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();
    }
}