pdo_mysql error suddenly appears on drupal based website?

Question

My drupal based website was working fine till yesterday but suddenly from no where today an error appeared

Fatal error: Undefined class constant 'MYSQL_ATTR_USE_BUFFERED_QUERY' in /.../includes/database/mysql/database.inc on line 43

I didn't even changed or updated anything since yesterday, it suddenly appears from no where, before that it was working fine

On line 43 of database.inc this was written

 PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE,

I googled and got some idea that this is some sort of PDO_MYSQL error, i have not much idea why this error suddenly arrived

Can anyone please help me out

Additional information

• Linux Shared Webhosting
• DRUPAL 7
• Apache version 2.2.20
• PHP version 5.2.17
• MySQL version 5.0.92-community-log
• cPanel Version 11.30.3 (build 5)

Answer 1

According to a lot of different sources the pdo_mysql extension must be missing from your PHP installation. Either add it in php.ini or ask your hosting provider to do it for you.

Links:

• Fatal error in D7 HEAD while running 'drush update'
• Drupal 7: PHP fatal error 'Undefined class constant MYSQL_ATTR_USE_BUFFERED_QUERY' when trying to install on MySQL database
• Fatal Error: Undefined class constant 'MYSQL_ATTR_USE_BUFFERED_QUERY'

They all say the same thing...install the pdo_mysql extension. Sounds like your hosting provider has disabled it!