PHP connect to MySQL
PHP Tutorial » PHP connect to MySQL
PHP has three different ways to connect and interact with the MySQL database:
- Original MySQL (with functions),
- MySQL Improved MySQLi,(the "i" stands for improved)
- PDO - PHP Data Objects (PDO, object-oriented)
Which methods are more advantageous to MySQLi or PDO?
The difference between MySQLi and PDO
Each, MySQLi and PDO have their advantages:
The PDO will work on many more database systems, will work on 12 different database systems, while MySQLi will only work with MySQL databases.
Both are object-oriented, but MySQLi also offers a procedural API.
Both PDO and MySQLi support Prepared Statements witch protect against SQL injection and are very important for web application security.
- MySQLi (object oriented)
- MySQLi (procedural)
- PDO
MySQL connect using MySQLi Object-Oriented
Before accessing data from the MySQL database, we must be able to connect to the server:
<?php
/* Attempt MySQL server connection. Assuming you are running MySQL
server with default setting (user, root, your_password, database name) */
$link = new mysqli("localhost", "root", "your_password", "DB_name");
// Check connection
if($link === false){
die("ERROR: Could not connect. " . $link->connect_error);
}
// Print host information
echo "Connect Successfully. Host info: " . $link->host_info;<br />// your code here
// Close the Connection to DataBase
$link->close();
?>
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MySQL connect using MySQLi Procedural.
Attempt MySQL server connection. Assuming you are running MySQL server with default setting ("localhost", "root", "your_password", "DB_name")
<?php
/* Attempt MySQL server connection. Assuming you are running MySQL
server with default setting ("localhost", "root", "your_password", "DB_name") */
$link = mysqli_connect("localhost", "root", "your_password", "DB_name");// Check connection
if($link === false){
die("ERROR: Could not connect. " . mysqli_connect_error());
}
// Print host information
echo "Connected successfully";// your code here
// Close the Connection to DataBase
mysqli_close($link);
?>
MySQL connect using PDO extension.
PDO extension. Attempt MySQL server connection. Assuming you are running MySQL server with default setting ("localhost", "root", "your_password")
<?php
/* /* Attempt MySQL server connection. Assuming you are running MySQL
server with default setting ("localhost", "root", "your_password")
*/
try{$pdo = new PDO("mysql:host=$servername;dbname=myDB", $username, $password);
// Set the PDO error mode to exception
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// Print host information
echo "Connected successfully";
} catch(PDOException $e) {
echo "Connection failed: " . $e->getMessage();
}
// your code here
// Close the Connection
$pdo = null;
?>
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php mysql connect: to database, error, port, function, timeout, db, test, string, pdo, object oriented
PHP connect to MySQLi - php tutorial
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