mysql - Java - How to check an existing user in the database (for a signup interface)? -


so here's i've done far. connected database username primary key.

protected void processrequest(httpservletrequest request, httpservletresponse response)         throws servletexception, ioexception {     response.setcontenttype("text/html;charset=utf-8");     try {         accounts bean = new accounts();         bean.setusername(request.getparameter("uname"));         bean.setname(request.getparameter("fname"));         bean.setemail(request.getparameter("email"));         bean.setpassword(request.getparameter("password"));         accountsdao ao = new accountsdao();         ao.addaccount(bean);         response.sendredirect("stream.jsp");     }     finally{      } }

what want is, when try register account same username/email of existing user in database, redirect another page using response.sendredireect("file.jsp"); require user register again username/email. thank in advance!

here accountsdao

public void addaccount(accounts bean) {     try {         bconnector = new dbconnector();         connection c = bconnector.getconnection();         string query = "insert account (username, name, email, password) values (?,?,?,?)";         preparedstatement preparedstatement = c.preparestatement(query);         preparedstatement.setstring(1, bean.getusername());         preparedstatement.setstring(2, bean.getname());         preparedstatement.setstring(3, bean.getemail());         preparedstatement.setstring(4, bean.getpassword());         preparedstatement.executeupdate();     } catch (sqlexception ex) {         logger.getlogger(accountsdao.class.getname()).log(level.severe, null, ex);     } }

once have username primary not allow insert duplicates . try this

try { //query insert username user }

if duplicate throw exception ora- handle exception using page redirect using catch block.

catch(exception e) { system.out.print(e); response.sendredirect("file.jsp"); }

update

declare integer variable check whether have inserted value . change return type of method addaccount(accounts bean) int

public int addaccount(accounts bean) {      int count=0;      try {         bconnector = new dbconnector();         connection c = bconnector.getconnection();         string query = "insert account (username, name, email, password) values (?,?,?,?)";         preparedstatement preparedstatement = c.preparestatement(query);         preparedstatement.setstring(1, bean.getusername());         preparedstatement.setstring(2, bean.getname());         preparedstatement.setstring(3, bean.getemail());         preparedstatement.setstring(4, bean.getpassword());         count=preparedstatement.executeupdate();     } catch (sqlexception ex) {         logger.getlogger(accountsdao.class.getname()).log(level.severe, null, ex);     }  return count; }

in servlet,

int count=0; try {         accounts bean = new accounts();         bean.setusername(request.getparameter("uname"));         bean.setname(request.getparameter("fname"));         bean.setemail(request.getparameter("email"));         bean.setpassword(request.getparameter("password"));         accountsdao ao = new accountsdao();         count=ao.addaccount(bean);         if(count>0){         response.sendredirect("stream.jsp"); \\success condition here         }         else{          response.sendredirect("file.jsp");   \\ failure condition here        }     }     catch(exception e) { system.out.print(e); }

hope helps!


Comments

Post a Comment

Popular posts from this blog

apache - Remove .php and add trailing slash in url using htaccess not loading css -

i have add following code htaccess file removing .php extension , add trailing slash urls. worked fine reduced page loading speed , css code not loading @ all. pages ugly. please help rewriteengine on rewritebase / ## hide .php extension snippet # externally redirect /dir/foo.php /dir/foo rewritecond %{the_request} ^[a-z]{3,}\s([^.]+)\.php [nc] rewriterule ^ %1/ [r,l] # add trailing slash rewritecond %{request_filename} !-f rewritecond %{request_uri} !/$ rewriterule . %{request_uri}/ [l,r=301] # internally forward /dir/foo /dir/foo.php rewritecond %{request_filename} !-d rewritecond %{request_filename}.php -f rewriterule ^(.*?)/?$ $1.php [l] we can rewrite urls using .htaccess files. before writing in .htaccess files need verify kind of server using. can check server adding a <?php phpinfo(); ?> in php page. ensure mod_rewrite module enabled in apache server. can identified checking phpinfo included page. common methods used url rewriting follows ...
Read more

javascript - jQuery show full size image on click -

pretty self explanatory not workking . i want display full image when user click on image... yes know there tons of plugins but i want keep simple. any idea ? css : .full { display: none; width: 500px; height: 500px; margin-left: 100px; margin-top: -300px; position: fixed; background-color: #f00; z-index: 6; } .thumbnail { width: 50px; height: 50px; } html: <img class="thumbnail" src="http://4.bp.blogspot.com/-uhbdp2esxng/txneptvi92i/aaaaaaaaaky/upfqis7zto0/s1600/rihanna-wallpaper.jpg"> jquery: $(document).ready(function() { $('.thumbnail').on('click', function() { var img = $('<img />',{src:this.src,'class':'full'}); $('.full').html(img).show(); console.log('done!'); }); }); try looking how jquery works. $(document).ready(function() { $('.thumbnail').on('click', function(...
Read more