[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-6125) Hibernate Criteria.setLockMode have unexpected behaviour when used in conjunction with MySQL
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https://hibernate.onjira.com/browse/HHH-6125?page=com.atlassian.jira.plug...
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Darryl Miles commented on HHH-6125:
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I too have found this problem when inspecting the SQL output of show_sql=true
I altered my pom.xml of my application provide to wind back the Hibernate versions and
found that this is became broken in 3.5.0-Final and last worked in 3.3.2.GA of
hibernate-core. When I wound the version back core=3.3.2.GA, so added
annotations=3.3.1.GA and entitymanager=3.3.2.GA and I see "select ... for
update" in the show_sql=true output.
I did not test 3.4.x as I did not find it in Maven.
I believe Scott Marlow did some work to deprecate LockMode.UPGRADE and introduce some
extra new modes at around this time, so that more fine-grained behavior could be provided.
This change set appeared to break support completely.
Hibernate Criteria.setLockMode have unexpected behaviour when used in
conjunction with MySQL
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Key: HHH-6125
URL: https://hibernate.onjira.com/browse/HHH-6125
Project: Hibernate ORM
Issue Type: Bug
Components: core
Affects Versions: 3.6.2
Environment: Hibernate 3.6.2, MySql 5.1
Reporter: Eric Poitras
Priority: Minor
Attachments: TestHibernate.java
You expect hibernate to issue a select ... for update when issuing a Criteria of this
form:
// This fails
Criteria c = s.createCriteria(SampleEntity.class);
c.setLockMode( LockMode.PESSIMISTIC_WRITE );
SampleEntity e = (SampleEntity) c.uniqueResult();
But the MySQL dialect class simply ignore the lock mode per alias since MySQL does not
support a per-table locking strategy. However, in the previous case,
it should issue a for update since we access ALL query tables in update.
Also, since pessimistic lock may be critical for some process synchronization, it should
AT LEAST not silently fail.
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