PDO 返回 0 而不是 rowcount答案

【问题标题】：PDO returns 0 instead of rowcountPDO 返回 0 而不是 rowcount
【发布时间】：2014-05-17 00:26:37
【问题描述】：

只有第一条 SQL 语句返回有效结果。其他人返回0。我不知道为什么。我究竟做错了什么？代码如下：

$year = htmlspecialchars($_POST['year']);
$ukupan_broj_servisa="SELECT COUNT(*) FROM services WHERE date BETWEEN '$year-01-01' AND '$year-12-31'";
$ukupan_broj_malih_servisa="SELECT COUNT(*) FROM services WHERE service_mali > '' AND date BETWEEN '$year-01-01' AND '$year-12-31'";
$ukupan_broj_velikih_servisa="SELECT COUNT(*) FROM services WHERE service_veliki > '' AND date BETWEEN '$year-01-01' AND '$year-12-31'";
$ukupan_broj_kola="SELECT COUNT(*) FROM cars";
$stmtser = $pdo->prepare($ukupan_broj_servisa);
$stmtmali = $pdo->prepare($ukupan_broj_malih_servisa);
$stmtveliki = $pdo->prepare($ukupan_broj_velikih_servisa);
$stmtkola = $pdo->prepare($ukupan_broj_kola);
try {
    $stmtser->execute();
    $stmtmali->execute();
    $stmtveliki->execute();
    $stmtkola->execute();
} catch (PDOException $e) {
    echo "Došlo je do greške u bazi podataka. Molimo pokušajte kasnije ili kontaktirajte administratora.";
    echo $e;
    exit();
}
echo '
    <label id="brojvozila">'.$stmtkola->fetchColumn(0).'</label>
    <label id="brojservisa">'.$stmtser->fetchColumn(0).'</label>
    <label id="brojmalihservisa">'.$stmtmali->fetchColumn(0).'</label>
    <label id="brojvelikihservisa">'.$stmtveliki->fetchColumn(0).'</label>
';

【问题讨论】：

如果连接查询字符串中的值，则使用准备好的语句毫无意义。这不是准备好的语句的用途。
这并不能解决我的问题。我用 $pdo->query() 替换它，同样的事情发生了。

标签： php pdo rowcount

【解决方案1】：

我找到了解决方案。我重新安装了 MySQL 服务器，它工作正常。

【讨论】：