Hibernate学习——一般配置

mysql建表语句：

create 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) );

Employee.java

package com.study;

public class Employee {
	private int id;
	private String firstName;
	private String lastName;
	private int salary;

	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 firstName) {
		this.firstName = firstName;
	}

	public String getLastName() {
		return lastName;
	}

	public void setLastName(String lastName) {
		this.lastName = lastName;
	}

	public int getSalary() {
		return salary;
	}

	public void setSalary(int salary) {
		this.salary = salary;
	}
}

对应映射文件：employee.hbm.xml

<?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 package="com.study">
	<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" /><!-- Set the class attribute of the generator element is set to native to let hibernate pick up either identity, sequence or hilo algorithm to create primary key depending upon the capabilities of the underlying database. -->
		</id>
		<property name="firstName" column="first_name" type="string" />
		<property name="lastName" column="last_name" type="string" />
		<property name="salary" column="salary" type="int" />
	</class>
</hibernate-mapping>

主配置文件：hibernate.cfg.xml

<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-configuration SYSTEM "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
	<session-factory>
		<property name="hibernate.dialect"> org.hibernate.dialect.MySQLDialect </property>
		<property name="hibernate.connection.driver_class"> com.mysql.jdbc.Driver </property> <!-- Assume test is the database name -->
		<property name="hibernate.connection.url"> jdbc:mysql://localhost/test </property>
		<property name="hibernate.connection.username"> root </property>
		<property name="hibernate.connection.password"> 253503125 </property> <!-- List of XML mapping files -->
		<mapping resource="com/study/employee.hbm.xml" />
	</session-factory>
</hibernate-configuration>

测试：

package com.study;

import java.util.Iterator;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
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(); 
		/* Add few employee records in database */ 
		Integer empID1 = ME.addEmployee("Zara", "Ali", 1000); 
		Integer empID2 = ME.addEmployee("Daisy", "Das", 5000);
		Integer empID3 = ME.addEmployee("John", "Paul", 10000); 
		/* List down all the employees */
		ME.listEmployees(); 
		/* Update employee's records */
		ME.updateEmployee(empID1, 5000);
	/* Delete an employee from the database */ 
		ME.deleteEmployee(empID2); 
		/* List down new list of the employees */ 
		ME.listEmployees(); 
	} 
	/* Method to CREATE an employee in the database */ 
		public Integer addEmployee(String fname, String lname, int salary){
			Session session = factory.openSession();
			Transaction tx = null;
			Integer employeeID = null;
			try{ 
				tx = session.beginTransaction(); 
				Employee employee = new Employee(fname, lname, salary);
				employeeID = (Integer) session.save(employee); tx.commit(); 
			}catch (HibernateException e) { 
				if (tx!=null) 
					tx.rollback();
				e.printStackTrace(); 
			}finally {
				session.close();
			} 
			return employeeID; 
		}
		/* Method to READ all the employees */
		public void listEmployees( ){
			Session session = factory.openSession(); 
			Transaction tx = null; 
			try{ 
				tx = session.beginTransaction(); 
				List employees = session.createQuery("FROM Employee").list();
				for (Iterator iterator = employees.iterator();iterator.hasNext();){ 
					Employee employee = (Employee) iterator.next();
					System.out.print("First Name: " + employee.getFirstName()); 
					System.out.print(" Last Name: " + employee.getLastName());
					System.out.println(" Salary: " + employee.getSalary()); 
				} 
				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();
			}
		}
}

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