diff --git a/lib/dbh/dbh.class.php b/lib/dbh/dbh.class.php
index b3bf1fc1e1..90a37695e8 100644
--- a/lib/dbh/dbh.class.php
+++ b/lib/dbh/dbh.class.php
@@ -136,9 +136,11 @@ class dbh
         /* Mysql driver include mysql and oceanbase. */
         if($driver == 'mysql')
         {
-            $collation = $dbConfig->collation ?? 'utf8mb4_general_ci';
-            $queries[] = "SET NAMES {$dbConfig->encoding}";
-            $queries[] = "SET COLLATION_CONNECTION = '{$collation}'";
+            $encoding  = strtolower($dbConfig->encoding ?? 'utf8mb4');
+            $collation = strtolower($dbConfig->collation ?? 'utf8mb4_general_ci');
+            if($encoding !== 'utf8mb4') $encoding = 'utf8mb4';
+            if(strpos($collation, $encoding) !== 0) $collation = 'utf8mb4_general_ci';
+            $queries[] = "SET NAMES {$encoding} COLLATE '{$collation}'";
             if(isset($dbConfig->strictMode) && empty($dbConfig->strictMode)) $queries[] = "SET @@sql_mode= ''";
         }
         else