Zend / Db / Sql / columns中的新Zend框架更改导致问题

Question

Our framework sits on top of the Zend framework. A change in the way columns() is working causes problems with our database calls. Before, it was fine to do something like:

$distanceFormula = "$earthRadius*ACOS(COS(RADIANS($lat)))";
$select->columns(array('distance' => $distanceFormula));

This created a query:

SELECT `items`.*, 6371*ACOS(COS(RADIANS(51.985103)) AS `distance`

NOW it creates a query:

SELECT `items`.*, `6371*ACOS(COS(RADIANS(51.985103))` AS `distance`

columns() puts ` (apostrophe) around everything so we get the following error:

Zend_Db_Statement_Mysqli_Exception
Mysqli prepare error: Unknown column '6371*ACOS.... etc

Is there a way to tell columns not to put the formula between apostrophes?

Answer 1

I found that if the formula is entered as Zend_Db_Expr, everything works fine.

$distanceFormula = new Zend_Db_Expr("($earthRadius*ACOS(COS(RADIANS($lat))");
$select->columns(array('distance' => $distanceFormula));