Hibernate Manytomany The Join Table Has Sequence Generated Primary Key
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- Hibernate Manytomany The Join Table Has Sequence Generated Primary Keys
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- Hibernate Manytomany The Join Table Has Sequence Generated Primary Key Mean
Nov 06, 2017 Today, I will show you how to generate unique primary key values with JPA and Hibernate. But before we start, I want to know how you get the primary key values in. Oct 28, 2018 In this example, we've also set an initial value for the sequence, which means the primary key generation will start at 4. SEQUENCE is the generation type recommended by the Hibernate documentation. The generated values are unique per sequence. If you don't specify a sequence name, Hibernate will re-use the same hibernatesequence for different. Jun 23, 2009 Re: JPA, Hibernate: Custom primary key generator, before persist 843859 Jun 22, 2009 2:34 PM ( in response to Tolls ) So, you want to generate the barcode on the document, but ensure that the code is unique (ie using the database to keep track of the id possibly). After letting Hibernate generate the tables for MySQL it appears that the ManyToMany relationship table does not contain primary keys for the two foreign keys. This allows duplicate records in the many-to-many table, which is not the desired result. Tables generated.
posted 14 years agoHaving said that, it is better to use a surrogate key for the primary key to protect against business semantics changes in the natural key. So why not use a generated id?
Hibernate annotations with composite primary key I want to know how to use hibernate annotations in case of composite primary key in one table. I tried like this, I have created a table without primary key. Secondary-table: defines a secondary table very much like a regular table except that you can define the primary key / foreign key column(s) through the primary-key-join-column element. On non metadata complete, annotation secondary tables are used only if there is no secondary-table definition, annotations are ignored otherwise. Aug 01, 2016 One of my readers asked me to help him map a Composite Primary Key using JPA and Hibernate. Because this is a recurrent question, I decided to write a blog post in which I describe this mapping is more detail. Domain Model. A relational database composite key contains two or more columns which together for the primary key of a given table.
posted 14 years agoHowever, if you cannot change the data model, you can map the entire table as one big composite key. A horrible solution, but a work around which gives you time to fire the DBA who modelled your data this way, and hire a competent replacement.
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Originally posted by Ehrenfrids:
I have a table which has no primary key. How to create the hibernate mapping xml without using the generator id
How are you accessing records in that table when not using Hibernate? i.e. when you use SQL directly.
So: I can't add surogate key (I can't change the database) and I don't have a natural (business) key.
What about that?
Originally posted by Ionescu Victor:
The problem might not be so simple to adress. Suppose I work with a legacy database and I have a readonly table (imported from a back-office) and I don't want to access individual rows in that table (I want just to list the records obtained form a join).
So: I can't add surogate key (I can't change the database) and I don't have a natural (business) key.
What about that?
See my earlier answer. That's the only work around you have available to you.
I'm no expert on Hibernate but this should be easy
An Object-Relational Mapping tool can only be expected to map relational data. Data without a primary key it is not relational, so it should be no surprise it doesn't work.
You could use a named query to insert data instead of declaring an entity, and perform the insert from the dao.