封装 DBDA 类 StrQuery 、JSONQuery

<?php
class DBDA
{ 
	public $host="localhost";
	public $uid="root";
	public $pwd="密码";
	public $dbname="数据库名";
	
	//成员方法
	public function Query($sql,$type=1)
	{
		$db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
		$r = $db->query($sql);
		
		if ($type==1)
		{
			return $r->fetch_all();	
		}
		
		else
		{
			return $r;
		}
	}
	


//返回字符串的方法 
	public function StrQuery($sql,$type=1)
	{
		$db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
		$r = $db->query($sql);
		
		if($type==1)
		{
			$attr = $r->fetch_all();
			$str = "";
			foreach($attr as $v)
			{
				$str .= implode("^",$v)."|";
			}
			
			return substr($str,0,strlen($str)-1);

		}
		else
		{
			return $r;
		}
	}
	
	
	//返回JSON
	function JSONQuery($sql,$type=1)
	
	{
		$db = new MySQLi($this->host,$this->uid,$this->pwd,$this->dbname);
		$r = $db->query($sql);
		
		if ($type==1)
		{
			return json_encode ($r->fetch_all(MYSQLI_ASSOC));//返回关联数组  fet_all 慎用 放在服务器上有问题 要求配置
		}
		
		else
		{
			return $r;
		}
	}
	
	
	
}