How to use PdoSessionHandler to store Sessions in the Database
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How to use PdoSessionHandler to store Sessions in the Database
The default session storage of Symfony2 writes the session information to file(s). Most medium to large websites use a database to store the session values instead of files, because databases are easier to use and scale in a multi-webserver environment.
Symfony2 has a built-in solution for database session storage called
PdoSessionHandler.
To use it, you just need to change some parameters in config.yml (or the
configuration format of your choice):
2.1
In Symfony2.1 the class and namespace are slightly modified. You can now
find the session storage classes in the `Session\Storage` namespace:
Symfony. Also
note that in Symfony2.1 you should configure handler_id not storage_id like in Symfony2.0.
Below, you'll notice that %session.storage.options% is not used anymore.
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# app/config/config.yml
framework:
session:
# ...
handler_id: session.handler.pdo
parameters:
pdo.db_options:
db_table: session
db_id_col: session_id
db_data_col: session_value
db_time_col: session_time
services:
pdo:
class: PDO
arguments:
dsn: "mysql:dbname=mydatabase"
user: myuser
password: mypassword
session.handler.pdo:
class: Symfony\Component\HttpFoundation\Session\Storage\Handler\PdoSessionHandler
arguments: ["@pdo", "%pdo.db_options%"]db_table: The name of the session table in your databasedb_id_col: The name of the id column in your session table (VARCHAR(255) or larger)db_data_col: The name of the value column in your session table (TEXT or CLOB)db_time_col: The name of the time column in your session table (INTEGER)
Sharing your Database Connection Information
With the given configuration, the database connection settings are defined for the session storage connection only. This is OK when you use a separate database for the session data.
But if you'd like to store the session data in the same database as the rest of your project's data, you can use the connection settings from the parameter.ini by referencing the database-related parameters defined there:
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pdo:
class: PDO
arguments:
- "mysql:host=%database_host%;port=%database_port%;dbname=%database_name%"
- "%database_user%"
- "%database_password%"Example SQL Statements
MySQL
The SQL statement for creating the needed database table might look like the following (MySQL):
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CREATE TABLE `session` (
`session_id` varchar(255) NOT NULL,
`session_value` text NOT NULL,
`session_time` int(11) NOT NULL,
PRIMARY KEY (`session_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;PostgreSQL
For PostgreSQL, the statement should look like this:
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CREATE TABLE session (
session_id character varying(255) NOT NULL,
session_value text NOT NULL,
session_time integer NOT NULL,
CONSTRAINT session_pkey PRIMARY KEY (session_id)
);Microsoft SQL Server
For MSSQL, the statement might look like the following:
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CREATE TABLE [dbo].[session]([session_id] [nvarchar](255) NOT NULL, [session_value] [ntext] NOT NULL, [session_time] [int] NOT NULL, PRIMARY KEY CLUSTERED( [session_id] ASC ) WITH ( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON ) ON [PRIMARY] ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
