java.sql.SQLException: Invalid cursor position -


i created simple application lets users purchase tickets. however, have run error whenever try purchase "n" number of tickets. now, know need crs.next() statement while operating databases, have used number of times reason doesn't work here. gives me java.sql.sqlexception: invalid cursor position error.

this code snippet inserting ticket.

public void buyticket(int id,int n,int price) throws sqlexception{      crs.setcommand("select payid paymentinfo account = '"+2134541+"'");     crs.execute();     crs.next();     payid = crs.getint("payid");       for(int i=0;i<n;i++){      crs.setcommand("insert tickets (tickettype,eventid,userid,payid,price) values ("+false+","+id+             ","+ loginbean.getuid() + ","+payid+","+price+")");      crs.execute();     crs.next();     }      crs.setcommand("update events set maxtickets = maxtickets - "+n+"where eventid = "+eb.geteventid());     crs.execute();     crs.next();  }

the problem occurs inside for loop.the payid set , using payid try insert ticket table. if place breakpoint @ crs.next() statement, data entered. without it, gives me exception. thank help

crs initialization

cachedrowset crs = rowsetprovider.newfactory().createcachedrowset();

    crs.seturl("jdbc:derby://localhost:1527/events ticket management");      crs.setusername("x");      crs.setpassword("x");

update

after placing insert statement in try-catch block, tickets entered database, update crashes now, giving java.lang.nullpointerexception.

the method works temporary fix exception caught. doesn't let me set "n" number of tickets , 2 tickets! giving java.lang.nullpointerexception because wasn't setting id eventid. kind of sloppy side. 

   public void buyticket(int id,int n,int price) throws sqlexception{     crs.setcommand("select payid paymentinfo account = '"+account+"'");     crs.execute();     crs.next();     payid = crs.getint("payid");      try{     for(int i=0;i<n;i++){      crs.setcommand("insert tickets (tickettype,eventid,userid,payid,price) values ("+false+","+id+             ","+ loginbean.getuid() + ","+payid+","+price+")");      crs.execute();     crs.next();       }     }     catch(sqlexception e){      system.out.println("  message:    " + e.getmessage());     e = e.getnextexception();}      try{     crs.setcommand("update events set maxtickets = maxtickets - "+n+"where eventid = "+id);     crs.execute();     crs.next();     }     catch(sqlexception e ){      system.out.println("  message:    " + e.getmessage());     e = e.getnextexception();     }   }

Comments

Post a Comment

Popular posts from this blog

angularjs - ADAL JS Angular- WebAPI add a new role claim to the token -

i have created angular spa webapi backend using adal js authentication.as there no roles in ad, need manually add role claims in order give users access different api controllers. the roles stored in database. expecting inject claim through call webapi after authentication ad. webapi code might this. identity.addclaim(new claim("role", "user")); var ticket = new authenticationticket(identity, props); var accesstoken = startup.oauthbeareroptions.accesstokenformat.protect(ticket); is possible replace adal idtoken new token? is viable solution or there other better way handle this? as initial token generated azuread, possible edit token add new claim? appreciated. graph api supporting group claims. see here: http://justazure.com/azure-active-directory-part-4-group-claims/ if @ examples on page, users assigned groups , app can check group in claims. in current version of portal, need app manifest , modify it.
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more

php - CakePHP HttpSockets send array of paramms -

i problem when make request (i can request). $link = 'http://uri/path/?param1=1&sid=2&sid=3&sid=4' $http = $httpsocket = new httpsocket(); $res = $httpsocket->get($link); if check request pr($http); i see : [line] => /url/path/?param1=1&sid%5b0%5d=2&sid%5b1%5d=3&sid%5b2%5d=4 http/1.1 and i'm getting empty response because server doesn't know parameters sid%5b0%5d=2 when try send parameters array : $data = array('param1' => '1', 'sid' => array('2','3', '4')); i see same changes %5b0%5d - additional indexes. how fix it? unfortunately , can not change server side, if send request in browser, i'll normal response in json format. when make request, can parameters this: $param1 = $_get['param1']; $sid= $_get['sid']; tip: use diferente names parameters. have multiples sid. use sid1, sid2, sid3... update: can parameters this:...
Read more