Creating multiple SQL Data from For-loop - php

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.

Answer 2

Create the values array in the for loop, then use implode to build the query outside the loop.
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "myTable";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_errno) {
die("Connection failed: " . $conn->connect_error);
}
$sql = "INSERT INTO data (x, y) VALUES ";
$values = [];
for ($i = 0; $i <= 100; $i++){
$x = rand(0,20);
$y = rand(0,200);
$values[] = "($x, $y)";
}
$query = $sql . implode(",", $values) . ";";
$r = $conn->query($query);
if ($r) {
echo "New records created successfully";
} else {
echo "Error: " . $query . "<br>" . $conn->connect_error;
}
$conn->close();

Answer 3

You are just running a single query for each loop. No need for multi query
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 (mysqli_query($conn,$sql)) {
echo "New records created successfully";
} else {
echo "Error: " . $sql . "<br>" . $conn->error;
}
}