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PHP課程 / 獲取最后的 ID

獲取最后的 ID

獲取最后插入的記錄的 ID

如果我們?cè)谟?AUTO_INCREMENT 字段的表上執(zhí)行 INSERTUPDATE 操作,我們可以立即獲取最后插入/更新的記錄的 ID。

在 "MyGuests" 表中,id 列是一個(gè) AUTO_INCREMENT 字段:

CREATE TABLE MyGuests (
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
firstname VARCHAR(30) NOT NULL,
lastname VARCHAR(30) NOT NULL,
email VARCHAR(50),
reg_date TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
)

下例與上一頁中的例子相同,除了我們添加了一行代碼來檢索最后插入的記錄的 ID。我們還輸出了最后插入的 ID:

實(shí)例(MySQLi 面向?qū)ο螅?/h3>
<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 創(chuàng)建連接
$conn = new mysqli($servername, $username, $password, $dbname);
// 檢查連接
if ($conn->connect_error) {
  die("連接失?。?quot; . $conn->connect_error);
}

$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";

if ($conn->query($sql) === TRUE) {
  $last_id = $conn->insert_id;
  echo "新記錄已成功創(chuàng)建。最后插入的ID是:" . $last_id;
} else {
  echo "錯(cuò)誤:" . $sql . "<br>" . $conn->error;
}

$conn->close();
?>

實(shí)例(MySQLi 過程化)

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 創(chuàng)建連接
$conn = mysqli_connect($servername, $username, $password, $dbname);
// 檢查連接
if (!$conn) {
  die("連接失敗:" . mysqli_connect_error());
}

$sql = "INSERT INTO MyGuests (firstname, lastname, email)
VALUES ('John', 'Doe', 'john@example.com')";

if (mysqli_query($conn, $sql)) {
  $last_id = mysqli_insert_id($conn);
  echo "新記錄已成功創(chuàng)建。最后插入的ID是:" . $last_id;
} else {
  echo "錯(cuò)誤:" . $sql . "<br>" . mysqli_error($conn);
}

mysqli_close($conn);
?>

實(shí)例(PDO)

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDBPDO";

try {
  $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
  // 將 PDO 錯(cuò)誤模式設(shè)置為異常
  $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  $sql = "INSERT INTO MyGuests (firstname, lastname, email)
  VALUES ('John', 'Doe', 'john@example.com')";
  // 使用exec(),因?yàn)闆]有返回結(jié)果
  $conn->exec($sql);
  $last_id = $conn->lastInsertId();
  echo "新記錄已成功創(chuàng)建。最后插入的 ID 是:" . $last_id;
} catch(PDOException $e) {
  echo $sql . "<br>" . $e->getMessage();
}

$conn = null;
?>