Re: Can odb store any TQuery and etc? -- Spider ODB

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Date Posted: 18:26:52 05/31/01 Thu
Author: Marcel
Subject: Re: Can odb store any TQuery and etc?
In reply to: Michel 's message, "Re: Can odb store any TQuery and etc?" on 14:33:13 05/31/01 Thu

Hi Michel,

I am glad that I finally find something that traditional rdbm can't do. Could I pack all aspect of a customer, include its history and purchasing behaviour in an object, then send it through the inet in one round trip?

What I mean store an TQuery object is an Object with result set which ready to display in TDBGrid. If I defined the cust_purchasing_hist field to a type of TQuery, then store the TQuery obj. as an sub-obj. of customer file. It is convenient to send a whole customer file in a basket and use rad tools to rebuild the info.

Another possible use of store a TQuery obj. is use in web session tracking. Since java and perl can use this method to track client visit, why not Obj. Pascal?

Thanks
Marcel
>
>Hi Marcel,
>
>A TQuery allows you to retrieve data from one or more
>tables in a relational database using SQL. In version
>2, of Spider ODB, the TObjectQuery also retrieve
>objects based on SQL statements. But this objects
>cannot be easily displayed in standard grids. You
>would need to write to code to convert your objects
>into a grid-like data representation.
>
>The advantage of the Spider ODB, is your store
>objects, so yes, your customer object can have photos,
>voice, or any other type of data. You need to create
>your customer object class, then make it persistent.
>There are more details on this in the programmer's
>guide.
>
>Best regards,
>
>Michel
>
>>Hello Michel,
>>
>>I get some idea about purpose of object storage. Could
>>odb store an object like TQuery or a grid? Could it
>>store a customer file include his voice and photo?
>>
>>I am still exloring the odb. Since most of my
>>experience is come from rdbm, I get lots of confusion.
>>
>>Thanks
>>Marcel

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Replies:

Re: Can odb store any TQuery and etc? -- Michel, 04:30:49 06/04/01 Mon