/dbh.class.php
@@ -90,15 +90,24 @@ class dbh
         $pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_OBJ);
         $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
 
+        $queries = [];
         /* Mysql driver include mysql and oceanbase. */
         if($driver == 'mysql')
         {
-            $pdo->exec("SET NAMES {$config->encoding}");
-            if(isset($config->strictMode) and $config->strictMode == false) $pdo->exec("SET @@sql_mode= ''");
+            $queries[] = "SET NAMES {$config->encoding}";
+            if(isset($config->strictMode) && empty($config->strictMode)) $queries[] = "SET @@sql_mode= ''";
         }
         else if($setSchema)
         {
-            $pdo->exec("SET SCHEMA {$config->name}");
+            $queries[] = "SET SCHEMA {$config->name}";
+        }
+        if(!empty($queries))
+        {
+            foreach($queries as $query)
+            {
+                $pdo->exec($query);
+                dbh::$queries[] = "[$flag] " . $query;
+            }
         }
 
         $this->pdo    = $pdo;
@@ -136,7 +145,7 @@ class dbh
 
         try
         {
-            if(class_exists('dao')) dao::$querys[] = "[$this->flag] " . dao::processKeywords($sql);
+            dbh::$queries[] = "[$this->flag] " . dao::processKeywords($sql);
             return $this->pdo->exec($sql);
         }
         catch(PDOException $e)
@@ -158,7 +167,7 @@ class dbh
         $sql = $this->formatSQL($sql);
         try
         {
-            if(class_exists('dao')) dao::$querys[] = "[$this->flag] " . dao::processKeywords($sql);
+            dbh::$queries[] = "[$this->flag] " . dao::processKeywords($sql);
             return $this->pdo->query($sql);
         }
         catch(PDOException $e)
@@ -225,7 +234,7 @@ class dbh
     {
         try
         {
-            if(class_exists('dao')) dao::$querys[] = "[$this->flag] " . dao::processKeywords($sql);
+            dbh::$queries[] = "[$this->flag] " . dao::processKeywords($sql);
             return $this->pdo->query($sql);
         }
         catch(PDOException $e)
diff --git a/lib/trace/trace.class.php b/lib/trace/trace.class.php
index 974b988987..4fdbedad30 100644
--- a/lib/trace/trace.class.php
+++ b/lib/trace/trace.class.php
@@ -43,7 +43,7 @@ class trace
             'method'   => $this->app->server->request_method,
             'timeUsed' => round(getTime() - $this->app->startTime, 4) * 1000,
             'memory'   => round(memory_get_peak_usage() / 1024, 1),
-            'querys'   => count(dao::$querys),
+            'querys'   => count(dbh::$queries),
             'caches'   => 0,
             'files'    => count(get_included_files()),
             'session'  => session_id(),
@@ -70,7 +70,7 @@ class trace
      */
     public function getRequestSqls()
     {
-        $this->trace['sqlQuery'] = dao::$querys;
+        $this->trace['sqlQuery'] = dbh::$queries;
     }
 
     /**
diff --git a/module/common/model.php b/module/common/model.php
index 34f83cf79f..a4faa6f1eb 100644
--- a/module/common/model.php
+++ b/module/common/model.php
@@ -516,7 +516,7 @@ class commonModel extends model
     {
         $info['timeUsed'] = round(getTime() - $startTime, 4) * 1000;
         $info['memory']   = round(memory_get_peak_usage() / 1024, 1);
-        $info['querys']   = count(dao::$querys);
+        $info['querys']   = count(dbh::$queries);
         vprintf($this->lang->runInfo, $info);
         return $info;
     }
diff --git a/module/todo/model.php b/module/todo/model.php
index 075283c99e..17bffc7f54 100755
--- a/module/todo/model.php
+++ b/module/todo/model.php
@@ -391,7 +391,6 @@ class todoModel extends model
      */
     public function activate(int $todoID): bool
     {
-        $oldTodo = $this->fetchByID($todoID);
         $this->dao->update(TABLE_TODO)->set('status')->eq('wait')->where('id')->eq($todoID)->exec();
 
         $todo = $this->fetchByID($todoID);
diff --git a/module/user/model.php b/module/user/model.php
index 2f1473ac6a..cba2cac97b 100644
--- a/module/user/model.php
+++ b/module/user/model.php
@@ -301,7 +301,7 @@ class userModel extends model
         unset($this->config->user->moreLink);
         if($maxCount && $maxCount == $userCount)
         {
-            if(is_array($usersToAppended)) $usersToAppended = join(',', $usersToAppended);
+            if(is_array($usersToAppended)) $usersToAppended = implode(',', $usersToAppended);
             $moreLinkParams = "params={$params}&usersToAppended={$usersToAppended}";
 
             $moreLink = helper::createLink('user', 'ajaxGetMore');
@@ -749,7 +749,7 @@ class userModel extends model
         sort($oldGroups);
         sort($newGroups);
 
-        if(join(',', $oldGroups) == join(',', $newGroups)) return false;
+        if(implode(',', $oldGroups) == implode(',', $newGroups)) return false;
 
