Re: [eclipselink-dev] bug 340329 - table creation prefix

[James Sutherland <JAMES.SUTHERLAND@xxxxxxxxxx>]

At some point I think it would be nice to have an @DDL annotation to allow the user to give whatever DDL they want for an Entity (tables spaces, storage, constraints, indexes, procedures, etc.).


-----Original Message-----
From: Tom Ware 
Sent: Monday, March 28, 2011 1:29 PM
To: Dev mailing list for Eclipse Persistence Services
Cc: Singer, Reiner
Subject: Re: [eclipselink-dev] bug 340329 - table creation prefix

Hi Adrian,

   I'd like to hear what other committers think but I think my preference is to
specify this as a "table creation modifier" or some such thing. (your infix
suggestion)

   Unless we can think of a case where we would not have both the "CREATE" and
"TABLE" strings, I think it would be cleaner to avoid requiring they be specified.

   We thought about the delegation model you suggest below.  The weakness is, of
course, that it requires a code change to deal with any property that might be
passed in.  (i.e. if MySQL added a new modifier other than INNODB, we'd have to
actually change the MySQLPlatform to support it).  So far, the features that are
addressed with the suffix are fairly obscure, so we thought it would be better
to leave it free form.  I am, however open to arguments the other way.

-Tom

Goerler, Adrian wrote:
> Hi Tom,
>
> yes, a "prefix" as propsed in the patch would substitute "CREATE TABLE". I agree that "prefix" does not appear to be the right terminology. "createTableStatement" isn't either as its only the first part of the statement. Maybe "createTableKeywords" would be better or "createTableStatementHeader".
>
> It is an SAP-specific future feature we would like leverage, which allows to control some storage parameters of a table. The actual Syntax has the structure "CREATE <modifier> TABLE". Hence specifying the <modifier> as an "infix" would also be OK.
>
> Still, I am afraid that this (prefix/suffix) opens a small can of worms and it might be cleaner to delegate writeCreateTable to the platform as scetched out below.
>
>
> -Adrian
>
>
>
> Adrian Görler
> SAP AG
>
> Pflichtangaben/Mandatory Disclosure Statements:
> http://www.sap.com/company/legal/impressum.epx
>
>
> -----Original Message-----
> From: eclipselink-dev-bounces@xxxxxxxxxxx [mailto:eclipselink-dev-bounces@xxxxxxxxxxx] On Behalf Of Tom Ware
> Sent: Montag, 28. März 2011 16:55
> To: Dev mailing list for Eclipse Persistence Services
> Cc: Xiang, Xu; Singer, Reiner
> Subject: Re: [eclipselink-dev] bug 340329 - table creation prefix
>
> What would a typical prefix be?  (is it really a prefix, or a replacement for
> "CREATE TABLE"?  Is PREFIX the right terminology?)
>
> When would someone choose to use a prefix?  Is this a MAXDB specific thing?
>
> -Tom
>
> Goerler, Adrian wrote:
>> Hi Chris, others,
>>
>> 
>>
>> https://bugs.eclipse.org/bugs/show_bug.cgi?id=340329
>>
>> 
>>
>> we got the requirement to allow overriding the CREATE TABLE keywords in
>> DDL in a table-specific way to leverage special database features. Xu
>> has proposed to introduce a creation-prefix attribute to the
>> table-mappings of eclipselink-orm.xml - analogously to
>> https://bugs.eclipse.org/bugs/show_bug.cgi?id=214519. Please find
>> attached a revised proposal including test for this enhancement.
>>
>> 
>>
>> I you are OK with this feature, I would go ahead and check it in.
>>
>> 
>>
>> -Adrian
>>
>> 
>>
>> PS.
>>
>> 
>>
>> Alternatively, I could consider to specify additional requirements on
>> the DDL using @Properties/@Property annotations. Then, one could add
>>  hese properties to the TableDefinition, redirect rendering of CREATE
>> TABLE statements to the DatabasePlatform and render the statement in a
>> database-vendor specific way according to the properties recognized by
>> the vendor.
>>
>> 
>>
>> E.g.:
>>
>> 
>>
>> 
>>
>> @Table(name="MY_TABLE")
>>
>> @Property("mysql.jdbc.engine", "InnoDB")
>>
>> @Entity
>>
>> Public class MyEntity
>>
>> 
>>
>> This, however, would obsolete the creation-suffix just introduced in 2.2
>> ;-).
>>
>> 
>>
>> 
>>
>> 
>>
>> *Adrian Görler
>> **SAP AG
>>
>> *Pflichtangaben/Mandatory Disclosure Statements:
>> http://www.sap.com/company/legal/impressum.epx
>>
>> 
>>
>>
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>>
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