Re: DB2 Plugin SQL Generation
Re: DB2 Plugin SQL Generation
- Subject: Re: DB2 Plugin SQL Generation
- From: Chuck Hill <email@hidden>
- Date: Wed, 20 Apr 2011 11:31:22 -0700
Hi Jeffrey,
On Apr 20, 2011, at 11:13 AM, Jeffrey Simpson wrote:
> Thanks for the responses from my previous email DB2 Plugin testing.
>
> I am working on the SQL Generation and so I looked at the sql generated from the MySql Plugin and the Postgress plugin. I have a question related to PK generation support. Here is a sample of the generated sql:
>
> CREATE SEQUENCE Employee_seq;
>
> CREATE TEMP TABLE EOF_TMP_TABLE AS SELECT SETVAL('Employee_seq', (SELECT MAX(id) FROM Employee));
>
> DROP TABLE EOF_TMP_TABLE;
>
> ALTER TABLE Employee ALTER COLUMN id SET DEFAULT nextval( 'Employee_seq' );
>
> In the Create table and alter table scripts there is are 2 function calls setval and nextval. Are these user defined functions? If they are are there any examples?
I think those are db specific. You need to figure out what you want it to emit for DB2, then look at com.webobjects.eoaccess.synchronization.EOSchemaSynchronizationFactory
You will want a sub-class of this in your plugin, see public EOSchemaSynchronizationFactory createSchemaSynchronizationFactory() in JDCBPlugin. You can override the methods to produce appropriate SQL for DB2.
Chuck
--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their overall knowledge of WebObjects or who are trying to solve specific problems.
http://www.global-village.net/products/practical_webobjects
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