Identifier generator optimization". The manual does not talk about all the available optimizers. Sounds like the one you want is called "pooled-lo", which is just like "pooled", but stores the lo value rather than the high value. As indicated by Steve Ebersole, you should used "pooled-lo" optimizer in your case. To give some explanation, with pooled-lo optimizer, the value stored in the database is the low value of the next interval available.
So if the id of the last entity persisted is in [1;10], the next interval available is [11,20] and the value stored What Do You Want - Various - The Hardextant III - Hibernal Conflagration (CD) database will be 11, as you were expecting.
Thus if you have another program that don't use hibernate and is not even aware of the increment size defined in hibernate configuration, it will still be able to insert entities without breaking the sequence. All it will have to do is to atomically get the sequence value and increment it, and then use the value retrieve before the "incrementation" as the new entity id it wants to insert.
In our example in order to insert one What Do You Want - Various - The Hardextant III - Hibernal Conflagration (CD), it will update the What Do You Want - Various - The Hardextant III - Hibernal Conflagration (CD) value to 12 and add the new entity with the id Thus when hibernate will reach the last id of its current interval in memory 10it will query the database and store the value 22 in order to keep for it self the new interval of id [12;21].
Learn more. Enhanced identifier generators Ask Question. Asked 8 years, 8 months ago. Active 3 years, 6 months ago. Viewed 3k times. I decided to make use of a Hibernate id generator which meet the following requirements: - safe id generation when the domain is accessed from different applications different JVMs - make use of id intervals do not query the database every time a new ID is needed After some investigations I choose one of 2 hibernate enhanced identifier generators, it's the org.
Bax Bax 3, 3 3 gold badges 30 30 silver badges 55 55 bronze badges. There should only be one entity mapping to a specific table. Inheritance uses generator defined on the root entity, so that's not really a valid one. Active Oldest Votes. Without more details, I can't give a more precise answer but the above link should be helpful.
See also: Section 5. Column and formula elements Hibernate Core documentation Section 2. Formula Hibernate Annotations documentation. Ask 2, What Do You Want - Various - The Hardextant III - Hibernal Conflagration (CD), 1 1 gold badge 13 13 silver badges 22 22 bronze badges.
Pascal Thivent Pascal Thivent k gold badges silver badges bronze badges. Thanks What Do You Want - Various - The Hardextant III - Hibernal Conflagration (CD). Do you have any idea why the following is not working? The mapping seems OK: main org. Ejb3Column - binding formula select count blah blah blah But countInternal remains set to its initial value -1 : I have tried using field annotations instead of getter annotations, but it still does not work. Thanks, it really helped me a lot with my task!
Just learned how important it is to have the parentheses around the query. Always ended up with an SQL Exception, since this query of course becomes a subquery when the host object is loaded. MySQL did not like the inline select without parentheses. The new link to the article is: blog. Vlad Mihalcea Vlad Mihalcea I updated the answer so now you have a solution for more complex queries too. Here is an example mapping EntityView Order. Q 4 - Which method is used to update the state of the given instance from the underlying database?
Since Hibernate 3, lazy loading is by default, enabled so that child objects are not loaded when parent is loaded. Second level cache is an optional cache and first-level cache will always be consulted before any attempt is made to locate an object in the second-level cache. B - Use this strategy for read-mostly data where it is critical to prevent stale data in concurrent transactions.
C - Use this strategy if data hardly ever changes and a small likelihood of stale data is not of critical concern. Read-only concurrency strategy is suitable for data which never changes. Use it for reference data only. A - The Table annotation allows to specify the details of the table that will be used to persist the entity in the database. B - The Table annotation allows to override the name of the table, its catalogue, and its schema, and enforce unique constraints on columns in the table.
The Table annotation allows you to specify the details of the table that will be used to persist the entity in the database. The Table annotation provides four attributes, allowing you to override the name of the table, its catalogue, and its schema, and enforce unique constraints on What Do You Want - Various - The Hardextant III - Hibernal Conflagration (CD) in the table. Hibernate Online Quiz Advertisements.
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