I am creating an install php script that creates some tables in a database and creates a config file. Everything works but I don't know how to check if their host, username and password are correct. I currently check if the database is there or not.. any help would be appreciated. This is on a WAMP server using PHP 5.4.12. The variables come from a basic form.
session_start();
$_SESSION['dbdatabase'] = $_POST['dbdatabase'];
$_SESSION['dbhost'] = $_POST['dbhost'];
$_SESSION['dbusername'] = $_POST['dbusername'];
$_SESSION['dbpassword'] = $_POST['dbpassword'];
$conn=mysqli_connect($_SESSION['dbhost'],$_SESSION['dbusername'],$_SESSION['dbpassword']);
if(!mysqli_select_db($conn, $_SESSION['dbdatabase']))
{
die ('Database does not exists. Please create a database before installing Pazzilla BackOffice.');
}
else
{
The function you are looking for is mysqli_connect_error().
<?php
$link = mysqli_connect('localhost', 'invalid_user', 'password');
if (!$link) {
die('Invalid database credentials. Mysql said: ' . mysqli_connect_error());
}
?>
Related
I creat a database in cpanel and write small php code.
<?php
$dbhost='localhost';
$dbuser='-------';
$dbpass='*******';
$db = mysql_connect($dbhost,$dbuser,$dbpass);
mysql_set_charset('utf8',$db);
if(!$db){
echo 'can not connect to server';
}
else{
$database = '--------_ps';
$select = mysql_select_db($database);
if($select){
echo 'database selected. <br/>';
}
else{
echo 'database not select. <br/>';
}
mysql_close($db);
}
?>
I see database not select, When I change --------_ps database to phpmyadmin data base 'Database operations
information_schema' echo database selected.
I am not beginner on php but I don't know any way to solve this.
Please help me.
Try this code -witch also provides some basic feedback as to what errors your script may encounter:
<?php
...
$conn = #mysql_connect($dbhost, $dbuser, $dbpass) or die("Could not connect to the Database Server");
mysql_set_charset('utf8', $conn );
mysql_select_db($database, $conn) or die("Could not find the Database");
...
?>
Now, the above script works. If you still encounter problems, can you please give some feedback with the error log of your web server?
One more thing: Make sure you have created the database correctly with the phpMyAdmin, AND also have set the user with the credentials you are using...
if (!empty($_POST)) {
$host = $_POST['host'];
$user = $_POST['user'];
$pass = $_POST['pass'];
$db = $_POST['db'];
echo '<pre>';
print_r($_POST);
$con = #mysqli_connect($host . ":3360", $user, $pass, $db);
// $con=#mysqli_connect('192.168.100.42','root','vertrigo','skates');
// Check connection
if (mysqli_connect_errno()) {
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
else {
echo 'connected';
}
#mysqli_close($con);
}
I'm using this script to access remote db server in local(basically i want to access local db server through live webiste), howewer, I'm getting an error:
Failed to connect to MySQL: Unknown MySQL server host
'192.168.100.42:3360' (11004)
Please help to get out from this.
192.168.100.42 looks like a local IP. You'd need to try to connect to your static public IP and then forward port 3306 in your router to the 192.168.100.42 machine.
That's not your only problem;
Just because $_POST is not empty, don't assume it has those array keys set and not empty. Syntax like
if(isset($_POST['user'] && !empty($_POST['user'])))
Is much better.
Also, never use $_POST on any database interaction without sanitisation, and never connect to a database with the root user.
I don't know your exact application, but it's impossibly insecure.
I am new to programming. I have a website on iPage. Now, I am learning PHP and one of the things I am learning is to connect PHP to mySql database. I am using the following:
mysql_connect(host name, username, password)
My question is, why I am not getting an error?
no matter what username and password and even host name i enter, it just accepts it!
This is the code I am trying (the username and password are just as example)
<?php
mysql_connect('ipage','admin','password');
echo 'Connected!';
?>
when I run it, it just says connected even though my username and password are not admin, password.
Use mysqli_*, beacuse mysql_* is deprecated and will be removed in the future:
$conn = mysqli_connect('localhost', 'username', 'password');
if(mysqli_connect_errno($conn))
{
die('Error in connection to MySQL: ' . mysqli_connect_error());
}
else
{
echo 'Connected successfully';
}
You are not checking if you are connected.
You need to use something like this:
$link = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
echo 'Connected successfully';
mysql_close($link);
My suggestion is to start reading some docs, they have some great examples and you can really learn a lot. DOCUMENTATION
I'm trying to create a database if it does not exist. Code is here:
<?php
// Connect to MySQL
$link = mysql_connect('host', 'user', 'pw');
if (!$link) {
die('Could not connect: ' . mysql_error());
}
// Make studentdb the current database
$db_selected = mysql_select_db('StudentDB', $link);
if (!$db_selected) {
// If we couldn't, then it either doesn't exist, or we can't see it.
$sql = 'CREATE DATABASE StudentDB';
if (mysql_query($sql, $link)) {
echo "Database StudentDB created successfully\n";
} else {
echo 'Error creating database: ' . mysql_error() . "\n";
}
}
mysql_close($link);
?>
I'm getting this error:
Error creating database: Access denied for user 'myusernamehere' to database 'StudentDB'
the user has dba permissions...I'm guessing this is a permission error for my user....how can I give the user permission through the script and make this script work?
the users you are trying to use have no priviledges to use CREATE
try to switch to another user that have all the priviledges needed on manipulting the database or
add the needed priviledges to the user you are using
it happend to me and the following solved the problem:
first before using code to editing the database go to the main
localhost/index.php page then choose phpMyAdmin database manager
after than make sure that you are loged in as admin
I'm trying to connect to a mysql database with php and myadmin. I've tried a lot of codes I could find online, but I just can't put this thing to work...
Can anyone please tell me what I might be doing wrong?
this is the php script I am using:
<?php
$useremail = $_POST["useremail"];
$password = $_POST["password"];
if($useremail && $password){
// open database
$connect = mysql_connect("localhost", "carlos", "nenem");
if(!$connect){
die ("Not able to connected to the database: " .mysql_error());
}
// select database
$select_db = mysql_select_db("vergilioDB", $connect);
if(!$connect_db){
die("Not able to connect to the database: " .mysql_error());
}
mysql_close($connect);
} else {
die("Please enter useremail and password, or REGISTER if you are a new user!");
}
?>
Carefull, $select_db != $connect_db
The variable names are different, rewrite to:
$select_db = mysql_select_db("vergilioDB", $connect);
if(!$select_db){
die("Not able to connect to the database: " .mysql_error());
}
note that you are closing your MySQL connection regardless of anything else before you ever use it for anything..
mysql_close($connect);
You likely want to separate your connection logic from your login logic. You likely need the DB connection to validate the password no matter what and your DB connection should be the first thing you do to make sure you can even DO anything with a given page...