[Hibernate-JIRA] Created: (HHH-4042) StatelessSession does not flush when using jdbc batch_size > 1
by Gael Beaudoin (JIRA)
StatelessSession does not flush when using jdbc batch_size > 1
--------------------------------------------------------------
Key: HHH-4042
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4042
Project: Hibernate Core
Issue Type: Bug
Components: core
Affects Versions: 3.3.1
Environment: JBoss 4.2.3, Linux, java 1.6, hibernate 3.3.1, entityManager 3.4.0, jboss seam 2.1.2, postgresql 8.3
Reporter: Gael Beaudoin
I'm using a StetelessSession to insert millions of rows : it works great and without using much memory. But I've just seen that with a jdbc batch size of 50 for example (<property name="hibernate.jdbc.batch_size" value="0"/> in my persistence.xml) the last round of inserts aren't flushed to the database. For example, with 70 insert, only the first 50 are sent to the database.
I've searched a lot about this issues and on this thread (https://forum.hibernate.org/viewtopic.php?f=1&t=987882&start=0), the only solution found is to set the batch_size to 1, which is really a shame.
I've tried to flush the session, close the jdbc connection, etc etc ... no luck.
I'd be fine with a way to set the batch_size to 1 only for this method, pro grammatically, but I've not found any way to do that.
If you don't pay attention, it's a easy way to lose data.
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14 years, 2 months
[Hibernate-JIRA] Created: (HHH-2319) StatelessInterceptor
by Max Rydahl Andersen (JIRA)
StatelessInterceptor
--------------------
Key: HHH-2319
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2319
Project: Hibernate3
Type: New Feature
Components: core
Versions: 3.2.1
Reporter: Max Rydahl Andersen
It would make sense to have an Interceptor for StatelessSession to solve the following usecases:
Log/adjust SQL: onPrepareStatement
Proper entityname handling: instantiate/getEntity
Maybe also tx interaction: afterTransationBegin/beforeTransactionCompletion/afterTransactionCompletion
Technically it could be solved by just allowing to pass in a normal interceptor to a StatelessSession and just
document that the state oriented callbacks will not be called. Alternatively we can create a StatelessInterceptor that
only implement the releavant methods and wrap that instance into an internal Interceptor.
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14 years, 2 months
[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
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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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14 years, 2 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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14 years, 2 months