From f176bb0a39676d47d347b1b5b81a6a0753fb66f1 Mon Sep 17 00:00:00 2001
From: Daniel Hensby <dhensby@silverstripe.com>
Date: Fri, 9 Feb 2018 11:24:35 +0000
Subject: [PATCH] FIX Add nested transaction support

---
 code/SQLite3Database.php | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/code/SQLite3Database.php b/code/SQLite3Database.php
index 44f83a0..dbb64b1 100644
--- a/code/SQLite3Database.php
+++ b/code/SQLite3Database.php
@@ -50,6 +50,11 @@ class SQLite3Database extends Database
      */
     protected $livesInMemory = false;
 
+    /**
+     * @var bool
+     */
+    protected $transactionNesting = 0;
+
     /**
      * List of default pragma values
      *
@@ -448,7 +453,12 @@ class SQLite3Database extends Database
 
     public function transactionStart($transaction_mode = false, $session_characteristics = false)
     {
-        $this->query('BEGIN');
+        if ($this->transactionNesting > 0) {
+            $this->transactionSavepoint('NESTEDTRANSACTION' . $this->transactionNesting);
+        } else {
+            $this->query('BEGIN');
+        }
+        ++$this->transactionNesting;
     }
 
     public function transactionSavepoint($savepoint)
@@ -461,13 +471,22 @@ class SQLite3Database extends Database
         if ($savepoint) {
             $this->query("ROLLBACK TO $savepoint;");
         } else {
-            $this->query('ROLLBACK;');
+            --$this->transactionNesting;
+            if ($this->transactionNesting > 0) {
+                $this->transactionRollback('NESTEDTRANSACTION' . $this->transactionNesting);
+            } else {
+                $this->query('ROLLBACK;');
+            }
         }
     }
 
     public function transactionEnd($chain = false)
     {
-        $this->query('COMMIT;');
+        --$this->transactionNesting;
+        if ($this->transactionNesting <= 0) {
+            $this->transactionNesting = 0;
+            $this->query('COMMIT;');
+        }
     }
 
     public function clearTable($table)