SELECT ... FOR UPDATE causes LIMIT syntax error

[cjhewett]

Describe the bug

InnoDB supports the syntax SELECT ... FOR UPDATE to allow row level locking. When run in PMA this statement causes an SQL error as the LIMIT clause appears to be injected into the wrong place within it.

To Reproduce

Steps to reproduce the behavior:

1. Go to for 5.1 demo server https://www.phpmyadmin.net/try/ and use MariaDB
2. Run SELECT * FROM information_schema.CHARACTER_SETS FOR UPDATE;
3. See error

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'LIMIT 0, 25' at line 1

Expected behavior

The statement should run correctly.

Screenshots

Server configuration

• Database version: 10.4.8-MariaDB-1:10.4.8+maria~stretch-log - mariadb.org binary distribution
• PHP version: 7.4.25
• phpMyAdmin version: 5.1.2-dev

Additional context

If the LIMIT clause is manually entered, it does run with no error SELECT * FROM information_schema.CHARACTER_SETS LIMIT 1 FOR UPDATE;

There are other combinations, like FOR SHARE and SKIP LOCKED which probably exhibit the same issues.

[williamdes]

Hi @ChrisHSandN

Thank you for reporting this issue, I tagged it for the parser as I am not sure if this issue is in our parser library or not