Another common issue is lazy loading. By default, JPA fetches relationships lazily, meaning it only fetches the related entities when you access them. This can lead to the N+1 select issue, where JPA executes an additional SQL query for each related entity. To mitigate this, you can use th...
Thejta-data-sourceelement indicates that the transactions in which the entity manager takes part are JTA transactions, meaning that transactions are managed by the container. Alternatively, you can use resource-local transactions, which are transactions controlled by the application itself. In general, ...
The JDO 3.2 annotations have now been upgraded (in javax.jdo v3.2.0-m6) to support the Java8 @Repeatable setting meaning that you can now do @Index(name="MYINDEX_1", members={"field1","field2"}) @Index(name="MYINDEX_2", members={"field3"}) public class Person { ... } The...
HibernateSpringBootTransactionalInRepository Best way to use @transactional Dec 20, 2019 HibernateSpringBootTransactionalReadOnlyMeaning HibernateSpringBootTransactionalReadOnlyMeaning What is Transactional(readOnly=true) Dec 14, 2019 HibernateSpringBootTwoDataSourceBuilderKickoff HibernateSpringBootTwoDataSourceBuilde...
Database relationships can be one-sided, meaning that only one entity knows about the other entity or entities in the relationship. Unidirectional relationships have an "owning" side, the side that maintains the relationship in the database. ...
java Starting the Cluster From a Hot Backup As mentioned in the previous section, hot backup process creates subdirectories namedbackup-<backupSeq>under the configuredhot backup directory(i.e.,backup-dir). When starting your cluster with data from a hot backup, you need to set thebase director...
We strongly object against persistence frameworks in their contemporary meaning. This includes a long row of names like Hibernate, Java Persistence API, LINQ, and others. Consider how one of them describes itself: ...high performance object/relational persistence and query service... lets you devel...
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This has 2 result expressions - field1, and field2 (where they are each a "PrimaryExpression" meaning a representation of a field). The query compilation of a particular clauses has 2 stages Compilation into a Node tree, with operations between the nodes ...
Data stored using this mechanism is intended to be a local copy of data stored on a remote server. The individual entries can be tagged as eithercached, meaning the server has an up-to-date copy,dirty, meaning the server does not have an up-to-date copy, ortemporary, meaning that the...