How do I do two MYSQLI queries in one page, what is the best method

问题

All right. I'm learning about the mysqli API. I've got two files. One that connects to my database, and one that runs the query. Everything works. However, I want to run two queries in a single page. How can I do this? What is a good method to do this? Would the best way be to include my db connect once, then run both queries, and then close my connection to my db once ending it all together? Is that how most people do it?

db.php

$mysqli = new mysqli("..", "..", "..", "..");

/* check connection */
if ($mysqli->connect_errno) {
    printf("Connect failed: %s\n", $mysqli->connect_error);
    exit();
}

query.php

include 'db.php';

$sql = "SELECT id, row1 FROM test ORDER by id DESC";

$query = $mysqli->query($sql) or die(mysqli_error());
$row_cnt = mysqli_num_rows($query);

if ($row_cnt  > 0) {

    while ($row = $query->fetch_assoc()) {
        echo $row["id"] . $row["row1"];
    }

    $result->free();
}

$mysqli->close($mysqli);

回答1:

http://php.net/manual/en/mysqli.multi-query.php Is an option depending on what you want to achieve

Alternatively, you said

The second query is from the same table but it'll use a * to get all rows.

Ignore me if your code is just an example, but two consecutive select queries from the same table is 'often' not needed, you're getting "id" and "row1" from the *. So you could have one query that gets * in the first place.

来源：https://stackoverflow.com/questions/18048093/how-do-i-do-two-mysqli-queries-in-one-page-what-is-the-best-method

标签

php

mysqli

while-loop