Question

我最近开始使用PDO，之前我使用过Mysql函数。现在我正在尝试通过上一个网页中的选定ID获取并显示记录。我很少使用Connexion Class

Class Connexion {

private $host = "localhost";
private $user = "root";
private $pass = "";
private $dbname = "cvtheque";
private $dbh;
private $stmt;

public function __construct() {
    $dsn = 'mysql:host=' . $this->host . ';dbname=' . $this->dbname;
    // Set options
    $options = array(
        PDO::ATTR_PERSISTENT => true,
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
    );
    // Create a new PDO instanace
    try {
        $this->dbh = new PDO($dsn, $this->user, $this->pass, $options);
    }
    // Catch any errors
    catch (PDOException $e) {
        echo "Connexion Error: " . $e->getMessage();
    }
}

public function query($query) {
    $this->stmt = $this->dbh->prepare($query);
}

public function bind($param, $value, $type = null) {
    if (is_null($type)) {
        switch (true) {
            case is_int($value):
                $type = PDO::PARAM_INT;
                break;
            case is_bool($value):
                $type = PDO::PARAM_BOOL;
                break;
            case is_null($value):
                $type = PDO::PARAM_NULL;
                break;
            default:
                $type = PDO::PARAM_STR;
        }
    }
    $this->stmt->bindValue($param, $value, $type);
}

public function execute() {
    return $this->stmt->execute();
}

public function resultset() {
    $this->execute();
    return $this->stmt->fetchAll(PDO::FETCH_ASSOC);
}

public function single() {
    $this->execute();
    return $this->stmt->fetch(PDO::FETCH_ASSOC);
}

public function rowCount() {
    return $this->stmt->rowCount();
}

public function lastInsertId() {
    return $this->dbh->lastInsertId();
}

public function beginTransaction() {
    return $this->dbh->beginTransaction();
}

public function endTransaction() {
    return $this->dbh->commit();
}

public function cancelTransaction() {
    return $this->dbh->rollBack();
}

public function debugDumpParams() {
    return $this->stmt->debugDumpParams();
 }
}

我使用这些脚本来显示数据库中的项目

<?php
$c = new Connexion();
$c->query("select * from annonce order by 'client' DESC Limit 20");
$rows = $c->resultset();  ?>
 <div class="Joblist" charset="UTF-8">
                <?php foreach($rows as $r) { ?>
        <p class="Title">
          <span class="Ref"></span>
          <a href="details.php?id=<?php echo($r['id_annonce']) ?>">
                <?php echo($r['poste']); ?></a></p>
        <p class="Date"><span class="Fright"><?php echo($r['type_contrat']); ?></span>
        <span><a href="http://www.maximus-it.com/job-search-result.php?sector=1#"  class="Sectorbtn"><?php echo($r['client']); ?></a></span></p>
        <p style="text-align:justify;"><?php echo tronque($r['desc_annonce'], 230);?></p>
        <p class="More"><a href="details.php?id=<?php echo($r['id_annonce']) ?>">Voir plus</a>       </p>
              <?php }?>
 </div>

然后我使用这些方法按ID从URL

中选择行

 <?php
   require_once '../Model/Connexion.php';
   $c = new Connexion();
   if (isset($_GET['code'])) {
            $results = $c->query("select * from annonce where id=".$_GET['code']);
            $row = $c->single();
                             }
?>

 <div class="Content FCKeditor">
     <a style="float:right" href="javascript:history.go(-1);">back</a>

    <?php while($row) { ?>  
      <h1><?php echo($r['poste']); ?></h1>
          <div class="Jobdetails">
        <p class="Date"><span></span> | 
            <span><a href="job-details.php?id=792" class="Sectorbtn"><?php echo($r['client']); ?></a></span> | 
            <span><?php echo($r['type_contrat']); ?></span>
        </p>
            <?php echo($r['desc_annonce']); ?>
            <?php }?>
          </div>

 </div>

它显示＆＃34;未定义的变量：$ row＆＃34;在这一行，怎么解决这个问题？

Answer 1

此single()功能不正确

public function single() {
    $this->execute();
    return $this->stmt->fetch(PDO::FETCH_ASSOC);
}

应该是

public function single() {
    $this->stmt->execute();
    return $this->stmt->fetch(PDO::FETCH_ASSOC);
}

同样适用于resultset()：

public function resultset() {
    $this->stmt->execute();
    return $this->stmt->fetchAll(PDO::FETCH_ASSOC);
}

除了getter和setter之外，大多数这些函数都是一个无意义的内容，但实际情况并非如此，如果需要可重用性，可以用构造函数逻辑创建一个函数

public function get_connexion() {
    return $this->dbh;
}

php

<?php
if (isset($_GET['code'])) {
    //require only when code is set
    require_once '../Model/Connexion.php';
    //create conn
    $db = new Connexion();
    $conn = $db->get_connexion();
    $stmt = $conn->prepare('select * from annonce where id = ?');
    $stmt->execute(array($_GET['code']));
    $row = $stmt->fetch(PDO::FETCH_ASSOC);  
}
?>

HTML （自单曲以来没有循环）

<div class="Content FCKeditor">
     <a style="float:right" href="javascript:history.go(-1);">back</a>
      <h1><?php echo($row['poste']); ?></h1>
          <div class="Jobdetails">
        <p class="Date"><span></span> | 
            <span><a href="job-details.php?id=792" class="Sectorbtn"><?php echo($row['client']); ?></a></span> | 
            <span><?php echo($row['type_contrat']); ?></span>
        </p>
            <?php echo($row['desc_annonce']); ?>
          </div>
 </div>

避免使用Sql注入：

<?php 
require_once '../Model/Connexion.php'; 
$c = new Connexion(); 
$c->query('select * from annonce where id_annonce= :id'); 
$c->bind(':id', $_GET['id']);
$r = $c->single(); 
?>

按选定的ID显示行

1 个答案: