- Spring HibernateTemplate is a helper class that simplifies Hibernate data access code.
- It automatically converts HibernateExceptions into DataAccessExceptions .
- The central method of HibernateTemplate is execute that accepts HibernateCallback .
- The execute method provides Hibernate session handling. ...
What is the use of hibernatetemplate?
HibernateTemplate is typically used to implement data access or business logic services. The central method is execute(), that supports the Hibernate code that implements HibernateCallback interface. Define HibernateTemplate.
Do I need a spring hibernate template?
If you are using the Spring HibernateTemplate purely to reduce the amount of code needed to perform Hibernate data access operations, you would say you do not necessarily have to use a template! When looking at the above table however, we can see Spring does a lot more work behind the scenes than you might think.
What are the pros and cons of using hibernate template?
All spring templates (hibernate, jdbc, rest, jpa etc.) have the same pros and cons: Pro: They perform common setup routines for you, let you skip the boilerplate and concentrate on the logic you want. Con: you are coupling your application tightly to the spring framework. For this reason, Spring recommends that HibernateTemplate no longer be used.
What is hibernate in Spring Boot?
Since Hibernate 3.0.1 (and in the Java Persistence API from the moment it was first released) it became possible for Spring to manage the underlying resource without you having to go through any of the templates that are available for those technologies.
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Can we use HibernateTemplate in spring boot?
If you are going to use Spring Data JPA (as your pom. xml would suggest) there's no sense in using obsolete HibernateTemplate . Spring Boot doesn't create SessionFactory bean when Spring Data JPA is in use, however it creates EntityManagerFactory . You may autowire it and unwrap to SessionFactory .
What is the use of Hibernatetransactionmanager?
This transaction manager is appropriate for applications that use a single Hibernate SessionFactory for transactional data access, but it also supports direct DataSource access within a transaction (i.e. plain JDBC code working with the same DataSource).
What is spring Localsessionfactorybean?
FactoryBean that creates a Hibernate SessionFactory . This is the usual way to set up a shared Hibernate SessionFactory in a Spring application context; the SessionFactory can then be passed to data access objects via dependency injection. Compatible with Hibernate 5.2/5.3/5.4, as of Spring 5.3.
Which object we need to inject while using Hibernate template?
in the dao class, we use hibernate template to access the database. to create a hibernate template instance, you need a session factory. for this purpose, we injected the sessionfactory property in the spring bean configuration file. hibernate template is thread-safe and reusable.
What is the use of Jpatransactionmanager?
This transaction manager is appropriate for applications that use a single JPA EntityManagerFactory for transactional data access. JTA (usually through JtaTransactionManager ) is necessary for accessing multiple transactional resources within the same transaction.
What is Hibernate transaction?
A transaction simply represents a unit of work. In such case, if one step fails, the whole transaction fails (which is termed as atomicity). A transaction can be described by ACID properties (Atomicity, Consistency, Isolation and Durability).
What is the use of LocalSessionFactoryBean?
Class LocalSessionFactoryBean. FactoryBean that creates a Hibernate SessionFactory . This is the usual way to set up a shared Hibernate SessionFactory in a Spring application context; the SessionFactory can then be passed to Hibernate-based data access objects via dependency injection.
What is hibernate session in spring boot?
Hibernate Related Configurations Spring boot focusses on using JPA to persist data in relational db and it has ability to create repository implementations automatically, at runtime, from a repository interface.
What is the use of LocalContainerEntityManagerFactoryBean?
The LocalContainerEntityManagerFactoryBean gives full control over EntityManagerFactory configuration and is appropriate for environments where fine-grained customization is required. The LocalContainerEntityManagerFactoryBean will create a PersistenceUnitInfo based on the persistence.
What is dirty checking in hibernate?
Hibernate monitors all persistent objects. At the end of a unit of work, it knows which objects have been modified. Then it calls update statement on all updated objects. This process of monitoring and updating only objects that have been changed is called automatic dirty checking in hibernate.
What is SessionFactory in hibernate?
The SessionFactory is a thread safe object and used by all the threads of an application. The SessionFactory is a heavyweight object; it is usually created during application start up and kept for later use. You would need one SessionFactory object per database using a separate configuration file.
Where is DispatcherServlet in spring?
The DispatcherServlet is the front controller in Spring web applications. It's used to create web applications and REST services in Spring MVC. In a traditional Spring web application, this servlet is defined in the web. xml file.
setAllowCreate
Set if a new Session should be created if no thread-bound found. HibernateTemplate is aware of a respective Session bound to the current thread, for example when using HibernateTransactionManager. If allowCreate is true, a new Session will be created if none found. If false, an IllegalStateException will get thrown in this case.
setAlwaysUseNewSession
Set whether to always use a new Hibernate Session for this template.
isAlwaysUseNewSession
Return whether to always use a new Hibernate Session for this template.
setExposeNativeSession
Set whether to expose the native Hibernate Session to HibernateCallback code. Default is false; instead, a Session proxy will be returned, suppressing close calls and automatically applying query cache settings and transaction timeouts.
isExposeNativeSession
Return whether to expose the native Hibernate Session to HibernateCallback code, or rather a Session proxy.
setCheckWriteOperations
Set whether to check that the Hibernate Session is not in read-only mode in case of write operations (save/update/delete). Default is true, for fail-fast behavior when attempting write operations within a read-only transaction. Turn this off to allow save/update/delete on a Session with flush mode NEVER.
isCheckWriteOperations
Return whether to check that the Hibernate Session is not in read-only mode in case of write operations (save/update/delete).
Using Spring XxxTemplates
In Spring 1.0, we introduced a revolutionary way of working with data access APIs that threw checked exceptions.
Are templates really necessary?
The templates add a lot of value when using an API that uses checked exceptions (as opposed to runtime exceptions or unchecked exceptions), but also add a lot of consistency to your code base.
Going template-less
So, what do things look like if we’re not using the HibernateTemplate for example? It’s fairly simple to show how things work. The first thing we do is start using Session API directly instead of the HibernateTemplate. To get access to the Hibernate Session we need the SessionFactory which will be injected as usual:
The real question is: which approach to choose??
To answer with a typical consultant’s answer: ‘it all depends’ :). Let me tell you that I personally prefer to work without the HibernateTemplate and the JpaTemplate, just because I think they do not offer enough value anymore.
