Hibernate one to one configuration details

2010-10-22  来源:本站原创  分类:Java  人气:131 

This is my personal time to learn habinate test case.
Established before using MyEclipse habinate (this is not to say, Oh, that is, to be with a good data source)

. Package Name: cn.hdu .***( entity; service; test; util)
First, write the two entity classes Address (private int add_id;
private String city; private String country; private Company company;) and the Company (private int c_id; private String c_name; private Address address;), generating get, set methods, and then configure the mapping entity class file Address.hbm.xml and Company . hbm.xml.
Code:
---------- Address. Hbm.xm
<? Xml version = "1.0" encoding = "UTF-8"?>
<! DOCTYPE hibernate-mapping PUBLIC "- / / Hibernate / Hibernate Mapping DTD

3.0 / / EN "" http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd ">
<hibernate-mapping>
<class name="cn.hdu.entity.Address" table="ADDRESS">
<id name="add_id" column="ADD_ID">
<generator> <param

name = "sequence"> ADDRESS_SEQUENCES </ param> </ generator>
</ Id>
<property name="city" column="CITY"> </ property>
<property name="country" column="COUNTRY"> </ property>

<One-to-one name = "company" cascade = "save-update"

class = "cn.hdu.entity.Company" lazy = "false"> </ one-to-one>
</ Class>
</ Hibernate-mapping>

----------- Company. Hbm.xml
<? Xml version = "1.0" encoding = "UTF-8"?>
<! DOCTYPE hibernate-mapping PUBLIC "- / / Hibernate / Hibernate Mapping DTD

3.0 / / EN "" http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd ">
<hibernate-mapping>
<class name="cn.hdu.entity.Company" table="COMPANY">
<id name="c_id" column="C_ID">
<generator>
<param name="sequence"> COMPANY_SEQUENCES </ param> </ generator>
</ Id>
<property name="c_name" column="C_NAME"> </ property>
<Many-to-one name = "address" column = "ADD_ID"
class = "cn.hdu.entity.Address" unique = "true" lazy = "false"
cascade = "save-update"> </ many-to-one>
</ Class>
</ Hibernate-mapping>
NOTE: The above many-to-one, not to say that is many to one, this is only Company in the address attribute that points to Address the add_id property, ie one to one is an entity that may correspond to another entity in an attribute of a property.
COMPANY_SEQUENCES and ADDRESS_SEQUENCES representatives of the two sequences in the database,
Needs its own database and then create; id on behalf of the primary key, name = "" strictly equal to the entity class property name, column = "" representative of the database table field names, usually capitalized;
lazy = "false" said do not delay load, the main approach is to ensure that get the value from the database to avoid delay when the error occurred. cascade that when carrying out the operation at the same time habinate-one operation.

Do not forget to finish mapping the mapping file after the write hibernate.cfg.xml;
Code:
<session-factory>
.........
<property name="show_sql"> true </ property>
<mapping resource="cn/hdu/entity/Company.hbm.xml" />
<mapping resource="cn/hdu/entity/Address.hbm.xml" />
</ Session-factory>

One show_sql .. true; behalf of the Executive when the output sql statements.

Go after the test, write an implementation class
public class ServiceImp {
public void insertCompany (Company company) {

Session session = HibernateSessionFactory.getSession

();
Transaction tc = session.beginTransaction ();
session.save (company);
tc.commit ();
HibernateSessionFactory.closeSession ();
}

}
Test Class:
public class Test {
public static void main (String [] args) {
Service service = new ServiceImp ();
Company company = new Company ();
Address address = new Address ();
address.setCity ("beijin");
address.setCountry ("zhonguo");
company.setC_name ("CP");
company.setAddress (address);
service.insertCompany (company);
System.out.print ("OK ...");
}
Two tables in the database and then have a look, should be inserted into the data.
Oh, what I do not understand you can send mail ah, we learn from each other progress ~! ! ! !

Specific code in the annex src.

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