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<?php
/**
* CMysqlColumnSchema class file.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @link http://www.yiiframework.com/
* @copyright 2008-2013 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CMysqlColumnSchema class describes the column meta data of a MySQL table.
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @package system.db.schema.mysql
* @since 1.0
*/
class CMysqlColumnSchema extends CDbColumnSchema
{
/**
* Extracts the PHP type from DB type.
* @param string $dbType DB type
*/
protected function extractType($dbType)
{
if(strncmp($dbType,'enum',4)===0)
$this->type='string';
elseif(strpos($dbType,'float')!==false || strpos($dbType,'double')!==false)
$this->type='double';
elseif(strpos($dbType,'bool')!==false)
$this->type='boolean';
elseif(strpos($dbType,'int')===0 && strpos($dbType,'unsigned')===false || preg_match('/(bit|tinyint|smallint|mediumint)/',$dbType))
$this->type='integer';
else
$this->type='string';
}
/**
* Extracts the default value for the column.
* The value is typecasted to correct PHP type.
* @param mixed $defaultValue the default value obtained from metadata
*/
protected function extractDefault($defaultValue)
{
if(strncmp($this->dbType,'bit',3)===0)
$this->defaultValue=bindec(trim($defaultValue,'b\''));
elseif(($this->dbType==='timestamp' || $this->dbType==='datetime') && ($defaultValue==='CURRENT_TIMESTAMP' || $defaultValue==='current_timestamp()'))
$this->defaultValue=null;
else
parent::extractDefault($defaultValue);
}
/**
* Extracts size, precision and scale information from column's DB type.
* @param string $dbType the column's DB type
*/
protected function extractLimit($dbType)
{
if (strncmp($dbType, 'enum', 4)===0 && preg_match('/\(([\'"])(.*)\\1\)/',$dbType,$matches))
{
// explode by (single or double) quote and comma (ENUM values may contain commas)
$values = explode($matches[1].','.$matches[1], $matches[2]);
$size = 0;
foreach($values as $value)
{
if(($n=strlen($value)) > $size)
$size=$n;
}
$this->size = $this->precision = $size;
}
else
parent::extractLimit($dbType);
}
}
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