[Hibernate-JIRA] Created: (HHH-2007) Hibernate doesn't support optional one-to-one associations
by Andrei Iltchenko (JIRA)
Hibernate doesn't support optional one-to-one associations
----------------------------------------------------------
Key: HHH-2007
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2007
Project: Hibernate3
Type: Bug
Components: core
Versions: 3.2.0.cr2
Reporter: Andrei Iltchenko
Hibernate doesn't properly support optional one-to-one associations, e.g. Person (0..1) -- (0..1) Passport.
The Hibernate books and reference all talk of two ways of mapping one-to-one associations:
1. using a many-to-one fk association with a unique constraint on the fk;
2. using a pk association.
the trouble with both of them is that they enforce the mandatory property of an association end, which sometimes is not desirable. The first way enforces the mandatory property with the uniqueness constraint on the fk, the other by using the fact that one table's pk is its fk.
I tried to see if I could adapt the 1st way of representing one-to-ones to
support optional association ends. What I did was simply remove the unique and not null constrains from DDL generated (without removing it it would be impossible to have a Person record that doesn't reference a Passport record):
from
CREATE TABLE Person (
PassUniqueId VARCHAR (32) NOT NULL,
version INTEGER NOT NULL,
uniqueId VARCHAR (32) NOT NULL,
name VARCHAR (40) NULL,
PRIMARY KEY (uniqueId),
UNIQUE(PassUniqueId),
FOREIGN KEY (PassUniqueId) REFERENCES Passport (uniqueId)
);
to
CREATE TABLE Person (
PassUniqueId VARCHAR (32) NULL,
version INTEGER NOT NULL,
uniqueId VARCHAR (32) NOT NULL,
name VARCHAR (40) NULL,
PRIMARY KEY (uniqueId),
FOREIGN KEY (PassUniqueId) REFERENCES Passport (uniqueId)
);
but leave the uniqueness attribute in the mapping file:
<many-to-one
name="pass"
class="application.business.logic.Passport"
cascade="save-update,merge"
unique="true"
>
<column name="PassUniqueId"/>
</many-to-one>
The resulting solution worked fine and I was able to create instances of Person not linked to a Passport. However Hibernate didn't succed in keeping the association from degrading into a many-to-one. It enabled me to create two Persons linked with the same Passport:
PASSUNIQUEID | VIRSION | UNIQUEID | Name
================================================
0d8b3919fffff | 1 | 0d5fb1dcfff | John
0d8b3919fffff | 0 | 10fd07bdfff | Sam
A subsequent attempt at retrieving such Persons with Hibernate failed:
org.hibernate.HibernateException: More than one row with the given identifier was found: 0d8b3919ffffffd60151e135b6da0164, for class: application.business.logic.Passport.
Hibernate should be able to impose the single end property of such associations without relying on the underlying RDBMS engine and never allow them to degrade to many-to-ones.
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15 years, 6 months
[Hibernate-JIRA] Created: (HHH-4618) Support pagination: total rows ignore limit
by Dave (JIRA)
Support pagination: total rows ignore limit
-------------------------------------------
Key: HHH-4618
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4618
Project: Hibernate Core
Issue Type: New Feature
Components: core
Environment: JBoss 5.1.0GA
Reporter: Dave
Limit is used for pagination, but total number of rows must be known to calculate page count.
Currently we have to use two queries:
1. select * from Student where age<30 limit 20;
2. select count(*) from Student where age<30;
For complex query with joins/huge tables, it can be a performance issue.
For Criteria API query with group by, there is no way to get row count, for example
criteria.setProjection(Projection.projectionList().add(Projections.groupProperty("name")).add(Projections.sum(score)));
Currently there is no way to get row count of this query using Criteria API.
For MYSQL, SQL_CALC_FOUND_ROWS and FOUND_ROWS() are used to get row count ignoring limit.
Pagination is used for all web application. Hibernate should support it in HQL and Criteria API.
