Question

我有以下代码：

$sql = $pdo->query("SELECT pageid FROM webpages WHERE ISNULL(deleted) ORDER BY sortindex"); 
while ($row = $sql->fetch(PDO::FETCH_ASSOC)) {
  switch ($row["pageid"]) {
  case "information":
    Write("  <li class='top'><a href='index.php?m=info' id='info' class='top_link'><span class='down'>Information</span></a>");
    Write("    <ul class='sub'>");
    Write("      <li><a href='index.php?m=info&submode=n'>News</a></li>");
    Write("      <li><a href='index.php?m=info&submode=e'>Events</a></li>");
    Write("      <li><a href='index.php?m=info&submode=m'>Minutes</a></li>");
    $subsql = $pdo->query("SELECT * FROM categories WHERE visible = 1 ORDER BY sortindex,category"); 
    while ($catrow = $subsql->fetch(PDO::FETCH_ASSOC)) Write("      <li><a href='index.php?m=info&cat={$catrow["cid"]}'>{$catrow["category"]}</a></li>");
    Write("    </ul>");
    break;
  }
}

当我运行它时，我得到＆＃34;致命错误：在第29行＆＃34; /chroot/home/web/html/test.php中的非对象上调用成员函数fetch（）;第29行是＆＃34;而（catrow ...＆＃34; line。

在我的开发服务器上，它可以工作。我应该检查一下如何使其在生产服务器上运行？我不知道为什么会失败。如果我将代码移出第一个SQL循环，它在生产上工作正常。这没问题：

$sql = $pdo->query("SELECT pageid FROM webpages WHERE ISNULL(deleted) ORDER BY sortindex"); 
while ($row = $sql->fetch(PDO::FETCH_ASSOC)) {
  switch ($row["pageid"]) {
  case "information":
    Write("  <li class='top'><a href='index.php?m=info' id='info' class='top_link'><span class='down'>Information</span></a>");
    Write("    <ul class='sub'>");
    Write("      <li><a href='index.php?m=info&submode=n'>News</a></li>");
    Write("      <li><a href='index.php?m=info&submode=e'>Events</a></li>");
    Write("      <li><a href='index.php?m=info&submode=m'>Minutes</a></li>");
    Write("    </ul>");
    break;
  }
}
$subsql = $pdo->query("SELECT * FROM categories WHERE visible = 1 ORDER BY sortindex,category"); 
while ($catrow = $subsql->fetch(PDO::FETCH_ASSOC)) Write("Cat: {$catrow["category"]}<br/>");

当我运行时，第一个循环运行，然后我得到类别列表。我知道我无法通过Stack Overflow来解决我的服务器故障，但如果有人知道什么样的配置调整或其他问题会导致这种行为，我会非常感谢任何提示：）

Answer 1

未完全提取的语句可能会阻止其他语句实际发生（因此$subsql不是有效的PDO对象）。这可能有用：

$rows = $pdo->query("SELECT pageid FROM webpages WHERE ISNULL(deleted) ORDER BY sortindex")->fetchAll(PDO::FETCH_ASSOC); 
foreach ($rows as $row) {
  switch ($row["pageid"]) {
  case "information":
    Write("  <li class='top'><a href='index.php?m=info' id='info' class='top_link'><span class='down'>Information</span></a>");
    Write("    <ul class='sub'>");
    Write("      <li><a href='index.php?m=info&submode=n'>News</a></li>");
    Write("      <li><a href='index.php?m=info&submode=e'>Events</a></li>");
    Write("      <li><a href='index.php?m=info&submode=m'>Minutes</a></li>");
    $subsql = $pdo->query("SELECT * FROM categories WHERE visible = 1 ORDER BY sortindex,category"); 
    while ($catrow = $subsql->fetch(PDO::FETCH_ASSOC)) Write("      <li><a href='index.php?m=info&cat={$catrow["cid"]}'>{$catrow["category"]}</a></li>");
    Write("    </ul>");
    break;
  }
}

嵌套的PDO查询失败？

1 个答案: