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PHP如何與Linux數據庫交互

小樊
42
2025-09-04 12:31:02
欄目: 編程語言

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:

  1. MySQL 數據庫

要使用 PHP 與 MySQL 數據庫交互,您需要安裝并啟用 mysqliPDO_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;
  1. PostgreSQL 數據庫

要使用 PHP 與 PostgreSQL 數據庫交互,您需要安裝并啟用 pgsqlPDO_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。

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