Bug #71176 [NEW]: Updating records within a limit/offset loop misses records

From: espadav8 at gmail dot com Operating system: OS X and Linux PHP version: 7.0.1 Package: PDO PgSQL Bug Type: Bug Bug description:Updating records within a limit/offset loop misses records Description: ------------ When looping over all records in the database using 'limit X offset Y' to update a column, the postgres PDO driver will start to return the same records again for different offset values. It gets worse the smaller the limit size compared to the dataset size. Test script: --------------- https://github.com/EspadaV8/laravel-chunking-non-persistance/blob/develop/public/pg-pdo-test.php Script assumes that there is a database with a table called example with columns id (serial), name (text) and name-new (text). Expected result: ---------------- ID: 72 - Name: 5677360fde707 - Name new: 5677360fde707-qwe ID: 69 - Name: 5677360fdde80 - Name new: 5677360fdde80-qwe ID: 70 - Name: 5677360fde241 - Name new: 5677360fde241-qwe ID: 71 - Name: 5677360fde4c3 - Name new: 5677360fde4c3-qwe Actual result: -------------- Depending on the limit to dataset size (limit 1, 4 records) ID: 62 - Name: 567735dbccacd - Name new: 567735dbccacd ID: 64 - Name: 567735dbccffc - Name new: 567735dbccffc ID: 63 - Name: 567735dbccd4c - Name new: 567735dbccd4c-qwe ID: 61 - Name: 567735dbcc64b - Name new: 567735dbcc64b-qwe-qwe-qwe or (limit 3, 4 records) ID: 72 - Name: 5677360fde707 - Name new: 5677360fde707 ID: 69 - Name: 5677360fdde80 - Name new: 5677360fdde80-qwe ID: 70 - Name: 5677360fde241 - Name new: 5677360fde241-qwe ID: 71 - Name: 5677360fde4c3 - Name new: 5677360fde4c3-qwe-qwe -- Edit bug report at https://bugs.php.net/bug.php?id=71176&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=71176&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=71176&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=71176&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=71176&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=71176&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=71176&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=71176&r=needscript Try newer version: https://bugs.php.net/fix.php?id=71176&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=71176&r=support Expected behavior: https://bugs.php.net/fix.php?id=71176&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=71176&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=71176&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=71176&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=71176&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=71176&r=dst IIS Stability: https://bugs.php.net/fix.php?id=71176&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=71176&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=71176&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=71176&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=71176&r=mysqlcfg