["data_time_stop"]; try { $conn = new PDO("mysql:host=$servername;port=3306;dbname=$dbname", $username, $password);//链接数据库 $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // 设置 PDO 错误模式为异常 $sql = "select data_time,temperature,humidity from humiture_...
PDOStatement::rowCount():主要是用于PDO::query()和PDO::prepare()进行DELETE、INSERT、UPDATE操作影响的结果集,对PDO::exec()方法和SELECT操作无效。 5、PDO操作MYSQL数据库实例 $pdo = new PDO("mysql:host=localhost;dbname=db_demo","root",""); if($pdo -> exec("insert into db_demo(name,content...
$dsn = "mysql:host={$config['db_host']};port={$config['db_port']};dbname={$config['db_name']}"; try { $this->pdo = new PDO($dsn, $config['db_user'], $config['db_pass']); $this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); } catch (PDOException $e)...
<?php try { $dbh = new PDO('mysql:host=localhost;dbname=test', 'root', ''); $dbh->query('set names utf8;'); $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $dbh->beginTransaction(); $dbh->exec("Insert INTO `test`.`table` (`name` ,`age`)VALUES ('mick'...
private $pdo; private $error; // 连接数据库 public function __construct($config) { $dsn = "mysql:host={$config['db_host']};port={$config['db_port']};dbname={$config['db_name']}"; try { $this->pdo = new PDO($dsn, $config['db_user'], $config['db_pass']); ...
而“民间”给出的结果很多是倾向于使用PDO,因为其不担有跨库的优点,更有读写速度快的特点。 1、PHP与Mysql扩展(本扩展自 PHP 5.5.0 起已废弃,并在将来会被移除),PHP原生的方式去连接数据库,是面向过程的 <?php $mysql_conf = array( 'host' => '127.0.0.1:3306', 'db' => 'test', 'db_user'...
}//连接MySQLprotectedfunctionconnect(array$config){$dsn=sprintf("mysql:host=%s;dbname=%s;charset=%s",$config['host'],$config['database'],$config['charset']);$this->link =newPDO($dsn,$config['user'],$config['password']); }//查询publicfunctionquery(string$sql,array$values=[]){$query...
foreach ($dbh->query('SELECT * from FOO') as $row) { print_r($row); //你可以用 echo($GLOBAL); 来看到这些值 } */ $dbh=null; }catch(PDOException$e){ die("Error!: ".$e->getMessage().""); } //默认这个不是长连接,如果需要数据库长连接,需要最后加一个参数:array(PDO::ATTR_...
连接到 MySQL<?php $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass); ?>注意:如果有任何连接错误,将抛出一个 PDOException 异常对象。处理连接错误<?php try { $dbh = new PDO('mysql:host=localhost;dbname=test', $user, $pass); foreach($dbh->query('SELECT * from FOO'...
优点可以说是非常多了,常见的优点就是便于维护、复用、高效、安全、易扩展。例如PDO支持的数据库类型是非常多的,与mysqli不同的就是,PDO还支持其他数据库...