jpa manyTOMany映射笔记

import java.util.Set;

import javax.persistence.Entity;
import javax.persistence.ManyToMany;

import cn.yulezu.orm.hibernate.BaseEntity;

@Entity
public class Module extends BaseEntity {

private String title;
private String descn;
private String path;
@ManyToMany(mappedBy = "modules")//modules为administator里面的字段
private Set administators;

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getDescn() {
return descn;
}

public void setDescn(String descn) {
this.descn = descn;
}

public String getPath() {
return path;
}

public void setPath(String path) {
this.path = path;
}

public Set getAdministators() {
return administators;
}

public void setAdministators(Set administators) {
this.administators = administators;
}

}

------------------------------------------administator----------------

import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;

import cn.yulezu.orm.hibernate.BaseEntity;

@Entity
public class Administator extends BaseEntity {

// columns START
private String account;
private String password;

@ManyToMany(cascade = CascadeType.PERSIST, fetch = FetchType.LAZY)
@JoinTable(name = "Administator_Module", joinColumns = { @JoinColumn(name = "Administator_ID", referencedColumnName = "id") }, inverseJoinColumns = { @JoinColumn(name = "Module_ID", referencedColumnName = "id") })//id分别为这两张表的主键
private Set modules;

public Set getModules() {
return modules;
}

public void setModules(Set modules) {
this.modules = modules;
}

public String getAccount() {
return account;
}

public void setAccount(String account) {
this.account = account;
}

public String getPassword() {
return password;
}

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

}

-----------------------------baseentity-------------------

@MappedSuperclass
public class BaseEntity
{
@Id
//主键自动生成策略：数据库自动增长
@GeneratedValue
//主键
protected Integer id;
//是否显示
@Column(nullable=false)
protected boolean visible = true;
//插入时间
@Temporal(TemporalType.TIMESTAMP)
@Column(nullable=false,updatable=false)
protected Date insertTime;
//最后一次修改时间
@Temporal(TemporalType.TIMESTAMP)
protected Date lastUpdateTime;

public Integer getId()
{
return id;
}

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

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public boolean isVisible()
{
return visible;
}

public void setVisible(boolean visible)
{
this.visible = visible;
}

public Date getInsertTime()
{
return insertTime;
}

public void setInsertTime(Date insertTime)
{
this.insertTime = insertTime;
}

public Date getLastUpdateTime()
{
return lastUpdateTime;
}

public void setLastUpdateTime(Date lastUpdateTime)
{
this.lastUpdateTime = lastUpdateTime;
}

/**
* 是否是新对象
* @return
*/
public boolean isNew()
{
return (this.id == null);
}

}