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From David Jencks <david_jen...@yahoo.com>
Subject Re: [jira] Created: (OPENJPA-736) Combine insert and select SQL together when for generated Id with strategy=GenerationType.IDENTITY
Date Wed, 01 Oct 2008 17:11:51 GMT
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 (?, ?, ?, ?) )
>
>
> -- 
> This message is automatically generated by JIRA.
> -
> You can reply to this email to add a comment to the issue online.
>


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