如何从每行都是记录的文本区域一次将大量记录插入数据库？

Question

I'm running a website aimed for medical students, I have a profile and points for every student in my database, So when they participate in an activity I must add X amount of points for all the participants, and I do this manually using an ajax form, How can I run a MySQL query to give X amount of points for each student in a large text input (textarea)? So I can insert the points all at once which is much easier and faster, Here is an example:

21910431|1|Participant
22010431|3|Subleader
21810531|6|Headleader
(Student ID)|(points)|(role in activity)

So when I fill the textarea with the data above it must insert 3 records into the activity_log table. How can I insert this into the database all at once? Like this:

$query= "INSERT INTO `activity_log` (`Student ID`, `points`, `role`) VALUES (ALL THE VALUES IN THE EXAMPLE ABOVE)";

If anyone can help can you write the code to show me how? Thanks alot!

Answer 1

You can insert multiple rows:

INSERT INTO `activity_log` (`Student ID`, `points`, `role`) VALUES (21910431,1,'Participant'),(22010431,3,'Subleader'),...;

Using placeholders, this would be:

INSERT INTO `activity_log` (?,?,?),(?,?,?),...;

just passing all the values to execute.

Answer 2

Using PDO:

$lines = explode("\n", $_POST['textarea']); // split into lines
$params = [];
foreach ($lines as $line) {
    if ($line) {  // skip blank lines
        $params += explode('|', $line); // split each line into individual values
    }
}
# Make all the (?, ?, ?) that go after VALUES
$values = implode(',', array_fill(0, count($params)/3, '(?, ?, ?)')); 
$query= "INSERT INTO `activity_log` (`Student ID`, `points`, `role`) VALUES $values";
$stmt = $conn->prepare($query);
$stmt->execute($params);