PHP MySQLi INSERT不插入数据(PHP MySQLi INSERT not inserting data)

 我正在尝试将mysqli插入到数据库表中，连接正常，$ _GET ['emailaddress']已填充，表存在，它只是没有插入数据。 
 
$connection = mysqli_connect("localhost","database","password");

mysqli_select_db($connection, "database");

if (mysqli_connect_errno()) {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
        die;
}else{
        echo 'success';
}

mysqli_query($connection, "INSERT INTO `campaign` (`email`) VALUES ('" . $_GET['emailaddress'] . "'");

mysqli_close($connection);

I am trying to do an mysqli insert into a database table, the connection is working, the $_GET['emailaddress'] is populated, the table exist, its just no data is being inserted.
 
$connection = mysqli_connect("localhost","database","password");

mysqli_select_db($connection, "database");

if (mysqli_connect_errno()) {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
        die;
}else{
        echo 'success';
}

mysqli_query($connection, "INSERT INTO `campaign` (`email`) VALUES ('" . $_GET['emailaddress'] . "'");

mysqli_close($connection);

原文：https://stackoverflow.com/questions/29147127