Question

我正在玩PDO，但有些奇怪的事情正在发生，我似乎无法弄明白。没有错误产生。只是没有插入数据库。

的index.php

<?php
error_reporting(E_ALL); 
require('includes/classes.php');
require_once('includes/config.php');

$db = new DatabaseCon();
$db->dbConnect($config);

$stmt = $db->prepare("INSERT INTO images (filename) VALUES (?)");
$stmt->bindParam(1, "hello world!");
$stmt->execute();
?>

classes.php

<?php
error_reporting(E_ALL);
require('config.php');

// Connect to database
// Does not handle anything else
class DatabaseCon {
    public $dbh;

    // Method to connect to database
    function dbConnect($config) {
        try {
            $dbh = new PDO("mysql:host=" . $config['host'] . ";dbname=" . $config['dbname'], $config['dbuser'], $config['dbpass']);
            //$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_SILENT);
        } catch (PDOException $e) {
            echo $e->getMessage();
        }
    }
}

的config.php

<?php
error_reporting(E_ALL);

$config = array(
    'host' => 'localhost',  // Database hostname (usually localhost)
    'dbuser' => 'admin_mp', // Database username
    'dbpass' => 'mypassword here', // Database password
    'dbname' => 'mpdb' // Database name
);

当我导航到index.php时，应该将“hello world”插入到数据库中，但事实并非如此。谁能找到我在这里做错了什么？

Answer 1

更改

$dbh = new PDO("mysql:host=" . $config['host'] . ";dbname=" . $config['dbname'], $config['dbuser'], $config['dbpass']);

到

$this->dbh = new PDO("mysql:host=" . $config['host'] . ";dbname=" . $config['dbname'], $config['dbuser'], $config['dbpass']);

更改

$stmt = $db->execute("INSERT INTO images (filename) VALUES (?)");
$stmt->bindParam(1, "hello world!");
$stmt->execute();

到

error_reporting(E_ALL);
$stmt = $db->dbh->prepare("INSERT INTO images (filename) VALUES (?)");
if (!$stmt) die ('prepare() failed!');
$h = "hello world!";
$rv = $stmt->bindParam(1, $h);
if (!$rv) die ('bindParam() failed!');
$rv = $stmt->execute();
if (!$rv) die ('execute() failed!');

Answer 2

试试这个：

<强>的index.php

<?php
error_reporting(E_ALL); 
ini_set('display_errors', 1);
require('includes/classes.php');
require_once('includes/config.php');

$db = new DatabaseCon();
$db = $db->dbConnect($config);

$stmt = $db->prepare("INSERT INTO images (filename) VALUES (?)");
$stmt->bindParam(1, "hello world!");
$stmt->execute();
?>

<强> classes.php

<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
require('config.php');

// Connect to database
// Does not handle anything else
class DatabaseCon {

    // Method to connect to database
    function dbConnect($config) {
        try {
            $dbh = new PDO("mysql:host=" . $config['host'] . ";dbname=" . $config['dbname'], $config['dbuser'], $config['dbpass']);
            //$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_SILENT);
            return $dbh;
        } catch (PDOException $e) {
            echo $e->getMessage();
                    return false;
        }

    }
}

DatabaseCon应该充当工厂来创建连接对象。

Answer 3

感谢@BenRowe的帮助，我找到了问题，现在已修复。结合使用$ this关键字，删除“hello world！”调用bindParam（）的部分修复了它。似乎bindParam（）方法只接受基于引用的值。所以我将随机变量$ h设置为“hello world！”，并将bindParam（1，“hello world”）更改为bindParam（1，$ h）。

谢谢大家：）

有PDO的麻烦，但没有错误

3 个答案: