JPA(hibernate)开发环境的搭建和一个基本的实例

实现产品是Hibernate

需要的jar:

hibernate-entitymanager-4.1.7.Final.jar

dist\lib\provided\jta-1.1.jar

required\*

JAR包列表如下:
  antlr-2.7.7.jar
  dom4j-1.6.1.jar
  hibernate-commons-annotations-4.0.1.Final.jar
  hibernate-core-4.1.7.Final.jar
  hibernate-entitymanager-4.1.7.Final.jar
  hibernate-jpa-2.0-api-1.0.1.Final.jar
  javassist-3.15.0-GA.jar
  jboss-logging-3.1.0.GA.jar
  jboss-transaction-api_1.1_spec-1.0.0.Final.jar

      jta-1.1.0.jar

配置文件必须放在根目录(src)的META-INF\persistence.xml

<?xml version="1.0"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/persistence
    http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
	version="1.0">
	<persistence-unit name="myPersistence" transaction-type="RESOURCE_LOCAL">
		<properties>
			<property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
			<property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver" />
			<property name="hibernate.connection.username" value="root" />
			<property name="hibernate.connection.password" value="root" />
			<property name="hibernate.connection.url"
				value="jdbc:mysql://localhost:3306/db_jpa?useUnicode=true&
                             characterEncoding=UTF-8" />
			<property name="hibernate.hbm2ddl.auto" value="update" />
		</properties>
	</persistence-unit>

</persistence>

 枚举类型:

public enum Gender {
   MAN,WOMAN
}

实体Bean:

import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

import com.yjdgis.enumation.Gender;
    
@Entity
@Table(name="tbl_person")
public class Person {
    private Integer id;
    private String name;
    private Date birthday;
    private Gender gender = Gender.MAN;
    private String context;
    private String imagePath;

public Person(){} public Person(String name) { this.name = name; } @Id @GeneratedValue(strategy=GenerationType.AUTO)//默认是auto public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } @Column(name="person_name",length=10,nullable=false) public String getName() { return name; } public void setName(String name) { this.name = name; } @Temporal(TemporalType.DATE) public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } @Enumerated(EnumType.STRING) @Column(length=5,nullable=false) public Gender getGender() { return gender; } public void setGender(Gender gender) { this.gender = gender; }    @Lob
   @Basic(fetch=FetchType.LAZY)//大字段延迟加载
public String getContext() { return context; } public void setContext(String context) { this.context = context; }   @Transient//这个注解用来标注imagePath这个属性不作为可持久化字段,就是说不跟数据库的字段做任何关联
  public String getImagePath() {
   return imagePath;
  }
  public void setImagePath(String imagePath) {
   this.imagePath = imagePath;
  }

}


测试类:

package junit.test;

import java.util.Date; import javax.persistence.EntityManager; import javax.persistence.EntityManagerFactory; import javax.persistence.Persistence; import org.junit.Test; import com.yjdgis.entity.Person; public class PersonTest { @Test public void test() { EntityManagerFactory factory = Persistence.createEntityManagerFactory("myPersistence"); EntityManager em = factory.createEntityManager(); em.getTransaction().begin(); Person p = new Person("黄文静"); p.setBirthday(new Date()); em.persist(p); em.getTransaction().commit(); em.close(); factory.close(); } }

 

 

    

posted @ 2013-01-23 10:28  hwj2wj  阅读(414)  评论(0编辑  收藏  举报