src/com/dao/liuyanDao.java

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package com.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;




import com.bean.liuyan;
import com.util.DBO;
import java.util.List;
import java.sql.ResultSet;
public class liuyanDao {
	private DBO db=null;//
	 private liuyan liuyan=null;
	 public void  insert(liuyan liuyan) throws Exception{//添加留言
			db=new DBO();
		   db.open();
			
			String sql = "insert into liuyan (ly,sj,yh ) values ('"+liuyan.getLy()+"','"+liuyan.getSj()+"','"+liuyan.getYh()+"')";
		
			
			db.update(sql);
			//db.commit();
			db.close();
		
		}
	 public void  modify(liuyan liuyan) throws Exception{//修改留言
			db=new DBO();
		   db.open();
			
			String sql = "update liuyan set  ly='"+liuyan.getLy()+"',sj='"+liuyan.getSj()+"',yh='"+liuyan.getYh()+"' where lyid ='"+liuyan.getLyid()+"'";
		
			
			db.update(sql);
			//db.commit();
			db.close();
		
		}
	 public void  delete(String keyid) throws Exception{//删除留言
			db=new DBO();
		        db.open();
			
			String sql = "delete from liuyan where lyid='"+keyid+"'";
		
			
			db.update(sql);
			//db.commit();
			db.close();
		
		}
	 public ResultSet  qlist(String sl) throws Exception{//查询留言
		   db=new DBO();
		   db.open();
		   String sql="select * from liuyan where  1=1 ";
		if(!sl.equals("")){
			sql+=sl;
			
		}
		   System.out.println("sql="+sql);