SQLite不保存主键[关闭]

Question

The following code doesn't save a "eventid" in the sqlite db by default. I can see all the rows with echo but the event ID is emply... Any ideas why? Thanks a lot.

$now = time();
try{
if (!file_exists("testgb")){
    $db = new PDO('sqlite:testgb');
    $db->exec("CREATE TABLE guestbook (eventid INTEGER PRIVATE KEY,name VARCHAR(55), message TEXT, date DATETIME)");
}
$db = new PDO('sqlite:testgb');
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$db->exec("INSERT INTO guestbook (name, message, date) VALUES ('KIRILL', 'Hello!!', datetime($now, 'unixepoch'))"); 
$res = $db->query("SELECT * FROM guestbook");
foreach ($res as $row){
    echo $row['eventid']."<br>";
    echo $row['name']."<br>";
    echo $row['message']."<br>";
    echo $row['date']."<br>";
    echo "<hr>";
}
}catch (PDOException $e){
    echo $e->getMessage();
}

Answer 1

Would you like to add AUTOINCREMENT event id? and PRIMARY KEY?

$db->exec("CREATE TABLE guestbook (eventid INTEGER PRIMARY KEY AUTOINCREMENT,name VARCHAR(55), message TEXT, date DATETIME)");