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<?php
/**
* TPgsqlCommandBuilder class file.
*
* @author Wei Zhuo <weizhuo[at]gmail[dot]com>
* @link http://www.pradosoft.com/
* @copyright Copyright © 2005-2014 PradoSoft
* @license http://www.pradosoft.com/license/
* @package Prado\Data\Common\Pgsql
*/
namespace Prado\Data\Common\Pgsql;
use Prado\Data\Common\TDbCommandBuilder;
use Prado\Prado;
Prado::using('System.Data.Common.TDbCommandBuilder');
/**
* TPgsqlCommandBuilder provides specifics methods to create limit/offset query commands
* for Pgsql database.
*
* @author Wei Zhuo <weizho[at]gmail[dot]com>
* @package Prado\Data\Common\Pgsql
* @since 3.1
*/
class TPgsqlCommandBuilder extends TDbCommandBuilder
{
/**
* Overrides parent implementation. Only column of type text or character (and its variants)
* accepts the LIKE criteria.
* @param array list of column id for potential search condition.
* @param string string of keywords
* @return string SQL search condition matching on a set of columns.
*/
public function getSearchExpression($fields, $keywords)
{
$columns = array();
foreach($fields as $field)
{
if($this->isSearchableColumn($this->getTableInfo()->getColumn($field)))
$columns[] = $field;
}
return parent::getSearchExpression($columns, $keywords);
}
/**
*
* @return boolean true if column can be used for LIKE searching.
*/
protected function isSearchableColumn($column)
{
$type = strtolower($column->getDbType());
return $type === 'character varying' || $type === 'varchar' ||
$type === 'character' || $type === 'char' || $type === 'text';
}
/**
* Overrides parent implementation to use PostgreSQL's ILIKE instead of LIKE (case-sensitive).
* @param string column name.
* @param array keywords
* @return string search condition for all words in one column.
*/
protected function getSearchCondition($column, $words)
{
$conditions=array();
foreach($words as $word)
$conditions[] = $column.' ILIKE '.$this->getDbConnection()->quoteString('%'.$word.'%');
return '('.implode(' AND ', $conditions).')';
}
}
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