Dbo::field map access

Added by Alistair Lowe almost 11 years ago

Hi guys,

On my website I have a text search box and a column selection box so for example I may wish to search for "hello 1" in the "Description" column.

My issue is that when I feed my search string into Witty's .bind() in the query, it's not type-aware of the column and treats all search text as a string, even though some columns are other data types.

Is it at all possible to gain access to the variable/string relations formed by Dbo::field? Or is there some other approach I could take to this issue?

Many thanks

Replies (3)

RE: Dbo::field map access - Added by Koen Deforche almost 11 years ago

Hey Alistair,

You can use Query::fields() for a query that (would) select the object, e.g.

  fields = session.find<Table>().fields()

Regards,

koen

RE: Dbo::field map access - Added by Alistair Lowe almost 11 years ago

Hi Koen,

Apologies for the late reply, have been pulled off onto other matters as usual.

I give this code a try and it bombs out the debugger so I can't even pin-point where an error may have occurred.

std::vector<dbo::FieldInfo> temp = session->find<LinkBox>().fields();

Must I inherit from a certain class when constructing my dbo table class for this to work? Currently I have this:

class LinkBox : public dbo::Dbo<LinkBox>
{
public:

    // Database Attributes
    Wt::WString description;
    Wt::WString UUID;
    int         numberOfLinks;
    Wt::WString location;

    // Database Relationships
    dbo::collection< dbo::ptr<LinkBoxSwitch> > linkBoxSwitches;

    // Database Functions
    template<class Action>
    void persist( Action &a )
    {
        dbo::field( a, description,   "Description" );
        dbo::field( a, UUID,          "UUID" );
        dbo::field( a, numberOfLinks, "Number of Links" );
        dbo::field( a, location,      "Location" );

        dbo::hasMany( a, linkBoxSwitches, dbo::ManyToOne, "LinkBox" );
    }
};

Many thanks

RE: Dbo::field map access - Added by Alistair Lowe almost 11 years ago

Hoho never mind,

I've implemented a different approach via session but I think the issue was actually a bug in GDB and C for Ubuntu 13.04, had to downgrade GDB to the version that runs on 12.10.

(1-3/3)

Project

General

Profile

Wt