php pdo 类 方法有哪些

php pdo类方法有：1、exec方法；2、query方法；3、lastInsertId方法；4、setAttribute方法等等。

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pdo类常用方法:

exec()

query()

lastInsertId()

<?php
$servername = "localhost";
$username = "root";
$password = "133nubia022";
$dbname='myweb';

$pdo= new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$pdo->exec('set names utf8');

$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE,PDO::FETCH_BOTH);

$sql="insert into user(username,age) values('user123','55')";

if($pdo->exec($sql)){
	$lastid=$pdo->lastInsertId();
	echo "ID为{$lastid}的数据插入成功！";
}
?>

? setAttribute()

设置获取模式属性

<?php
$servername = "localhost";
$username = "root";
$password = "133nubia022";
$dbname='myweb';
 

$pdo= new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);

$pdo->exec('set names utf8');
$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE,PDO::FETCH_ASSOC);

$sql="select * from user";

$smt=$pdo->query($sql);
$rows=$smt->fetchAll();

echo '<pre>';
print_r($rows);
echo '</pre>';
?>

***
获取索引数组

<?php
$servername = "localhost";
$username = "root";
$password = "133nubia022";
$dbname='myweb';

$pdo= new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$pdo->exec('set names utf8');

$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE,PDO::FETCH_NUM);

$sql="select * from user";
$smt=$pdo->query($sql);
$rows=$smt->fetchAll();

echo '<pre>';
print_r($rows);
echo '</pre>';
?>

获取混合数组

<?php
$servername = "localhost";
$username = "root";
$password = "133nubia022";
$dbname='myweb';

$pdo= new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$pdo->exec('set names utf8');

$pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE,PDO::FETCH_BOTH);

$sql="select * from user";
$smt=$pdo->query($sql);
$rows=$smt->fetchAll();

echo '<pre>';
print_r($rows);
echo '</pre>';
?>