在 PHP 中,您可以使用多種方法與 Linux 上的數據庫進行交互。以下是一些常見的數據庫及其對應的 PHP 擴展和示例:
要使用 PHP 與 MySQL 數據庫交互,您需要安裝并啟用 mysqli
或 PDO_MySQL
擴展。
使用 mysqli:
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 創建連接
$conn = new mysqli($servername, $username, $password, $dbname);
// 檢查連接
if ($conn->connect_error) {
die("連接失敗: " . $conn->connect_error);
}
// 查詢數據
$sql = "SELECT id, name FROM myTable";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 輸出每行數據
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
}
} else {
echo "0 結果";
}
$conn->close();
使用 PDO_MySQL:
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
// 設置 PDO 錯誤模式為異常
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// 查詢數據
$stmt = $conn->query("SELECT id, name FROM myTable");
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
}
} catch(PDOException $e) {
echo "連接失敗: " . $e->getMessage();
}
$conn = null;
要使用 PHP 與 PostgreSQL 數據庫交互,您需要安裝并啟用 pgsql
或 PDO_PGSQL
擴展。
使用 pgsql:
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
// 創建連接
$conn = pg_connect("host=$servername dbname=$dbname user=$username password=$password");
// 檢查連接
if (!$conn) {
echo "連接失敗";
exit;
}
// 查詢數據
$query = "SELECT id, name FROM myTable";
$result = pg_query($conn, $query);
if ($result) {
while ($row = pg_fetch_assoc($result)) {
echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
}
} else {
echo "查詢失敗";
}
pg_close($conn);
使用 PDO_PGSQL:
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";
try {
$conn = new PDO("pgsql:host=$servername;dbname=$dbname", $username, $password);
// 設置 PDO 錯誤模式為異常
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// 查詢數據
$stmt = $conn->query("SELECT id, name FROM myTable");
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
}
} catch(PDOException $e) {
echo "連接失敗: " . $e->getMessage();
}
$conn = null;
請根據您的需求選擇合適的數據庫擴展,并確保已正確安裝和配置。