Tec Bar » Hibernate

Difference between Session get and load in Hibernate

James — Thu, 09 Apr 2015 00:47:42 +0000

Hibernate Session provides two methods to retrieve object e.g. get() and load() both looked quite similar to each other but there are subtle difference between load and get method. The major difference between two methods is: get method will involve … Continue reading →

The post Difference between Session get and load in Hibernate appeared first on Tec Bar.

Difference between flush and commit in Hibernate

James — Tue, 24 Mar 2015 19:22:43 +0000

Session flush is the process of synchronizing the underlying persistent store with persistable state held in memory. Flushing the session simply gets the data in the session synchronized with the database. If a persisted object in the Session has value … Continue reading →

The post Difference between flush and commit in Hibernate appeared first on Tec Bar.

Hibernate Query Cache Example

James — Sat, 07 Mar 2015 00:29:35 +0000

Hibernate query cache does not cache the state of actual entities in the result set, and it caches only identifier values and results of value type. Query cache integrates closely with the second-level cache, and is useful for queries that … Continue reading →

The post Hibernate Query Cache Example appeared first on Tec Bar.

Hibernate Second Level Cache Example

James — Wed, 04 Mar 2015 01:54:01 +0000

To enable second level cache, here we will use EHCache. Change mapping file category.hbm.xml, and one line [crayon-69fdd754870ee443638389/] [crayon-69fdd754870f5682914131/] add one ehcache.xml, a simple example [crayon-69fdd754870fb734198216/] [crayon-69fdd75487100715222613/] Let’s use the same code as we used in the 1st level cache … Continue reading →

The post Hibernate Second Level Cache Example appeared first on Tec Bar.

Hibernate First Level Cache Example

James — Tue, 03 Mar 2015 19:58:58 +0000

A couple of examples are given to shows Hibernate first level cache scenario. Database Table: [crayon-69fdd754876b5717942539/] Here are we are using XML Mappling without Annotations) Domain class: [crayon-69fdd754876bc150389048/] XML Mapping file: [crayon-69fdd754876c2832770171/] hibernate.cfg.xml [crayon-69fdd754876c8010364349/] Example Code 1: [crayon-69fdd754876d0989506517/] Output: [crayon-69fdd754876d5404493407/] … Continue reading →

The post Hibernate First Level Cache Example appeared first on Tec Bar.

Hibernate Caching

James — Tue, 03 Mar 2015 19:41:44 +0000

Caching is an import technique in Hibernate. When you use Hibernate in the application and enable Hibernate SQL trace, you might notice lots of SQL queries executed to grab data back from the database. A large number of such kinds … Continue reading →

The post Hibernate Caching appeared first on Tec Bar.

Hibernate Session

James — Tue, 24 Feb 2015 23:26:38 +0000

The main function of a Hibernate session is to open a database connection, and offer read and update operations for instances. Each instance object associated with the session will keep alive until the session is closed or the object is … Continue reading →

The post Hibernate Session appeared first on Tec Bar.

Configure c3p0 Connection Pool in Hibernate

James — Thu, 12 Feb 2015 01:21:02 +0000

Normally, opening a connection to a database consumes more time than executing an SQL statement. Connection pools can help to reuse some connections without creating the connections frequently. In DAO layer, it will help to improve your system performance. Hibernate … Continue reading →

The post Configure c3p0 Connection Pool in Hibernate appeared first on Tec Bar.