[英]Do I need a php mysql connection in each function that uses database?
I am creating a php restful API and currently I have the database connection information in each function.我正在创建一个 php restful API,目前我在每个函数中都有数据库连接信息。
//Connect To Database
$hostname=host;
$username=username;
$password=password;
$dbname=dbname;
mysql_connect($hostname, $username, $password) OR DIE('Unable to connect to database! Please try again later.');
mysql_select_db($dbname);
mysql_query($sqlApiAccess) or die('Error, insert query failed');
What is the best way of doing this, Can I have one database connection per php file?这样做的最佳方法是什么,我可以为每个 php 文件建立一个数据库连接吗? Or do I need to do it per function that uses the database.
或者我是否需要为每个使用数据库的函数执行此操作。
To avoid creating a new database connection each time, we can use Singleton design pattern -为了避免每次都创建一个新的数据库连接,我们可以使用单例设计模式——
we need to have a database class- to handle the DB connection-我们需要一个数据库类——来处理数据库连接——
Database.class.php数据库.class.php
<?php
class Database
{
// Store the single instance of Database
private static $m_pInstance;
private $db_host='localhost';
private $db_user = 'root';
private $db_pass = '';
private $db_name = 'databasename';
// Private constructor to limit object instantiation to within the class
private function __construct()
{
mysql_connect($this->db_host,$this->db_user,$this->db_pass);
mysql_select_db($this->db_name);
}
// Getter method for creating/returning the single instance of this class
public static function getInstance()
{
if (!self::$m_pInstance)
{
self::$m_pInstance = new Database();
}
return self::$m_pInstance;
}
public function query($query)
{
return mysql_query($query);
}
}
?>
& we can call it from other files- &我们可以从其他文件中调用它-
other.php其他.php
<?php
include 'singleton.php';
$pDatabase = Database::getInstance();
$result = $pDatabase->query('...');
?>
Create a config.php And add the code:创建一个 config.php 并添加代码:
config.php:
$hostname = 'host';
$username = 'username';
$password = 'password';
$dbname = 'dbname';
$conn = mysqli_connect($hostname, $username, $password) OR die('Unable to connect to database! Please try again later.');
mysqli_select_db($conn, $dbname);
Then in any file you wish to use mysql, add the following:然后在您希望使用 mysql 的任何文件中,添加以下内容:
script2.php
<?php
require_once 'config.php';
mysqli_query($sqlApiAccess) or die('Error, insert query failed');
?>
There is no need to make connection in each function.无需在每个功能中进行连接。 you need to make a connection file like
conn.php
and make the connection queries.您需要创建一个像
conn.php
这样的连接文件并进行连接查询。
<?php
mysql_connect("localhost", "admin", "1admin") or die(mysql_error());
mysql_select_db("test") or die(mysql_error());
?>
in any other file where you want to connect database just write this line在要连接数据库的任何其他文件中,只需写下这一行
<?php include("conn.php");?>
On this file you are able to run any query.在此文件上,您可以运行任何查询。
do this:做这个:
$db_connection= mysql_connect($hostname, $username, $password) OR DIE('Unable to connect to database! Please try again later.');
And every time you want to query:每次您要查询时:
mysql_query("my_query",$db_connection);
Note, if you connect to the DB in a function, you will need to global $db_connection
.请注意,如果您在函数中连接到数据库,则需要全局
$db_connection
。
And when you want to close the DB connection:当你想关闭数据库连接时:
mysql_close($db_connection);
Why won't you move out the connection information into config and the call to mysql_connect
into some factory?你为什么不把连接信息移到 config 并将对
mysql_connect
的调用移到某个工厂?
Eg例如
class ConnectionFactory {
public static MysqlConnection CreateConnection() {
$connection = mysql_connect(Config::$host, Config::$port etc);
mysql_select_db($connection, Config::$schema);
return $connection;
}
}
and then in your code然后在你的代码中
$connection = ConnectionFactory::CreateConnection();
mysql_query($connection, $sqlApiAccess) or die('Error, insert query failed');
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