我试图从数据库中的表返回行计数,但仍然得到错误的值。我需要行计数来处理分页的子集值。我的表中有 11 项,但我只返回 1 项并且不明白为什么:(
我的外部连接文件:
try {
$pdo = new PDO('mysql:host=localhost;dbname=name', 'admin', 'password');
} catch (PDOException $e) {
exit('Database error.');
}
我的文章类:
class Article {
public function fetch_all_articles($start, $max) {
global $pdo;
$query = $pdo->prepare("SELECT * FROM articles ORDER BY article_timestamp DESC LIMIT $start, $max");
$query->execute();
$articles = $query->fetchAll();
$query->closeCursor();
return $articles;
}
public function fetch_num_rows() {
global $pdo;
$query = $pdo->prepare("SELECT COUNT(*) FROM articles");
$query->execute();
$rowCount = $query->rowCount();
$query->closeCursor();
return $rowCount;
}
}
还有我的index.php 文件:
$maxArticles = 4; //Show only 4 articles per page
$page = $_GET['page'] ? $_GET['page'] : 0; //Get current page number or assign $page = 0 if no page number exists
$startRow = $page * $maxArticles; //Get current article subset value
$article = new Article;
$articles = $article->fetch_all_articles($startRow, $maxArticles); //articles array
$numArticles = $article->fetch_num_rows(); //number of articles
$rowCount = $article->fetch_num_rows(); //number of articles
echo $rowCount;
echo $numArticles;
是的,我确实需要 $rowCount 和 $numArticles,它们用于两个不同的目的。
有人可以帮助我吗?
最佳答案
你应该更换
$rowCount = $query->rowCount();
与
$rowCount = $query->fetchColumn();
另外,看看FOUND_ROWS()
调用 fetch_num_rows 2 次是没有意义的,这样做就足够了:
$numArticles = $rowCount = $article->fetch_num_rows();
关于php - 无法使用 php pdo 从数据库返回正确的行数,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19919265/