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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