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106 lines
3.1 KiB
106 lines
3.1 KiB
13 years ago
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<?php
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/**
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* @link http://www.yiiframework.com/
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* @copyright Copyright (c) 2008 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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namespace yii\behaviors;
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use yii\base\Behavior;
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use yii\db\Expression;
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use yii\db\ActiveRecord;
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/**
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* AutoTimestamp will automatically fill the attributes about creation time and updating time.
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*
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* AutoTimestamp fills the attributes when the associated AR model is being inserted or updated.
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* You may specify an AR to use this behavior like the following:
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*
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* ~~~
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* public function behaviors()
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* {
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* return array(
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* 'timestamp' => array(
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* 'class' => 'yii\behaviors\AutoTimestamp',
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* ),
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* );
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* }
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* ~~~
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*
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* By default, the attribute for keeping the creation time is named as "create_time", and the attribute
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* for updating time is "update_time". You may customize the names via [[createAttribute]] and [[updateAttribute]].
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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* @since 2.0
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*/
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class AutoTimestamp extends Behavior
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{
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/**
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* @var string The name of the attribute to store the creation time. Set to null to not
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* use a timestamp for the creation attribute. Defaults to 'create_time'
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*/
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public $createAttribute = 'create_time';
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/**
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* @var string The name of the attribute to store the modification time. Set to null to not
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* use a timestamp for the update attribute. Defaults to 'update_time'
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*/
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public $updateAttribute = 'update_time';
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/**
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* @var string|Expression The expression that will be used for generating the timestamp.
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* This can be either a string representing a PHP expression (e.g. 'time()'),
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* or an [[Expression]] object representing a DB expression (e.g. `new Expression('NOW()')`).
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* If not set, it will use the value of `time()` to fill the attributes.
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*/
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public $timestamp;
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/**
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* Declares event handlers for the [[owner]]'s events.
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* @return array events (array keys) and the corresponding event handler methods (array values).
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*/
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public function events()
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{
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return array(
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ActiveRecord::EVENT_BEFORE_INSERT => 'beforeInsert',
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ActiveRecord::EVENT_BEFORE_UPDATE => 'beforeInsert',
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);
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}
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/**
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* This is the event handler for the "beforeInsert" event of the associated AR object.
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*/
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public function beforeInsert()
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{
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if ($this->createAttribute !== null) {
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$this->owner->{$this->createAttribute} = $this->evaluateTimestamp($this->createAttribute);
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}
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}
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/**
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* This is the event handler for the "beforeUpdate" event of the associated AR object.
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*/
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public function beforeUpdate()
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{
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if ($this->updateAttribute !== null) {
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$this->owner->{$this->updateAttribute} = $this->evaluateTimestamp($this->updateAttribute);
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}
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}
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/**
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* Gets the appropriate timestamp depending on the column type $attribute is
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* @param string $attribute attribute name
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* @return mixed the timestamp value
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*/
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protected function evaluateTimestamp($attribute)
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{
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if ($this->timestamp instanceof Expression) {
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return $this->timestamp;
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} elseif ($this->timestamp !== null) {
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return eval('return ' . $this->timestamp . ';');
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} else {
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return time();
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}
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}
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}
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