脱离容器的EJB

 

 

 需要引入的包 hibernate - annotations，hibernate，hibernate - entitymanager 这3个包及附带的包

 

配置文件META-INF/persistence.xml

 

<? xml version = " 1.0 " ?>
< persistence xmlns = " http://java.sun.com/xml/ns/persistence " >
     < persistence - unit name = " example " >
         < provider > org.hibernate.ejb.HibernatePersistence </ provider >
         < class > com.foshanshop.ejb3.bean.Person </ class >
         < class > com.foshanshop.ejb3.bean.Order </ class >
         < class > com.foshanshop.ejb3.bean.OrderItem </ class >
         < class > com.foshanshop.ejb3.bean.Teacher </ class >
         < class > com.foshanshop.ejb3.bean.Student </ class >
         < properties >
             < property name = " hibernate.connection.driver_class "
                value = " com.microsoft.sqlserver.jdbc.SQLServerDriver "   />
             < property name = " hibernate.connection.url "
                value = " jdbc:sqlserver://127.0.0.1:1433; DatabaseName=EJB "   />
             < property name = " hibernate.dialect "
                value = " org.hibernate.dialect.SQLServerDialect "   />
             < property name = " hibernate.connection.username "
                value = " ls "   />
             < property name = " hibernate.connection.password "
                value = " 123456 "   />
             < property name = " hibernate.max_fetch_depth "  value = " 3 "   />
             < property name = " hibernate.hbm2ddl.auto "  value = " create "   />
             < property name = " hibernate.show_sql "  value = " true "   />
         </ properties >
     </ persistence - unit >
</ persistence >

持久类

 

 

package  com.foshanshop.ejb3.bean;

import  java.io.Serializable;
import  java.util.Date;
import  javax.persistence.Column;
import  javax.persistence.Entity;
import  javax.persistence.GeneratedValue;
import  javax.persistence.Id;
import  javax.persistence.Table;
import  javax.persistence.Temporal;
import  javax.persistence.TemporalType;
import  javax.persistence.GenerationType;

@Entity


public   class  Person  implements  Serializable  ... {
    @Id
    @GeneratedValue
    private Integer personid;

    @Column(nullable = false, length = 32)
    private String name;

    private boolean sex;

    private Short age;
 
    private Date birthday;
    


    public Integer getPersonid() ...{
        return personid;
    }

    public void setPersonid(Integer personid) ...{
        this.personid = personid;
    }

    public String getName() ...{
        return name;
    }

    public void setName(String name) ...{
        this.name = name;
    }

    // @Column(nullable=false)
    public boolean getSex() ...{
        return sex;
    }

    public void setSex(boolean sex) ...{
        this.sex = sex;
    }

    @Column(nullable = false)
    public Short getAge() ...{
        return age;
    }

    public void setAge(Short age) ...{
        this.age = age;
    }

    
    public Date getBirthday() ...{
        return birthday;
    }

    public void setBirthday(Date birthday) ...{
        this.birthday = birthday;
    }


}

 

测试类：

 

 

package com.foshanshop.ejb3;

import java.text.SimpleDateFormat;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import javax.persistence.PersistenceContextType;
import javax.persistence.Query;
import com.foshanshop.ejb3.bean.Person;

public   class  Example  ... {
    EntityManagerFactory emf;

    public Example() ...{
        emf = Persistence.createEntityManagerFactory("example");//example 为配置文件中指定
        
    }

    public void exercise() throws Exception ...{
        Person p = new Person();
        p.setName("John Doef1df2");
        p.setAge((short) 25);
        p.setSex(false);
        SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
        p.setBirthday(sf.parse("1990-02-01"));
        p.setD("abc");
        
        savePerson(p);
      
        Person py = findByName("John Doef1df2");
        System.out.println(py);
        emf.close();
    }

    private Person findByName(String name) ...{
        EntityManager em = emf.createEntityManager();
        Query q = em.createQuery("select person from Person as person where name=:param");
        
        q.setParameter("param", name);
        Person p = (Person) q.getSingleResult();
        em.close();
        return p;
    }



    private Person findById(Long id) ...{
        EntityManager em = emf.createEntityManager();
        Person p = em.find(Person.class, id);
        em.close();
        return p;
    }

    private int savePerson(final Person p) ...{
        EntityManager em = emf.createEntityManager();
        EntityTransaction tx = em.getTransaction();
        tx.begin();
        Person pp = em.merge(p);
        tx.commit();
        em.close();
        return pp.getPersonid();
    }



    public static void main(String[] args) throws Exception ...{
        Example example = new Example();
        example.exercise();
        try ...{
            Thread.sleep(30000);
        }
        catch (InterruptedException ex) ...{
        }
    }
}