hibernate mapping

A recent project has a demand, there are n assessment units, to each unit of assessment to generate a checklist, the purpose of this is to cross-cutting the database, this requirement of implementation, my team members encountered a technical problem, I will my solution and the whole thinking process with you to share,Ideas:With a configuration file, a class is used to map multiple tables (each table has the same structure). According to the usual practice, how many tables will have to write how

"Hibernate" about using a join table to implement a one -to-many association mappingA one-to-many association mapping based on an intermediate table is still more common.Person (people) and group (group)Annotations Configuration@Entity @table (name= "T_group") publicclassgroup{privateintegerid ;privatestringname;privateset@Entity @table (name= "P_person") publicclassperson{privateinteger Id;privatestringnam

= hibernateutils.getsession (); session.begintransaction (); person person = (person) session.load (person.class,5); system.out.println (Person.getname ()); system.out.println (Person.getidcard (). Getcardno ()); session.gettransaction (). commit (); }catch (Exception e) { e.printstacktrace (); session.gettransaction (). rollback (); }finally{ hibernateutils.closesession (session); } } Load the Idcard object first, and then load the person objectpublic void TestLoad2 () {Sess

Then on a few blogs, hibernate mapping relationship, today we talk about the last of the basic relationship: many-to-many. one, many-to-many relationships phenomenon: Many-to-many relationship, in life is very common in the relationship between the students and elective courses, a student can choose more than one elective course, and each elective course can be more than a choice of students. There is a lot

Hibernate provides two ways to map relationships on a one-to-one basis:1) Follow foreign key mapping2) Follow the primary key mappingThe following is an example of the Employee Account form and the Employee Profile table (a one-to-two relationship between the employee account and the file table), which is described in the following two mapping relationships, and each of these mappings is used to perform per

fish This class requires the use of inheritance mappings to complete the configuration of this association relationship2 All self-class parent classes correspond to a single tableClassification: First there must be a classification only after the classification then this will know who is the dataThe fields of the table should contain all the fieldsHere's the column for the classification.-3 All classes correspond to tables1>: To implement the sub-table then the first thing to do is to anianl th

In the actual development is generally hibernate.properties and hibernate.cfg.xml combined use. Generally in the property file Hibernate.properties to store database connection related operational data, in the Hibernate.cfg.xml file to store mapping configuration, in Users.hbm.xml (. Hbm.xml before the users, custom, you can have an entity class corresponding to one. h Bm.xml file, you can also have multiple entity classes that correspond to a. hbm.xm

hibernate is not supported for the text data type of the database.Hibernate is good when using the HQL query to include the text Type field. If you use native SQL, which is when querying the text type using the Createsqlquery method, you always get an error:Org.hibernate.MappingException:No dialect mapping for JDBC type:-1Atorg.hibernate.dialect.TypeNames.get (typenames.java:56)There was a problem with the

In hibernate, each data table corresponds to an entity class, each entity class has a corresponding Hbm.xml configuration file matching, MyEclipse has a myeclipse Database Explorer View , It provides a built-in window that myeclipse directly connected to the database, and allows you to generate hibernate mapping files from this windowThe premise is that a new Web

JPA (Java Persistence API) is a Java persistence specification proposed by Sun. Provides an object/relational mapping tool for Java developers to manage relational data in Java applications. The overall idea of JPA is broadly consistent with existing ORM frameworks such as Hibernate and TopLink. In general, JPA includes the following 3 areas of technology:First: ORM Map