![]() Insert data if primary key not exist otherwise update data. What is session.saveOrUpdate() : saveOrUpdate does a select first to determine if it needs to do an insert or an update. What is session.save() : Save does an insert and will fail if the primary key is already persistent. No, Hibernate SessionFactory is basically thread-safe, thus can be re-usedĪcross multiple threads and multiple Transacions as well. No, Hibernate Session is basically single-threaded and not to be used across These files are searched on class path.Ĭan a single Hibernate Session object be used across multiple threads ? Hibernate consults file for its operating properties such as database dialect, connection string and mapping files. Hibernate can be configured with two types of files out of which is widely used and popular feature. Hibernate APIs can be used to store persistent objects.Įxplain how you can configure ? First Plain old java object needs to be written, XML mapping file should be created which shows relationship between database and class attributes. What is the Steps involved in creating database applications with Java using Hibernate ?Ĭreating Database applications with Java is made simpler with Hibernate. Some of the activities performed by session interface are as follows they are managing the persistence state, fetching persisted ones and management of the transaction demarcation. This represents hibernate session which perform the manipulation on the database entities. Only single instance of a class can be used which is using this interface. Application using hibernate are usually allowed and desgined to implement single instance of the class using this interface. Query.It creates new hibernate sessions by referencing immutable and thread safe objects. Query query = session.createQuery("from Employee") We can use it only for the queries that run frequently containing the same parameters. But it is optional, and it requires two cache regions that can hold the cached query results and also the timestamps whenever a table is updated. We can implement a cached query in Hibernate that results in sets and integrates tightly with the second-level cache. It is one of the highly used ORM tools for Java applications.Hibernate recommended in enterprise applications for database operations.Hibernate provides data query and retrieval facilities. ![]() Hibernate is based on Java Virtual Machine and written in Java.We can categorize Hibernate under the Object Relational Mapping (ORM), which features the mapping of Java classes to data tables and mapping from Java data types to SQL data types.Hibernate Interview Questions and Answers Free PDF Download It is the backbone in millions of enterprise applications for database operations. Hibernate is one of the most popular and widely used ORM tools for Java applications. Hibernate Interview Questions and Answers SessionFactory of Hibernate is a thread-safe?. ![]()
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