如何统计查询结果的所有行出现次数

Question

我不确定我是否做错了或没有包括我应该做的事情，但我正在使用 rowCount() 来尝试计算数据库中的所有行以获取查询结果，如下所示： $count_total_friend = $friend_stmt->rowCount();。结果显示 6 而它应该只有 2。它似乎在计算我数据库中的所有行，而不是我的查询结果。

我做错了什么？

    $friend_status = 2;
    $friend_sql = "
        SELECT *
        FROM friends
        WHERE friend_one or friend_two = ?
        AND status = ?
    ";
    $friend_stmt = $con->prepare($friend_sql);
    $friend_stmt->execute(array($user_id, $friend_status));
    $friend_total_rows = $friend_stmt->fetchAll(PDO::FETCH_ASSOC);
    $count_total_friend = $friend_stmt->rowCount();
    foreach ($friend_total_rows as $friend_total_row) {
        //$select_friend_1  = $friend_total_row['friend_one'];
        //$select_friend_2  = $friend_total_row['friend_two'];
        //$friend_status        = $friend_total_row['status'];
        //$friend_status_date = $friend_total_row['date'];
    }

Answer 1

您的查询有问题

    SELECT *
    FROM friends
    WHERE friend_one or friend_two = ?
    AND status = ?

应该是这样的

    SELECT *
    FROM friends
    WHERE (friend_one = ? or friend_two = ?)
    AND status = ?

当然你需要绑定正确的参数

如何统计查询结果的所有行出现次数

How to count all row occurrences of query results

php

mysql

pdo

rowcount