How to tell which query had an error? [duplicate] - php

Question

This question already has answers here:
Why does this PDO statement silently fail?
(2 answers)
Closed 5 years ago.
I am trying to convert my mysqli database that was very vulnerable to PDO prepared statements. I think i almost got it since it actully inputs the registration data to the database but not to the other databases. So i think there must be some issues on those queries but i can't figure it out. Here below is my code.
<?php
session_start();
// DATABASE CONNECTION
$user = '****';
$pass = '****';
//CREATE CONNECTION
// $conn = new mysqli($dbserver, $dbusername, $dbpassword, $db);
$pdo = new PDO('mysql:host=localhost;dbname=****', $user, $pass);
// ASSIGN VARIABLE FROM FORM
$username = $_POST['username'];
$password = $_POST['password'];
$email = $_POST['email'];
$password = password_hash($password, PASSWORD_BCRYPT);
// CHECK IF USER IS UNIQUE
$stmt = $pdo->prepare("SELECT username FROM users WHERE username = :name");
$stmt->bindParam(':name', $username);
$stmt->execute();
if ($stmt->rowCount() > 0) {
echo "That username already exist!";
} else {
//INSERT DATA INTO DATABASE
$sql = "INSERT INTO users ( username, password, email )
VALUES ( :username, :password, :email )";
$sql1 = "INSERT INTO stats (id, username)
VALUES ((SELECT id FROM users WHERE username=':username'), (SELECT username FROM users WHERE username=':username'))";
$sql2 = "INSERT INTO progression (id, username)
VALUES ((SELECT id FROM users WHERE username=':username'), (SELECT username FROM users WHERE username=':username'))";
$sql3 = "INSERT INTO powervalues (id, username)
VALUES ((SELECT id FROM users WHERE username=':username'), (SELECT username FROM users WHERE username=':username'))";
// EXECUTE AND PREPARE
$query = $pdo->prepare($sql);
$query1 = $pdo->prepare($sql1);
$query2 = $pdo->prepare($sql2);
$query3 = $pdo->prepare($sql3);
$result = $query->execute(array( ':username'=>$username, ':password'=>$password, ':email'=>$email ));
$result1 = $query1->execute(array( ':username'=>$username ));
$result2 = $query2->execute(array( ':username'=>$username ));
$result3 = $query3->execute(array( ':username'=>$username ));
//EXECUTE QUERY
if ($result && $result1 && $result2 && $result3) {
$_SESSION['Accountsucess'] = "Account has been added sucessfully.";
header("location: ../../index.php?page=index");
} else {
echo "Error database failure";
}
}

Answer 1

Instead of continually selecting various parts of information, once you have inserted the user in the users table, fetch the last insert ID and then use that in subsequent calls...
$sql = "INSERT INTO users ( username, password, email )
VALUES ( :username, :password, :email )";
$sql1 = "INSERT INTO stats (id, username)
VALUES (:id,:username)";
// EXECUTE AND PREPARE
$query = $pdo->prepare($sql);
$query1 = $pdo->prepare($sql1);
$result = $query->execute(array( ':username'=>$username, ':password'=>$password, ':email'=>$email ));
// Fetch id of new user
$id = $pdo->lastInsertId();
$result1 = $query1->execute(array( ':id' => $id, ':username'=>$username ));
Repeat this same logic for each of the other statements.