I am trying to connect to MySQL with PHP but i keep getting the following error: "mysqli::__construct(): (HY000/2002): No such file or directory in /Users/markjonathas/Documents/bar/database_connection.php on line 9" I have MAMP downloaded and I am using PHP 7.3.1 and MySQL version 8.0.16.
I have tried to to download Sequel Pro but when I try to connect to the database I get the following error: "MySQL said: Authentication plugin 'caching_sha2_password' cannot be loaded: dlopen(/usr/local/lib/plugin/caching_sha2_password.so, 2): image not found"
//code for database_connection.php:
<?php
$servername = "127.0.0.1:3306";
$username = "root";
$password = "-------";
$database = "barDB";
function db_connect() {
$connection = new mysqli($servername, $username, $password,
$database);
return $connection;
}
function db_disconenct() {
if(isset($connection)) {
$connection->close();
}
}
?>
//code for connecting to database_connection.php:
<?php
require_once("database_connection.php");
$db = db_connect();
?>
Create a file and name it as init.php or whatever you want.
<?php
$db_name = "barDB";
$mysql_user = "root";
$mysql_pass = "-------";
$server_name = "127.0.0.1:3306";
$con = mysqli_connect($server_name, $mysql_user, $mysql_pass, $db_name);
if(!$con){
echo "Server Error";
}else{
}
?>
To access global variables, you have to declare them as global:
function db_connect() {
global $connection, $servername, $username, $password, $database; // <<<<<<<<
$connection = new mysqli($servername, $username, $password, $database);
return $connection;
}
function db_disconenct() {
global $connection; // <<<<<
if(isset($connection)) {
$connection->close();
}
}
Read PHP documentation for details.
Related
I'm working on streamlining a bit our db helpers and utilities and I see that each of our functions such as for example findAllUsers(){....} or findCustomerById($id) {...} have their own connection details for example :
function findAllUsers() {
$srv = 'xx.xx.xx.xx';
$usr = 'username';
$pwd = 'password';
$db = 'database';
$port = 3306;
$con = new mysqli($srv, $usr, $pwd, $db, $port);
if ($con->connect_error) {
die("Connection to DB failed: " . $con->connect_error);
} else {
sql = "SELECT * FROM customers..."
.....
.....
}
}
and so on for each helper/function. SO I thought about using a function that returns the connection object such as :
function dbConnection ($env = null) {
$srv = 'xx.xx.xx.xx';
$usr = 'username';
$pwd = 'password';
$db = 'database';
$port = 3306;
$con = new mysqli($srv, $usr, $pwd, $db, $port);
if ($con->connect_error) {
return false;
} else {
return $con;
}
}
Then I could just do
function findAllUsers() {
$con = dbConnection();
if ($con === false) {
echo "db connection error";
} else {
$sql = "SELECT ....
...
}
Is there any advantages at using a function like this compared to a Class system such as $con = new dbConnection() ?
You should open the connection only once. Once you realize that you only need to open the connection once, your function dbConnection becomes useless. You can instantiate the mysqli class at the start of your script and then pass it as an argument to all your functions/classes.
The connection is always the same three lines:
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$con = new mysqli($srv, $usr, $pwd, $db, $port);
$con->set_charset('utf8mb4');
Then simply pass it as an argument and do not perform any more checks with if statements.
function findAllUsers(\mysqli $con) {
$sql = "SELECT ....";
$stmt = $con->prepare($sql);
/* ... */
}
It looks like your code was some sort of spaghetti code. I would therefore strongly recommend to rewrite it and use OOP with PSR-4.
I'm trying to connect to mysql db in phpstorm, but I don't succeed.
I will appreciate your help.
<?php
$servername = "http://localhost:8012";
$username = "root";
$password = "";
// Create connection
$conn = new mysqli($servername, $username, $password);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}else{
die("Connected successfully");
}
The error is:502 Bad Gateway
You can connect database like that:
<?php
$servername = "localhost";
$username = "root";
$password = "";
$database = "";
$port = "8012";
// Create connection
$conn = new mysqli($servername, $username, $password, $database, $port);
// Check connection
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}else{
die("Connected successfully");
}
<?php
$servername = "localhost:8012";
$username = "root";
$password = "";
$database = "dbname";
// Create connection
$conn = mysqli_connect($servername, $username, $password,$database) or die(mysqli_error($conn);
echo "Connection Successful";
Old connection method mysql_connect maybe deprecated from PHP7 so what is the best way to connect and query in mysql using XAMPP or how I implement PDO in my bellow script.
