<?php
/**
 * File containing the ezcQueryExpressionPgsql class.
 *
 * @package Database
 * @version 1.1rc1
 * @copyright Copyright (C) 2005, 2006 eZ systems as. All rights reserved.
 * @license http://ez.no/licenses/new_bsd New BSD License
 */

/**
 * The ezcQueryExpressionPgsql class is used to create SQL expression for PostgreSQL.
 *
 * This class reimplements the methods that have a different syntax in postgreSQL.
 *
 * @package Database
 */
class ezcQueryExpressionOracle extends ezcQueryExpression
{
    /**
     * Constructs an empty ezcQueryExpression
     */
    public function __construct()
    {
        parent::__construct();
    }

    /**
     * Returns a series of strings concatinated
     *
     * concat() accepts an arbitrary number of parameters. Each parameter
     * must contain an expression or an array with expressions.
     *
     * @throws ezcQueryVariableException if no parameters are provided
     * @param string|array(string) strings that will be concatinated.
     * @return string
     */
    public function concat()
    {
        $args = func_get_args();
        $cols = self::arrayFlatten( $args );
        if ( count( $cols ) < 1 )
        {
            throw new ezcQueryVariableParameterException( 'concat', count( $args ), 1 );
        }

        $cols = $this->getIdentifiers( $cols );
        return join( ' || ' , $cols );
    }
}
?>