返回最後插入自動遞增標識php

Question

我沒有插入任何值，但autocrement其中一列，我怎麼能得到最後插入的id值？

我用回聲mysql_insert_id();但我給了我'0'這似乎不正確。

Answer 1

mysql_insert_id（）僅在將數據插入到表中時才起作用。

Answer 2

1. 數據庫

   CREATE TABLE MyGuests（ ID INT（6）UNSIGNED AUTO_INCREMENT PRIMARY KEY， 姓名VARCHAR（30）NOT NULL， 姓氏VARCHAR（30）NOT NULL， 電子郵件VARCHAR（50 ）， reg_date TIMESTAMP ） 最後插入的ID：

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1. 實施例（mysqli的面向對象）

---

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

// Create connection 
$conn = new mysqli($servername, $username, $password, $dbname); 
// Check connection 
if ($conn->connect_error) { 
    die("Connection failed: " . $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 "New record created successfully. Last inserted ID is: " . $last_id; 
} else { 
    echo "Error: " . $sql . "<br>" . $conn->error; 
} 

$conn->close(); 
?> 

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實施例（庫MySQLi程序）

---

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

// Create connection 
$conn = mysqli_connect($servername, $username, $password, $dbname); 
// Check connection 
if (!$conn) { 
    die("Connection failed: " . 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 "New record created successfully. Last inserted ID is: " . $last_id; 
} else { 
    echo "Error: " . $sql . "<br>" . mysqli_error($conn); 
} 

mysqli_close($conn); 
?> 

---

1. 實施例（PDO）

---

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

try { 
    $conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password); 
    // set the PDO error mode to exception 
    $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 
    $sql = "INSERT INTO MyGuests (firstname, lastname, email) 
    VALUES ('John', 'Doe', 'john@example.com')"; 
    // use exec() because no results are returned 
    $conn->exec($sql); 
    $last_id = $conn->lastInsertId(); 
    echo "New record created successfully. Last inserted ID is: " . $last_id; 
    } 
catch(PDOException $e) 
    { 
    echo $sql . "<br>" . $e->getMessage(); 
    } 

$conn = null; 
?>