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70 lines
1.3 KiB
PHP
70 lines
1.3 KiB
PHP
<?php
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/* Copyright (C) NAVER <http://www.navercorp.com> */
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/**
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* SelectExpression
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* Represents an expresion that appears in the select clause
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*
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* $column_name can be:
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* - a table column name
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* - an sql function - like count(*)
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* - an sql expression - substr(column_name, 1, 8) or score1 + score2
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* $column_name is already escaped
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*
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* @author Arnia Software
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* @package /classes/db/queryparts/expression
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* @version 0.1
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*/
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class SelectExpression extends Expression
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{
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/**
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* column alias name
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* @var string
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*/
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var $column_alias;
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/**
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* constructor
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* @param string $column_name
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* @param string $alias
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* @return void
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*/
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function __construct($column_name, $alias = NULL)
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{
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parent::__construct($column_name);
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$this->column_alias = $alias;
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}
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/**
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* Return column expression, ex) column as alias
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* @return string
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*/
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function getExpression()
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{
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return sprintf("%s%s", $this->column_name, $this->column_alias ? (' AS ' . $this->column_alias) : "");
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}
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function show()
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{
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return true;
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}
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function getArgument()
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{
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return null;
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}
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function getArguments()
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{
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return array();
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}
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function isSubquery()
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{
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return false;
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}
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}
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/* End of file SelectExpression.class.php */
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/* Location: ./classes/db/queryparts/expression/SelectExpression.class.php */
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