Java hibernate排序映射？错误：HH000091
大家好，我是新来Hibernate的，所以我正在网上学习一些教程。但是这个例子给了我以下的错误 有什么想法吗 更新1-Java hibernate排序映射？错误：HH000091,java,hibernate,hibernate-mapping,sortedset,Java,Hibernate,Hibernate Mapping,Sortedset,大家好，我是新来Hibernate的，所以我正在网上学习一些教程。但是这个例子给了我以下的错误 有什么想法吗 更新1- 我尝试了很多次来修复这个bug，但还是做不到。 调试时，我发现addEmployee方法中的empID为空。 我认为这就是这个问题的原因 2015年9月24日下午4:20:54 org.hibernate.property.access.spi.SetterMethodImpl设置错误： HH000123:类中存在IllegalArgumentException:Employe
我尝试了很多次来修复这个bug，但还是做不到。 调试时，我发现
addEmployeeempIDcreate table EMPLOYEE (
id INT NOT NULL auto_increment,
first_name VARCHAR(20) default NULL,
last_name VARCHAR(20) default NULL,
salary INT default NULL,
PRIMARY KEY (id)
);
create table CERTIFICATE (
id INT NOT NULL auto_increment,
certificate_type VARCHAR(40) default NULL,
certificate_name VARCHAR(30) default NULL,
employee_id INT default NULL,
PRIMARY KEY (id)
);
import java.util.*;
public class Employee {
private int id;
private String firstName;
private String lastName;
private int salary;
private SortedMap certificates;
public Employee() {}
public Employee(String fname, String lname, int salary) {
this.firstName = fname;
this.lastName = lname;
this.salary = salary;
}
public int getId() {
return id;
}
public void setId( int id ) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName( String first_name ) {
this.firstName = first_name;
}
public String getLastName() {
return lastName;
}
public void setLastName( String last_name ) {
this.lastName = last_name;
}
public int getSalary() {
return salary;
}
public void setSalary( int salary ) {
this.salary = salary;
}
public SortedMap getCertificates() {
return certificates;
}
public void setCertificates( SortedMap certificates ) {
this.certificates = certificates;
}
}
import java.util.Comparator;
public class MyClass implements Comparator <String>{
public int compare(String o1, String o2) {
final int BEFORE = -1;
final int AFTER = 1;
/* To reverse the sorting order, multiple by -1 */
if (o2 == null) {
return BEFORE * -1;
}
Comparable thisCertificate = o1;
Comparable thatCertificate = o2;
if(thisCertificate == null) {
return AFTER * 1;
} else if(thatCertificate == null) {
return BEFORE * -1;
} else {
return thisCertificate.compareTo(thatCertificate) * -1;
}
}
}
public class Certificate implements Comparable <String>{
private int id;
private String name;
public Certificate() {}
public Certificate(String name) {
this.name = name;
}
public int getId() {
return id;
}
public void setId( int id ) {
this.id = id;
}
public String getName() {
return name;
}
public void setName( String name ) {
this.name = name;
}
public int compareTo(String that){
final int BEFORE = -1;
final int AFTER = 1;
if (that == null) {
return BEFORE;
}
Comparable thisCertificate = this;
Comparable thatCertificate = that;
if(thisCertificate == null) {
return AFTER;
} else if(thatCertificate == null) {
return BEFORE;
} else {
return thisCertificate.compareTo(thatCertificate);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Employee" table="EMPLOYEE">
<meta attribute="class-description">
This class contains the employee detail.
</meta>
<id name="id" type="int" column="id">
<generator class="native"/>
</id>
<map name="certificates" cascade="all" sort="MyClass">
<key column="employee_id"/>
<index column="certificate_type" type="string"/>
<one-to-many class="Certificate"/>
</map>
<property name="firstName" column="first_name" type="string"/>
<property name="lastName" column="last_name" type="string"/>
<property name="salary" column="salary" type="int"/>
</class>
<class name="Certificate" table="CERTIFICATE">
<meta attribute="class-description">
This class contains the certificate records.
