| The jOOQ User Manual. Multiple Pages : SQL building : The DSLContext class : Custom Settings : Updatable Primary Keys | previous : next |
All versions: 3.11 | 3.10 | 3.9 | 3.8 | 3.7 | Development versions: 3.12 | Unsupported versions: 3.6 | 3.5 | 3.4 | 3.3 | 3.2
Updatable Primary Keys
In most database design guidelines, primary key values are expected to never change - an assumption that is essential to a normalised database.
As always, there are exceptions to these rules, and users may wish to allow for updatable primary key values in the updatable records feature (note: any value can always be updated through ordinary update statements). An example:
AuthorRecord author = DSL.using(configuration) // This configuration will be attached to any record produced by the below query. .selectFrom(AUTHOR) .where(AUTHOR.ID.eq(1)) .fetchOne(); author.setId(2); author.store(); // The behaviour of this store call is governed by the updatablePrimaryKeys flag
The above store call depends on the value of the updatablePrimaryKeys flag:
-
false(the default): Since immutability of primary keys is assumed, the store call will create a new record (a copy) with the new primary key value. -
true: Since mutablity of primary keys is allowed, the store call will change the primary key value from1to2.
Programmatic configuration
Settings settings = new Settings()
.withUpdatablePrimaryKeys(true); // Defaults to false
XML configuration
<settings xmlns="http://www.jooq.org/xsd/jooq-runtime-3.9.0.xsd"> <updatablePrimaryKeys>true</updatablePrimaryKeys> </settings>
