From c3bed1dab8ec429d100d383ad93410d1cfaa16fb Mon Sep 17 00:00:00 2001
From: John Firebaugh <john.firebaugh@gmail.com>
Date: Mon, 11 Apr 2016 19:46:45 -0700
Subject: [core] Fix race condition that could lead to a UNIQUE constraint
 failure (#4677)

---
 platform/default/sqlite3.hpp | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'platform/default/sqlite3.hpp')

diff --git a/platform/default/sqlite3.hpp b/platform/default/sqlite3.hpp
index abe83a2d44..57ee18e9f3 100644
--- a/platform/default/sqlite3.hpp
+++ b/platform/default/sqlite3.hpp
@@ -88,5 +88,29 @@ private:
     sqlite3_stmt *stmt = nullptr;
 };
 
+class Transaction {
+private:
+    Transaction(const Transaction&) = delete;
+    Transaction(Transaction&&) = delete;
+    Transaction& operator=(const Transaction&) = delete;
+
+public:
+    enum Mode {
+        Deferred,
+        Immediate,
+        Exclusive
+    };
+
+    Transaction(Database&, Mode = Deferred);
+    ~Transaction();
+
+    void commit();
+    void rollback();
+
+private:
+    Database& db;
+    bool needRollback = true;
+};
+
 }
 }
-- 
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