mySQL中的php自动递增ID与存储的不同[关闭]

Question

So on my web page i have a database connection setup. Once a user posts a comment on the web page it adds the comment to the database and a column in the database called ID gets incremented by 1. This ID serves as the primary key for the each row in the database. So when the user wants to remove a comment it checks the database for the comment that has matching primary key.

My current solution is this.

add the comment to the database

the database adds the ID

get the ID from the database

store it together with the comment in an array

When a user clicks delete comment check if the comment ID matches the ID in the database.

My problem with this is that it feels weird calling the database to add the comment and then call the database again to get the comment ID.

Is there any better solution to this?

Answer 1

Below I've added some code based on your question. Let's say you've a table called comments where you're inserting some values and as the id is an auto incremented field so it is inserted automatically with your passed data. So if you try with php and mysql then after your insert operation you can easily get the last inserted id without doing another extra query for inserted id using $conn->insert_id

$sql = "INSERT INTO comments(commenter, comment)
VALUES ('John', 'How are you?')";

if ($conn->query($sql) === TRUE) {
    $last_id = $conn->insert_id;
    echo "New record created successfully. Last inserted ID is: " . $last_id;
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

REF.: http://php.net/manual/en/mysqli.insert-id.php