问题描述
详细信息
我正在为新的或续订的许可证到期的单次插入。到期时间为插入日期2年。
如果检测到重复,则该条目将被更新,使得到期时间等于剩余到期时间加上2年。
关于在下面的示例中,应该只有一行包含user_id = 55和license = commercial。
TABLE: licence_expiry
------------------------------ --------------------------
| user_id |许可证|到期|
---------------------------------------------- ----------
| 55 |商业| 2013-07-04 05:13:48 |
---------------------------------------------- -----------
user_id(int11),license(varchan50),到期(DATETIME)
我认为在mysql中你会写这样的东西(请注意我没有检查这个代码是否可以在mysql中使用。)
INSERT INTO`licence_expiry`
/ pre>
(`user_id`,`licence`,'expiry`)
VALUES
(55,commercial,NOW()+ INTERVAL 2 YEAR)
ON DUPLICATE KEY UPDATE
`expiry` =`expiry` + INTERVAL 2 YEAR
问题:如何使用PDO执行此操作?我写了一个粗略的概要,我想我将会使用什么,但是我不知道为 ON DUPLICATE KEY UPDATE的到期值写什么。
$ sql =INSERT INTO $ table(user_id,license,expiry)
VALUES(
:user_id,
:license ,
:expiry)
ON DUPLICATE KEY UPDATE expiry = Something;
try {
$ dbh = new PDO('login info here');
$ dbh-> setAttribute(PDO :: ATTR_ERRMODE,PDO :: ERRMODE_EXCEPTION);
$ stmt = $ dbh-> prepare($ sql);
$ stmt-> bindParam(':user_id',$ userID,PDO :: PARAM_INT);
$ stmt-> bindParam(':license',$ license,PDO :: PARAM_STR);
$ stmt-> bindParam(':expiry',$ expiry,PDO :: PARAM_STR);
$ stmt-> execute();
// $ stmt-> closeCursor(); //如果您继续使用另一个DB函数,则使用此代替$ dbh = null
$ dbh = null;
}
catch(PDOException $ e)
{
$ error = $ e-> getMessage();
}
任何帮助都非常感激。
解决方案您可以使用MySQL的功能:
因此在你的情况下:
ON DUPLICATE KEY UPDATE expiry = VALUES(expiry)
或者,您可以创建一个第四个参数,您再次绑定
$ expiry
$ sql =INSERT INTO $ table(user_id,license,expiry)
VALUES(
:user_id,
:license,
:expiry)
ON DUPLICATE KEY UPDATE expiry =:another;
try {
$ dbh = new PDO('login info here');
$ dbh-> setAttribute(PDO :: ATTR_ERRMODE,PDO :: ERRMODE_EXCEPTION);
$ stmt = $ dbh-> prepare($ sql);
$ stmt-> bindParam(':user_id',$ userID,PDO :: PARAM_INT);
$ stmt-> bindParam(':license',$ license,PDO :: PARAM_STR);
$ stmt-> bindParam(':expiry',$ expiry,PDO :: PARAM_STR);
$ stmt-> bindParam(':another',$ expiry,PDO :: PARAM_STR);
$ stmt-> execute();
//等
DETAILS
I am doing a single insert for the expiry of a new or renewed licence. The time period for the expiry is 2 years from the insertion date.If a duplicate is detected, the entry will be updated such that the expiry equals the remaining expiry plus 2 years.
Regarding duplicates, in the example below there should only be one row containing user_id =55 and licence=commercial.
TABLE: licence_expiry
-------------------------------------------------------- | user_id | licence | expiry | -------------------------------------------------------- | 55 | commercial | 2013-07-04 05:13:48 | ---------------------------------------------------------
user_id (int11), licence (varchan50), expiry (DATETIME)
I think in mysql you would write it something like this (Please note that I haven't checked whether the code works in mysql. )
INSERT INTO `licence_expiry` (`user_id`, `licence`, `expiry`) VALUES (55, commercial, NOW()+ INTERVAL 2 YEAR) ON DUPLICATE KEY UPDATE `expiry` = `expiry` + INTERVAL 2 YEAR
QUESTION: How can I do this with PDO? I've written a rough outline of what I think I will use, but I'm not sure what to write for the expiry value for the ON DUPLICATE KEY UPDATE.
$sql = "INSERT INTO $table (user_id, licence, expiry) VALUES ( :user_id, :licence, :expiry) ON DUPLICATE KEY UPDATE expiry = Something"; try { $dbh = new PDO('login info here'); $dbh->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION ); $stmt = $dbh->prepare($sql); $stmt->bindParam(':user_id', $userID, PDO::PARAM_INT); $stmt->bindParam(':licence',$licence, PDO::PARAM_STR); $stmt->bindParam(':expiry',$expiry, PDO::PARAM_STR); $stmt->execute(); //$stmt->closeCursor(); //use this instead of $dbh = null if you will continue with another DB function $dbh = null; } catch(PDOException $e) { $error=$e->getMessage(); }
Any help is much appreciated.
解决方案You can use MySQL's
VALUES()
function:Therefore, in your case:
ON DUPLICATE KEY UPDATE expiry = VALUES(expiry)
Alternatively, you can create a fourth parameter to which you bind
$expiry
again:$sql = "INSERT INTO $table (user_id, licence, expiry) VALUES ( :user_id, :licence, :expiry) ON DUPLICATE KEY UPDATE expiry = :another"; try { $dbh = new PDO('login info here'); $dbh->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION ); $stmt = $dbh->prepare($sql); $stmt->bindParam(':user_id', $userID , PDO::PARAM_INT); $stmt->bindParam(':licence', $licence, PDO::PARAM_STR); $stmt->bindParam(':expiry' , $expiry , PDO::PARAM_STR); $stmt->bindParam(':another', $expiry , PDO::PARAM_STR); $stmt->execute(); // etc.
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