AJAX HTTP error

Many Drupal users had encountered the following error in a modal window when using Panels after clicking on the settings cog to add content to a panel layout. "An AJAX HTTP error occurred. HTTP Result Code: 200 Debugging information follows." If you are facing the same perplexing error message in your Drupal then read on to find out the fix.

Sometimes we may require updating several rows of data with different queries and make sure every query execute correctly to keep the database consistency. Here is a simple solution to enable such transactions with Mysql and Python. To do this, we can start a transaction and commit the changes to the table. The data will be written to the table only after the commit statement is executed. If there is an error in between, we can rollback, so that all the inconsistencies are cleared.