[Hibernate-JIRA] Created: (HHH-5554) Customise column aliasing scheme
by Chris Pheby (JIRA)
Customise column aliasing scheme
--------------------------------
Key: HHH-5554
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5554
Project: Hibernate Core
Issue Type: Patch
Components: core
Affects Versions: 3.6.0.Beta4
Reporter: Chris Pheby
Attachments: alias-patch.patch
Currently, the column aliasing scheme is hardcoded in the method public String getAlias(Dialect dialect) of the Column class. Essentially, this constructs an alias by creating a prefix using any characters up to the first non-letter character in the column name. This is usually followed by '_' and a number for disambiguation.
I am working with a legacy database where many columns share common prefixes such as 'CUS_', 'COL_'. These mean all the aliases end up being the same for many columns, making queries difficult to debug.
This patch configures aliasing via Dialect, which was already being done for getMaxAliasLength(). This makes it possible to customise the behaviour by extending the Dialect being used. It does not otherwise change the standard behaviour.
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11 years, 11 months
[Hibernate-JIRA] Created: (HHH-3733) Introduce an annotation to disable ad-hoc null semantic of Hibernate components
by Vladimir Kovalyuk (JIRA)
Introduce an annotation to disable ad-hoc null semantic of Hibernate components
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Key: HHH-3733
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3733
Project: Hibernate Core
Issue Type: Improvement
Components: core
Reporter: Vladimir Kovalyuk
see http://forums.hibernate.org/viewtopic.php?t=993972
For the model
@Entity
public class Person {
private Address name = new Address();
...
@Embedded Address getAddress() {}
}
@Embeddable
public class Address {
public String getCity() {}
public String getStreet() {}
}
the following xhtml excerpt causes NPE constantly when editing a person which address properties hasn't been filled in yet
<h:inputText value="#{person.address.city}" />
I suggest introducing an annotation @Static which could be applied to Address class and lead to disabling null ad-hoc semantic on its instances.
For some environments such as user interface this may be considered as the default behavior. I suggest introducing an Hibernate configuration parameter which would switch off the semantic.
I would propose to consider embeddable classes as static mixins from OO design, not as just limited entities without identity. This point of view explains that embedded instance is a part of entity so it's lifecycle is the same as the entity's lifecycle. Thus constant presence of embeddable instance (property is never null) is the default behavior. Thus configuration parameter is "must have", not the thing which is "nice to have".
>From the other hand null ad-hoc semantic is like dynamic mixins. So it would be nice to have a @Dynamic annotation to force this semantic for some components.
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11 years, 11 months
[Hibernate-JIRA] Created: (HHH-2308) Adjusting the Outer Join Predicate using Criteria Query
by Ben Grant (JIRA)
Adjusting the Outer Join Predicate using Criteria Query
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Key: HHH-2308
URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2308
Project: Hibernate3
Type: New Feature
Components: query-criteria
Versions: 3.2.1
Environment: Linux Using MS SQLServer
Reporter: Ben Grant
I have two tables
Table A
||Col_1||Col_2||
|London| UK |
|Liverpool| UK |
| New York | USA |
Table B
||Col_1||Col_2|| Col_3||
| UK | Europe | 0
| USA | Americas | 1
Using the Criteria class, Restriction Class and FetchMode, Hibernate manages to create a query that looks like this
select distinct top 2000
this_.Col_1 as y0_, TableB3_.Col2 as y1_
from TableA this_
left outer join TableB TableB3_ on this_.Col_2= TableB3_.Col_1
where TableB3_.Col_3=1
When really i need the query to be like this
select distinct top 2000
this_.Col_1 as y0_, TableB3_.Col2 as y1_
from TableA this_
left outer join TableB TableB3_ on this_.Col_2= TableB3_.Col_1 AND TableB3_.Col_3=1
currently their isn't any know way for hibernate to adjust or apply filters within the join clause.
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11 years, 11 months