Question

我只是想学习准备好的声明，我正在按照PHP手册指导我，我已经检查了有关stackoverflow上这个问题的答案但是，我找不到任何解决方案，$ stmt-＆gt; num_rows总是（返回0）

stackoverflow上有一篇文章讨论了这个问题，他们建议使用 $ stmt-＆gt; store_result（）就在$ stmt-num_rows之前，但$ stmt-＆gt; num_rows返回0

有些人请告诉我这里我做错了什么....我只是厌倦了程序式编码，我想用准备好的声明提高我的技能

这是下面的功能

function get_all()
    {
        // ** Initializing  the Connection
        $mysqli = Connect();
        $sql = ( ' SELECT * FROM `users` ' );
        $stmt = $mysqli->prepare($sql);
        $stmt->execute();
        $res = $stmt->get_result();
        echo $num_count = $stmt->num_rows();
        $user = array();
        for ($counter = 0; $row = $res->fetch_assoc(); $counter++) 
        {
            $user[$counter] = $row;
        }   
        return $user;
    }

//这是第二次更新

function get_all()
    {
        // ** Initializing  the Connection
        $mysqli = Connect();

        $sql = ( ' SELECT * FROM `users` ' );

        $stmt = $mysqli->prepare($sql);

        $stmt->execute();

        $res = $stmt->get_result();

        echo $num_count = $stmt->num_rows;

        $user = array();

        while($row = $res->fetch_assoc()) 
        {
             $user[] = $row;
        }


         return $user;

    }

//第三次更新

function get_alll()
    {

        // ** Initializing  the Connection
        $mysqli = Connect();

        // no need to use * character, 
        // need to write query this way
        $sql = ( ' SELECT `id`,`fname`,`lname`,`uname`,`email` FROM `users` ' );

        $stmt = $mysqli->prepare($sql);
        // here need to use bind param
        $stmt->bind_result( $id, $fname, $lname, $uname, $email);
        $stmt->execute();
        // it's important to store the result 
        // before using num rows    
        $res = $stmt->store_result();

        echo $num_count = $stmt->num_rows;

            // 
        while($stmt->fetch())
        {
            echo $fname;
        }

     }

Answer 1

num_rows是属性，不是方法，请使用不带括号的$stmt->num_rows

$ stmt-num_rows（返回0）

1 个答案: