php PDO：数据访问抽象层

Posted 2020-07-27 哔哩哔哩干杯

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了php PDO：数据访问抽象层相关的知识，希望对你有一定的参考价值。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<?php

//PDO：数据访问抽象层
//dsn：数据源
//1.带有事务功能：
$dsn="mysql:host=localhost;dbname=bilibili";
//造PDO对象
$pdo=new PDO($dsn,"root","");

//设置为异常模式
$pdo->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_EXCEPTION );

try
{
    //写SQL语句
    $sql="insert into nation values (\'n007\',\'白族\')";
    $sql1="insert into nation values (\'n002\',\'白族\')";
    //$sql2="insert into nation values (\'n008\',\'白族\')";
    
    //启动事务
    $pdo->beginTransaction();
    
    //执行SQL语句
    $pdo->exec($sql);
    $pdo->exec($sql1);
    //$pdo->exec($sql2);
    
    $pdo->commit();
}
catch (PDOException $e)
{
    //echo $e->getMessage();
    //回滚事务
    $pdo->rollBack();
}


/*foreach($a as $v)
{
    var_dump($v);    
}
*/




?>
</body>
</html>

View Code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<?php

//2.防止SQL注入攻击
$dsn="mysql:host=localhost;dbname=bilibili";
$pdo=new PDO($dsn,"root","");

$sql="insert into nation values(?,?)";

//将一条SQL语句放到服务器等待执行
$stm=$pdo->prepare($sql);

/*//绑定参数
$stm->bindParam(1,$code);
$stm->bindParam(2,$name);

//给变量赋值
$code="n030";
$name="蒙古";*/


$attr=array("n031","壮族");

//执行预处理语句,执行成功返回true，执行失败返回false
if($stm->execute($attr))
{
    //var_dump($stm->fetch());    
    //var_dump($stm->fetchAll(PDO::FETCH_ASSOC));
}


?>
</body>
</html>

View Code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>

<body>
<?php

//2.防止SQL注入攻击
$dsn="mysql:host=localhost;dbname=bilibili";
$pdo=new PDO($dsn,"root","");

$sql="insert into nation values(:code,:name)";

//将一条SQL语句放到服务器等待执行
$stm=$pdo->prepare($sql);

/*//绑定参数
$stm->bindParam(1,$code);
$stm->bindParam(2,$name);

//给变量赋值
$code="n030";
$name="蒙古";*/


$attr=array("code"=>"n032","name"=>"土家");

//执行预处理语句,执行成功返回true，执行失败返回false
if($stm->execute($attr))
{
    //var_dump($stm->fetch());    
    //var_dump($stm->fetchAll(PDO::FETCH_ASSOC));
}


?>
</body>
</html>

View Code

以上是关于php PDO：数据访问抽象层的主要内容，如果未能解决你的问题，请参考以下文章