Question about CMP Entity Bean key generation

[David Carew <dc...@gmail.com>]

I'm trying to do this in DB2 . I found an example of a deployment plan in
Aaron Mulder's book but I don't recognize  this particular SQL dialect.

<key-generator> <sql-generator> <sql>select nextval('person_seq')</sql>
<return-type>java.lang.Integer</return-type> </sql-generator>


Will the container use the contents of <sql> in the Values clause of an
INSERT statement like this

e.g. insert into foo values (contents of <sql>,....)

or will it execute the contents of <sql> as a separate statement and expect
it to return a single value of the appropriate type ? In DB2 this would be

 select (nextval for mysequence) from sysibm.sysdummy1

>From the example in the book I would guess the latter approach is what is
expected but I just wanted to verify this.

Re: Question about CMP Entity Bean key generation

[Aaron Mulder <am...@alumni.princeton.edu>]

It executes the SQL separately to get the ID, and then does an insert
with that ID.  The example used PostgreSQL syntax.

Thanks,
    Aaron

On 2/22/06, David Carew <dc...@gmail.com> wrote:
> I'm trying to do this in DB2 . I found an example of a deployment plan in
> Aaron Mulder's book but I don't recognize  this particular SQL dialect.
>
>  <key-generator> <sql-generator> <sql>select nextval('person_seq')</sql>
> <return-type>java.lang.Integer</return-type> </sql-generator>
>
>
> Will the container use the contents of <sql> in the Values clause of an
> INSERT statement like this
>
> e.g. insert into foo values (contents of <sql>,....)
>
> or will it execute the contents of <sql> as a separate statement and expect
> it to return a single value of the appropriate type ? In DB2 this would be
>
>  select (nextval for mysequence) from sysibm.sysdummy1
>
> From the example in the book I would guess the latter approach is what is
> expected but I just wanted to verify this.
>