1、本系统的后台使用MySQL数据库，SSH 框架，前端使用ExtJs实现。因为系统需要用到权限管理，所以作此记录，权限管理精确到前端的每一个按钮，甚至每一个action请求。

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废话不多说，直接进入主题

（一）、数据库的设计

权限管理部分总共包括4个数据表：

Power（记录权限）、  Role（记录角色）、 PowerRole（中间表）、 PowerUrl（记录每一个action请求或者前端按钮）

（Role表）

package com.txb.model;

import java.util.Set;

import javax.persistence.CascadeType;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.FetchType;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.OneToMany;

import javax.persistence.Table;

@Entity

@Table(name="TB_ROLE")

public class Role {

private int roleId;

private String roleName;

private Set rolePowers;

private Set adminRoles;

@Id

@Column(name = "ROLE_ID", insertable = false, updatable = false, nullable = false, unique = true)

@GeneratedValue(strategy=GenerationType.AUTO)

public int getroleId() {

return roleId;

}

public void setroleId(int roleId) {

this.roleId = roleId;

}

@Column(name = "role_NAME", nullable = false, length = 50)

public String getroleName() {

return roleName;

}

public void setroleName(String roleName) {

this.roleName = roleName;

}

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "role") 

public Set getrolePowers() {

return rolePowers;

}

public void setrolePowers(Set rolePowers) {

this.rolePowers = rolePowers;

}

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "role") 

public Set getAdminroles() {

return adminRoles;

}

public void setAdminroles(Set adminRoles) {

this.adminRoles = adminRoles;

}

}

（Power表）

package com.txb.model;

import java.util.Set;

import javax.persistence.CascadeType;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.FetchType;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.OneToMany;

import javax.persistence.Table;

@Entity

@Table(name="TB_POWER")

public class Power {

private int powerId;

private String powerName;

private String powerType;

private String menu; //菜单

private Set rolePowers;

private Set actionUrls; //用户角色

@Id

@Column(name = "POWER_ID", insertable = false, updatable = false, nullable = false, unique = true)

@GeneratedValue(strategy=GenerationType.AUTO)

public int getPowerId() {

return powerId;

}

public void setPowerId(int powerId) {

this.powerId = powerId;

}

@Column(name="POWER_NAME", nullable = false, length = 50)

public String getPowerName() {

return powerName;

}

public void setPowerName(String powerName) {

this.powerName = powerName;

}

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "power")

public Set getRolePowers() {

return rolePowers;

}

public void setRolePowers(Set rolePowers) {

this.rolePowers = rolePowers;

}

@OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "power")

public Set getActionUrls() {

return actionUrls;

}

public void setActionUrls(Set actionUrls) {

this.actionUrls = actionUrls;

}

@Column(name="POWER_TYPE", nullable = false, length = 10)

public String getPowerType() {

return powerType;

}

public void setPowerType(String powerType) {

this.powerType = powerType;

}

@Column(name="POWER_MENU", nullable = true, length = 10)

public String getMenu() {

return menu;

}

public void setMenu(String menu) {

this.menu = menu;

}

}

（Role - Power 中间表，因为他们是多对多的关系）

package com.txb.model;

import java.io.Serializable;

import javax.persistence.*;

/**

 * The persistent class for the rose_power database table.

 * 

 */

@Entity

@Table(name="TB_ROLE_POWER")

public class RolePower implements Serializable {

private int rpid;

private Power power;

private Role role;

public RolePower() {

}

@Id

@Column(name = "RP_ID", insertable = false, updatable = false, nullable = false, unique = true)

@GeneratedValue(strategy=GenerationType.AUTO)

public int getRpid() {

return this.rpid;

}

public void setRpid(int rpid) {

this.rpid = rpid;

}

@ManyToOne

@JoinColumn(name="POWER_ID")

public Power getPower() {

return this.power;

}

public void setPower(Power power) {

this.power = power;

}

@ManyToOne

@JoinColumn(name="ROLE_ID")

public Role getRole() {

return role;

}

public void setRole(Role role) {

this.role = role;

}

}

（PowerUrl 表，这个表是用来记录每一个action请求，判断该用户所拥有的权限是否能执行对应的action请求）

package com.txb.model;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.JoinColumn;

import javax.persistence.ManyToOne;

import javax.persistence.Table;

@Entity

@Table(name="TB_ACTION_URL")

public class ActionUrl {

private Power power;

private String url;

private String actionName;

private int aId;

@ManyToOne

@JoinColumn(name="POWER_ID")

public Power getPower() {

return power;

}

public void setPower(Power power) {

this.power = power;

}

@Column(name="URL", nullable = false, length = 50)

public String getUrl() {

return url;

}

public void setUrl(String url) {

this.url = url;

}

@Column(name="ACTION_NAME", nullable = false, length = 50)

public String getActionName() {

return actionName;

}

public void setActionName(String actionName) {

this.actionName = actionName;

}

@Id

@Column(name = "A_ID", insertable = false, updatable = false, nullable = false, unique = true)

@GeneratedValue(strategy=GenerationType.AUTO)

public int getaId() {

return aId;

}

public void setaId(int aId) {

this.aId = aId;

}

}

到此权限数据库就已经设计完毕，下一篇给大家介绍后台逻辑部分

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