How set distinct in Hibernate criteria?
Table of Contents
How set distinct in Hibernate criteria?
Use Projections. distinct. Criteria crit = session. createCriteria(Test….
- Can you add more information on why it worked for you?
- Great answer, worked for my case as well in only 1 additional line (instead of 10…)
- This is pretty limited solution.
- In my case, when I need to fetch details in outer join, it works perfect.
How can I get specific column in Hibernate?
Linked
- JPA alternative of Hibernate Projections.property.
- other queries are executing if native query is called in jpa.
- Modifying the generated SQL in hibernate.
- Hibernate: Select all from one table only instead of 3 joined tables.
- Get only selected columns from table in object using hibernate.
Is Hibernate criteria deprecated?
The Criteria API allows us to build up a criteria query object programmatically, where we can apply different kinds of filtration rules and logical conditions. Since Hibernate 5.2, the Hibernate Criteria API is deprecated, and new development is focused on the JPA Criteria API.
Can we use distinct in HQL query?
Using distinct in the HQL Query We can notice that the distinct keyword was not only used by Hibernate but also included in the SQL query. We should avoid this because it’s unnecessary and will cause performance issues.
Can we use distinct in JPQL?
You can add the DISTINCT keyword to your query to tell Hibernate to return each Author entity only once. But as you can see in the following log messages, Hibernate also adds the DISTINCT keyword to the SQL query.
How do I select a single column in HQL?
In HQL you can use list() function to get a list of Object[] array that contains result rows: Query query = session. createQuery(“select e. uid from Empdata e”); List rows = query.
What is HQL write difference between HQL and SQL?
Differences between SQL and HQL: SQL is based on a relational database model whereas HQL is a combination of object-oriented programming with relational database concepts. SQL manipulates data stored in tables and modifies its rows and columns. HQL is concerned about objects and its properties.
How does Stream distinct work?
distinct() returns a stream consisting of distinct elements in a stream. distinct() is the method of Stream interface. This method uses hashCode() and equals() methods to get distinct elements. In case of ordered streams, the selection of distinct elements is stable.
What is CreateQuery in hibernate?
CreateQuery: Used to create an HQL. createNamedQuery: Used to define queries with name in mapping file or annotation. See this. createNativeQuery: Used to execute native/pure SQL queries. Example.
What is criteria query in hibernate?
The Criteria API allows you to build up a criteria query object programmatically; the org.hibernate.Criteria interface defines the available methods for one of these objects. The Hibernate Session interface contains several overloaded createCriteria () methods.
How do I sort Hibernate query results?
Hibernate criteria – sort query results Sorting the query’s results works much the same way with criteria as it would with HQL or SQL. The Criteria API provides the org.hibernate.criterion.Order class to sort your result set in either ascending or descending order, according to one of your object’s properties.
How to get a single object instead of list in hibernate?
If you want obtain a single Object reference instead of a List, the uniqueResult () method on the Criteria object returns an object or null. If there is more than one result, the uniqueResult () method throws a HibernateException.
When to use resulttransformer vs hibernate?
When using ResultTransformer, hibernate does not include DISTINCT in SQL query, so we fall in troubles with paging (limit/offset) In my case, when I need to fetch details in outer join, it works perfect. Hibernate otherwise for each detail multiply the identical objects in the result set. To reduce those unexpectable duplicities it works very well.
