问题描述
我需要在 Laravel 应用程序上以高精度存储 updated_at 时间戳，使用格式 "m-d-Y H:i:s.u"(包括毫秒)
I need to store updated_at timestamp with high precision on a laravel application, using the format "m-d-Y H:i:s.u" (including milisseconds)
根据 laravel 文档，我可以通过在类上设置 $dateFormat 属性来自定义日期格式，但是...
According to laravel documentation, I can customize the date format by setting the $dateFormat property on a class, but...
主要问题是当我使用 $table->nullableTimestamps() 时，Laravel 的架构构建器在数据库中添加了一个类型为时间戳的列，并且根据 mysql 文档，类型为 TIMESTAMP 的列只允许精确到秒..
The main problem is that Laravel's schema builder adds a column of type timestamp in the database when I use $table->nullableTimestamps() And according to mysql documentation, columns of type TIMESTAMP only allow the precision up to seconds..
关于我如何实现这一目标的任何想法?
Any ideas on how I could achieve that?
推荐答案
您不能这样做，因为 PHP PDO 驱动程序不支持时间戳中的小数秒.解决方法是选择时间戳作为字符串，这样 PDO 驱动程序不知道它真的是时间戳，只需执行 $query->selectRaw(DB::raw("CONCAT(my_date_column) as my_date_column)")) 但是这意味着您不能对所有字段使用默认选择，因此查询变得非常痛苦.您还需要覆盖模型上的 getDateFormat.
You can't because the PHP PDO driver doesn't support fractional seconds in timestamps. A work around is to select the timestamp as a string instead so the PDO driver doesn't know its really a timestamp, simply by doing $query->selectRaw(DB::raw("CONCAT(my_date_column) as my_date_column")) however this means you can't use the default select for all fields so querying becomes a real pain. Also you need to override getDateFormat on the model.
// override to include micro seconds when dates are put into mysql.
protected function getDateFormat()
{
return 'Y-m-d H:i:s.u';
}
最后在你的迁移而不是 nullableTimestamps 中，在 Schema 回调之外做:
Finally in your migration rather than nullableTimestamps, outside of the Schema callback do:
DB::statement("ALTER TABLE `$tableName` ADD COLUMN created_at TIMESTAMP(3) NULL");
注意这个例子是 3 个小数位，但是如果你愿意，你最多可以有 6 个，通过在改变表和 sprintf 中的两个地方将 3 更改为 6，并将乘数 * 1000 调整为 10000006.
Note this example was for 3 decimal places however you can have up to 6 if you like, by changing the 3 to a 6 in two places, in the alter table and in the sprintf and also adjusting the multiplier * 1000 to 1000000 for 6.
希望有一天 PHP PDO 会被更新来解决这个问题，但它已经超过 5 年了，没有任何改变，所以我不抱希望.如果您对详细信息感兴趣，请参阅此错误报告:http://grokbase.com/t/php/php-bugs/11524dvh68/php-bug-bug-54648-new-pdo-forces-format-of-datetime-fields我在另一个答案中找到了这个链接，它可能会帮助您更了解这个问题:https://stackoverflow.com/a/22990991/259521
Hopefully some day PHP PDO will be updated to fix this, but its been over 5 years and nothings changed so I don't have my hopes up. In case you are interested in the details, see this bug report: http://grokbase.com/t/php/php-bugs/11524dvh68/php-bug-bug-54648-new-pdo-forces-format-of-datetime-fields I found that link in this other answer which might help you more understand the issue: https://stackoverflow.com/a/22990991/259521
PHP 最近真的很老了，我认为这个问题是我考虑迁移到更现代的 Node.js 的原因之一.
PHP is really showing its age lately, and I would consider this issue one of my reasons for considering moving to the more modern Node.js.
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