返回上次插入的id在php中不起作用
我的post_id是一个自动递增字段。它给了我一个“0”,而不是上次插入的id。如果您的查询确实有效,请验证。。。您可能混合了过时的mysql连接器和mysqli连接器。是来自mysql连接器的函数。改用 试一试 插入新行时不要包含post\u id,因为它是自动递增的。数据库返回上次插入的id在php中不起作用,php,mysql,mysqli,Php,Mysql,Mysqli,我的post_id是一个自动递增字段。它给了我一个“0”,而不是上次插入的id。如果您的查询确实有效,请验证。。。您可能混合了过时的mysql连接器和mysqli连接器。是来自mysql连接器的函数。改用 试一试 插入新行时不要包含post\u id,因为它是自动递增的。数据库 if($result) { echo $db->insert_id; }else{ echo "Something is wrong. Insert failed.."; } 为什么要在post
if($result) {
echo $db->insert_id;
}else{
echo "Something is wrong. Insert failed..";
}
为什么要在post_id中插入空白值?也许删除它你是什么MySQL API?您在第一行中使用了一个OO接口,它建议使用mysqli或PDO。以后必须使用相应的函数,而不是mysql\u XXX。@如果删除它,gwillie将无法工作。post_id是AI
if($result) {
echo $db->insert_id;
}else{
echo "Something is wrong. Insert failed..";
}
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
)
last inserted ID:
-------------------------------------------------------------------
1. Example (MySQLi Object-oriented)
-------------------------------------------------------------------
<?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();
?>
-------------------------------------------------------------------
2. Example (MySQLi Procedural)
-------------------------------------------------------------------
<?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);
?>
-------------------------------------------------------------------
3. Example (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;
?>