friendshibernatedao.java

一个jsp写的bbs

package com.laoer.bbscs.dao.hibernate;

import java.util.*;

import org.springframework.orm.hibernate3.support.*;
import com.laoer.bbscs.bean.*;
import com.laoer.bbscs.dao.*;
import com.laoer.bbscs.comm.BBSCSUtil;
import org.hibernate.Session;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.springframework.orm.hibernate3.HibernateCallback;
import java.sql.SQLException;

/**
 * <p>Title: Tianyi BBS</p>
 *
 * <p>Description: BBSCS</p>
 *
 * <p>Copyright: Copyright (c) 2006</p>
 *
 * <p>Company: Laoer.com</p>
 *
 * @author Gong Tianyi
 * @version 7.0
 */
public class FriendsHibernateDAO
    extends HibernateDaoSupport implements FriendDAO {

  private int modNum;

  public FriendsHibernateDAO() {
  }

  /**
   * 保存或更新Friend对象
   *
   * @param f Friend
   * @return Friend
   * @todo Implement this com.laoer.bbscs.dao.FriendDAO method
   */
  public Friend saveFriend(Friend f) {
    this.getHibernateTemplate().saveOrUpdate(f);
    return f;
  }

  /**
   * 根据ID取得Friend对象
   * @param id String
   * @param ownId String
   * @return Friend
   * @todo Implement this com.laoer.bbscs.dao.FriendDAO method
   */
  public Friend findFriendByID(String id, String ownId) {
    StringBuffer sb = new StringBuffer();
    sb.append("from Friend");
    sb.append(BBSCSUtil.getTableID(ownId, this.getModNum()));
    sb.append(" where id = ? and userID = ?");
    Object[] o = {id, ownId};
    List l = this.getHibernateTemplate().find(sb.toString(), o);
    if (l == null || l.isEmpty()) {
      return null;
    }
    else {
      return (Friend) l.get(0);
    }

  }

  /**
   * 根据朋友名、自身ID取得Friend对象
   *
   * @param fname String
   * @param ownId String
   * @return Friend
   * @todo Implement this com.laoer.bbscs.dao.FriendDAO method
   */
  public Friend findFriendByName(String fname, String ownId) {
    StringBuffer sb = new StringBuffer();
    sb.append("from Friend");
    sb.append(BBSCSUtil.getTableID(ownId, this.getModNum()));
    sb.append(" where userID = ? and friendName = ?");
    Object[] o = {ownId, fname};
    List l = this.getHibernateTemplate().find(sb.toString(), o);
    if (l == null || l.isEmpty()) {
      return null;
    }
    else {
      return (Friend) l.get(0);
    }
  }

  /**
   * 取得朋友数量
   *
   * @param ownId String
   * @param isBlack int
   * @return int
   * @todo Implement this com.laoer.bbscs.dao.FriendDAO method
   */
  public int getFriendNum(String ownId, int isBlack) {
    StringBuffer sb = new StringBuffer();
    sb.append("select count(*) from Friend");
    sb.append(BBSCSUtil.getTableID(ownId, this.getModNum()));
    sb.append(" where userID = ? and isBlack = ?");
    Object[] o = {ownId, new Integer(isBlack)};
    List l = this.getHibernateTemplate().find(sb.toString(), o);
    if (l == null || l.isEmpty()) {
      return 0;
    }
    else {
      return ( (Integer) l.get(0)).intValue();
    }
  }

  /**
   * 取得朋友列表
   *
   * @param ownId String
   * @param isBlack int
   * @return List
   * @todo Implement this com.laoer.bbscs.dao.FriendDAO method
   */
  public List findFriends(String ownId, int isBlack) {
    StringBuffer sb = new StringBuffer();
    sb.append("from Friend");
    sb.append(BBSCSUtil.getTableID(ownId, this.getModNum()));
    sb.append(" where userID = ? and isBlack = ?");
    Object[] o = {ownId, new Integer(isBlack)};
    return this.getHibernateTemplate().find(sb.toString(), o);
  }

  /**
   * 删除Friend对象
   *
   * @param f Friend
   * @todo Implement this com.laoer.bbscs.dao.FriendDAO method
   */
  public void removeFriend(Friend f) {
    this.getHibernateTemplate().delete(f);
  }

  /**
   * 删除Friend对象
   *
   * @param id String
   * @param ownId String
   * @todo Implement this com.laoer.bbscs.dao.FriendDAO method
   */
  public void removeFriend(final String id, final String ownId) {
    final StringBuffer sb = new StringBuffer();
    sb.append("delete from Friend");
    sb.append(BBSCSUtil.getTableID(ownId, this.getModNum()));
    sb.append(" where id = ? and userID = ?");
    getHibernateTemplate().execute(new HibernateCallback() {
      public Object doInHibernate(Session s) throws HibernateException, SQLException {
        Query query = s.createQuery(sb.toString());
        query.setString(0, id);
        query.setString(1, ownId);
        query.executeUpdate();
        return null;
      }
    });
  }

  public void setModNum(int modNum) {
    this.modNum = modNum;
  }

  public int getModNum() {
    return modNum;
  }
}