hibernate mapping

--> --> Hibernate o/R mapping three basic rule 1. Introduction In the Java environment, there are a variety of object-relational mapping methods, such as entity beans, OJB, JDO, JDBC, and so on. Hibernate is a new O/R mapping tool that not only provides mappings from Jav

table based on the specified primary key value, and then when it needs to use the relevant information of the Usersex table, Hibernate takes UserInfo's primary key value again to check the Connect connection table, and injects the found Usersex instance set into the UserInfo collection properties.In summary, we introduce some common relationships in relational database, and introduce how Hibernate uses ann

Yesterday, we shared a one -way, one-way, one- to - Many mapping relationship in Hibernate, and today we share the many-to-many mappings in hibernate in two directions .This time we take the project and the staff to raise a chestnut, because you can imagine, in the real environment, a project must be corresponding to a number of employees, which undoubtedly,At t

, if the ID is generated by hibernate, hibernate changes the Pojo at Save (Pojo) and sets its ID, whichMay change the Pojo of the hashcode, in detail to discuss the "Some of the attributes tagged in the mapping file and the operations of the Pojo object have an impact on the database operation, all of which will be in effect at commit.And the state of Pojo before

A one-to-many relationship can be divided into unidirectional and bidirectional.One-to-many relationship unidirectionalOne-way is to find the other side only from the side, usually from the master class to find the Class (table) that owns the foreign key. For example, a mother can have multiple children, and the child has a mother's primary key as a foreign key. The relationship between mother and child is a one-to-many relationship. If you want to act on the mother's information and also respon

There are two types of hibernate mappings: The built-in mapping type and the custom mapping type. The built-in mapping type is responsible for mapping some common Java types to the appropriate SQL type, and hibernate also allows u

Use myeclipse to generate the hibernate Mapping FileKeyword: hibernateIn hibernate, each data table corresponds to an entity class, and each entity class has a corresponding HBM. the xml configuration file matches you. myeclipse actually has a myeclipse Database Explorer view, which provides a built-in window for direct connection between myeclipse and the databa

1 declaration of an XML file -2 XML version= "1.0" encoding= "Utf-8"?>3 the declaration of the hibernate DTD file -4 DOCTYPE hibernate-mapping Public5 "-//hibernate/hibernate Mapping DTD 3.0//en"6 "Http://hibernate.sourceforge.net

the case of entity class inheritance in our projects. Today we'll talk about how to use hibernate to implement an inheritance mapping between entity classes.Principle AnalysisHibernate provides three strategies to implement inheritance mappings for classes: A table of inheritance trees, a table of classes, a table for a specific subclass.1. A tree to inherit a tableFirst look at the effect the first strate

There are two types of hibernate mappings: The built-in mapping type and the custom mapping type. The built-in mapping type is responsible for mapping some common Java types to the appropriate SQL type, and hibernate also allows u

First we understand a noun orm, the full name is (Object Relational Mapping), which is the object-relational mapping. The idea of ORM is to map the data of tables in a relational database into objects as objects, so that developers can translate the operations of the database into operations on those objects. Hibernate is the realization of this idea, to facilita

The mapping file is the key to the O/R mapping, equivalent to the control center. Manually configuring the mapping file is time-consuming when there are many database tables. In order to develop the program quickly and focus the developer's attention on the business logic, hibernate officially provides the Middlegen to

Disclaimer : csdn do not know how, sometimes it is not published blog. Originally is a day a blog post, recently engaged I am very depressed. Sometimes one day, sometimes two or three days can not send. This is a force majeure. No way, when can send, I sent.One, learning case: About hibernate configuration file and Object relational mapping file understanding. Second, case analysis:A)

"SSH Advanced Path" Hibernate fundamentals (i) , the small part introduces the basic principle of hibernate and its core, using the object-oriented thinking operation relational database. "SSH Advanced path" hibernate build development environment + Simple example (ii) , Xiao-bian set up the basic hibernate development