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Difference between query, native query, named query and typed query [closed]

What are the differences between a query, a native query, a named query and a typed query? Does the 'alone-standing' query even exist, or is it just an abbreviation? In my mind, a native Query is a query written in simple sql, whereas a named query relates to entities (hibernate-mapping). Can someone explain this briefly?

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Chris311 Avatar asked Oct 20 '15 12:10

Chris311


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What is the difference between named query and native query?

Native query refers to actual sql queries (referring to actual database objects). These queries are the sql statements which can be directly executed in database using a database client. Similar to how the constant is defined. NamedQuery is the way you define your query by giving it a name.

What is the difference between native query and JPQL?

There are three basic types of JPA Queries: Query, written in Java Persistence Query Language (JPQL) syntax. NativeQuery, written in plain SQL syntax. Criteria API Query, constructed programmatically via different methods.

What is native SQL query?

Native SQL is the SQL that the data source uses, such as Oracle SQL. Use Native SQL to pass the SQL statement that you enter to the database. IBM® Cognos® Analytics may add statements to what you enter. You can not use native SQL in a query subject that references more than one data source in the project.


1 Answers

Query

Query refers to JPQL/HQL query with syntax similar to SQL generally used to execute DML statements(CRUD operations).

In JPA, you can create a query using entityManager.createQuery(). You can look into API for more detail.

In Hibernate, you use session.createQuery()"

NativeQuery

Native query refers to actual sql queries (referring to actual database objects). These queries are the sql statements which can be directly executed in database using a database client.

JPA : entityManager.createNativeQuery() Hibernate (Non-JPA implementation): session.createSQLQuery()

NamedQuery

Similar to how the constant is defined. NamedQuery is the way you define your query by giving it a name. You could define this in mapping file in hibernate or also using annotations at entity level.

TypedQuery

TypedQuery gives you an option to mention the type of entity when you create a query and therefore any operation thereafter does not need an explicit cast to the intended type. Whereas the normal Query API does not return the exact type of Object you expect and you need to cast.

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Abhijith Nagarajan Avatar answered Sep 23 '22 05:09

Abhijith Nagarajan