CODEWITHSUNDEEP
mysqlsqldatabase
Marcin
Marcin

Reputation: 220

Check if email already exists in database and add/change data

I've got a form which has 14 numeric inputs and 2 text inputs - name and email. Someone is adding data and it's saved to the database - I've done it. But when someone is adding data for the second time using the same email address, database should override the data in specific row with that email.

I read about UPDATE in sql but I don't know how to make a query which will check if that email exists and after that add or update data.

<?php
$servername = "localhost";
$username = "username";
$password = "pass";
$dbname = "test";
$quantity = $_POST['quantity'];
$quantity2 = $_POST['quantity2'];
$quantity3 = $_POST['quantity3'];
$quantity4 = $_POST['quantity4'];
$quantity5 = $_POST['quantity5'];
$quantity6 = $_POST['quantity6'];
$quantity7 = $_POST['quantity7'];
$quantity8 = $_POST['quantity8'];
$quantity9 = $_POST['quantity9'];
$quantity10 = $_POST['quantity10'];
$quantity11 = $_POST['quantity11'];
$quantity12 = $_POST['quantity12'];
$quantity13 = $_POST['quantity13'];
$quantity14 = $_POST['quantity14'];
$name = $_POST['name'];
$email = $_POST['email'];

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "INSERT INTO Results (1paracwierc, 1paracwierc2, 2paracwierc, 2paracwierc2, 3paracwierc, 3paracwierc2, 4paracwierc, 4paracwierc2, 1parapol, 1parapol2, 2parapol, 2parapol2, final, final2, name, email)
VALUES ($quantity, $quantity2, $quantity3, $quantity4, $quantity5, $quantity6, $quantity7, $quantity8, $quantity9, $quantity10, $quantity11, $quantity12, $quantity13, $quantity14, '$name', '$email')";

if ($conn->query($sql) === TRUE) {
    echo "Saved.";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>

Upvotes: 0

Views: 1161

Answers (1)

Gordon Linoff
Gordon Linoff

Reputation: 1270463

Use insert . . . on duplicate key update. You can do this if you have a unique key on what you want to be unique:

create unique index idx_results_name_email (name, email);

Then, the database will enforce uniqueness. The statement you want is:

INSERT INTO Results (1paracwierc, 1paracwierc2, 2paracwierc, 2paracwierc2, 3paracwierc, 3paracwierc2, 4paracwierc, 4paracwierc2, 1parapol, 1parapol2, 2parapol, 2parapol2, final, final2, name, email)
    VALUES ($quantity, $quantity2, $quantity3, $quantity4, $quantity5, $quantity6, $quantity7, $quantity8, $quantity9, $quantity10, $quantity11, $quantity12, $quantity13, $quantity14, '$name', '$email')
    ON DUPLICATE KEY UPDATE 1paracwierc = VALUES(1paracwierc),
                            1paracwierc2 = VALUES(1paracwierc2),
                             . . .
                            final2 = VALUES(final2);

Upvotes: 4

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