Re: Creating a EOModel in code
Re: Creating a EOModel in code
- Subject: Re: Creating a EOModel in code
- From: Hugi Thordarson via Webobjects-dev <email@hidden>
- Date: Fri, 26 Jun 2020 19:41:14 +0000
The APIs and syntax vary a bit in names but philosophically and design-wise
it's very much the same. EOModeler will not work, there's a different tool
called "Cayenne modeler", a standalone app.
My primary DBs are MySQL and Postgres, both work fine with Cayenne. It's an
established tool to say the least. I've been using it for a few years now and
interestingly enough, I don't recall encountering a bug (even if I'm still
always using snapshot releases)
- hugi
> On 26 Jun 2020, at 19:32, Jesse Tayler <email@hidden> wrote:
>
>
> so, my simple EOF/ERXKey qualifiers and stuff would work, I’d use EOModeler?
>
> MySQL works fine it sounds, I’m using AWS stuff myself…
>
>
>
>> On Jun 26, 2020, at 3:27 PM, Hugi Thordarson <email@hidden> wrote:
>>
>>> Ok, so are all the cool guys using Cayenne now then?
>>
>> I've seen some pretty cool guys use it but I also use it.
>>
>>
>>> I'm sure I should read some page about it rather than waste everyone’s time
>>> reiterating why it’s better and why we should be moving to that sort of
>>> thing etc.
>>
>> It's awesome in so many ways. But for people that already know EOF, it's
>> probably best described as "EOF without that darned locking thing". And
>> there's seriously exciting stuff happening in the most recent releases
>> (subqueries, SQL-functions and more, all type safe using "Properties", the
>> Cayenne version of ERXKey.
>>
>> API-wise it can pretty much be a drop-in replacement for EOF and from
>> experience I can say there's nothing to lose and much to gain. (assuming
>> you're using an SQL db. Cayenne is explicitly an SQL DB framework, not a
>> "generic everything framework" like EOF wants to be).
>>
>> - hugi
>>
>>
>>>> On Jun 26, 2020, at 3:10 PM, Hugi Thordarson via Webobjects-dev
>>>> <email@hidden> wrote:
>>>>
>>>> You might also want to take a look at Cayenne. It's well documented and
>>>> we're eager to help where the docs fall short. And most importantly; it's
>>>> an active and maintained project that didn't die over a decade ago :)
>>>>
>>>> - hugi
>>>>
>>>>
>>>>
>>>>> On 26 Jun 2020, at 19:04, Aaron Rosenzweig via Webobjects-dev
>>>>> <email@hidden> wrote:
>>>>>
>>>>> Hi Don,
>>>>>
>>>>> Have a look at EOEntity and friends: EOAttribute, EORelationship.
>>>>>
>>>>> You can build them out and setup the “external” name for the column, etc.
>>>>> I did it once as an exercise many moons ago. The only practical use I got
>>>>> out of it was sometimes sanity checking keyPaths to see if they hit
>>>>> things “in memory” or if they were completely traversable through
>>>>> EOEntity relationships. Something that trips an in-memory method call is
>>>>> not something you can use to build a complex SQL query.
>>>>>
>>>>> Like other people have said, the “reverse engineering” of the original WO
>>>>> tools is more likely what you want to use instead. You point Entity
>>>>> Modeler at a database and it can make a surprisingly good model file from
>>>>> it. Depending on how big the database is… it might be worth your trouble
>>>>> of firing up MacOS Tiger and installing the NeXTStep GUI tools to do the
>>>>> reverse engineering. I don’t think that the Eclipse java based
>>>>> EntityModeler can reverse engineer. I don’t know if Cayenne can reverse
>>>>> engineer.
>>>>> AARON ROSENZWEIG / Chat 'n Bike
>>>>> e: email@hidden t: (301) 956-2319
>>>>>
>>>>>
>>>>>> On Jun 25, 2020, at 8:53 PM, Don Lindsay via Webobjects-dev
>>>>>> <email@hidden> wrote:
>>>>>>
>>>>>> Hello;
>>>>>>
>>>>>> The Documentation for EOModel states that you can build one in code, but
>>>>>> there are no examples or further information that I can find. Does
>>>>>> anyone have any documentation or samples that they can direct me to so I
>>>>>> can create EOModels while the application is running:
>>>>>>
>>>>>> What I want to do is connect to a database that my app does not know
>>>>>> about, someone provides connection parameters and I create an EOModel
>>>>>> and connect to that database or rest and access it using the EOModel
>>>>>> created using new EOModel().
>>>>>>
>>>>>> Thanks
>>>>>>
>>>>>> Don
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>
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