How to avoid implicit cross joins in JPA ?

How to avoid implicit cross joins in JPA ? When you join two tables and trying to select (column select) from the child table then you will come across this implicit cross join issues. For example we have two entities namely store, coupon and mapping follows, Store Entity: @Entity public class Store { @OneToMany(mappedBy = “store”) private List couponList; public

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Join two tables using Hibernate in Spring Boot Example

Join two tables using Hibernate in Spring Boot Example: Many enterprise applications whichever using hibernate uses sql queries only for joins still and uses hibernate only for save/update operations. Today we are going to see how to use hibernate to join two tables. We are going to see how to get count(*) using hibernate along with group by function in

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Spring Boot Native Query Example

Spring Boot Native Query Example: In Spring boot, database operations can be performed by implementing CrudRepository<Object, Long> in our @Repository interface. Here¬†Object is our entity class. @Query Annotation: We can execute nativeQueries using @Query annotation. Need to make the nativeQuery boolean to true and provide the native query to value parameter for @Query annotation.   Syntax: @Query(nativeQuery=true, value=”select s.store_name, s.store_url

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JPA Predicate criteriabuilder example for beginners

JPA Predicate criteriabuilder example for beginners Predicate is an interface which extends Expression and can be used for conjunction or disjunction of restrictions.   Syntax to create a predicate: Predicate someCondition = criteriaBuilder.equal(affiliateUrlRoot.get(“shop_home_url”), “mirthbees”);     criteriaBuilder is a CriteriaBuilder, which can be created like this,   @PersistenceContext private EntityManager entityManager; CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder(); affiliateUrlRoot is the root of

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Spring Boot with CriteriaBuilder for Dynamic Search Queries

Spring Boot with CriteriaBuilder for Dynamic Search Queries: Spring Boot with CriteriaBuilder for Dynamic Search Queries: When you are developing an enterprise application, you have to provide a search option dynamically with “and” condition. Our grand father way to do is using stringbuilder to construct the query in java and return the result. But hibernate has provided criteria for the

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[Solved] The type CriteriaQuery is not generic;

[Solved] The type CriteriaQuery is not generic; It is because of the incorrect import. CriteriaQuery is available in both hibernate and persistence package. We have to import from persistence package in order to use criteriabuilder. CriteriaQuery should be imported from import javax.persistence.criteria.CriteriaQuery;   not from import org.hibernate.criterion.CriteriaQuery;   Sample snippet: @PersistenceContextprivate EntityManager em; CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<AffiliateUrl> cq =

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How to use Set in Hibernate Example ?

How to use Set in Hibernate Example ?   Set is a collection which stores only unique values, if you like to store the duplicates then you can go with List. As we know creating a session factory is the mandatory basic one for any hibernate, creating a hibernate session factory now, package in.javadomain; import org.hibernate.HibernateException; import org.hibernate.SessionFactory; import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

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Difference between session and sessionfactory hibernate?

Difference between session and sessionfactory hibernate? Basically session will be created from the sessionfactory instances. I have listed down the few differences between the session and sessionfactory in hibernate. Sessionfactory: It is one instance per datasource/database. It is thread safe. It is a heavy weight object, because it maintains datasources, mappings, hibernate configuration information’s etc. Sessionfactory will create and manage

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Java Program with Hibernate is not terminating

Java Program with Hibernate is not terminating: In hibernate you would have created the hibernate session factory to open the session and work with the databases. In that case you will face the program not termination issue sometimes. Rootcause: Once the program execution finishes session and sessionfactory should be closed, When it is not closed then you may face Java

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How to set up Java Hibernate with MySQL in Eclipse ?

How to set up Java Hibernate with MySQL in Eclipse - featured image

Hibernate+MySQL+Java+Eclipse: How ? Today we are going to see how to integrate Hibernate with mysql in Java using Eclipse.   PreRequisite: 1. Ensure you have Eclipse Juno [you can also have some other version of eclipse, but we installed hibernate tools in eclipse Juno only. I would recommend you to download eclipse juno to install hibernate tools]. 2. Hibernate tools

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