Zend DB Selecting constants - columns that do not

问题:

I'm trying to do this query using Zend DB select but I'm not able to do so

This is the sql query

select shopping_id,shopping_details,"friend" as type
from shopping

Notice here how I'm specifying "friend" as type and friend is not a column in the shopping table.

Now how do I do this in Zend. I have tried this but it gives me an error saying "sh.friend Column does not exist"

$select->from(array('sh'=>'shopping'),array('shopping_id','shopping_details','"friend" as type');

Any help will be appreciated thanks

回答1:

Try with Zend_Db_Expr, maybe something like:

$select->from(array('sh'=>'shopping'),
    array('shopping_id','shopping_details',
         new Zend_Db_Expr('"friend" as type'));

回答2:

$select->from(
    array('sh'=>'shopping'),
    array('shopping_id','shopping_details','friend'=>'type', 'alias'=>'column or expression')
);