Foreach和while循环不输出我提取的数据

时间:2015-07-23 02:43:52

标签: php mysql foreach while-loop prepared-statement

我有以下两个准备好的陈述。数据库连接和查询是正确的,我已经在phpmyadmin中测试了它们。我还在我的while fetch循环内部进行了测试,看看我是否正在提取我应该是的数据而且我是。

问题在于我的while和foreach循环或者可能是我的num行语句。我不确定我在那里做错了什么。

我收到此错误:

Warning: mysqli::query() expects parameter 1 to be string, object given

对于这个while循环:

        while ($row2 = $result->fetch_assoc() ) {

我也正在接受我的陈述......

    echo "<p>This topic does not exist.</p>";

即使信息正确回显,我又认为我的循环错了?

有人在我的循环中看到我做错了吗?

$con = new mysqli("localhost", "", "", "");
if (mysqli_connect_errno()) {
    throw new Exception("Connect failed: %s\n", mysqli_connect_error());
    exit();
}
    /* activate reporting */
$driver = new mysqli_driver();
try {
    $cid = $_GET['cid'];
    $tid = $_GET['tid'];
    $userid = ( isset( $_SESSION['user'] ) ? $_SESSION['user'] : "" );
        echo $cid . "<br>";
        echo $tid;
    //Prepare
    if ($stmt = $con->prepare("SELECT * FROM forum_topics WHERE `category_id`=? AND `id`=? LIMIT 1")) {
        $stmt->bind_param("ii", $cid, $tid);
        $stmt->execute();
        $stmt->bind_result($topic_id, $category_id, $topic_title, $topic_creator, $topic_last_user, $topic_date, $topic_reply_date, $topic_views); 

        if (!$stmt) {
            throw new Exception($con->error);
        }
    }



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

     $stmt->store_result();
    $numrows = $stmt->num_rows;
    echo $numrows;
}
    if($numrows == 1){
        echo "<table width='100%'>";
        if ( $_SESSION['user'] ) { 
            echo "<tr><td colspan='2'><input type='submit' value='Add Reply' onclick=\"window.location = 
        'forum_post_reply.php?cid=".$cid."$tid=".$tid."'\"> <hr />";
        } else {
            echo "<tr><td colspan='2'><p>Please log in to add your reply</p><hr /></td></tr>";
        }
        }


    foreach($stmt as $row) {

        //Prepared SELECT stmt to get forum posts
        if($stmt2 = $con->prepare("SELECT `id`, `category_id`, `topic_id`, `post_creator`, `post_content`, `post_date` FROM forum_posts WHERE `category_id`=? AND `topic_id`=?")) {


            $stmt2->bind_param("ii", $cid, $tid);
            $stmt2->execute();
            $stmt2->bind_result($post_id, $post_category_id, $post_topic_id, $post_creator, $post_content, $post_date);

            if (!$stmt2) {
            throw new Exception($con->error);
        }
        }
    }   

        if ($result = $con->query($stmt)) {
            while ($row2 = $result->fetch_assoc() ) {
                echo "<tr><td valign='top' style='border: 1px solid #000000;'>
                <div style='min-height: 125px;'>".$row['topic_title']."<br />
                by ".$row2['post_creator']." - " .$row2['post_date']. "<hr />" . $row2['post_content'] ."</div></td>
                <td width='200' valign='top' align='center' style='border: 1px solid #000000;'>User Info Here!</td></tr>
                <tr><td colspan='2'><hr /></td></tr>";
            }
    }   else {
        echo "<p>This topic does not exist.</p>";
        }
}
catch (Exception $e)
{
    echo "Error: " . $e->getMessage();
}

1 个答案:

答案 0 :(得分:2)

如果您在浏览器中使用ctrl-F搜索$ stmt(并忽略$ stmt2),您会注意到$ stmt一直是prepared statement一直到错误行。 $ stmt作为prepare的返回类型生效,绑定并执行。

稍后你:

if ($result = $con->query($stmt)) {

所以$ con&gt; query()期待一个字符串,而不是一个对象,不是吗?

来自manual

并不是说显微镜下没有其他东西可以考虑,但我希望这能为您解答错误信息。

修改

显然,你不能将bind_result与select *一起使用。阅读接受这个问题的男士接受的答案。他做了2个例子,1个没有选择*。另请注意store_result()

以下是link对他的答案的推荐。