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15 years, 6 months
[Hibernate-JIRA] Created: (HHH-4072) ManyToMany with single table inheritance fails when multiple subclasses
by david sinclair (JIRA)
ManyToMany with single table inheritance fails when multiple subclasses
-----------------------------------------------------------------------
Key: HHH-4072
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4072
Project: Hibernate Core
Issue Type: Bug
Components: envers
Affects Versions: 3.3.2
Environment: Windows XP, Java 1.6
Reporter: david sinclair
Priority: Critical
I have a base entity named BusinessSoftwareMatrixElement declare as such
@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = "software_type", discriminatorType = DiscriminatorType.STRING)
@DiscriminatorValue("Software")
@Audited
BusinessSoftwareMatrixElement ...{ }
I then have a subclass of BusinessSoftwareMatrixElement that is a mapped super class which defines a many to many relationship.
@MappedSuperclass
@Audited
public abstract class BusinessOSProcessServiceMatrixElement extends BusinessSoftwareMatrixElement {
private Set<BusinessOSMatrixElement> applicableOperatingSystems = new HashSet<BusinessOSMatrixElement>();
@ManyToMany(fetch = FetchType.LAZY, cascade = {CascadeType.REMOVE, CascadeType.REFRESH }, targetEntity = BusinessOSMatrixElement.class)
@JoinTable(name="matrix_elements_procserv_aos",
joinColumns=@JoinColumn(name="sw_guid"),
inverseJoinColumns = @JoinColumn(name="os_guid"))
public Set<BusinessOSMatrixElement> getApplicableOperatingSystems() {
return applicableOperatingSystems;
}
}
There are then to subclasses that add no new fields, only different discriminators
@Entity
@DiscriminatorValue("Database")
@Audited
public class BusinessDBMatrixElement extends BusinessOSProcessServiceMatrixElement {
@Entity
@DiscriminatorValue("Application")
@Audited
public class BusinessAppMatrixElement extends BusinessOSProcessServiceMatrixElement {
Running the ant task to create the DDL results in an exception being thrown for that many to many table.
Caused by: org.hibernate.DuplicateMappingException: Duplicate class/entity mapping matrix_elements_procserv_aos_AUD
at org.hibernate.tool.ant.HibernateToolTask.reportException(HibernateToolTask.java:226)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:189)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:275)
at org.apache.tools.ant.Task.perform(Task.java:364)
at org.apache.tools.ant.Target.execute(Target.java:341)
at org.apache.maven.plugin.antrun.AbstractAntMojo.executeTasks(AbstractAntMojo.java:108)
... 24 more
Caused by: org.hibernate.DuplicateMappingException: Duplicate class/entity mapping matrix_elements_procserv_aos_AUD
at org.hibernate.cfg.Mappings.addClass(Mappings.java:141)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:167)
at org.hibernate.cfg.Configuration.add(Configuration.java:716)
at org.hibernate.cfg.AnnotationConfiguration.processArtifactsOfType(AnnotationConfiguration.java:531)
at org.hibernate.cfg.AnnotationConfiguration.secondPassCompile(AnnotationConfiguration.java:291)
at org.hibernate.cfg.Configuration.buildMappings(Configuration.java:1162)
at org.hibernate.envers.configuration.AuditConfiguration.getFor(AuditConfiguration.java:102)
at org.hibernate.envers.ant.AnnotationConfigurationTaskWithEnvers.doConfiguration(AnnotationConfigurationTaskWithEnvers.java:38)
at org.hibernate.tool.ant.ConfigurationTask.getConfiguration(ConfigurationTask.java:55)
at org.hibernate.tool.ant.HibernateToolTask.getConfiguration(HibernateToolTask.java:302)
at org.hibernate.tool.ant.Hbm2DDLExporterTask.createExporter(Hbm2DDLExporterTask.java:51)
at org.hibernate.tool.ant.ExporterTask.execute(ExporterTask.java:39)
at org.hibernate.tool.ant.HibernateToolTask.execute(HibernateToolTask.java:186)
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15 years, 6 months
[Hibernate-JIRA] Created: (HHH-2835) Setting org.hibernate.type logging to debug produces no logging
by Jeremy Grodberg (JIRA)
Setting org.hibernate.type logging to debug produces no logging
---------------------------------------------------------------
Key: HHH-2835
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2835
Project: Hibernate3
Issue Type: Bug
Components: core, documentation
Affects Versions: 3.2.5, 3.2.4
Environment: Hibernate 3.2.4.ga and Hibernate 3.2.5.ga with MySQL5Dialect (configured with Hibernate Annotations 3.3.0.ga and Spring 2.0.6)
Reporter: Jeremy Grodberg
Priority: Minor
According to the online documentation (labeled as version 3.2.2 at this moment), Table 3.9 "Hibernate Log Categories", as viewed here today:
http://www.hibernate.org/hib_docs/v3/reference/en/html/session-configurat...
