dao层实现类的常见写法

记录下一个dao层类的写法，方便以后的使用。

 package com.bupt.auth.dao.impl;

 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
 import java.util.concurrent.CopyOnWriteArraySet;

 import org.springframework.stereotype.Repository;

 import com.bupt.auth.dao.RoleDao;
 import com.bupt.auth.dao.base.BaseDaoImpl;
 import com.bupt.auth.entity.Permission;
 import com.bupt.auth.entity.Role;
 import com.bupt.auth.exception.MyException;

 @Repository("roleDao")
 public class RoleDaoImpl extends BaseDaoImpl<Role> implements RoleDao {

     @Override
     public Role findRoleAdminByUserId(Long id) {
         // TODO Auto-generated method stub
         Role role = this.findRoleByRoleNameAndUserId(id, "administrator");

         return role;
     }

     @SuppressWarnings("unchecked")
     @Override
     public List<Role> findRoleByUserId(Long id) {
         // TODO Auto-generated method stub\
         String sql = "select r from Role r inner join fetch r.ownerUser u inner join fetch r.accessTokens left join fetch r.permissions where u.id = :id";
         List<Role> list = getSession().createQuery(sql).setLong("id", id).list();

         if(list == null || list.size() == 0)
             return null;

         List<Role> result = new ArrayList<Role>();
         for(Role role:list){
             if(!result.contains(role))
                 result.add(role);
         }

         return result;
     }

     @SuppressWarnings("unchecked")
     @Override
     public Role findRoleByRoleNameAndUserId(Long id, String rolename) {
         // TODO Auto-generated method stub
         String sql = "select r from Role r inner join fetch r.ownerUser u inner join fetch r.accessTokens where u.id = :id and r.name = :rolename";
         List<Role> list = getSession().createQuery(sql).setLong("id", id).setString("rolename", rolename).list();

         if(list == null || list.size() == 0)
             return null;

         return list.get(0);
     }

     @SuppressWarnings("unchecked")
     @Override
     public List<Role> findRoleByPermId(Long id) {
         // TODO Auto-generated method stub
         String sql = "select r from Role r inner join fetch r.ownerUser inner join fetch r.accessTokens inner join fetch r.permissions p where p.id = :id";
         List<Role> list = getSession().createQuery(sql).setLong("id", id).list();

         if(list == null || list.size() == 0)
             return null;

         List<Role> result = new ArrayList<Role>();
         for(Role role:list){
             if(!result.contains(role))
                 result.add(role);
         }

         return result;
     }

     @SuppressWarnings("unchecked")
     @Override
     public boolean deleteRolesPermissionByRoleIdAndPermId(Role role,
             Long permid) throws MyException {
         // TODO Auto-generated method stub
         //Role role = this.loadRoleByRoleId(roleid);
         if(role == null)
             throw new MyException("Role Not Found", "301");

         Set<Permission> pset = role.getPermissions();

         if(pset == null){
             throw new MyException("Role has no permissions", "");
         }
         if(pset.size() != 0)
         {
             Set<Permission> psetCopy = new HashSet<Permission>(pset);

             for(Permission p : psetCopy)
             {
                 if(p.getId().longValue() == permid.longValue()){
                     pset.remove(p);
                 }
             }
         }

         this.update(role);

         return true;
     }

     @Override
     public Set<String> findAccessTokensByRoleId(Long roleid) {
         // TODO Auto-generated method stub
         Role role = this.loadRoleByRoleId(roleid);

         if(role == null)
             return null;

         return role.getAccessTokens();
     }

     @Override
     public boolean deleteAccessTokenByRoleIdAndTokenString(Long roleid,
             String accessToken) throws MyException {
         // TODO Auto-generated method stub
         Role role = this.loadRoleByRoleId(roleid);

         if(role == null)
             throw new MyException("Role Not Found!", "301");

         Set<String> accessTokens = role.getAccessTokens();
         accessTokens.remove(accessToken);
         this.update(role);

         return true;
     }

     @Override
     public Role loadRoleByRoleId(Long roleid){
         String sql = "select r from Role r inner join fetch r.ownerUser inner join fetch r.permissions inner join fetch r.accessTokens where r.id = :id";
         List<Role> list = this.getSession().createQuery(sql).setLong("id", roleid).list();

         if(list == null || list.size() == 0){
             String sql2 = "select r from Role r inner join fetch r.ownerUser inner join fetch r.accessTokens where r.id = :id";
             List<Role> list2 = this.getSession().createQuery(sql2).setLong("id", roleid).list();

             if(list2 == null || list2.size() == 0){
                 return null;
             }

             return list2.get(0);
         }

         return list.get(0);
     }
 }