Php 如何正确地从mysql迁移到PDO

更新： 这个问题已经回答了 我有一个简单的表单，用户可以在其中更新mysql数据库。我曾使用

mysql\uquot/code>连接到数据库，但我知道pdo是一种更好的连接方式，因为
mysql\uquot/code>被贬低了

以下是旧方法的完整形式，然后是新方法的完整形式。
新方法会产生错误

老办法：

<?php

$host = 'ip_address';
$user = 'user_name';
$password = 'password';

$link = mysql_connect($host, $user, $password);

$selected = mysql_select_db('db_name', $link);

if(!isset($_POST['text-input']))

?>

<form method="post">
    %slice%
    <input type="submit" value="Submit" />
</form>
%[if !edit]%

<?php
%[repeat items]%
$form_input%id=repeatIndex% =  $_POST['element-%id=repeatIndex%'] ;
%[endrepeat]%

$query = 'INSERT INTO `table_name` (%[repeat items]%%[endif]%%html="Edit Me"%%[if !edit]%,%[endrepeat]%) VALUES (%[repeat items]%"' . $form_input%id=repeatIndex% . '",%[endrepeat]%);';
$query = preg_replace('/,\);/',');',$query);
$query = preg_replace('/,\) /',')',$query);
mysql_query($query);

?>
%[endif]%

我希望我已经提供了足够的信息。
解决方案如下：

<?php

//Connection vars
$host = '%id=server%';
$user = '%id=username%';
$password = '%id=password%';
$databasename = '%id=database%';

//This block establishes the connection
try{
    //
    $connectiondetails = "mysql:host={$host};dbname={$databasename}";
    $db = new PDO($connectiondetails , $user , $password);
    $db->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_WARNING);
}
catch (PDOException $e) {
    print "Error!: " . $e->getMessage() . "<br/>";
    die();
}

//Check if all the input fields of the form have been submitted
if(
    %[repeat items]%
    isset($_POST['element-%id=repeatIndex%'])&&
    %[endrepeat]%
    (true===true)
){


    //The variables to read the output
    %[repeat items]%
    $form_input%id=repeatIndex% = $_POST["element-%id=repeatIndex%"] ;
    %[endrepeat]%

    //DB
    global $db;     //must set this, otherwise can't access the db  
    $query =  'INSERT INTO `%id=table%` (%[endif]%%[repeat items]%%html="Edit Me"%%[if !edit]%,%[endif]%%[endrepeat]%%[if !edit]%)%[endif]% %[if !edit]%VALUES (%[repeat items]%"' . $form_input%id=repeatIndex% . '",%[endrepeat]%);';
    $query = preg_replace('/,\);/',');',$query);
    $query = preg_replace('/,\) /',')',$query);
    $db->query($query);
    //[DB]
}

?> 

您仍在使用PDO调用
mysql\u query（）
。这两者不相容。使用
prepare（）
execute（）
或
query（）
查看许多示例。尽管它是关于SQL注入的，但它为您提供了有关PDO的基本信息。
Warning: mysql_query() [function.mysql-query]: Access denied for user
'kuler'@'localhost' (using password: NO) in
/home/path_to/index.php on line 125

Warning: mysql_query() [function.mysql-query]: A link to the server could not be
established in /home/path_to/index.php on line 125

<?php

//Connection vars
$host = '%id=server%';
$user = '%id=username%';
$password = '%id=password%';
$databasename = '%id=database%';

//This block establishes the connection
try{
    //
    $connectiondetails = "mysql:host={$host};dbname={$databasename}";
    $db = new PDO($connectiondetails , $user , $password);
    $db->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_WARNING);
}
catch (PDOException $e) {
    print "Error!: " . $e->getMessage() . "<br/>";
    die();
}

//Check if all the input fields of the form have been submitted
if(
    %[repeat items]%
    isset($_POST['element-%id=repeatIndex%'])&&
    %[endrepeat]%
    (true===true)
){


    //The variables to read the output
    %[repeat items]%
    $form_input%id=repeatIndex% = $_POST["element-%id=repeatIndex%"] ;
    %[endrepeat]%

    //DB
    global $db;     //must set this, otherwise can't access the db  
    $query =  'INSERT INTO `%id=table%` (%[endif]%%[repeat items]%%html="Edit Me"%%[if !edit]%,%[endif]%%[endrepeat]%%[if !edit]%)%[endif]% %[if !edit]%VALUES (%[repeat items]%"' . $form_input%id=repeatIndex% . '",%[endrepeat]%);';
    $query = preg_replace('/,\);/',');',$query);
    $query = preg_replace('/,\) /',')',$query);
    $db->query($query);
    //[DB]
}

?>