<?php
class MyQuery
{
	var $action;
	var $fields;
	var $tables;
	var $conditions;
	var $orders;
	var $groups;
	var $updates;
	var $inserts;
	var $query;
	
	function MyQuery()
	{
		$this->initVars();
	}
	
	function initVars()
	{
		$this->action='';
		$this->fields = array();
		$this->tables = array();
		$this->conditions = array();
		$this->orders = array();
		$this->groups = array();
		$this->updates = array();
		$this->inserts = array();
		$this->query = '';
	}
	
	function setAction($action)
	{
		$this->action = $action;
	}
	
	function setField($field,$as='')
	{
		if ($as == '') {
			$this->fields[] = $field;
		} else {
			$this->fields[] = $field.' AS '.$as;
		}
	}
	
	function setTable($table,$as='')
	{
		if ($as == '') {
			$this->tables[] = $table;
		} else {
			$this->tables[] = $table.' AS '.$as;
		}
	}
	
	function setOrder($field,$order)
	{
		$this->orders[] = $field.' '.$order;
	}
	
	function setGroup($field)
	{
		$this->groups[] = $field;
	}
	
	function setCondition($condition)
	{
		$this->conditions[] = $condition;
	}
	
	function setUpdate($field,$value)
	{
		$this->updates[] = $field."='".$value."'";
	}
	
	function setInsert($field,$value)
	{
		$this->inserts[] = array($field,"'".$value."'");
	}
	
	function getGroups()
	{
		if (sizeof($this->groups)>0) {
			return 'GROUP BY '.join($this->groups, ', ').' ';
		} else {
			return '';
		}
	}
	
	function getFields()
	{
		if (sizeof($this->fields)>0) {
			return join($this->fields, ', ').' ';
		} else {
			return '* ';
		}
	}
	
	function getTables()
	{
		if (sizeof($this->tables>0)) {
			return join($this->tables,', ').' ';
		} else {
			return false;
		}
	}
	
	function getUpdates()
	{
		if (sizeof($this->updates)>0) {
			return 'SET '.join($this->updates,', ').' ';
		} else {
			return false;
		}
	}
	
	function getConditions()
	{
		if (sizeof($this->conditions)>0) {
			return 'WHERE '.join($this->conditions,' AND ').' ';
		} else {
			return '';
		}
	}
	
	function getOrders()
	{
		if (sizeof($this->orders)>0) {
			return 'ORDER BY '.join($this->orders,', ').' ';
		} else {
			return '';
		}
	}
	
	function getInserts()
	{
		$f = array();
		$v = array();
		foreach ($this->inserts as $ins) {
			list($field, $value) = $ins;
			$f[] = $field;
			$v[] = $value;
		}
		if (sizeof($f)==sizeof($v) && sizeof($f)>0) {
			return '('.join($f,', ').') VALUES ('.join($v,', ').') ';
		} else {
			return false;
		}
	}
	
	function getQuery()
	{
		switch (strtoupper($this->action)) {
			case 'SELECT': {
				$this->query = 'SELECT '.$this->getFields().'FROM '.$this->getTables().$this->getConditions().$this->getGroups().$this->getOrders();
				break;
			}
			case 'INSERT': {
				$this->query = 'INSERT INTO '. $this->getTables() . $this->getInserts();
				break;
			}
			case 'UPDATE': {
				$this->query = 'UPDATE '.$this->getTables() . $this->getUpdates() . $this->getConditions();
				break;
			}
			case 'DELETE': {
				$this->query = 'DELETE FROM '.$this->getTables() . $this->getConditions();
				break;
			}
			default: {
				return false;
			}
		}
		return $this->query;
	}
}
?>