CodeIgniter Active Record：防止重複插入

Question

我試着用SQLLite中的一個簡單的用戶表CodeIgniter，它包含id，名稱，電子郵件。

如何防止在使用Active Record時插入重複項？

我試過以下，但它只是不斷重複建立...

$data = array(
    'email' => 'd@d.com' , 
    'name' => 'dave' 
); 

$this->db->where('users.email != ', 'd@d.com'); 
$this->db->insert('users', $data); 

Answer 1

添加UNIQUE INDEX提到了完整的安全。

然後，你可以......做這樣的事情：

$email = 'd@d.com'; 
$name = 'dave'; 

$this->db->query(" 
INSERT INTO users VALUES (email, name) 
SELECT email, name 
FROM (SELECT ? AS email, ? AS name) AS h 
HAVING ! (SELECT COUNT(*) FROM users WHERE email = h.email) 
", array($email, $name));