39 lines
953 B
PHP
39 lines
953 B
PHP
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<?php
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namespace fastphp\db;
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use PDO;
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use PDOException;
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/**
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* 数据库操作类
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* 其属性$pdo为静态属性，所以在页面执行周期内
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* 只要一次赋值，以后获取的还是首次赋值的内容
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* 这里就是pdo对象，这样可以保证运行期间只有
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* 一个数据库连接对象，简单的单例模式
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* Class Db
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* @package fastphp\db
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*/
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class Db
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{
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private static $pdo = null;
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public static function pdo(){
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if(self::$pdo !== null){
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return self::$pdo;
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}
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try{
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$dns = sprintf('mysql:host=%s;post=%s;dbname=%s;chartset=utf8',DB_HOST,DB_PORT,DB_NAME);
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$option = array(PDO::ATTR_DEFAULT_FETCH_MODE=>PDO::FETCH_ASSOC);
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self::$pdo = new PDO($dns,DB_USER,DB_PASS,$option);
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self::$pdo->query("set names utf8");
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return self::$pdo;
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} catch (PDOException $e){
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exit($e->getMessage());
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}
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}
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}
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