怎么提高向mysql中插入数据的效率

<span style="font-size:9pt;line-height:1.5;"> String[] filelist = file.list();</span>

   for(String filename : filelist){            
   BufferedReader br = new BufferedReader(new FileReader(path+"/"+filename));
   String line = null;
   //得到movie的id
   line = br.readLine();
   String[] firstline = line.split(":");
   String movieid = firstline[0];
                
   while ((line = br.readLine()) != null){
       String[] lines = line.split(",");
       String userid = lines[0];
       String rating = lines[1];
       String date = lines[2]; 
           String sql = "insert into netflixdata(movieid,userid,rating,date) values('"+movieid+"','"+userid+"','"+rating+"','"+date+"')";
       int flag = stmt.executeUpdate(sql);
       if(flag == 0){
           System.out.println("添加失败");
       }
       else{
           System.out.println("添加成功");
       }

主要代码如上，（本人数据库新手）要把Netflix的数据集导入mysql中，按上面的代码运行，发现插入数据比较慢，五个半小时才插入100w条数据（4核i5，cpu 3.1GHz）