PHP如何实现数据库连接池
首先定义一个类并声明一个属性作为连接池子；然后在构造方法中向池子进行填充连接实例；最后再定义一个取出方法和放回方法，取出时将连接池最后一个连接实例进行出栈并返回，放回时将连接实例压入连接池末栈即可。
实例代码：
<?php
namespace DbConnect;
class Pool
{
protected $size = 10;
protected $connects = [];
protected $dbConf = [
'hostname' => '127.0.0.1',
'username' => 'root',
'password' => '123456',
'dbname' => 'dbname'
];
public function __construct($size = 10, $dbConf = [])
{
$this->size = $size;
$this->dbdbConf = array_merge($this->dbdbConf, $dbdbConf);
for($index = 1; $index <= $this->size; $index ++) {
$connect = mysqli_connect(
$this->dbConf['hostname'],
$this->dbConf['username'],
$this->dbConf['password'],
$this->dbConf['dbname']
);
array_push($this->connects, $connect);
}
}
public function getConnect()
{
if (count($this->connects) <= 0) {
throw new ErrorException( "数据库连接池中已无链接资源，请稍后重试!" );
} else {
return array_pop($this->connects);
}
}
public function release($connect)
{
if (count($this->connects) >= $this->size) {
throw new ErrorException("数据库连接池已满");
} else {
array_push($this->connects, $connect);
}
}
}