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<?php
/**
* TMysqlMetaDataInspector class file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2007 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Data.ActiveRecord.Vendor
*/
Prado::using('System.Data.ActiveRecord.Vendor.TDbMetaDataInspector');
Prado::using('System.Data.ActiveRecord.Vendor.TMysqlColumnMetaData');
Prado::using('System.Data.ActiveRecord.Vendor.TMysqlMetaData');
/**
* TMysqlMetaDataInspector class.
*
* Gathers table column properties for Mysql database.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @version $Id$
* @package System.Data.ActiveRecord.Vendor
* @since 3.1
*/
class TMysqlMetaDataInspector extends TDbMetaDataInspector
{
/**
* Get the column definitions for given table.
* @param string table name.
* @return array column name value pairs of column meta data.
*/
protected function getColumnDefinitions($table)
{
$sql="SHOW FULL FIELDS FROM {$table}";
$conn = $this->getDbConnection();
$conn->setActive(true);
$command = $conn->createCommand($sql);
$command->prepare();
foreach($command->query() as $col)
$cols[strtolower($col['Field'])] = $this->getColumnMetaData($col);
return $cols;
}
protected function getColumnMetaData($col)
{
$name = '`'.$col['Field'].'`'; //quote the column names!
$type = $col['Type'];
$notNull = $col['Null']==='NO';
$autoIncrement=is_int(strpos(strtolower($col['Extra']), 'auto_increment'));
$default = $col['Default'];
$primaryKey = $col['Key']==='PRI';
return new TMysqlColumnMetaData(strtolower($col['Field']),$name,$type,
$notNull,$autoIncrement,$default,$primaryKey);
}
/**
* Not implemented, Mysql does not always have foreign key constraints.
*/
protected function getConstraintKeys($table)
{
return array('primary'=>array(), 'foreign'=>array());
}
/**
* Create a new instance of meta data.
* @param string table name
* @param array column meta data
* @param array primary key meta data
* @param array foreign key meta data.
* @return TDbMetaData table meta data.
*/
protected function createMetaData($table, $columns, $primary, $foreign)
{
$pks = array();
foreach($columns as $name=>$column)
if($column->getIsPrimaryKey())
$pks[] = $name;
return new TMysqlMetaData($table,$columns,$pks);
}
}
?>
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