PHP 클래스 Prado\Caching\TSqliteCache
TSqliteCache implements a cache application module based on SQLite database.
THIS CLASS IS DEPRECATED since it relies on the sqlite PHP extension, that is
no longer loaded by default since PHP 5.1. You are discouraged from using it:
use {@link TDbCache} instead.
Since PRADO v3.1.0, a new DB-based cache module called {@link TDbCache}
is provided. If you have PDO extension installed, you may consider using
the new cache module instead as it allows you to use different database
to store the cached data.
The database file is specified by the {@link setDbFile DbFile} property.
If not set, the database file will be created under the system state path.
If the specified database file does not exist, it will be created automatically.
Make sure the directory containing the specified DB file and the file itself is
writable by the Web server process.
The following basic cache operations are implemented:
- {@link get} : retrieve the value with a key (if any) from cache
- {@link set} : store the value with a key into cache
- {@link add} : store the value only if cache does not have this key
- {@link delete} : delete the value with the specified key from cache
- {@link flush} : delete all values from cache
Each value is associated with an expiration time. The {@link get} operation
ensures that any expired value will not be returned. The expiration time by
the number of seconds. A expiration time 0 represents never expire.
By definition, cache does not ensure the existence of a value
even if it never expires. Cache is not meant to be an persistent storage.
Do not use the same database file for multiple applications using TSqliteCache.
Also note, cache is shared by all user sessions of an application.
Some usage examples of TSqliteCache are as follows,
$cache=new TSqliteCache; // TSqliteCache may also be loaded as a Prado application module
$cache->setDbFile($dbFilePath);
$cache->init(null);
$cache->add('object',$object);
$object2=$cache->get('object');
If loaded, TSqliteCache will register itself with {@link TApplication} as the
cache module. It can be accessed via {@link TApplication::getCache()}.
TSqliteCache may be configured in application configuration file as follows
where {@link getDbFile DbFile} is a property specifying the location of the
SQLite DB file (in the namespace format).
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프로젝트 열기: pradosoft/prado
공개 메소드들
보호된 메소드들
| 메소드 |
설명 |
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addValue ( $key, $value, $expire ) : boolean |
Stores a value identified by a key into cache if the cache does not contain this key. |
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deleteValue ( $key ) : boolean |
Deletes a value with the specified key from cache
This is the implementation of the method declared in the parent class. |
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getValue ( $key ) : string |
Retrieves a value from cache with a specified key. |
|
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setValue ( $key, $value, $expire ) : boolean |
Stores a value identified by a key in cache. |
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메소드 상세
Disconnect the db connection.
This is the implementation of the method declared in the parent class.
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protected addValue ( $key, $value, $expire ) : boolean |
| 리턴 |
boolean |
true if the value is successfully stored into cache, false otherwise |
Deletes a value with the specified key from cache
This is the implementation of the method declared in the parent class.
Be careful of performing this operation if the cache is shared by multiple applications.
This is the implementation of the method declared in the parent class.
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protected getValue ( $key ) : string |
| 리턴 |
string |
the value stored in cache, false if the value is not in the cache or expired. |
This method is required by the IModule interface. It checks if the DbFile
property is set, and creates a SQLiteDatabase instance for it.
The database or the cache table does not exist, they will be created.
Expired values are also deleted.
This is the implementation of the method declared in the parent class.
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protected setValue ( $key, $value, $expire ) : boolean |
| 리턴 |
boolean |
true if the value is successfully stored into cache, false otherwise |