Setting the log4j category "org.hibernate.type" to debug should "Log all JDBC parameters". However, it produces no output at all.
When I go on to set "org.hibernate" to debug, I get output like this:
DEBUG: org.hibernate.jdbc.AbstractBatcher - about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
DEBUG: org.hibernate.SQL - select count(*) from album where genreID=?
DEBUG: org.hibernate.loader.Loader - bindNamedParameters() 126 -> genreId [1]
DEBUG: org.hibernate.jdbc.AbstractBatcher - about to open ResultSet (open ResultSets: 0, globally: 0)
DEBUG: org.hibernate.loader.Loader - result row:
DEBUG: org.hibernate.jdbc.AbstractBatcher - about to close ResultSet (open ResultSets: 1, globally: 1)
DEBUG: org.hibernate.jdbc.AbstractBatcher - about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
Note that the JDBC parameters are logged under org.hibernate.loader but nothing appears under org.hibernate.type. FYI, genreId is, in this case, a Long.
Perhaps this is expected/desired when using annotations? If so, then please update the documentation. If not, please restore the logging.
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15 years, 6 months
[Hibernate-JIRA] Created: (HHH-2228) ant eg fails - bad release notes quick start
by Brian Brooks (JIRA)
ant eg fails - bad release notes quick start
--------------------------------------------
Key: HHH-2228
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2228
Project: Hibernate3
Type: Bug
Components: documentation
Versions: 3.2.0.ga
Environment: hibernate 3.2.0.ga
Microsoft Windows XP [Version 5.1.2600]
java version "1.5.0_07"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_07-b03)
Java HotSpot(TM) Client VM (build 1.5.0_07-b03, mixed mode)
Reporter: Brian Brooks
Priority: Minor
The hibernate 3.2.0.ga release notes
http://sourceforge.net/project/shownotes.php?release_id=455849&group_id=4...
read as
Get Up And Running Quick
------------------------
Demo:
(1) copy your JDBC driver to the lib directory
(2) edit etc/hibernate.properties
(3) run "ant eg" or "build eg"
(4) browse the sourcecode in eg/org/hibernate/auction
This directions are incorrect. Below is the ant output if these steps are followed. Also, I had to put junit*.jar and antlr*all*.jar in my ANT_HOME/lib before ant eg would work.
C:\hibernate-3.2>ant eg
Buildfile: build.xml
[taskdef] Could not load definitions from resource clovertasks. It could not b
e found.
eg:
[javac] Compiling 8 source files to C:\hibernate-3.2\build\eg
[javac] C:\hibernate-3.2\eg\org\hibernate\auction\Main.java:10: cannot find
symbol
[javac] symbol : class FetchMode
[javac] location: package org.hibernate
[javac] import org.hibernate.FetchMode;
[javac] ^
[javac] C:\hibernate-3.2\eg\org\hibernate\auction\Main.java:11: cannot find
symbol
[javac] symbol : class FlushMode
[javac] location: package org.hibernate
[javac] import org.hibernate.FlushMode;
[javac] ^
[javac] C:\hibernate-3.2\eg\org\hibernate\auction\Main.java:12: cannot find
symbol
[javac] symbol : class LockMode
[javac] location: package org.hibernate
[javac] import org.hibernate.LockMode;
[javac] ^
....
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15 years, 6 months