php - 显示随机 mysql 记录 - PHP

Question

我试图从我的表中显示随机记录，但没有运气，这就是我要做的。这是用 PHP 编码的

$range_result = mysql_query("SELECT MAX() AS max_id , MIN() AS min_id FROM pages");
$range_row = mysql_fetch_object( $range_result ); 
$random = mt_rand($range_row->min_id , $range_row->max_id);
$result_random = mysql_query( "SELECT * FROM pages WHERE id >= $random LIMIT 0,1");
echo $result_random;

想知道这是否是一个明显的错误？我已经连接到数据库了。

JB

Answer 1

为了提高性能，您应该使用带有 mysqli_multi_query 的直接 SQL 来执行此操作:

// First query gets the random ID, second gets the associated row
$sql = "SELECT @id:=FLOOR(RAND()*(MAX(id) - MIN(id))) + MIN(id) FROM pages; 
        SELECT * FROM pages WHERE id = @id;"

// Create a mysqli object and execute the multi-query
$mysqli = new mysqli($host, $user, $pass, $db_name);
$mysqli->multi_query($sql);
$result = $mysqli->store_result();

// Grab the first row from the first resultset
if ($row = $result->fetch_assoc()) {
    print_r($row);
}