<?php
namespace Illuminate\Database\Connectors;
use PDO;
// this is mysql connection class
class MySqlConnector extends Connector implements ConnectorInterface
{// extends adn implements make class become more powerful
// this is mysql connection
/**
* Establish a database connection.
*
* @param array $config
* @return \PDO
*/
public function connect(array $config)
{// Establish a database connection
$dsn = $this->getDsn($config);// first to get the dsn string
$options = $this->getOptions($config);// second ,get the options
// We need to grab the PDO options that should be used while making the brand
// new connection instance. The PDO options control various aspects of the
// connection's behavior, and some might be specified by the developers.
$connection = $this->createConnection($dsn, $config, $options);
// we need to grab the pdo options that should be bused while making the brand new connection instance.
// The PDO options control various aspects of connections's behavior,and some might be specified by the developers.
if (isset($config['unix_socket'])) {
$connection->exec("use `{$config['database']}`;");
}// set the unix_socket
$collation = $config['collation'];//set the collation
// Next we will set the "names" and "collation" on the clients connections so
// a correct character set will be used by this client. The collation also
// is set on the server but needs to be set here on this client objects.
$charset = $config['charset'];
// Next we will set the "names" and "collation" on the clients connections so a correct char
$names = "set names '$charset'".
(! is_null($collation) ? " collate '$collation'" : '');
$connection->prepare($names)->execute();
// Next, we will check to see if a timezone has been specified in this config
// and if it has we will issue a statement to modify the timezone with the
// database. Setting this DB timezone is an optional configuration item.
if (isset($config['timezone'])) {
$connection->prepare(
'set time_zone="'.$config['timezone'].'"'
)->execute();
}// database name charset and timezone
$this->setModes($connection, $config);// set the mode
return $connection;
}// just return the connection
/**
* Create a DSN string from a configuration.
*
* Chooses socket or host/port based on the 'unix_socket' config value.
*
* @param array $config
* @return string
*/
protected function getDsn(array $config)
{
return $this->configHasSocket($config) ? $this->getSocketDsn($config) : $this->getHostDsn($config);
}// create a dsn string from a configuration
/**
* Determine if the given configuration array has a UNIX socket value.
*
* @param array $config
* @return bool
*/
protected function configHasSocket(array $config)
{
return isset($config['unix_socket']) && ! empty($config['unix_socket']);
}
/**
* Get the DSN string for a socket configuration.
*
* @param array $config
* @return string
*/
protected function getSocketDsn(array $config)
{
return "mysql:unix_socket={$config['unix_socket']};dbname={$config['database']}";
}
/**
* Get the DSN string for a host / port configuration.
*
* @param array $config
* @return string
*/
protected function getHostDsn(array $config)
{
extract($config, EXTR_SKIP);
return isset($port)
? "mysql:host={$host};port={$port};dbname={$database}"
: "mysql:host={$host};dbname={$database}";
}
/**
* Set the modes for the connection.
*
* @param \PDO $connection
* @param array $config
* @return void
*/
protected function setModes(PDO $connection, array $config)
{// set te session sql_mode in this hash mode
if (isset($config['modes'])) {
$modes = implode(',', $config['modes']);
$connection->prepare("set session sql_mode='".$modes."'")->execute();
} elseif (isset($config['strict'])) {
if ($config['strict']) {
$connection->prepare("set session sql_mode='ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION'")->execute();
} else {
$connection->prepare("set session sql_mode='NO_ENGINE_SUBSTITUTION'")->execute();
}
}
}
}