Add ability to specify a transaction mode for SQLite connection

Author: panda-madness

config/database.php

@@ -41,6 +41,7 @@
             'busy_timeout' => null,
             'journal_mode' => null,
             'synchronous' => null,
+            'transaction_mode' => 'DEFERRED',
         ],
 
         'mysql' => [

src/Illuminate/Database/Concerns/ManagesTransactions.php

@@ -3,10 +3,14 @@
 namespace Illuminate\Database\Concerns;
 
 use Closure;
+use Illuminate\Database\Connection;
 use Illuminate\Database\DeadlockException;
 use RuntimeException;
 use Throwable;
 
+/**
+ * @mixin Connection
+ */
 trait ManagesTransactions
 {
     /**
@@ -148,7 +152,7 @@ protected function createTransaction()
             $this->reconnectIfMissingConnection();
 
             try {
-                $this->getPdo()->beginTransaction();
+                $this->executeBeginTransactionStatement();
             } catch (Throwable $e) {
                 $this->handleBeginTransactionException($e);
             }
@@ -184,7 +188,7 @@ protected function handleBeginTransactionException(Throwable $e)
         if ($this->causedByLostConnection($e)) {
             $this->reconnect();
 
-            $this->getPdo()->beginTransaction();
+            $this->executeBeginTransactionStatement();
         } else {
             throw $e;
         }

src/Illuminate/Database/Connection.php

@@ -1493,6 +1493,16 @@ public function unsetTransactionManager()
         $this->transactionsManager = null;
     }
 
+    /**
+     * Run the statement to start a new transaction.
+     *
+     * @return void
+     */
+    public function executeBeginTransactionStatement()
+    {
+        $this->getPdo()->beginTransaction();
+    }
+
     /**
      * Determine if the connection is in a "dry run".
      *

src/Illuminate/Database/SQLiteConnection.php

@@ -100,4 +100,17 @@ protected function getDefaultPostProcessor()
     {
         return new SQLiteProcessor;
     }
+
+    public function executeBeginTransactionStatement()
+    {
+        if (version_compare(PHP_VERSION, '8.4.0')) {
+            $mode = $this->getConfig('transaction_mode') ?? 'DEFERRED';
+
+            $this->getPdo()->exec("BEGIN $mode TRANSACTION");
+
+            return;
+        }
+
+        $this->getPdo()->beginTransaction();
+    }
 }