teldao.java

利用SQLServer2000实现电话本功能

import java.sql.*;
import java.util.ArrayList;
import java.util.List;
public class TelDAO {
	Statement stmt;
	public TelDAO() throws SQLException{
		this.stmt=CreateConnection.conn.createStatement();
	}
	public boolean insert(String name,String tel) throws SQLException{
		String sql="insert into tel values('"+name+"','"+tel+"')";
		int info=this.stmt.executeUpdate(sql);
		if(info>0){
			return true;
		}else{
			return false;
		}
	}
	
	public boolean update(int index,String name,String tel) throws SQLException{
		String sql="update tel set name='"+name+"',tel='"+tel+"' where id="+index;
		int info=this.stmt.executeUpdate(sql);
		return info>0;
	}
	
	public boolean delete(int id) throws SQLException{
		String sql="delete from tel where id='"+id+"'";
		int info=this.stmt.executeUpdate(sql);
		return info>0;
	}
	
	public List findByName(String name) throws SQLException{
		String sql="select * from tel where name='"+name+"'";
		ResultSet rs=this.stmt.executeQuery(sql);
		List telList=new ArrayList();
		while(rs.next()){
			TelBean telBean=new TelBean();
			telBean.setName(rs.getString("name"));
			telBean.setTel(rs.getString("tel"));
			telBean.setId(rs.getInt("id"));
			telList.add(telBean);
		}
		return telList;
	}
	
	public List findAll() throws SQLException{
		String sql="select * from tel order by name";
		ResultSet rs=this.stmt.executeQuery(sql);
		List telList=new ArrayList();
		while(rs.next()){
			TelBean telBean=new TelBean();
			telBean.setName(rs.getString("name"));
			telBean.setTel(rs.getString("tel"));
			telBean.setId(rs.getInt("id"));
			telList.add(telBean);
		}
		return telList;
	}
}