From 0db070bcf2d44fa85e15a5f9d0194b1b7a80e598 Mon Sep 17 00:00:00 2001
From: jay817 <jaewooklee.dev@gmail.com>
Date: Fri, 23 Aug 2024 08:07:11 -0400
Subject: [PATCH] Update sqlite3/db.py

---
 sqlite3/db.py | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/sqlite3/db.py b/sqlite3/db.py
index ecf1d89..ab7e0b8 100644
--- a/sqlite3/db.py
+++ b/sqlite3/db.py
@@ -49,4 +49,13 @@ class DB(sqlite3.Connection):
             ''', (pattern,)).fetchall()
         return [row[0] for row in result]
 
-    def __repr__(self): return repr(self.keys())
\ No newline at end of file
+    def __repr__(self): return repr(self.keys())
+
+    def exists(self, key):
+        with self:
+            cur = self.execute('''
+                SELECT 1 FROM kv_store
+                WHERE key = ?
+                LIMIT 1
+            ''', (key,))
+            return bool(cur.fetchone())
\ No newline at end of file