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Re: Primary keys
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Re: Primary keys


  • Subject: Re: Primary keys
  • From: Mark Wardle <email@hidden>
  • Date: Thu, 02 Oct 2014 11:49:29 +0100

Thanks Fabian.

Can one use ERXMigration to add a serial column? I don’t think it is a JDBC column type? I can create an integer column and then add the serial default value in SQL presumably. I suspect there isn’t a database agnostic way to do this.

I’ll try that. Thank you again,

Mark

> On 2 Oct 2014, at 10:43, Fabian Peters <email@hidden> wrote:
>
> Hi Mark,
>
> For postgresql you could add a column "serial". When the column is added, it is populated with values by postgres. You could then use migration's "setPrimaryKey" and "dropPrimaryKey".
>
> This is totally untested…
>
> Fabian
>
> Am 02.10.2014 um 11:00 schrieb Mark Wardle <email@hidden>:
>
>> Dear all,
>>
>> I need to add a new primary key to a table that already contains data.
>>
>> Is it possible to use migrations to add this and have the column auto-populated with a serial number?
>>
>> My other plan was to create an integer column and then, in code, iterate through the objects manually setting the serial integer, and then later on migrating that to a primary key. Would this then break primary key generation for newly created objects?
>>
>> All advice appreciated!
>>
>> Many thanks,
>>
>> Mark
>>
>>
>> --
>> Dr. Mark Wardle
>> Consultant Neurologist, University Hospital Wales, Cardiff, UK
>> Email: email@hidden or email@hidden  Twitter: @mwardle
>> Telephone: 02920745274 (secretary) or facsimile: 02920744166
>>
>>
>>
>>
>>
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References: 
 >Primary keys (From: Mark Wardle <email@hidden>)
 >Re: Primary keys (From: Fabian Peters <email@hidden>)

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