发布于 2015-08-27 16:40:28 | 132 次阅读 | 评论: 0 | 来源: 网络整理
警告
There was a backwards-compatibility break in Symfony 2.6: the database schema changed slightly. See Symfony 2.6 Changes for details.
The default Symfony session storage 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.
Symfony 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):
# app/config/config.yml
framework:
session:
# ...
handler_id: session.handler.pdo
services:
session.handler.pdo:
class: SymfonyComponentHttpFoundationSessionStorageHandlerPdoSessionHandler
public: false
arguments:
- "mysql:dbname=mydatabase"
- { db_username: myuser, db_password: mypassword }
<!-- app/config/config.xml -->
<framework:config>
<framework:session handler-id="session.handler.pdo" cookie-lifetime="3600" auto-start="true"/>
</framework:config>
<services>
<service id="session.handler.pdo" class="SymfonyComponentHttpFoundationSessionStorageHandlerPdoSessionHandler" public="false">
<argument>mysql:dbname=mydatabase</agruement>
<argument type="collection">
<argument key="db_username">myuser</argument>
<argument key="db_password">mypassword</argument>
</argument>
</service>
</services>
// app/config/config.php
use SymfonyComponentDependencyInjectionDefinition;
use SymfonyComponentDependencyInjectionReference;
$container->loadFromExtension('framework', array(
...,
'session' => array(
// ...,
'handler_id' => 'session.handler.pdo',
),
));
$storageDefinition = new Definition('SymfonyComponentHttpFoundationSessionStorageHandlerPdoSessionHandler', array(
'mysql:dbname=mydatabase',
array('db_username' => 'myuser', 'db_password' => 'mypassword')
));
$container->setDefinition('session.handler.pdo', $storageDefinition);
This will expect a sessions table with a number of different columns.
The table name, and all of the column names, can be configured by passing
a second array argument to PdoSessionHandler:
# app/config/config.yml
services:
# ...
session.handler.pdo:
class: SymfonyComponentHttpFoundationSessionStorageHandlerPdoSessionHandler
public: false
arguments:
- "mysql:dbname=mydatabase"
- { db_table: sessions, db_username: myuser, db_password: mypassword }
<!-- app/config/config.xml -->
<services>
<service id="session.handler.pdo" class="SymfonyComponentHttpFoundationSessionStorageHandlerPdoSessionHandler" public="false">
<argument>mysql:dbname=mydatabase</agruement>
<argument type="collection">
<argument key="db_table">sessions</argument>
<argument key="db_username">myuser</argument>
<argument key="db_password">mypassword</argument>
</argument>
</service>
</services>
// app/config/config.php
use SymfonyComponentDependencyInjectionDefinition;
// ...
$storageDefinition = new Definition('SymfonyComponentHttpFoundationSessionStorageHandlerPdoSessionHandler', array(
'mysql:dbname=mydatabase',
array('db_table' => 'sessions', 'db_username' => 'myuser', 'db_password' => 'mypassword')
));
$container->setDefinition('session.handler.pdo', $storageDefinition);
2.6 新版功能: The db_lifetime_col was introduced in Symfony 2.6. Prior to 2.6,
this column did not exist.
The following things can be configured:
db_table: (default sessions) The name of the session table in your
database;db_id_col: (default sess_id) The name of the id column in your
session table (VARCHAR(128));db_data_col: (default sess_data) The name of the value column in
your session table (BLOB);db_time_col: (default sess_time) The name of the time column in
your session table (INTEGER);db_lifetime_col: (default sess_lifetime) The name of the lifetime
column in your session table (INTEGER).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
parameters.yml file by referencing the database-related parameters defined there:
services:
session.handler.pdo:
class: SymfonyComponentHttpFoundationSessionStorageHandlerPdoSessionHandler
public: false
arguments:
- "mysql:host=%database_host%;port=%database_port%;dbname=%database_name%"
- { db_username: %database_user%, db_password: %database_password% }
<service id="session.handler.pdo" class="SymfonyComponentHttpFoundationSessionStorageHandlerPdoSessionHandler" public="false">
<argument>mysql:host=%database_host%;port=%database_port%;dbname=%database_name%</agruement>
<argument type="collection">
<argument key="db_username">%database_user%</argument>
<argument key="db_password">%database_password%</argument>
</argument>
</service>
$storageDefinition = new Definition('SymfonyComponentHttpFoundationSessionStorageHandlerPdoSessionHandler', array(
'mysql:host=%database_host%;port=%database_port%;dbname=%database_name%',
array('db_username' => '%database_user%', 'db_password' => '%database_password%')
));
The SQL statement for creating the needed database table might look like the following (MySQL):
CREATE TABLE `sessions` (
`sess_id` VARBINARY(128) NOT NULL PRIMARY KEY,
`sess_data` BLOB NOT NULL,
`sess_time` INTEGER UNSIGNED NOT NULL,
`sess_lifetime` MEDIUMINT NOT NULL
) COLLATE utf8_bin, ENGINE = InnoDB;
注解
A BLOB column type can only store up to 64 kb. If the data stored in
a user’s session exceeds this, an exception may be thrown or their session
will be silently reset. Consider using a MEDIUMBLOB if you need more
space.
For PostgreSQL, the statement should look like this:
CREATE TABLE sessions (
sess_id VARCHAR(128) NOT NULL PRIMARY KEY,
sess_data BYTEA NOT NULL,
sess_time INTEGER NOT NULL,
sess_lifetime INTEGER NOT NULL
);
For MSSQL, the statement might look like the following:
CREATE TABLE [dbo].[sessions](
[sess_id] [nvarchar](255) NOT NULL,
[sess_data] [ntext] NOT NULL,
[sess_time] [int] NOT NULL,
[sess_lifetime] [int] NOT NULL,
PRIMARY KEY CLUSTERED(
[sess_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]