权限表设计之代码解析

在权限表设计中已经说了权限表的结构，在这里我说下代码

user表

</pre><pre name="code" class="html">@Entity@Table(name="user")public class User implements Serializable{    private static final long serialVersionUID = 6177417450707400228L;@Id@GeneratedValue(strategy = GenerationType.AUTO)    @Column(name="userid",nullable=false)private int userId;    @Column(name="username")private String userName;@Column(name="userpassword")    private String userPassword;    /*     * cascade：为级联操作，里面有级联保存，级联删除等，all为所有      * fetch：加载类型，有lazy和eager二种，     *   eager为急加载，意为立即加载，在类加载时就加载，lazy为慢加载，第一次调用的时候再加载，由于数据量太大，onetomany一般为lazy     * mappedBy：这个为manytoone中的对象名，这个不要变哦     *      * <UserRole>:为要获得的mappedBy的类     */    @OneToMany(fetch=FetchType.LAZY,mappedBy="user",cascade=CascadeType.ALL)private List<UserRole> listUserRole; public int getUserId() {return userId;}public void setUserId(int userId) {this.userId = userId;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getUserPassword() {return userPassword;}public void setUserPassword(String userPassword) {this.userPassword = userPassword;}public List<UserRole> getListUserRole() {return listUserRole;}public void setListUserRole(List<UserRole> listUserRole) {this.listUserRole = listUserRole;}} 

userrole表

@Entity@Table(name="userrole")public class UserRole implements Serializable{    private static final long serialVersionUID = 6177417450707400228L;@Id@GeneratedValue(strategy = GenerationType.AUTO)    @Column(name="id",nullable=false)private int id;@ManyToOne(fetch=FetchType.EAGER,cascade=CascadeType.ALL)@JoinColumn(name="userid")private User user;    @ManyToOne(fetch=FetchType.EAGER,cascade=CascadeType.ALL)@JoinColumn(name="roleid")private Role role;public int getId() {return id;}public void setId(int id) {this.id = id;}public User getUser() {return user;}public void setUser(User user) {this.user = user;}public Role getRole() {return role;}public void setRole(Role role) {this.role = role;}}

role表

@Entity@Table(name="role")public class Role implements Serializable{private static final long serialVersionUID = 6177417450707400228L;   @Id@GeneratedValue(strategy = GenerationType.AUTO)    @Column(name="roleid",nullable=false)private int roleId;@Column(name="rolename")    private String roleName;@OneToMany(fetch=FetchType.LAZY,mappedBy="role",cascade=CascadeType.ALL)private List<UserRole> listUserRole;@OneToMany(fetch=FetchType.LAZY,mappedBy="role",cascade=CascadeType.ALL)private List<RolePermission> listRolePermission;public int getRoleId() {return roleId;}public void setRoleId(int roleId) {this.roleId = roleId;}public String getRoleName() {return roleName;}public void setRoleName(String roleName) {this.roleName = roleName;}public List<UserRole> getListUserRole() {return listUserRole;}public void setListUserRole(List<UserRole> listUserRole) {this.listUserRole = listUserRole;}public List<RolePermission> getListRolePermission() {return listRolePermission;}public void setListRolePermission(List<RolePermission> listRolePermission) {this.listRolePermission = listRolePermission;}}

rolepermission表

@Entity@Table(name="rolepermission")public class RolePermission implements Serializable{    private static final long serialVersionUID = 6177417450707400228L;@Id@GeneratedValue(strategy = GenerationType.AUTO)    @Column(name="id",nullable=false)private int id;@ManyToOne(fetch=FetchType.EAGER,cascade=CascadeType.ALL)@JoinColumn(name="roleid")private Role role;@ManyToOne(fetch=FetchType.EAGER,cascade=CascadeType.ALL)@JoinColumn(name="permissionid")private Permission permission;public int getId() {return id;}public void setId(int id) {this.id = id;}public Role getRole() {return role;}public void setRole(Role role) {this.role = role;}public Permission getPermission() {return permission;}public void setPermission(Permission permission) {this.permission = permission;}}

permission表

@Entity@Table(name="permission")public class Permission implements Serializable{        private static final long serialVersionUID = 6177417450707400228L;        @Id@GeneratedValue(strategy = GenerationType.AUTO)    @Column(name="permissionid",nullable=false)private int permissionId;    @Column(name="permission")private String permission;    @OneToMany(fetch=FetchType.LAZY,mappedBy="permission",cascade=CascadeType.ALL)private List<RolePermission> listRolePermission;    public int getPermissionId() {return permissionId;}public void setPermissionId(int permissionId) {this.permissionId = permissionId;}public String getPermission() {return permission;}public void setPermission(String permission) {this.permission = permission;}public List<RolePermission> getListRolePermission() {return listRolePermission;}public void setListRolePermission(List<RolePermission> listRolePermission) {this.listRolePermission = listRolePermission;}}

我这里是按照我的权限表博客里设计的，另外使用的onetomany和manytoone,在这里也可以用manytomany,

根据大家的喜好来写吧。