124 lines
4.7 KiB
PHP
124 lines
4.7 KiB
PHP
<?php
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/**
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* CTimestampBehavior class file.
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*
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* @author Jonah Turnquist <poppitypop@gmail.com>
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* @link http://www.yiiframework.com/
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* @copyright 2008-2013 Yii Software LLC
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* @license http://www.yiiframework.com/license/
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*/
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/**
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* CTimestampBehavior will automatically fill date and time related attributes.
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*
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* CTimestampBehavior will automatically fill date and time related attributes when the active record
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* is created and/or updated.
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* You may specify an active record model to use this behavior like so:
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* <pre>
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* public function behaviors(){
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* return array(
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* 'CTimestampBehavior' => array(
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* 'class' => 'zii.behaviors.CTimestampBehavior',
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* 'createAttribute' => 'create_time_attribute',
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* 'updateAttribute' => 'update_time_attribute',
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* )
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* );
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* }
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* </pre>
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* The {@link createAttribute} and {@link updateAttribute} options actually default to 'create_time' and 'update_time'
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* respectively, so it is not required that you configure them. If you do not wish CTimestampBehavior
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* to set a timestamp for record update or creation, set the corresponding attribute option to null.
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*
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* By default, the update attribute is only set on record update. If you also wish it to be set on record creation,
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* set the {@link setUpdateOnCreate} option to true.
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*
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* Although CTimestampBehavior attempts to figure out on it's own what value to inject into the timestamp attribute,
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* you may specify a custom value to use instead via {@link timestampExpression}
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*
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* @author Jonah Turnquist <poppitypop@gmail.com>
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* @package zii.behaviors
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* @since 1.1
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*/
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class CTimestampBehavior extends CActiveRecordBehavior {
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/**
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* @var mixed 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 mixed 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 bool Whether to set the update attribute to the creation timestamp upon creation.
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* Otherwise it will be left alone. Defaults to false.
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*/
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public $setUpdateOnCreate = false;
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/**
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* @var mixed 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 a {@link CDbExpression} object representing a DB expression (e.g. new CDbExpression('NOW()')).
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* Defaults to null, meaning that we will attempt to figure out the appropriate timestamp
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* automatically. If we fail at finding the appropriate timestamp, then it will
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* fall back to using the current UNIX timestamp.
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*
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* A PHP expression can be any PHP code that has a value. To learn more about what an expression is,
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* please refer to the {@link http://www.php.net/manual/en/language.expressions.php php manual}.
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*/
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public $timestampExpression;
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/**
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* @var array Maps column types to database method
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*/
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protected static $map = array(
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'datetime'=>'NOW()',
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'timestamp'=>'NOW()',
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'date'=>'NOW()',
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);
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/**
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* Responds to {@link CModel::onBeforeSave} event.
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* Sets the values of the creation or modified attributes as configured
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*
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* @param CModelEvent $event event parameter
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*/
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public function beforeSave($event) {
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if ($this->getOwner()->getIsNewRecord() && ($this->createAttribute !== null)) {
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$this->getOwner()->{$this->createAttribute} = $this->getTimestampByAttribute($this->createAttribute);
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}
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if ((!$this->getOwner()->getIsNewRecord() || $this->setUpdateOnCreate) && ($this->updateAttribute !== null)) {
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$this->getOwner()->{$this->updateAttribute} = $this->getTimestampByAttribute($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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*
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* @param string $attribute $attribute
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* @return mixed timestamp (eg unix timestamp or a mysql function)
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*/
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protected function getTimestampByAttribute($attribute) {
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if ($this->timestampExpression instanceof CDbExpression)
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return $this->timestampExpression;
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elseif ($this->timestampExpression !== null)
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return @eval('return '.$this->timestampExpression.';');
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$columnType = $this->getOwner()->getTableSchema()->getColumn($attribute)->dbType;
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return $this->getTimestampByColumnType($columnType);
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}
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/**
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* Returns the appropriate timestamp depending on $columnType
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*
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* @param string $columnType $columnType
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* @return mixed timestamp (eg unix timestamp or a mysql function)
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*/
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protected function getTimestampByColumnType($columnType) {
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return isset(self::$map[$columnType]) ? new CDbExpression(self::$map[$columnType]) : time();
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}
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}
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