Added rollback-related comment to nextSequenceValue()

diff --git a/includes/db/Database.php b/includes/db/Database.php
index 02839c3..4b54b8e 100644 (file)
--- a/includes/db/Database.php
+++ b/includes/db/Database.php
@@ -2258,6 +2258,10 @@ abstract class DatabaseBase implements DatabaseType {
         * Returns an appropriately quoted sequence value for inserting a new row.
         * MySQL has autoincrement fields, so this is just NULL. But the PostgreSQL
         * subclass will return an integer, and save the value for insertId()
+        *
+        * Any implementation of this function should *not* involve reusing
+        * sequence numbers created for rolled-back transactions.
+        * See http://bugs.mysql.com/bug.php?id=30767 for details.
         */
        function nextSequenceValue( $seqName ) {
                return null;