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<?php
/**
* TDbTableColumn class file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2010 PradoSoft
* @license http://www.pradosoft.com/license/
* @version $Id$
* @package System.Data.Common
*/
/**
* TDbTableColumn class describes the column meta data of the schema for a database table.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @version $Id$
* @package System.Data.Common
* @since 3.1
*/
class TDbTableColumn extends TComponent
{
const UNDEFINED_VALUE= INF; //use infinity for undefined value
private $_info=array();
/**
* Sets the table column meta data.
* @param array table column information.
*/
public function __construct($columnInfo)
{
$this->_info=$columnInfo;
}
/**
* @param string information array key name
* @param mixed default value if information array value is null
* @return mixed information array value.
*/
protected function getInfo($name,$default=null)
{
return isset($this->_info[$name]) ? $this->_info[$name] : $default;
}
/**
* @param string information array key name
* @param mixed new information array value.
*/
protected function setInfo($name,$value)
{
$this->_info[$name]=$value;
}
/**
* Returns the derived PHP primitive type from the db type. Default returns 'string'.
* @return string derived PHP primitive type from the column db type.
*/
public function getPHPType()
{
return 'string';
}
/**
* @param integer PDO bind param/value types, default returns string.
*/
public function getPdoType()
{
switch($this->getPHPType())
{
case 'boolean': return PDO::PARAM_BOOL;
case 'integer': return PDO::PARAM_INT;
case 'string' : return PDO::PARAM_STR;
}
return PDO::PARAM_STR;
}
/**
* @return string name of the column in the table (identifier quoted).
*/
public function getColumnName()
{
return $this->getInfo('ColumnName');
}
/**
* @return string name of the column with quoted identifier.
*/
public function getColumnId()
{
return $this->getInfo('ColumnId');
}
/**
* @return string size of the column.
*/
public function getColumnSize()
{
return $this->getInfo('ColumnSize');
}
/**
* @return integer zero-based ordinal position of the column in the table.
*/
public function getColumnIndex()
{
return $this->getInfo('ColumnIndex');
}
/**
* @return string column type.
*/
public function getDbType()
{
return $this->getInfo('DbType');
}
/**
* @return boolean specifies whether value Null is allowed, default is false.
*/
public function getAllowNull()
{
return $this->getInfo('AllowNull',false);
}
/**
* @return mixed default column value if column value was null.
*/
public function getDefaultValue()
{
return $this->getInfo('DefaultValue', self::UNDEFINED_VALUE);
}
/**
* @return string precision of the column data, if the data is numeric.
*/
public function getNumericPrecision()
{
return $this->getInfo('NumericPrecision');
}
/**
* @return string scale of the column data, if the data is numeric.
*/
public function getNumericScale()
{
return $this->getInfo('NumericScale');
}
public function getMaxiumNumericConstraint()
{
if(($precision=$this->getNumericPrecision())!==null)
{
$scale=$this->getNumericScale();
return $scale===null ? pow(10,$precision) : pow(10,$precision-$scale);
}
}
/**
* @return boolean whether this column is a primary key for the table, default is false.
*/
public function getIsPrimaryKey()
{
return $this->getInfo('IsPrimaryKey',false);
}
/**
* @return boolean whether this column is a foreign key, default is false.
*/
public function getIsForeignKey()
{
return $this->getInfo('IsForeignKey',false);
}
/**
* @param string sequence name, only applicable if column is a sequence
*/
public function getSequenceName()
{
return $this->getInfo('SequenceName');
}
/**
* @return boolean whether the column is a sequence.
*/
public function hasSequence()
{
return $this->getSequenceName()!==null;
}
/**
* @return boolean whether this column is excluded from insert and update.
*/
public function getIsExcluded()
{
return false;
}
}
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