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Adding note about the PdoSessionHandler BC break #12890

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Dec 8, 2014
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Adding note about the PdoSessionHandler BC break #12890

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Adding note about the PdoSessionHandler BC break
weaverryan Dec 8, 2014
adfdad9
Adding note about known BC issues
weaverryan Dec 8, 2014
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20 changes: 20 additions & 0 deletions UPGRADE-2.6.md
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Original file line number Diff line number Diff line change
@@ -1,6 +1,12 @@
UPGRADE FROM 2.5 to 2.6
=======================

Known Backwards-Compatability Breaks
------------------------------------

* If you use the `PdoSessionHandler`, the session table now has a different
schema and must be modified. Look below for more details.

Form
----

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--------------

* The `PdoSessionHandler` to store sessions in a database changed significantly.
This introduced a **backwards-compatability** break in the schema of the
session table. The following changes must be made to your session table:

- Add a new integer column called `sess_lifetime`. Assuming you have the
default column and table names, in MySQL this would be:
ALTER TABLE `session` ADD `sess_lifetime` INT NOT NULL ;
- Change the data column (default: `sess_value`) to be a Blob type. In
MySQL this would be:
ALTER TABLE `session` CHANGE `sess_value` `session_value` BLOB NOT NULL;

There is also an [issue](https://github.com/symfony/symfony/issues/12834)
that affects Windows servers.

The changes to the `PdoSessionHandler` are:
- By default, it now implements session locking to prevent loss of data by concurrent access to the same session.
- It does so using a transaction between opening and closing a session. For this reason, it's not
recommended to use the same database connection that you also use for your application logic.
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