mysql - data not getting inserted into database -


hi guys have strange problem.. in local server data getting inserted database on remote server data not getting inserted in database , dont know do, plz me, using mysql database, not getting error, here code 

enter code here     int res=0; try { string q2="select count(*) studentscoredetails student_id='"+username+"'                   , lo_id='"+lo_id+"' ,  group_id='"+g_id+"'"; statement stmt=con.createstatement(); resultset rs=stmt.executequery(q2);  while(rs.next()){     res=rs.getint(1); } }catch(sqlexception e1){     e1.printstacktrace(); } system.out.print(res+">>>>>>>>>>>>>>>>>>>>>>>>>>>>"); if(res>0){ string q="select percentage studentscoredetails       student_id='"+username+"' , lo_id='"+lo_id+"' ,  group_id='"+g_id+"'"; statement checkrow=con.createstatement(); resultset r=checkrow.executequery(q); string finish="not finished"; int p=0; while(r.next()){     if(p < r.getint(1) ){         p=r.getint(1);     }     if(p > 40){         finish="finished";     }     string q1="update   studentscoredetails set percentage='"+p+"', quiz_status='"+finish+"',retest='n' student_id='"+username+"' , lo_id='"+lo_id+"' ,  group_id='"+g_id+"'";     statement update=con.createstatement();     int j=update.executeupdate(q1);     system.out.print(j+"update success"); }  }else{      system.out.print(list.size()+"inside"); if(list.size()>0){            system.out.print(list.size()+"inside");   try{                   preparedstatement insertstdetails=con.preparestatement("insert                             studentscoredetails            (student_id,quiz_id,subject,topic,lo_name,percentage,timetaken,lo_id,group_id,quiz_status,r        etest) values (?,?,?,?,?,?,?,?,?,?,?)");     insertstdetails.setstring(1,username);      insertstdetails.setint(2,qid);      insertstdetails.setstring(3,subject);       insertstdetails.setstring(4,topic);      insertstdetails.setstring(5,lo);      insertstdetails.setint(6, percentage);      insertstdetails.setstring(7,timetakenstr);     insertstdetails.setint(8,lo_id);    insertstdetails.setint(9,g_id);    insertstdetails.setstring(10,quiz_status);   insertstdetails.setstring(11,"n");   int i=insertstdetails.executeupdate();   //system.out.print("execute"+i);    }catch(sqlexception e2){ e2.printstacktrace();   }  }  }


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