URI for data object?

[Ken Anderson <ke...@amphorainc.com>]

Everyone,

I’ve been looking around the Cayenne API, but have not been able to find a way to serialize an object ID into a string, and then turn that string back into an object ID or object.  What’s the best/right way to do this?  For instance, if you want to store a reference to a database object in a text file…

Thanks,
Ken
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Re: URI for data object?

[Andrus Adamchik <an...@objectstyle.org>]

There's also this set of utilities to convert an object to a String ID and back:

    https://github.com/apache/cayenne/tree/master/cayenne-lifecycle/src/main/java/org/apache/cayenne/lifecycle/id

It uses the format like "MyEntity:1:2:3" and IIRC does not attempt to perform separator escaping for char ID values. Feel free to use it as is, or copy the code and create your own format.

Andrus


> On Dec 12, 2017, at 2:24 PM, Michael Gentry <bl...@gmail.com> wrote:
> 
> Hi Ken,
> 
> I had some code somewhere that did this, but can't find it offhand.
> 
> Nutshell version, I was storing the information in this format:
> 
> EntityName:KeyName:KeyValue
> 
> You can get that information from the Cayenne[1] (or DataObjectUtils if on
> 3.0) helper class.  That format requires a single PK and likewise a single
> integer PK value.
> 
> When I needed the object back, I split on the colons and used the parts to
> construct a new ObjectId(entityName, key, value) and passed that to
> Cayenne.objectForPK(context, objectId).
> 
> mrg
> 
> [1] http://cayenne.apache.org/docs/3.1/api/org/apache/cayenne/Cayenne.html
> 
> 
> 
> On Tue, Dec 12, 2017 at 1:44 PM, Ken Anderson <ke...@amphorainc.com>
> wrote:
> 
>> Everyone,
>> 
>> I’ve been looking around the Cayenne API, but have not been able to find a
>> way to serialize an object ID into a string, and then turn that string back
>> into an object ID or object.  What’s the best/right way to do this?  For
>> instance, if you want to store a reference to a database object in a text
>> file…
>> 
>> Thanks,
>> Ken
>> Confidentiality Notice: This e-mail and accompanying documents contain
>> confidential information intended for a specific individual and purpose.
>> This e-mailed information is private and protected by law. If you are not
>> the intended recipient, you are hereby notified that any disclosure,
>> copying, or distribution, or the taking of any action based on the contents
>> of this information, is strictly prohibited.
>> 

Re: URI for data object?

[Michael Gentry <bl...@gmail.com>]

Hi Ken,

I had some code somewhere that did this, but can't find it offhand.

Nutshell version, I was storing the information in this format:

EntityName:KeyName:KeyValue

You can get that information from the Cayenne[1] (or DataObjectUtils if on
3.0) helper class.  That format requires a single PK and likewise a single
integer PK value.

When I needed the object back, I split on the colons and used the parts to
construct a new ObjectId(entityName, key, value) and passed that to
Cayenne.objectForPK(context, objectId).

mrg

[1] http://cayenne.apache.org/docs/3.1/api/org/apache/cayenne/Cayenne.html



On Tue, Dec 12, 2017 at 1:44 PM, Ken Anderson <ke...@amphorainc.com>
wrote:

> Everyone,
>
> I’ve been looking around the Cayenne API, but have not been able to find a
> way to serialize an object ID into a string, and then turn that string back
> into an object ID or object.  What’s the best/right way to do this?  For
> instance, if you want to store a reference to a database object in a text
> file…
>
> Thanks,
> Ken
> Confidentiality Notice: This e-mail and accompanying documents contain
> confidential information intended for a specific individual and purpose.
> This e-mailed information is private and protected by law. If you are not
> the intended recipient, you are hereby notified that any disclosure,
> copying, or distribution, or the taking of any action based on the contents
> of this information, is strictly prohibited.
>