我使用 Netbeans IDE。
我的 hibernate.cfg.xml 看起来像这样：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
//properties
<mapping resource="entities.Employee"/>
<mapping resource="entities.Human"/>
</session-factory>
</hibernate-configuration>
hibernate.cfg.xml 在
NetBeansProjects\HibernateTest\build\web\WEB-INF\classes\
我初始化 SessionFactory 的代码如下所示：
static {
try {
String configFilePath = "/hibernate.cfg.xml";
URL configFileURL = SessionFactory.class.getResource(configFilePath);
sessionFactory = new Configuration().configure(configFileURL).buildSessionFactory();
} catch (Throwable ex) {
// Log the exception.
throw new RuntimeException(ex);
}
}
和实体（Employee.class 和 Human.class）在
\NetBeansProjects\HibernateTest\build\web\WEB-INF\classes\entities\
班级员工：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package entities;
import java.io.Serializable;
import javax.persistence.*;
@Entity
@Table(name = "EMPLOYEE")
public class Employee implements Serializable {
public Employee(){
}
@Id
@GeneratedValue(strategy = GenerationType.TABLE)
@Column(name = "EMPLOYEE_ID")
private int employeeId;
@Column(name = "SALARY")
private double salary;
@OneToOne(cascade = CascadeType.ALL, fetch= FetchType.LAZY)
@PrimaryKeyJoinColumn
private Human humDate;
public int getEmployeeId() {
return employeeId;
}
public void setEmployeeId(int employeeId) {
this.employeeId = employeeId;
}
public Human getHumDate() {
return humDate;
}
public void setHumDate(Human humDate) {
this.humDate = humDate;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
}
类人：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package entities;
import java.io.Serializable;
import javax.persistence.*;
@Entity
@Table(name = "HUMAN")
public class Human implements Serializable {
public Human(){
}
public Human(String name){
this.name = name;
}
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.TABLE)
private int id;
@Column(name = "HUM_NAME")
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
@Override
public int hashCode() {
int hash = 0;
hash += (int) id;
return hash;
}
@Override
public boolean equals(Object object) {
// TODO: Warning - this method won't work in the case the id fields are not set
if (!(object instanceof Human)) {
return false;
}
Human other = (Human) object;
if (this.id != other.id) {
return false;
}
return true;
}
@Override
public String toString() {
return "com.nsn.Human[ id=" + id + " ]";
}
}
这里有什么问题？