src/com/dao/chengjiDao.java

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




import com.bean.chengji;
import com.util.DBO;
import java.util.List;
import java.sql.ResultSet;
public class chengjiDao {
	private DBO db=null;//
	 private chengji chengji=null;
	 public void  insert(chengji chengji) throws Exception{//添加成绩
			db=new DBO();
		   db.open();
			
			String sql = "insert into chengji (zy,cj,xs,fbsj,fbr ) values ('"+chengji.getZy()+"','"+chengji.getCj()+"','"+chengji.getXs()+"','"+chengji.getFbsj()+"','"+chengji.getFbr()+"')";
		
			
			db.update(sql);
			//db.commit();
			db.close();
		
		}
	 public void  modify(chengji chengji) throws Exception{//修改成绩
			db=new DBO();
		   db.open();
			
			String sql = "update chengji set  zy='"+chengji.getZy()+"',cj='"+chengji.getCj()+"',xs='"+chengji.getXs()+"',fbsj='"+chengji.getFbsj()+"',fbr='"+chengji.getFbr()+"' where cjid ='"+chengji.getCjid()+"'";
		
			
			db.update(sql);
			//db.commit();
			db.close();
		
		}
	 public void  delete(String keyid) throws Exception{//删除成绩
			db=new DBO();
		        db.open();
			
			String sql = "delete from chengji where cjid='"+keyid+"'";
		
			
			db.update(sql);
			//db.commit();
			db.close();
		
		}
	 public ResultSet  qlist(String sl) throws Exception{//查询成绩
		   db=new DBO();
		   db.open();
		   String sql="select * from chengji where  1=1 ";
		if(!sl.equals("")){
			sql+=sl;
			
		}
		   System.out.println("sql="+sql);