readcourse.java

网上选课系统

package student;
import java.io.*;
import java.text.*;
import java.util.*;
import java.sql.*; 
import java.net.*;
public class ReadCourse{
	public ResultSet result;
	public String semester;
	Connection con=null;
	
	public void setSemester(String semester){
		this.semester=semester;
	}
	
	public ResultSet getResult(){
		String sql;
		
		try{
			String ss=getClass().getResource("/").getPath();
            String ss1=ss.substring(1).replace("%20"," ");
            URL str=getClass().getResource("/");
		
		    String s=str.toString();
            String url0=s.substring(6);
            String url=url0.replace("%20"," ");
		
		    String constr="jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};"+
    "DBQ="+url+"/data/system";
    
			Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
	        con = DriverManager.getConnection(constr);
	        Statement smt = con.createStatement();
	        sql="select * from Course where semester='"+semester+"'";
	        result=smt.executeQuery(sql);
		}
		catch(SQLException e)
		{
			result=null;
		}	
		finally{
			return  result;
		} 
	}
	
	public void Close()
	{
		try{
		con.close();
		}
		catch(Exception e){
			System.out.print("");
		}
	}
}