jpa的常用注解

Posted 2021-12-18 lei0913

package com.itheima.domain;

import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;

@Entity
@Table(name="t_role")
public class Role
@Id
@Column
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int rid;
@Column
private String rname;
@Column
private String rdesc;
@ManyToMany(targetEntity=User.class,cascade = CascadeType.ALL)
@JoinTable(
//声明关联表结构
name="t_user_role",
joinColumns = @JoinColumn(name = "fk_rid",referencedColumnName = "rid"),
inverseJoinColumns = @JoinColumn(name = "fk_uid",referencedColumnName = "id")
)
private List<User> users=new ArrayList<User>();

public List<User> getUsers()
return users;

public void setUsers(List<User> users)
this.users = users;

public Role()

public Role(String rname, String rdesc)
this.rname = rname;
this.rdesc = rdesc;

public String getRname()
return rname;

public void setRname(String rname)
this.rname = rname;

public int getRid()
return rid;

public void setRid(int rid)
this.rid = rid;

public String getRdesc()
return rdesc;

public void setRdesc(String rdesc)
this.rdesc = rdesc;