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From "Fay Wang (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-736) Combine insert and select SQL together when for generated Id with strategy=GenerationType.IDENTITY
Date Wed, 01 Oct 2008 16:29:44 GMT
Combine insert and select SQL together when  for generated Id with strategy=GenerationType.IDENTITY

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                 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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