MySQL错误：列的'时间'不能为空

Question

我得到的错误：使用下面的查询时，列的'时间'不能为空，它没有重复，但当再次尝试更新时第一次正常工作我得到的错误：列“时间”不能为空

mysql_query(" 
    INSERT INTO 
    $table(Username, Time, Videos, Credits) 
    VALUES 
    ('$user', '$time', '$videos', '$credits') 
    ON DUPLICATE KEY UPDATE 
    Time=Time+INTERVAL $time SECOND 
    Videos=Videos+'$videos', 
    Credits=Credits+'$credits' 
    ", 
    $conn 
    ); 

希望你能发现我的错误，因为我是新来这个，谢谢！

下面是一些我的代码：

$conn = mysql_connect(DB_HOST,DB_USER,DB_PASSWORD); 
mysql_select_db(DB_NAME, $conn); 

// Error checking 
if(!$conn) { 
    die('Could not connect ' . mysql_error()); 
} 

// Localize the GET variables 
$user = isset($_GET['username']) ? $_GET['username'] : ""; 
$time = isset($_GET['time']) ? $_GET['time'] : ""; 
$videos = isset($_GET['videos']) ? $_GET['videos'] : ""; 
$credits = isset($_GET['credits']) ? $_GET['credits'] : ""; 

// Protect against sql injections 
$user = mysql_real_escape_string($user); 
$time = mysql_real_escape_string($time); 
$videos = mysql_real_escape_string($videos); 
    $credits = mysql_real_escape_string($credits); 
    $secret = mysql_real_escape_string($secret); 

// Insert 
$retval = mysql_query(" 
    INSERT INTO 
    $table(Username, Time, Videos, Credits) 
    VALUES 
    ('$user', '$time', '$videos', '$credits') 
    ON DUPLICATE KEY UPDATE 
    Time = DATE_ADD(IFNULL(Time,now()),INTERVAL '$time' SECOND), 
    Videos = Videos+'$videos', 
    Credits = Credits+'$credits' 
    ", 
    $conn 
    ); 
    // End Query 


if($retval) { 
    echo "Success! Updated $user with Time: $time - Videos: $videos - Credits: $credits"; 
} else { 
    echo "<b>ERROR:</b><br>" . mysql_error(); 
} 

mysql_close($conn); 

Answer 1

它应该是：

mysql_query(" 
INSERT INTO 
$table(Username, `Time`, Videos, Credits) 
VALUES 
('$user', '$time', '$videos', '$credits') 
ON DUPLICATE KEY UPDATE 
Time = DATE_ADD(IFNULL(`Time`,now()),INTERVAL '$time' SECOND) 
,Videos = Videos+'$videos' 
,Credits = Credits+'$credits' 
", 
$conn 
); 

不要忘了把单引号周围的所有注射变量，否则mysql_real_escape_string将不保护你。

参见：
http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_date-add

Answer 2

如果没有重复的，那么这个查询将执行插入，和Time值为空，因为没有值永远设置。 Null + anything为空，因此是错误。

尝试使用... Time = COALESCE(Time, 0) + INTERVAL $time SECOND或类似的方法得到aroun dit。