<?php
$key = $_GET['key'];
$array = array();
$con = mysql_connect("localhost", "root", "");
$db = mysql_select_db("search", $con);
$query = mysql_query("select * from ajax_example where name LIKE '%{$key}%'");
while ($row = mysql_fetch_assoc($query)) {
$array[] = $row['name'];
}
echo json_encode($array);
?>
Database connection using mysqli_* :
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$database = "database";
// Create connection
$conn = mysqli_connect($servername, $username, $password, $database);
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
echo "Connected successfully";
?>
For further mysqli_* statement syntax refer: Mysqli_* Manual
Database connection using PDO_* :
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$database = "database";
try {
$conn = new PDO("mysql:host=$servername;dbname=$database", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "Connected successfully";
}
catch(PDOException $e)
{
echo "Connection failed: " . $e->getMessage();
}
?>
For further PDO_* statement syntax refer PDO_* Manual
$conn = new Connection();
$query = "select * from ajax_example where name LIKE '%{$key}%'";
$res = $conn->execute_query($query)->fetchall(PDO::FETCH_ASSOC);
if (!empty($res))
{
$result['data'] = $res;
echo json_encode($result);
}
this is my first php code , i am trying to connect to a database with user name = "root" and password = "root"
i have a connection file called dbConnection.php
as following :
<?php
echo "in connection file";
$hostname = "localhost";
$username = "root";
$password = "root";
$db = "ledDB";
echo "<br> db-connection : vars definde ";
//connection to the database
$conn = mysql_connect($hostname, $username, $password)
or die("Unable to connect to MySQL");
echo "Connected to MySQL<br>";
echo "db-connection : initilize connection ";
mysql_select_db($db);
echo "db-connection : connection done";
// Check connection
echo "Connected successfully";
?>
and i call it in a file called what.php :
<?php
echo "Hello";
include "dbConnection.php";
echo "ohhhh";
?>
this returns status code 500 which is internal server error
but i want to know what is the error to fix it how can i get the error message ?
i tried
$conn = mysql_connect($hostname, $username, $password)
or die("Unable to connect to MySQL");
but it is not returning any thing.
can any one help me please ?
if you are having password on localhost then use password otherwise leave it blank
$con = mysqli_connect("localhost","root","yourpassword","yourdb");
You mysqli_connect() method.
<?php
echo "in connection file";
$hostname = "localhost";
$username = "root";
$password = "root";
$db = "ledDB";
echo "<br> db-connection : vars definde ";
//connection to the database
$conn = mysqli_connect($hostname, $username, $password)
or die("Unable to connect to MySQL");
echo "Connected to MySQL<br>";
echo "db-connection : initilize connection ";
mysqli_select_db($conn,$db);
echo "db-connection : connection done";
// Check connection
echo "Connected successfully";
?>
First Thing is to Change your connection method to mysqli or my personal favorite PDO.
PDO Example:
class db extends pdo{
//Website Variables
public $sitedb = '';
public $siteconfig;
public $sitesettings = array(
'host' => 'localhost',
'database' => 'yourdb',
'username' => 'youruser',
'password' => 'yourpass',
);
public function __construct(){
$this->sitedb = new PDO(
"mysql:host={$this->sitesettings['host']};" .
"dbname={$this->sitesettings['database']};" .
"charset=utf8",
"{$this->sitesettings['username']}",
"{$this->sitesettings['password']}"
);
$this->sitedb->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE, PDO::FETCH_ASSOC);
}
}
$db = new db();
Then you can extend your PDO class to new classes after including the db.php page.
Example Select:
class yourclass extends db {
public function SelectUsers() {
global $db;
$query = <<<SQL
SELECT email
FROM users
WHERE active = :active
SQL;
$resource = $db->sitedb->prepare( $query );
$resource->execute( array (
':active' => 1,
));
$count = $resource->rowCount();
foreach($resource as $user){
$this->email = $user['email'];
}
}
}
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "mydb";
// Create connection
$conn = mysqli_connect($servername, $username, $password);
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
echo "Connected successfully";
// make the current db
$db_selected = mysqli_select_db ( $conn , $dbname );
if (!$db_selected) {
die ('Can\'t connect to Database : ' . mysql_error());
}
?>
<?php
$host = "localhost";
$username = "root";
$password = "";
$db = "mineforums";
$connect = mysqli_connect($host, $username, $password, $db) or die(mysqli_error($connect));
?>
That is my php code to connect to my database. Whenever I try to just connect though it doesnt do anything. The way I have my login-form setup is the action will be to this code and then doesnt do anything and when I return to my index it says database not selected because if you're logged in it says 'Welcome, {username}'
you could split the process
<?PHP
$host = "localhost";
$username = "root";
$password = "";
$db = "mineforums";
$connect = mysql_connect($host, $username, $password)OR DIE("Could Not Connect To Server". MySQL_Error());
if($connect) {
mysql_select_db($db)OR DIE("Could Not Select Databse". MySQL_Error();
}
?>