</meta>
<id name="id" type="int" column="id">
<generator class="native"/>
</id>
<property name="name" column="certificate_name" type="string"/>
</class>
</hibernate-mapping>
import java.util.*;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class ManageEmployee {
private static SessionFactory factory;
public static void main(String[] args) {
try{
factory = new Configuration().configure().buildSessionFactory();
}catch (Throwable ex) {
System.err.println("Failed to create sessionFactory object." + ex);
throw new ExceptionInInitializerError(ex);
}
ManageEmployee ME = new ManageEmployee();
/* Let us have a set of certificates for the first employee */
TreeMap set1 = new TreeMap();
set1.put("ComputerScience", new Certificate("MCA"));
set1.put("BusinessManagement", new Certificate("MBA"));
set1.put("ProjectManagement", new Certificate("PMP"));
/* Add employee records in the database */
Integer empID1 = ME.addEmployee("Manoj", "Kumar", 4000, set1);
/* Another set of certificates for the second employee */
TreeMap set2 = new TreeMap();
set2.put("ComputerScience", new Certificate("MCA"));
set2.put("BusinessManagement", new Certificate("MBA"));
/* Add another employee record in the database */
Integer empID2 = ME.addEmployee("Dilip", "Kumar", 3000, set2);
/* List down all the employees */
ME.listEmployees();
/* Update employee's salary records */
ME.updateEmployee(empID1, 5000);
/* Delete an employee from the database */
ME.deleteEmployee(empID2);
/* List down all the employees */
ME.listEmployees();
}
/* Method to add an employee record in the database */
public Integer addEmployee(String fname, String lname,
int salary, TreeMap cert){
Session session = factory.openSession();
Transaction tx = null;
Integer employeeID = null;
try{
tx = session.beginTransaction();
Employee employee = new Employee(fname, lname, salary);
employee.setCertificates(cert);
employeeID = (Integer) session.save(employee);
tx.commit();
}catch (HibernateException e) {
if (tx!=null) tx.rollback();
e.printStackTrace();
}finally {
session.close();
}
return employeeID;
}
/* Method to list all the employees detail */
public void listEmployees( ){
Session session = factory.openSession();
Transaction tx = null;
try{
tx = session.beginTransaction();
List employees = session.createQuery("FROM Employee").list();
for (Iterator iterator1 =
employees.iterator(); iterator1.hasNext();){
Employee employee = (Employee) iterator1.next();
System.out.print("First Name: " + employee.getFirstName());
System.out.print(" Last Name: " + employee.getLastName());
System.out.println(" Salary: " + employee.getSalary());
SortedMap<String, Certificate> map =
employee.getCertificates();
for(Map.Entry<String,Certificate> entry : map.entrySet()){
System.out.print("\tCertificate Type: " + entry.getKey());
System.out.println(", Name: " +
(entry.getValue()).getName());
}
}
tx.commit();
}catch (HibernateException e) {
if (tx!=null) tx.rollback();
e.printStackTrace();
}finally {
session.close();
}
}
/* Method to update salary for an employee */
public void updateEmployee(Integer EmployeeID, int salary ){
Session session = factory.openSession();
Transaction tx = null;
try{
tx = session.beginTransaction();
Employee employee =
(Employee)session.get(Employee.class, EmployeeID);
employee.setSalary( salary );
session.update(employee);
tx.commit();
}catch (HibernateException e) {
if (tx!=null) tx.rollback();
e.printStackTrace();
}finally {
session.close();
}
}
/* Method to delete an employee from the records */
public void deleteEmployee(Integer EmployeeID){
Session session = factory.openSession();
Transaction tx = null;
try{
tx = session.beginTransaction();
Employee employee =
(Employee)session.get(Employee.class, EmployeeID);
session.delete(employee);
tx.commit();
}catch (HibernateException e) {
if (tx!=null) tx.rollback();
e.printStackTrace();
}finally {
session.close();
}
}
}