从For循环创建多个SQL数据

Question

I am trying to add random x and y values to a MySQL database but strangely it only seems to ever add one value. I was looking at many of the other posts of similar issues on Stackoverflow and it just seemed they did not have query within the loop was the common issue. I do have the query in the loop and am unsure why it is still not working.

Please see my code below:

<?php 
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myTable";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 
for ($i = 0; $i <= 100; $i++){
    $x = rand(0,20);
    $y = rand(0,200);
    $sql = "INSERT INTO data (x, y)"
    $sql .= "VALUES ($x, $y);";
    //mysql_query($sql);

    if ($conn->multi_query($sql) === TRUE) {
        echo "New records created successfully";
    } else {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }
}

$conn->close();
?>

Answer 1

I edited your for loop to look something like this, and it worked perfectly fine for me.

for ($i = 0; $i <= 100; $i++){
    $x = rand(0,20);
    $y = rand(0,200);
    $sql = "INSERT INTO data (x, y) VALUES ('$x', '$y')";
    $result = mysqli_query($conn, $sql);
    if($result)
    {
        echo "Successfully created record " . $i;
    } else
    {
        echo "Error: " . $sql . "<br>" . $conn->error;
    }
    ob_start();
    ob_flush();
    flush();
    usleep(001000);
    ob_flush();
    flush();
}

it Delay's the loop by just a little like a fifth of a second in total. The reason I have delayed the iteration is because your database might have a limit on how many queries can be sent within a time frame. It works for me let me know if it works for you.