Question

我有以下脚本根本没有返回任何东西，我得到的最好的是一个var_dump来表示bool（false）..我的error_log中什么也没有，并且没有抛出任何异常：< / p>

的index.php：

require("php/bootstrap.php");
$campaign = new Campaign($_GET['campaign'], $mysql);

bootstrap.php中：

define ("MYSQL_USER", "specialagent");
define ("MYSQL_PASS", "supertopsecret");
define ("MYSQL_HOST", "127.0.0.1");
define ("MYSQL_PORT", "3306");
define ("MYSQL_DB", "databasewithsecretinformation");


/* Auto include classes on instantiation */
function __autoload($class_name) {
    include 'classes/'.$class_name.'.php';
}

/* Connections */
try {
$mysql = new PDO("mysql:host=".MYSQL_HOST.";dbname=test", MYSQL_USER, MYSQL_PASS);
} catch(PDOException $e) {
die("There was a problem connecting to the database. Error: " . $e->getMessage());
}

Campaign.php

class Campaign {
protected $dbh;
private $campaign_id = "";
private $name = "";

public function __construct ($campaign_id, PDO $db) {

    //if ($campaign_id) {
        $this->setCampaignID($campaign_id);
        $this->dbh = $db;
        $this->loadCampaignInfo();
    //}
}


public function getCampaignID() {
    return $this->campaign_id;
}

public function setCampaignID($id) {
    $this->campaign_id = $id;
}

public function __destruct() {
    //$this->dbh = null;
}

public function loadCampaignInfo() {
    /* Get info from database */
    $sql = "SELECT * FROM campaigns WHERE campaign=:campaignID";

    try {
        echo "trying query...$sql<br />";
        if ($this->dbh instanceof PDO) {
            $stmt = $this->dbh->prepare($sql);
            $stmt->bindParam(":campaignID", $this->campaign_id, PDO::PARAM_STR);
            $stmt->execute();
            $row = $stmt->fetch();

            echo "Returned Data: ";
            var_dump($row);
        } else {
            echo "Not a valid PDO resource";
        }


    } catch (PDOException $e) {
        echo "Problem : " . $e->getMessage;
    } catch (Exception $e) {
        echo "Other problem : " . $e->getMessage;
    }


    /* Set properties */
}

}

输出：

trying query...SELECT * FROM campaigns WHERE campaign=:campaignID
Returned Data: bool(false)

Answer 1

问题与PDO无关 Returned Data: bool(false)表示没有找到符合条件的行检查您的表格是否包含数据并检查输入检查你是否从autoload和所有类似的东西中获得了正确的课程。

另外，将引导程序连接更改为

ini_set('display_errors',1);
error_reporting(E_ALL);

/* Connections */
$mysql = new PDO("mysql:host=".MYSQL_HOST.";dbname=test", MYSQL_USER, MYSQL_PASS);
$mysql->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );

你也可能希望这个方法不那么臃肿：

/* Get info from database */
public function loadCampaignInfo()
{
    $sql = "SELECT * FROM campaigns WHERE campaign=?";
    $stmt = $this->dbh->prepare($sql);
    $stmt->execute([$this->campaign_id]);
    return $stmt->fetch();
}

Answer 2

问题是用户没有正确的权限访问数据库，在您的常识提示信用证问题后，登录到MySQL cli并注意到数据库不在SHOW DATABASES中。

感谢大家的帮助。

PHP PDO不从其他类返回任何数据

2 个答案: