How do I write a HQL query?
Example of HQL update query
- Transaction tx=session.beginTransaction();
- Query q=session.createQuery(“update User set name=:n where id=:i”);
- q.setParameter(“n”,”Udit Kumar”);
- int status=q.executeUpdate();
Can we use join in HQL query?
HQL Join : HQL supports inner join, left outer join, right outer join and full join.
What is HQL query?
Hibernate Query Language (HQL) is an object-oriented query language, similar to SQL, but instead of operating on tables and columns, HQL works with persistent objects and their properties. HQL queries are translated by Hibernate into conventional SQL queries, which in turns perform action on database.
Which annotation is used to link two tables through a relation table?
The @OneToMany annotation is used to create the one-to-many relationship between the Student and Phone entities. The @JoinTable annotation is used to create the STUDENT_PHONE link table and @JoinColumn annotation is used to refer the linking columns in both the tables.
How fetch data from two tables in SQL join?
(INNER) JOIN : Returns records that have matching values in both tables. LEFT (OUTER) JOIN : Returns all records from the left table, and the matched records from the right table. RIGHT (OUTER) JOIN : Returns all records from the right table, and the matched records from the left table.
What is the difference between HQL and JPQL?
This is main difference between hql vs sql. HQL is a superset of the JPQL, the Java Persistence Query Language. A JPQL query is a valid HQL query, but not all HQL queries are valid JPQL queries. Note that Hibernate also provides the APIs that allow us to directly issue SQL queries as well.
What is the difference between SQL and HQL?
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.
Which is better SQL or HQL?
Traditional SQL code is longer than the HQL code. SQL is usually faster than the non-native HQL, however, by setting the correct cache size of the query plan, HQL can be made to operate as fast as SQL.