php mysql連接方式pdo用法詳解

$dbh = new PDO('mysql:host=localhost;dbname=access_control', 'root', '');
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$dbh->exec('設定名稱 utf8');
/*新增*/
//$sql = "INSERT INTO `user` SET `login`=:login AND `password`=:password";
$sql = "INSERT INTO `user` (`login` ,`password`)VALUES (:login, :password)";  $stmt = $dbh->準備($sql);  $stmt->execute(array(':login'=>'kevin2',':password'=>''));
echo $dbh->lastinsertid();
/*修改*/
$sql = "UPDATE `user` SET `password`=:password WHERE `user_id`=:userId";
$stmt = $dbh->準備($sql);
$stmt->execute(array(':userId'=>'7', ':password'=>'4607e782c4d86fd5364d7e4508bb10d9'));
echo $stmt->rowCount();
/*刪除*/
$sql = "DELETE FROM `user` WHERE `login` LIKE 'kevin_'"; //kevin%
$stmt = $dbh->prepare($sql);
$stmt->execute();
echo $stmt->rowCount();
/*查詢*/
$login = 'kevin%';
$sql = "SELECT * FROM `user` WHERE `login` LIKE :login";
$stmt = $dbh->準備($sql);
$stmt->execute(array(':login'=>$login));
while($row = $stmt->fetch(PDO::FETCH_ASSOC)){
 print_r($row);
}
print_r( $stmt->fetchAll(PDO::FETCH_ASSOC));
?>

1、建立連接

 $dbh=newPDO('mysql:host=localhost;port=3306; dbname=test',$user,$ pass ,array(
 PDO::ATTR_PERSISTENT=>true
 ));
 ?>

複製程式碼

嘗試{
 $dbh=newPDO('mysql:host=localhost;dbname=test',$user, $dbh=newPDO('mysql:host=localhost;dbname=test',$user, $ $ pass);
 $dbh->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION);
 $dbh->exec("設定字元集utf8");
 $dbh=null ; // 斷線
 }catch(PDOException$e){

複製程式碼

嘗試{
$dbh->setAttribute(PDO::ATTR_ERRMODE,PDOfERRMODE_EXCEPTIONRMODE_ dbh->beginTransaction();//開啟交易
$dbh->exec("insertintostaff(id,first,last)values(23,'Joe','Bloggs')");
$dbh- >exec("insertintosalarychange(id,amount,changedate)
values(23,50000,NOW())");
$dbh->commit();//提交事務
}catch(Exception $e){
$dbh->rollBack();//錯誤回滾
echo"失敗:".$e->getMessage();

複製程式碼

嘗試{
 $dbh = new PDO($dsn, $user, $password);
 $sql = '從 CountryCode =:國家的城市中選擇 *';
 $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_WARNING);
 $stmt = $dbh->準備($sql);
 $stmt->bindParam(':country', $country, PDO::PARAM_STR);
 $stmt->execute();
 while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
 print $row['Name'] 。 「/t」；
 }
 } // 如果有問題我們可以在這裡處理
 catch (PDOException $e) {
 echo 'PDO Exception Caught.  ';
 echo '資料庫錯誤：';
 echo 'SQL查詢：', $sql;

複製程式碼

$dbh->query($sql); 當$sql中變數可以用$dbh->quote($params); //轉義字串的資料
$sql = 'Select * from city where CountryCode ='.$dbh->quote($country);
foreach ($dbh->query($sql) as $row) {
 print $row['Name'] 。 “/t”；
 印出 $row['CountryCode'] 。 “/t”；

2，使用 prepare, bindParam和 execute [建議用,同時可以用新增、修改、刪除]

$dbh->prepare($sql); 產生了個PDOStatement物件
PDOStatement->bindParam()
PDOStatement->execute();//可以在這裡放綁定的對應變數
?>

3、php pdo交易範例

 try {
 $dbh = new PDO('mysql:host=localhost;dbname=test', 'root' , '');
 $dbh->query('set names utf8;');
 $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
 $bhd->Transgindaction ();
 $dbh->exec("Insert INTO `test`.`table` (`name` ,`age`)VALUES ('mick', 22);");
 $dbh-> exec("Insert INTO `test`.`table` (`name` ,`age`)VALUES ('lily', 29);");
 $dbh->exec("Insert INTO `test`.` table` (`name` ,`age`)VALUES ('susan', 21);");
 $dbh->commit();
 } catch (Exception $e) {
 $dbh ->rollBack();
  echo "Failed: " . $e->getMessage();
 }
?>