package com.dao;
import java.sql.*;
import javax.sql.DataSource;
import javax.naming.*;
public interface Dao {
    public static DataSource getDataSource(){
	   DataSource dataSource = null;
	   try {
	      Context context = new InitialContext();
	      dataSource = 
            (DataSource)context.lookup("java:comp/env/jdbc/webstoreDS");
	  }catch(NamingException ne){
	     System.out.println("异常:"+ne);
	  }
	  return dataSource;
	}
    public default Connection getConnection() throws SQLException {
	   DataSource dataSource = getDataSource();
	   Connection conn = null;
	   try{
		   conn =  dataSource.getConnection(); 
	   }catch(SQLException sqle){
		   System.out.println("异常:"+sqle);  
	   }
	   return  conn;
   }	
}