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Showing content from https://www.yiiframework.com/doc/api/2.0/yii-caching-dbdependency below:

DbDependency, yii\caching\DbDependency | API Documentation for Yii 2.0

Class yii\caching\DbDependency

DbDependency represents a dependency based on the query result of a SQL statement.

If the query result changes, the dependency is considered as changed. The query is specified via the $sql property.

For more details and usage information on Cache, see the guide article on caching.

Property Details

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The application component ID of the DB connection.

The parameters (name => value) to be bound to the SQL statement specified by $sql.

The SQL query whose result is used to determine if the dependency has been changed. Only the first row of the query result will be used.

Method Details

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Defined in: yii\base\BaseObject::__call()

Calls the named method which is not a class method.

Do not call this method directly as it is a PHP magic method that will be implicitly called when an unknown method is being invoked.

Source code

                public function __call($name, $params)
{
    throw new UnknownMethodException('Calling unknown method: ' . get_class($this) . "::$name()");
}

Defined in: yii\base\BaseObject::__construct()

Constructor.

The default implementation does two things:

Initializes the object with the given configuration $config.
Call init().

If this method is overridden in a child class, it is recommended that

the last parameter of the constructor is a configuration array, like $config here.
call the parent implementation at the end of the constructor.

public void __construct ( $config = [] ) $config array

Name-value pairs that will be used to initialize the object properties

Source code

                public function __construct($config = [])
{
    if (!empty($config)) {
        Yii::configure($this, $config);
    }
    $this->init();
}

Defined in: yii\base\BaseObject::__get()

Returns the value of an object property.

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing $value = $object->property;.

See also canGetProperty().

public boolean canSetProperty ( $name, $checkVars = true ) $name string

The property name

$checkVars boolean

Whether to treat member variables as properties

return boolean

Whether the property can be written

Source code

                public function canSetProperty($name, $checkVars = true)
{
    return method_exists($this, 'set' . $name) || $checkVars && property_exists($this, $name);
}

Deprecated since 2.0.14. On PHP >=5.5, use ::class instead.

Source code

                public static function className()
{
    return get_called_class();
}

Source code

                public function evaluateDependency($cache)
{
    if ($this->reusable) {
        $hash = $this->generateReusableHash();
        if (!array_key_exists($hash, self::$_reusableData)) {
            self::$_reusableData[$hash] = $this->generateDependencyData($cache);
        }
        $this->data = self::$_reusableData[$hash];
    } else {
        $this->data = $this->generateDependencyData($cache);
    }
}

Generates the data needed to determine if dependency has been changed.

This method returns the value of the global state.

Source code

                protected function generateDependencyData($cache)
{
    
    $db = Instance::ensure($this->db, Connection::className());
    if ($this->sql === null) {
        throw new InvalidConfigException('DbDependency::sql must be set.');
    }
    if ($db->enableQueryCache) {
        
        $db->enableQueryCache = false;
        $result = $db->createCommand($this->sql, $this->params)->queryOne();
        $db->enableQueryCache = true;
    } else {
        $result = $db->createCommand($this->sql, $this->params)->queryOne();
    }
    return $result;
}

Source code

                protected function generateReusableHash()
{
    $clone = clone $this;
    $clone->data = null; 
    try {
        $serialized = serialize($clone);
    } catch (\Exception $e) {
        
        foreach ($clone as $name => $value) {
            if (is_object($value) && $value instanceof \Closure) {
                $clone->{$name} = null;
            }
        }
        $serialized = serialize($clone);
    }
    return sha1($serialized);
}

Deprecated since version 2.0.11. Will be removed in version 2.1. Use isChanged() instead.

Source code

                public function getHasChanged($cache)
{
    return $this->isChanged($cache);
}

Defined in: yii\base\BaseObject::hasMethod()

Returns a value indicating whether a method is defined.

The default implementation is a call to php function method_exists(). You may override this method when you implemented the php magic method __call().

Source code

                public function hasMethod($name)
{
    return method_exists($this, $name);
}

Defined in: yii\base\BaseObject::hasProperty()

Returns a value indicating whether a property is defined.

A property is defined if:

the class has a getter or setter method associated with the specified name (in this case, property name is case-insensitive);
the class has a member variable with the specified name (when $checkVars is true);