Find centralized, trusted content and collaborate around the technologies you use most. Connect and share knowledge within a single location that is structured and easy to search. THe problem we have currently is, if multiple users take action in front-end, some of them are getting duplicate numbers.
We are working on fixing this now, so later we can implement a sequence and are assured that the numbers are unique. How can I ensure that when I am updating the row, other users are waiting till the row is updated. I tried LockMode. Both methods are in DAO, which has Transactional annotation, and annotation present in service layer as well. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow.
Learn more. Hibernate : Lock a row while update, so user's don't retrieve a counter from it Ask Question. Asked 4 years, 9 months ago. Active 4 years, 9 months ago. Active 6 months ago. Viewed 20k times. Is there any way to skip locked records using pure JPA? Can I implement my own locking policy? Dominik Kunicki. Dominik Kunicki Dominik Kunicki 1 1 gold badge 12 12 silver badges 34 34 bronze badges. Maybe this helps - blogs. That is really not how JPA is intended to be used.
Locking entire tables is a scalability killer. Maybe re-think what it is you are trying to accomplish with this. I agree, I'm not locking entire table, this select was an example. I use this approach to avoid locking entire table. I lock subset of the data that is intended to be updated next. I want to ignore already locked records because if the other process picked it up they are not longer relevant for updating.
You can probably get it done using a custom Dialect for Hibernate, there should be a similar feature for EclipseLink , but you would still need to communicate that you want a specific query to use the feature. Defaults to true, but you can set it to false if the database column is defined with a default value of 0. Timestamp Timestamps are a less reliable way of optimistic locking than version numbers, but can be used by applications for other purposes as well. However, database-derived timestamps are safer to use in a clustered environment.
Others may also be unsafe for locking, because of lack of precision. Pessimistic Concurrent transactions conflict with each other Concurrent transactions require resources to be locked Typically, you only need to specify an isolation level for the JDBC connections and let the database handle locking issues.
The available lock modes from LockMode class are as follows: LockMode. READ : A read lock is acquired automatically and occurs on the object.
The explicit user request mentioned above occurs as a consequence of any of the following actions: A call to Session. A call to Session. A call to Query. Leave a Reply Cancel reply Your email address will not be published. Search for:. Collectives on Stack Overflow. Learn more. Asked 3 years, 8 months ago. Active 3 years, 8 months ago. Viewed 4k times. Is there a option to execute the "select for update" in only one request?
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