connio.java

来自「成绩查询系统（学校期末的作业） Struts+jdbc+mysql+tomca」· Java 代码 · 共 96 行

package sfs.connection;

import java.lang.reflect.InvocationTargetException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;


public  abstract class ConnIO{
	public Connection conn;
	//连接数据库
	public ConnIO() throws ClassNotFoundException, SQLException{
		Class.forName("com.mysql.jdbc.Driver");
        String url="jdbc:mysql://localhost/my_score?useUnicode=true&characterEncoding=GB2312";			
        String name="root";
        String psw="root123";
        conn = (Connection) DriverManager.getConnection(url,name,psw);
	}
	
	//查询
	public List Query(String sql,String table) throws SQLException{
		List list=new ArrayList();
		ResultSet res;
		res = conn.createStatement().executeQuery(sql);		
		if(res.next()){
			res.beforeFirst();
			while(res.next()){
				list.add(ResToObj.excute(table,res));				
			}
			res.close();
			return list;
		}
		
		return null;	
	}
	public List QueryByNumber(String table,Object obj) throws SQLException, NumberFormatException, IllegalAccessException, InvocationTargetException, NoSuchMethodException{
		ObjToRes otr=new ObjToRes(table,obj);
		String sql=null; 
		String number=otr.getString("number");
		sql="select * from "+table+" where number="+number;
		List list=new ArrayList();
		ResultSet res;
		res = conn.createStatement().executeQuery(sql);		
		if(res.next()){
			res.beforeFirst();
			while(res.next()){
				list.add(ResToObj.excute(table,res));				
			}
			res.close();
			return list;
		}
		return null;	
		
	}
	public List QueryById(String table,Object obj) throws SQLException, IllegalAccessException, InvocationTargetException, NoSuchMethodException{
		ObjToRes otr=new ObjToRes(table,obj);
		String sql=null; 
		int id=otr.getInt("id");
		sql="select * from "+table+" where id="+id;
		List list=new ArrayList();
		ResultSet res;
		res = conn.createStatement().executeQuery(sql);		
		if(res.next()){
			res.beforeFirst();
			while(res.next()){
				list.add(ResToObj.excute(table,res));				
			}
			res.close();
			return list;
		}		
		return null;	
	}
	
	//删除
	public void DeletById(String table,Object obj) throws SQLException, IllegalAccessException, InvocationTargetException, NoSuchMethodException{
		ObjToRes otr=new ObjToRes(table,obj);
		String sql = null;  //初始化sql
		int id=otr.getInt("id");
		sql="delete from "+table+" where id="+id;
		conn.createStatement().execute(sql);
	}
	public void DeletByNumber(String table,Object obj) throws SQLException, IllegalAccessException, InvocationTargetException, NoSuchMethodException{
		ObjToRes otr=new ObjToRes(table,obj);
		String sql = null;  //初始化sql
		String number=otr.getString("number");
		sql="delete from "+table+" where number="+number;
		conn.createStatement().execute(sql);
	}
	//增加更新操作
	public void SaveOrUpdate(String table,Object obj) throws SQLException, NumberFormatException, IllegalAccessException, InvocationTargetException, NoSuchMethodException{
		
		}
}