<?php
class Metadata
{
	private $db;				//传入PDO对象.
	
	//使用到的公共变量
	public $tbl_metadata = "en.normalmetadata";
	
	function __construct($db)
	{
		$this->db = $db;
	}
	
	function view($uuid)
	{
		$sql = "SELECT * FROM ".$this->tbl_metadata." WHERE uuid='$uuid'";
		$rs = $this->db->query($sql);
		return $rs->fetch();
	}
	
	function DatasFilter($options)
	{
		$wheresql = array();
		
		if(isset($options['east']))
		{
			$wheresql[] = " md.east < ".$options['east'];
		}
		
		if(isset($options['west']))
		{
			$wheresql[] = " md.west > ".$options['west'];
		}
		
		if(isset($options['north']))
		{
			$wheresql[] = " md.north < ".$options['north'];
		}
		
		if(isset($options['south']))
		{
			$wheresql[] = " md.south > ".$options['south'];
		}
		
		if(isset($options['q']))
		{
			if(preg_match("/\'/",$options['q']))
			{
				$q = preg_replace("/\'/","''",$options['q']);
			}else{
				$q = $options['q'];
			}
			$wheresql[] = " md.title LIKE '%$q%' ";
		}
		
		if(count($wheresql)>0)
		{
			$wheresql = " WHERE ".join(" AND ",$wheresql);
		}else{
			$wheresql = "";
		}
			
		$sql = "SELECT md.* FROM ".$this->tbl_metadata." md $wheresql";
		
		$rs = $this->db->query($sql);
		return $rs->fetchAll();
	}
}