diff --git a/src/database.js.c b/src/database.js.c
index c20cf80c..b309d05f 100644
--- a/src/database.js.c
+++ b/src/database.js.c
@@ -23,6 +23,7 @@ static void _database_finalizer(JSRuntime *runtime, JSValue value);
 
 static JSValue _database_get(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
 static JSValue _database_set(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
+static JSValue _database_exchange(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
 static JSValue _database_remove(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
 static JSValue _database_get_all(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
 static JSValue _database_get_like(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv);
@@ -72,6 +73,7 @@ static JSValue _database_create(JSContext* context, JSValueConst this_val, int a
 
 	JS_SetPropertyStr(context, object, "get", JS_NewCFunction(context, _database_get, "get", 1));
 	JS_SetPropertyStr(context, object, "set", JS_NewCFunction(context, _database_set, "set", 2));
+	JS_SetPropertyStr(context, object, "exchange", JS_NewCFunction(context, _database_exchange, "exchange", 2));
 	JS_SetPropertyStr(context, object, "remove", JS_NewCFunction(context, _database_remove, "remove", 1));
 	JS_SetPropertyStr(context, object, "getAll", JS_NewCFunction(context, _database_get_all, "getAll", 0));
 	JS_SetPropertyStr(context, object, "getLike", JS_NewCFunction(context, _database_get_like, "getLike", 1));
@@ -140,6 +142,36 @@ JSValue _database_set(JSContext* context, JSValueConst this_val, int argc, JSVal
 	return JS_UNDEFINED;
 }
 
+static JSValue _database_exchange(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv)
+{
+	JSValue exchanged = JS_UNDEFINED;
+	database_t* database = JS_GetOpaque(this_val, _database_class_id);
+	if (database)
+	{
+		sqlite3_stmt* statement;
+		if (sqlite3_prepare(database->db, "UPDATE properties SET value = $1 WHERE id = $2 AND key = $3 AND value = $4", -1, &statement, NULL) == SQLITE_OK)
+		{
+			size_t key_length;
+			size_t expected_length;
+			size_t set_length;
+			const char* key = JS_ToCStringLen(context, &key_length, argv[0]);
+			const char* expected = JS_ToCStringLen(context, &expected_length, argv[1]);
+			const char* set = JS_ToCStringLen(context, &set_length, argv[2]);
+			if (sqlite3_bind_text(statement, 1, set, set_length, NULL) == SQLITE_OK &&
+				sqlite3_bind_text(statement, 2, database->id, -1, NULL) == SQLITE_OK &&
+				sqlite3_bind_text(statement, 3, key, key_length, NULL) == SQLITE_OK &&
+				sqlite3_bind_text(statement, 4, expected, expected_length, NULL) == SQLITE_OK &&
+				sqlite3_step(statement) == SQLITE_DONE)
+			{
+				exchanged = sqlite3_changes(database->db) != 0 ? JS_TRUE : JS_FALSE;
+			}
+			JS_FreeCString(context, key);
+			sqlite3_finalize(statement);
+		}
+	}
+	return exchanged;
+}
+
 JSValue _database_remove(JSContext* context, JSValueConst this_val, int argc, JSValueConst* argv)
 {
 	database_t* database = JS_GetOpaque(this_val, _database_class_id);