ZPF MYSQL数据库层多实例实现

 1 class mysqldb
 2 {
 3     //多主机实例
 4     private static $instance = array();
 5     //连接
 6     public $link = null;
 7     
 8     public $_database = ‘‘;//当前数据库名
 9     public $_tablename = ‘‘;//当前表的表名
10     public $_dt =‘‘;//database.tablename
11     
12     
13     //如果主机没变,并且已经存在MYSQL连接,就不再创建新的连接
14     //如果主机改变,就再生成一个实例创建一个连接
15     public static function getInstance($host, $username, $password, $database, $tablename)
16     {
17         if (empty(self::$instance[$host])) {
18             $rc = new ReflectionClass(‘mysqldb‘);
19             self::$instance[$host] = $rc->newInstanceArgs(array($host, $username, $password, $database, $tablename));
20         }
21 
22         return self::$instance[$host];
23     }
24     
25     public function __construct($host, $username, $password, $database, $tablename)
26     {
27         $this->link = new mysqli($host, $username, $password);
28         if($this->link->connect_error) {
29             echo $this->link->connect_error,‘<br>‘;
30             exit;
31         }
32         $this->_database = $database;//database name
33         $this->_tablename = $tablename;//table name
34         $this->_dt = "`{$this->_database}`.`{$this->_tablename}`";
35 
36         $this->link->query("set names utf8");
37     }
38 }

1     public function testmysqls()
2     {
3         $obj1 = $this->getlink(‘tiezi‘);
4         $obj2 = $this->getlink(‘name‘);
5 
6         $arr1 = $obj1->select(‘‘, ‘‘, ‘‘, 1);
7         $arr2 = $obj2->select(‘‘, ‘‘, ‘‘, 1);
8         var_dump($arr1, $arr2);
9     }