The identifier as a convenient handle to a persistent object. Hence it’s common for applications to use Get() method is special because the identifier uniquely identifies a
LATEST HIBERNATE INTERVIEW QUESTIONS CODE
The difference is trivial:įollowing Hibernate code snippet retrieves a User object from theĭatabase: User user = (User) session.get(User.class, userID) The load() method is older get() was added to Hibernate’s API due to user request. What is the difference between hibernate get and load methods? A. User = (UserInfo)session.load(UserInfo.class, id) Sessions when all work for a transaction is completed. Hibernate Session object represents a single unit-of-work for a givenĭata store and is opened by a SessionFactory instance. Persistent: associated with a unique Sessionĭetached: previously persistent, not associated with any Session Transient: never persistent, not associated with any Session Instances may exist in one of three states: Offer create, read and delete operations for instances of mapped entityĬlasses. SessionFactory is typically created once and used to create all sessions Prior to creating the SessionFactory instance. However, you must make these modifications Once theĬonfiguration is initialized, you can make any additional modifications To Configuration().configure() loads the Ĭonfiguration file and initializes the Hibernate environment. SessionFactory factory = cfg.buildSessionFactory() The hibernate mapping file entry in mapping resource inside Spring’sĪpplicationContext.xml file in the web/WEB-INF directory.Ĭonfiguration cfg = new Configuration().configure() How do you define hibernate mapping file in spring? A. This is the default strategy if no Īssigned by a database trigger by selecting the row by some unique key Lets the application to assign an identifier to the object before Native: It picks identity, sequence or hilo depending upon the capabilities of the underlying database. Guid: It uses a database-generated GUID string on MS SQL Server and MySQL. Is encoded as a string of hexadecimal digits of length 32. Type string, unique within a network (the IP address is used).
LATEST HIBERNATE INTERVIEW QUESTIONS GENERATOR
Uuid generator uses a 128-bit UUID algorithm to generate identifiers of Type long, short or int, given a named database sequence. Generator uses a hi/lo algorithm to efficiently generate identifiers of Not use this generator with connections enlisted with JTA or with a Generates identifiers that are unique only for a particular database. Next_hi respectively) as a source of hi values. Or int, given a table and column (by default hibernate_unique_key and Hi/lo algorithm to efficiently generate identifiers of type long, short Sequence generator uses a sequence in DB2, PostgreSQL, Oracle, SAP DB, The returned identifier is of type long, short or int.
It supports identity columns in DB2, MySQL, MS SQL Server, Sybase and Should not the used in the clustered environment. Only when no other process is inserting data into the same table. It generates identifiers of type long, short or int that are unique
Provides a range of built-in implementations.
Provide their own specialized implementations, however, Hibernate All generators implement the interface .IdentifierGenerator.
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