Re: Do entities require a primary key?
Re: Do entities require a primary key?
- Subject: Re: Do entities require a primary key?
- From: Johnny Miller <email@hidden>
- Date: Wed, 9 Dec 2009 13:25:31 -1000
The table has two columns an "IP_FROM" and an "IP_TO", each contains an IP number.
According to the manual after you convert an IP address to an IP number it can only resolve to one row in the database i.e.
IP_FROM <= X <= IP_TO
So, I'd assume that the multi-column PK would work because the combo of IP_FROM and IP_TO has to be unique. I've never created column pk like that before - can I find the info in the Apple supplied docs?
re: raw SQL. Yeah, I planned on that.
Thanks a lot,
Johnny
On Dec 9, 2009, at 1:12 PM, Chuck Hill wrote:
> Are the rows unique? If so, you can make a multi-column PK. EOF needs _something_ to uniquely identify them if you want to make EOs out of the data. You might also want to consider just raw SQL (raw rows) and / or making a cache of these and avoiding the EO overhead.
>
> Chuck
>
> On Dec 9, 2009, at 3:04 PM, Johnny Miller wrote:
>
>> Hi,
>>
>> I just purchased a database that does IP address to country resolution. I'm reverse engineering the database into a Wonder Framework and I realized that the single table in the database doesn't have a primary key. WOLips doesn't like this and throws an error stating the entity does not have a primary key.
>>
>> Should I just create a primary key field and leave it blank? Or is there a better alternative? This is going to be a read only database.
>>
>> Thanks in advance,
>>
>> Johnny Miller
>> Kahalawai Media Corp
>> http://www.kahalawai.com
>>
>>
>>
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> Chuck Hill Senior Consultant / VP Development
>
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Johnny Miller
Kahalawai Media Corp
http://www.kahalawai.com
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