数据库连接池是一种管理数据库连接的技术,它预先创建并维护一组数据库连接,应用程序可以从池中获取连接,使用完毕后归还到池中,而不是每次都新建和关闭连接。这样可以显著提高数据库访问的性能和效率。
适用于高并发、高访问量的Web应用,如电商网站、社交平台等。
以下是一个简单的PHP MySQL数据库连接池配置示例:
<?php
class ConnectionPool {
private $pool = [];
private $maxConnections;
private $dbConfig;
public function __construct($dbConfig, $maxConnections = 10) {
$this->dbConfig = $dbConfig;
$this->maxConnections = $maxConnections;
for ($i = 0; $i < $maxConnections; $i++) {
$this->pool[] = $this->createConnection();
}
}
private function createConnection() {
$conn = mysqli_connect(
$this->dbConfig['host'],
$this->dbConfig['user'],
$this->dbConfig['password'],
$this->dbConfig['database']
);
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
return $conn;
}
public function getConnection() {
if (empty($this->pool)) {
throw new Exception("No available connections in the pool.");
}
return array_pop($this->pool);
}
public function releaseConnection($conn) {
$this->pool[] = $conn;
}
}
$dbConfig = [
'host' => 'localhost',
'user' => 'root',
'password' => 'password',
'database' => 'testdb'
];
$pool = new ConnectionPool($dbConfig);
// 获取连接
$conn = $pool->getConnection();
// 执行查询
$query = "SELECT * FROM users";
$result = mysqli_query($conn, $query);
// 处理结果
while ($row = mysqli_fetch_assoc($result)) {
echo $row['name'] . "<br>";
}
// 释放连接
$pool->releaseConnection($conn);
?>
releaseConnection
方法。通过以上配置和示例代码,可以有效管理PHP应用中的MySQL数据库连接,提升系统性能和稳定性。
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