Yii Framework-Data caching

Yii Framework-Data caching

1. Configuration of Yii cache:

Yii directory/config/web.php file, configure the value of class array under the cache array, default to Yii\caching\filecache.

2. Use of the cache:
To get the cache component:

$cache=\yii::$app->cache;

To add cached data:

$cach->add (key, value[,time][,dependency]);

Parameters:	Key	Key
	Value	Value
	Time	Optional, cache expiration
	Dependency	Optional, dependency mode
return value:

To modify the cached data:

$cach->set (key, value[,time]);

Parameters:	Key	Key
	Value	Value
	Time	Optional, cache expiration
return value:

Note: If multiple modifications are made to the same key at the same time, only the first modification is valid.

To delete cached data:

$cach->delete (key);

Parameters:	Key	Key
return value:

Get Cached data:

$cach->get (key);

Parameters:	Key	Key
return value:

Empty the cache:

$cach,flush();

return value:

3. Cache dependency:

There are three ways to rely on caching: file dependencies, expression dependencies, db dependencies, chain dependencies, group dependencies. Only the first three dependencies are described here.

File dependencies:

// declaring dependent methods and dependent files $dependency=new  \yii\caching\filedependency ([' filename ' = ' test.txt ']); // associated caches and dependencies $cache->add (' key1 ', ' Hello world! ',$dependency);

If the file changes, the associated cache is invalidated.

Expression dependency:

// declaring dependency patterns and dependency expressions $dependency=new  \yii\caching\expressiondependency ([' expression ' = ' = ' \yii\:: $app- >requests->get ("name") ']); // associating a cache with a dependency $cache->add (' key1 ', ' Hello world! ',$dependency);

If the expression result changes, the associated cache is invalidated.

DB dependency:

// declaring dependency patterns and relying on SQL statements $dependency=new  \yii\caching\dbdependency ([' sql ' = ' = ' SELECT coun (*) from Yii ']); // associated caches and dependencies $cache->add (' key1 ', ' Hello world! ',$dependency);

If the result of the SQL statement execution changes, the associated cache is invalidated.

Yii Framework-Data caching