[Hibernate-JIRA] Created: (HHH-5306) Dialect resolution: Cannot set a custom dialect resolver programatically or using hibernate.cfg.xml
by Nikita D (JIRA)
Dialect resolution: Cannot set a custom dialect resolver programatically or using hibernate.cfg.xml
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Key: HHH-5306
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5306
Project: Hibernate Core
Issue Type: Bug
Components: core
Affects Versions: 3.5.2, 3.5.1, 3.5.0-Final, 3.5.0-CR-2, 3.5.0-CR-1, 3.5.0-Beta-4, 3.5.0-Beta-3, 3.5.0-Beta-2, 3.5.0.Beta-1, 3.3.2
Reporter: Nikita D
Priority: Minor
Starting with version 3.3, Hibernate introduced an extremely useful dialect resolution feature (http://docs.jboss.org/hibernate/stable/core/reference/en/html_single/#por...). The problem is with the configuration of a custom dialect resolver:
* Setting the property Environment.DIALECT_RESOLVERS in the Configuration of a SessionFactory doesn't work, because DialectFactory only reads from Environment.getProperties(), which is only the global properties (system properties plus the hibernate.properties file).
* Setting a system property programatically is not safe, because the Environment class caches the system properties in a static constant, so if it's loaded before the code that sets the system property, the property will not be picked up.
* The registerDialectResolver() method on DialectFactory is not public.
Ideally, it should be possible to configure a custom dialect resolver by setting the property Environment.DIALECT_RESOLVERS on a Configuration object, just as one would configure an explicit dialect. Alternatively, I think an acceptable "quick fix" would be to expose the registerDialectResolver() method on DialectFactory.
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13 years, 4 months
[Hibernate-JIRA] Created: (HHH-4630) Criteria join on composite identifier generates wrong alias, SQL error
by Chris Wilson (JIRA)
Criteria join on composite identifier generates wrong alias, SQL error
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Key: HHH-4630
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4630
Project: Hibernate Core
Issue Type: Patch
Components: core
Affects Versions: 3.5
Environment: Hibernate trunk from 2009-11-30, Ubuntu 8.04, Sun Java 1.6.0-17, MySQL 5.0.51a-3ubuntu5.4
Reporter: Chris Wilson
Attachments: hibernate-invalid-alias-generation.patch
Hibernate generates the wrong alias on a Criteria query involving a join
on a composite identifier. For example, in the test below without the fix
to JoinWalker, it generates this SQL:
select
this_.role_code as role1_0_1_,
this_.is_deleted as is2_0_1_,
this_.record_version as record3_0_1_,
complexjoi3_.code as code1_0_,
complexjoi3_.is_deleted as is2_1_0_,
complexjoi3_.record_version as record3_1_0_
from
list_action_roles this_
left outer join
roles complexjoi3_
on this_.role_code=complexjoi3_.code
where
this_.is_deleted=?
and complexjoi1_.is_deleted=?
Which results in this error from the SQL server:
Unknown column 'complexjoi1_.is_deleted' in 'where clause'
Analysis of the problem:
The entity persister class with the composite identifier has a fake
property for it, called "_identifierMapper" (see HbmBinder.bindCompositeId()
and similarly in Annotations). This property name ends up in the path
used by JoinWalker.walkEntityTree() when it calls walkComponentTree().
However that path is used by CriteriaJoinWalker.generateTableAlias()
to look up the correct criteria (and hence the alias) from the
translator, a CriteriaQueryTranslator.
The alias was created in CriteriaQueryTranslator.createCriteriaSQLAliasMap
for a Criteria without this extra _identifierMapper path component.
So when CriteriaJoinWalker tries to use the path with _identifierMapper
to look up the criteria to find the correct alias to use, in
generateTableAlias(), it doesn't find one, so it generates a new alias.
That new alias no longer matches the one that will be rendered out in
the WHERE clause, so the WHERE clause will refer to table names using
aliases that are not used anywhere else in the query, and the SQL server
will fail to parse the statement.
The solution appears to be to exclude "_identifierMapper" components in
the alias path when building it. I don't know what other implications
that might have, but it seems like an implementation nastiness that
shouldn't be exposed.
Patch attached.
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13 years, 4 months
[Hibernate-JIRA] Created: (HSEARCH-210) Support hbm xml mapping!
by Mark Stewart (JIRA)
Support hbm xml mapping!
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Key: HSEARCH-210
URL: http://opensource.atlassian.com/projects/hibernate/browse/HSEARCH-210
Project: Hibernate Search
Issue Type: Bug
Components: mapping
Affects Versions: 3.0.1.GA
Environment: All.
Reporter: Mark Stewart
I like annotations as much as the next guy but it's a complete non-starter for our business (and, I suspect, plenty of others) to add full text search to our existing apps via Hibernate Search if it means we must convert all our existing hbm.xml configurations into annotations. The regression testing alone would kill us.
The Hibernate project has always been supremely pragmatic which is why I've filed this as a bug rather than a feature request. I don't think Hibernate would have been half as popular if it didn't support things like direct SQL and reverse engineering tools. I think Search would see a big boost if it could be easily added to existing applications.
Please consider adding the needed syntax for xml mapping. At the very least an entry in the FAQ that explains the lacking is needed.
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13 years, 4 months
[Hibernate-JIRA] Created: (HHH-3031) Include "FOR READ ONLY" hint in non-locking DB2 statements
by Steve Finch (JIRA)
Include "FOR READ ONLY" hint in non-locking DB2 statements
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Key: HHH-3031
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3031
Project: Hibernate3
Issue Type: Improvement
Components: core
Affects Versions: 3.2.5
Environment: 3.2.5, DB2/UDB 8.1+
Reporter: Steve Finch
As per the DB2 documentation:
http://publib.boulder.ibm.com/infocenter/db2luw/v8/index.jsp?topic=/com.i...
The FOR READ ONLY clause indicates that the result table is read-only and therefore the cursor cannot be referred to in Positioned UPDATE and DELETE statements. FOR FETCH ONLY has the same meaning.
For result tables in which updates and deletes are allowed, specifying FOR READ ONLY (or FOR FETCH ONLY) can possibly improve the performance of FETCH operations by allowing the database manager to do blocking. For example, in programs that contain dynamic SQL statements without the FOR READ ONLY or ORDER BY clause, the database manager might open cursors as if the FOR UPDATE clause were specified. It is recommended, therefore, that the FOR READ ONLY clause be used to improve performance, except in cases where queries will be used in positioned UPDATE or DELETE statements.
A read-only result table must not be referred to in a Positioned UPDATE or DELETE statement, whether it is read-only by nature or specified as FOR READ ONLY (FOR FETCH ONLY).
The aforementioned improvement can be achieved by applying "FOR READ ONLY" when other locking hints are not specified.
Patch to be uploaded soon.
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13 years, 4 months