myeclipse通过数据表生成jpa或hibernate实体

就是说，如果你已经有了数据库表，那么你又不想手工书写jpa或hibernate实体（要谁都不想，还要自己写那么一大堆的注解），myeclipse能够帮助你自动生成。

1、首先你需要创建一个jpa项目：

如图在普通项目上点右键添加



2、打开生成工作环境



3、创建数据库连接

因为，myeclipse也要连接数据库获取表结构



4、填写连接信息



5、打开表列表，选择导出模式



6、保存导出实体工程选择

（这一步需要第1步的操作，否则，没有可选工程）



现在就生成了entity，如：

package com.partner4java.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.Table;

/**
* User entity. @author MyEclipse Persistence Tools
*/
@Entity
@Table(name = "user", catalog = "hello_world")
public class User implements java.io.Serializable {

// Fields

private Integer id;
private String username;
private String password;
private String address;

// Constructors

/** default constructor */
public User() {
}

/** minimal constructor */
public User(String username, String password) {
this.username = username;
this.password = password;
}

/** full constructor */
public User(String username, String password, String address) {
this.username = username;
this.password = password;
this.address = address;
}

// Property accessors
@Id
@GeneratedValue(strategy = IDENTITY)
@Column(name = "id", unique = true, nullable = false)
public Integer getId() {
return this.id;
}

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

@Column(name = "username", nullable = false, length = 20)
public String getUsername() {
return this.username;
}

public void setUsername(String username) {
this.username = username;
}

@Column(name = "password", nullable = false, length = 20)
public String getPassword() {
return this.password;
}

public void setPassword(String password) {
this.password = password;
}

@Column(name = "address", length = 20)
public String getAddress() {
return this.address;
}

public void setAddress(String address) {
this.address = address;
}

}