Java利用JPA规范，实现实体关系解析，类似hibernate

package com.pan.beans;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name = "qxgl_product")
public class Product {

	private Integer id;
	private String name;
	private String remark;
	private Double price;
	private ProductType type;

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Column(name = "ID")
	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	@Column(name = "USER_NAME")
	public String getName() {
		return name;
	}

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

	@Column(name = "REMARK")
	public String getRemark() {
		return remark;
	}

	public void setRemark(String remark) {
		this.remark = remark;
	}

	@Column(name = "price")
	public Double getPrice() {
		return price;
	}

	public void setPrice(Double price) {
		this.price = price;
	}

	public void setType(ProductType type) {
		this.type = type;
	}

	@ManyToOne
	@Column(name = "type")
	public ProductType getType() {
		return type;
	}
}

package com.pan.beans;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name = "productType")
public class ProductType {

	private Integer id;
	private String name;

	private User user;
	public void setUser(User user) {
		this.user = user;
	}
	@ManyToOne
	@Column(name="user_id")
	public User getUser() {
		return user;
	}
	
	@Id
	@Column(name = "id")
	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	@Column(name = "name")
	public String getName() {
		return name;
	}

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


}

package com.pan.beans;

import javax.persistence.Column;
import javax.persistence.Id;
import javax.persistence.Table;

@Table(name="test")
public class Test{

	private Integer id;
	private String name;
	private String serial;

	@Id
	@Column(name="id")
	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	@Column(name="test_name")
	public String getName() {
		return name;
	}

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

	@Column(name="serial")
	public String getSerial() {
		return serial;
	}

	public void setSerial(String serial) {
		this.serial = serial;
	}

}