1.說明

1.適配器模式： 能夠將截然不同的函數接口封裝成統一的API
2.實際應用舉例，PHP的數據庫操作有mysql, mysqli, pdo3種。能夠用適配器模式統一成一致。相似的場景還有cache適配器，就是將memcache，redis，file，apc等不同的緩存函數統一成一致的
3.以下的樣例能夠幫助你對付各種數據庫鏈接功能，mysql mysqli, pdo隨便選，操作都抽象為統一的接口client不須要改動一行數據庫鏈接方式

2.創建一個接口

interface IDatabase {function connect($host, $user, $passwd, $dbname);function query($sql);function close(); }

3.Mysql封裝

class MySQL implements IDatabase {protected $conn;function connect($host, $user, $passwd, $dbname){$conn = mysql_connect($host, $user, $passwd);mysql_select_db($dbname, $conn);$this->conn = $conn;}function query($sql){$res = mysql_query($sql, $this->conn);return $res;}function close(){mysql_close($this->conn);} }

4.MySqli封裝

class MySQLi implements IDatabase {protected $conn;function connect($host, $user, $passwd, $dbname){$conn = mysqli_connect($host, $user, $passwd, $dbname);$this->conn = $conn;}function query($sql){return mysqli_query($this->conn, $sql);}function close(){mysqli_close($this->conn);} }

5.PDO封裝

class PDO implements IDatabase {protected $conn;function connect($host, $user, $passwd, $dbname){$conn = new \PDO("mysql:host=$host;dbname=$dbname", $user, $passwd);$this->conn = $conn;}function query($sql){return $this->conn->query($sql);}function close(){unset($this->conn);} }

6.實例調用，（統一接口調用）

$db = new PDO(); $db->connect('127.0.0.1', 'root', 'root', 'test'); $db->query('show databases'); $db->close();$db = MySQLi (); $db->connect('127.0.0.1', 'root', 'root', 'test'); $db->query('show databases'); $db->close();$db = MySQl PDO(); $db->connect('127.0.0.1', 'root', 'root', 'test'); $db->query('show databases'); $db->close();

轉載于:https://www.cnblogs.com/mengfanrong/p/5183819.html

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