在PHP的LNMP(Linux, Nginx, MySQL, PHP)環(huán)境中處理數(shù)據(jù)庫(kù)連接通常涉及以下幾個(gè)步驟:
sudo systemctl status mysql
如果MySQL服務(wù)沒(méi)有運(yùn)行,你可以使用以下命令來(lái)啟動(dòng)它:
sudo systemctl start mysql
CREATE DATABASE mydatabase;
CREATE USER 'myuser'@'localhost' IDENTIFIED BY 'mypassword';
GRANT ALL PRIVILEGES ON mydatabase.* TO 'myuser'@'localhost';
FLUSH PRIVILEGES;
sudo apt-get install php-mysql
對(duì)于PDO,你可以安裝相應(yīng)的驅(qū)動(dòng)程序,例如php-mysql
或php-pdo-mysql
:
sudo apt-get install php-mysql
<?php
$servername = "localhost";
$username = "myuser";
$password = "mypassword";
$dbname = "mydatabase";
// 創(chuàng)建連接
$conn = new mysqli($servername, $username, $password, $dbname);
// 檢查連接
if ($conn->connect_error) {
die("連接失敗: " . $conn->connect_error);
}
echo "連接成功";
$conn->close();
?>
<?php
$servername = "localhost";
$username = "myuser";
$password = "mypassword";
$dbname = "mydatabase";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// 設(shè)置 PDO 錯(cuò)誤模式為異常
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "連接成功";
} catch(PDOException $e) {
echo "連接失敗: " . $e->getMessage();
}
// 關(guān)閉連接
$conn = null;
?>
確保在嘗試連接之前,你已經(jīng)正確配置了數(shù)據(jù)庫(kù)服務(wù)器的詳細(xì)信息,并且數(shù)據(jù)庫(kù)用戶具有適當(dāng)?shù)臋?quán)限。