ZF2 Zend \\ Db使用Mysql表达式插入/更新（Zend \\ Db \\ Sql \\ Expression？）

Question

Is there any way to include MySQL expressions like NOW() in the current build of ZF2 (2.0.0beta4) through Zend\\Db and/or TableGateway insert()/update() statements?

Here is a related post on the mailing list, though it hasn't been answered: http://zend-framework-community.634137.n4.nabble.com/Zend-Db-Expr-and-Transactions-in-ZF2-Db-td4472944.html

It appears that ZF1 used something like:

    $data = array( 
        'update_time'   => new \Zend\Db\Expr("NOW()") 
    ); 

And after looking through Zend\\Db\\Sql\\Expression I tried:

    $data = array(
        'update_time' => new \Zend\Db\Sql\Expression("NOW()"),
    );

But get the following error:

Catchable fatal error: Object of class Zend\Db\Sql\Expression could not be converted to string in /var/www/vendor/ZF2/library/Zend/Db/Adapter/Driver/Pdo/Statement.php on line 256

As recommended here: http://zend-framework-community.634137.n4.nabble.com/ZF2-beta3-Zend-Db-Sql-Insert-new-Expression-now-td4536197.html I'm currently just setting the date with PHP code, but I'd rather use the MySQL server as the single source of truth for date/times.

    $data = array(
        'update_time' => date('Y-m-d H:i:s'),
    );

Thanks, I appreciate any input!

Answer 1

Zend_Db_Sql_Expression works for me now.

$data = array(
    'update_time' => new \Zend\Db\Sql\Expression("NOW()"),
);

Answer 2

我不确定他们是否在最新的更新中解决了这个问题，但这是一个知道的错误 ，即使他们说它已修复，对我来说它仍然无法在修复后工作。

Answer 3

It works for me too. Maybe, your problem was like mine. The string error conversion was because the parameter that I passed to method was elements of array and not the array. Check this and have sure that you are passing $object->method($array).

Answer 4

You can try:

\Zend\Db\Sql\Predicate\Literal();
//or
\Zend\Db\Sql\Literal();
------------------------------------
$data = array(
    'update_time' => new \Zend\Db\Sql\Literal("NOW()"),
);

https://framework.zend.com/manual/2.2/en/modules/zend.db.sql.html#literal-literal