         /* 如果权限组发生变化，则删除原有的权限组，重新创建并更新用户视图。*/
         /* If the group changed, delete the old group, create new group and update user view. */
@@ -1711,7 +1711,7 @@ class userModel extends model
         $programView = '';
         if(!empty($manageObjects['programs']['isAdmin']))
         {
-            $programView = join(',', array_keys($allPrograms));
+            $programView = implode(',', array_keys($allPrograms));
         }
         else
         {
@@ -1730,7 +1730,7 @@ class userModel extends model
                 /* 如果有某个项目集的管理权限，也可以访问该项目集。 */
                 if(strpos(",$managePrograms,", ",$programID,") !== false) $programs[$programID] = $programID;
             }
-            $programView = join(',', $programs);
+            $programView = implode(',', $programs);
         }
 
         return $programView;
@@ -1752,7 +1752,7 @@ class userModel extends model
         $productView = '';
         if(!empty($manageObjects['products']['isAdmin']))
         {
-            $productView = join(',', array_keys($allProducts));
+            $productView = implode(',', array_keys($allProducts));
         }
         else
         {
@@ -1771,7 +1771,7 @@ class userModel extends model
                 /* 如果有某个产品的管理权限，也可以访问该产品。 */
                 if(strpos(",$manageProducts,", ",$productID,") !== false) $products[$productID] = $productID;
             }
-            $productView = join(',', $products);
+            $productView = implode(',', $products);
         }
 
         return $productView;
@@ -1796,7 +1796,7 @@ class userModel extends model
         $projectView = '';
         if(!empty($manageObjects['projects']['isAdmin']))
         {
-            $projectView = join(',', array_keys($allProjects));
+            $projectView = implode(',', array_keys($allProjects));
         }
         else
         {
@@ -1814,7 +1814,7 @@ class userModel extends model
                 /* 如果有某个项目管理权限，也可以访问该项目。 */
                 if(strpos(",$manageProjects,", ",$projectID,") !== false) $projects[$projectID] = $projectID;
             }
-            $projectView = join(',', $projects);
+            $projectView = implode(',', $projects);
         }
 
         return $projectView;
@@ -1838,7 +1838,7 @@ class userModel extends model
         $sprintView = '';
         if(!empty($manageObjects['executions']['isAdmin']))
         {
-            $sprintView = join(',', array_keys($allSprints));
+            $sprintView = implode(',', array_keys($allSprints));
         }
         else
         {
@@ -1855,7 +1855,7 @@ class userModel extends model
                 /* 如果有某个迭代管理权限，也可以访问该迭代。 */
                 if(strpos(",$manageExecutions,", ",$sprintID,") !== false) $sprints[$sprintID] = $sprintID;
             }
-            $sprintView = join(',', $sprints);
+            $sprintView = implode(',', $sprints);
         }
 
         return $sprintView;
@@ -1923,10 +1923,10 @@ class userModel extends model
         $isAdmin = strpos($this->app->company->admins, ',' . $account . ',') !== false;
         if($isAdmin)
         {
-            $userView->programs = join(',', array_keys($allPrograms));
-            $userView->products = join(',', array_keys($allProducts));
-            $userView->projects = join(',', array_keys($allProjects));
-            $userView->sprints  = join(',', array_keys($allSprints));
+            $userView->programs = implode(',', array_keys($allPrograms));
+            $userView->products = implode(',', array_keys($allProducts));
+            $userView->projects = implode(',', array_keys($allProjects));
+            $userView->sprints  = implode(',', array_keys($allSprints));
         }
         else
         {
@@ -2088,9 +2088,9 @@ class userModel extends model
         $openedPrograms = array_keys($this->loadModel('project')->getListByAclAndType('open', 'program'));
         $openedProjects = array_keys($this->project->getListByAclAndType('open', 'project'));
 
-        $userView->products = rtrim($userView->products, ',') . ',' . join(',', $openedProducts);
-        $userView->programs = rtrim($userView->programs, ',') . ',' . join(',', $openedPrograms);
-        $userView->projects = rtrim($userView->projects, ',') . ',' . join(',', $openedProjects);
+        $userView->products = rtrim($userView->products, ',') . ',' . implode(',', $openedProducts);
+        $userView->programs = rtrim($userView->programs, ',') . ',' . implode(',', $openedPrograms);
+        $userView->projects = rtrim($userView->projects, ',') . ',' . implode(',', $openedProjects);
 
         /* 合并用户视图权限到用户访问权限。 */
         $userView = $this->mergeAclsToUserView($account, $userView, $acls, $projects);
@@ -2136,7 +2136,7 @@ class userModel extends model
         $openedSprints = $this->loadModel('project')->getListByAclAndType('open', 'sprint,stage,kanban');
         $openedSprints = array_filter(array_map(function($sprint) use ($userView) { if(strpos(",{$userView->projects},", ",{$sprint->project},") !== false) return $sprint->id; }, $openedSprints));
 
-        $userView->sprints = rtrim($userView->sprints, ',')  . ',' . join(',', $openedSprints);
+        $userView->sprints = rtrim($userView->sprints, ',')  . ',' . implode(',', $openedSprints);
 
         $canViewSprints = $this->dao->select('executions')->from(TABLE_PROJECTADMIN)->where('account')->eq($account)->fetch('executions');
         if($canViewSprints != 'all') $userView->sprints .= ',' . $canViewSprints;