isn't there a db independent jdbc feature for this now?
thanks
david jencks
On Oct 1, 2008, at 9:29 AM, Fay Wang (JIRA) wrote:
> Combine insert and select SQL together when for generated Id with
> strategy=GenerationType.IDENTITY
> ----------------------------------------------------------------------------------------------------
>
> Key: OPENJPA-736
> URL: https://issues.apache.org/jira/browse/OPENJPA-736
> Project: OpenJPA
> Issue Type: Improvement
> Affects Versions: 1.3.0
> Reporter: Fay Wang
> Fix For: 1.3.0
>
>
> Currently if the strategy of the generated id is
> GenerationType.IDENTITY, when an entity object is created, openjpa
> will generate two SQL statements. The following is an example
> running on DB2:
>
> (1) INSERT INTO EntityA (col1, col2, col3, version) VALUES
> (?, ?, ?, ?)
> [params=(int) 1, (int) 1, (int) 1, (int) 1]
>
> (2) SELECT IDENTITY_VAL_LOCAL() FROM SYSIBM.SYSDUMMY1
>
> A performance improvement is to take advantage of the "select from
> final table" feature in DB2 to combine the insert and select
> statement into a single SQL statement as shown below:
>
> SELECT id FROM FINAL TABLE (INSERT INTO EntityA (col1, col2, col3,
> version) VALUES (?, ?, ?, ?) )
>
>
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