what is orm in hibernate

Relational mappingsPerformance is slightly less efficient than source SQLEasier and faster operabilityDjango's ORM and SqlalchamyDifferenceSqlalchamy does not have Django function full, double underlined table cross table operationSqlalchamy and close to SQL statementsFor example, Django is simpler, such as a double-underlined table operationSQL cannot generate a

What is hibernate lazy loading? When should I load it with laziness? Why should I load it with laziness ?, Hibernate Lazy is called delayed loading and delayed loading. When should I load it with laziness? I can only answer the question: When should I load it with laziness.

adopt the usual "active" lazy approach, namely, creating tools to automate the entire process. For relational databases, the biggest achievement of such efforts is the object/relational ing (ORM) tool. 　　 There are many such tools, from expensive commercial products to the EJB standards built into J2EE. However, in many cases, these tools have their own complexity, so developers must learn to use their det

also takes up a large part of the development workload of the entire application. Good object-oriented developers get tired of repetitive work and begin to adopt the usual "active" lazy approach, namely, creating tools to automate the entire process. For relational databases, the biggest achievement of such efforts is the object/relational ing (ORM) tool. There are many such tools, from expensive commercia

solutions such as Hibernate and Apache OJB, ibatis is"Semi-automatic. The so-called "semi-automated" may be a little cool to understand. Throughout the mainstream Orm, both Hibernate and Apache OJB provide a complete encapsulation of the database structure and a full set of ing mechanisms from pojo to database tables.

A:. Project structureSecond, the Code1) hibernateutil Packageutil;Importorg.hibernate.SessionFactory;Importorg.hibernate.boot.MetadataSources;ImportOrg.hibernate.boot.registry.StandardServiceRegistry;ImportOrg.hibernate.boot.registry.StandardServiceRegistryBuilder; Public classHibernateutil {Private Staticsessionfactory SF; Static{Standardserviceregistry Registry=Newstandardserviceregistrybuilder (). Configure ()//The experimental method gives a parameter to see if the config file name

, that is, creating tools that automate the process. For relational databases, the greatest achievement of this effort is the object/relational mapping (ORM) tool. 　　 There are many such tools, from expensive commercial products to the EJB standard that is placed in Java EE. However, in many cases, these tools have t

JPA describes the mapping of objects-relational tables through JDK 5.0 annotations or XML, and persists entity objects for the run-time into the database.One of the goals of JPA is to develop an API that can be implemented by many vendors, and developers can code to implement the API instead of using proprietary vendor-specific APIs. So developers only need to use vendor-specific APIs to get the functionality that the JPA specification does not addres

hibernate allows developers to manipulate relational databases using an object-oriented approach.With hibernate support, the OOA (object-oriented analysis), OOD (object-oriented design) and OOP (object-oriented programming) of the Java EE application are all three processes same strain to become a whole.two. ORMCurrently popular programming languages, such as Java, C #, are all object-oriented programming

classA column of field mappings in the data table is called the property of the instance object that corresponds to the persisted class (field)As for how the ORM framework handles the transformation between the two, this is transparent to developers without the developer's concern.The popular ORM Framework:JPA:JPA its

First, what is the hibernate framework?1, the database to save the Java Runtime objects and restore objects, in fact, the implementation of Java objects and relational database records mapping relationship is called ORM (object Relation Mapping), one can do this by encapsula

------------I do not have him, but the hand is ripe, humble and foolish, and eager to be hungry-------------for the friends who have learned the ORM framework, the hibernateorm, familiar with a little strange, familiar is nothing but the soul, unfamiliar is just some language1.1: h