Php PDO查询未返回任何结果，但查询有效

好的，这里有一些我已经为你们调试过的信息

数据库已连接

查询（使用echo打印时）在PHPMYADMIN中运行良好，返回7行

查询（与旧的mysql_查询函数一起使用时效果良好）

我已经读到，PDO SQL不允许同时进行多个查询。。。但这不是一个单一的查询吗？如果不是，我想我必须回到旧版本

以下是查询（使用echo从PHP文件打印）

其中，在PHPMYADMIN上返回以下内容：

 Showing rows 0 - 6 (7 total, Query took 0.0004 sec) [Date: 2014-05-26 - 2014-05-13]

这是密码

try {
    $count=0;
    $statement = $SQLConnection->prepare('
        SELECT `Date`, SUM(`Amount`), `Quantity Sold` FROM ' . $SQLConfig["SQL_DATA_TABLE"] . '
        WHERE Date BETWEEN DATE_SUB(CURDATE(), INTERVAL 15 DAY) AND CURDATE() 
        GROUP BY Date ORDER BY Date DESC');
    $statement->execute();

    //echo "<tr><td>test</td><td>test</td><td>test</td></tr>";

    foreach($statement as $row) {
        echo "Row: " . $count;
        $count++;
    }
} catch (PDOException $e) {
    die("Error!: " . $e->getMessage() . "<br/>");
}

然后将foreach更改为

while($row = $statement->fetch()){

但是，它仍然没有返回任何行

我决定最后一次返回到另一个系统，同时保持查询未经编辑，并且使用以下方法可以完美地工作：

mysql_select_db($SQLConfig["SQL_DATABASE"])or die("Error: Cannot locate database");
$statement = 'SELECT `Date`, SUM(`Amount`), `Quantity Sold` FROM ' . $SQLConfig["SQL_DATA_TABLE"] . '
    WHERE Date BETWEEN DATE_SUB(CURDATE(), INTERVAL 15 DAY) AND CURDATE() 
    GROUP BY Date ORDER BY Date DESC';
$results = mysql_query($statement);
while($row = mysql_fetch_array($results)) {

使用SQLi尝试了相同的代码，结果为零。见鬼：/I我正试图转换我的项目，使其安全，并在必要时使用准备好的语句，但这使它变得极其困难

使用Sqli的代码

if($statement = $SQLConnection->prepare('
    SELECT `Date`, SUM(`Amount`), `Quantity Sold` FROM ' . $SQLConfig["SQL_DATA_TABLE"] . '
    WHERE Date BETWEEN DATE_SUB(CURDATE(), INTERVAL 15 DAY) AND CURDATE() 
    GROUP BY Date ORDER BY Date DESC')) 
{
    $statement->execute();
    $statement->bind_result($result);
    $statement->fetch();
    echo "Row: " .$result;
}

根据要求，$SQLConnection是什么：

<?php
    $configuration = include_once 'Configuration.php';

    $PDOConnection = new PDO('mysql:host' .$Configuration["SQL_HOST"]. ';dbname='.$Configuration["SQL_DATABASE"], $configuration["SQL_USERNAME"], $configuration["SQL_PASSWORD"]);  
    $NormalConnection = mysql_connect($Configuration["SQL_HOST"], $Configuration["SQL_USERNAME"], $Configuration["SQL_PASSWORD"]) or die("Error: Failure to connect to host.");
    $SQLiConnection = new mysqli($Configuration["SQL_HOST"], $Configuration["SQL_USERNAME"], $Configuration["SQL_PASSWORD"], $configuration["SQL_DATABASE"]);             

    if(mysqli_connect_errno()) {
       echo "Connection Failed: " . mysqli_connect_errno();
    }
?>

---

---

在

$statement->execute（）之后添加
$statement->fetchAll（）同时尝试SQLi和PDO，我将发布back@Daan两者的输出都没有变化。此外，PDO还需要fetchAll（PDO:：FETCH_ASSOC）version@ChristianTucker
var_dump（$statement->fetchAll（PDO:：FETCH_ASSOC））的输出是什么？似乎您应该向我们展示什么是SQLConnection，以及这个对象的类是如何定义的
if($statement = $SQLConnection->prepare('
    SELECT `Date`, SUM(`Amount`), `Quantity Sold` FROM ' . $SQLConfig["SQL_DATA_TABLE"] . '
    WHERE Date BETWEEN DATE_SUB(CURDATE(), INTERVAL 15 DAY) AND CURDATE() 
    GROUP BY Date ORDER BY Date DESC')) 
{
    $statement->execute();
    $statement->bind_result($result);
    $statement->fetch();
    echo "Row: " .$result;
}

<?php
    $configuration = include_once 'Configuration.php';

    $PDOConnection = new PDO('mysql:host' .$Configuration["SQL_HOST"]. ';dbname='.$Configuration["SQL_DATABASE"], $configuration["SQL_USERNAME"], $configuration["SQL_PASSWORD"]);  
    $NormalConnection = mysql_connect($Configuration["SQL_HOST"], $Configuration["SQL_USERNAME"], $Configuration["SQL_PASSWORD"]) or die("Error: Failure to connect to host.");
    $SQLiConnection = new mysqli($Configuration["SQL_HOST"], $Configuration["SQL_USERNAME"], $Configuration["SQL_PASSWORD"], $configuration["SQL_DATABASE"]);             

    if(mysqli_connect_errno()) {
       echo "Connection Failed: " . mysqli_connect_errno();
    }
?>

createIndex($PDOConnection, $Configuration);

function createIndex($SQLConnection, $SQLConfig) {