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  • Struts2 example, not inserting records in mysql database because connection object is getting null

    - by Jugal
    This Code is working fine with simple application so the drivers are fine. so why the connection object is not able to initialise with drivers. import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.Statement; import com.opensymphony.xwork2.ActionSupport; public class Insert extends ActionSupport { public String execute() throws Exception, SQLException { String sql = ""; String url = "jdbc:mysql://localhost:3306/test"; //String dbName = "test"; String driverName = "org.gjt.mm.mysql.Driver"; String userName = "root"; String password = "root"; Connection con=null; Statement stmt=null; try { Class.forName(driverName).newInstance(); con = DriverManager.getConnection(url, userName, password); stmt = con.createStatement(); } catch (Exception e) { System.out.println(e.getMessage()); } }

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  • how to create a JSON object in action class of JAVA

    - by Jugal
    I want to create a JSON object. I have tried the following myString=new JSONObject().put("JSON", sampleClass).toString(); but mystring gives me {"SampleClass@170f98"}. I also tried the following XStream xsStream=new XStream(new JsonHierarchicalStreamDriver()); SampleClass sampleClass=new SampleClass(userset.getId(),userset.getUsername()); myString=xsStream.toXML(sampleClass); It works but when i use getJSON in javascript to get myString it does not work.

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  • Session does not giving right records?

    - by Jugal
    I want to keep one session, but when I rollback transaction then transaction gets isActive=false, so I can not commit and rollback in next statements by using same transaction. then I need to create new transaction but what is going wrong here ? var session = NHibernateHelper.OpenSession();/* It returns new session. */ var transaction1 = session.BeginTransaction(); var list1 = session.Query<Make>().ToList(); /* It returs 4 records. */ session.Delete(list1[2]); /* After Rollback, transaction is isActive=false so I can not commit * and rollback from this transaction in future. so I need to create new transaction. */ transaction1.Rollback(); var transaction2 = session.BeginTransaction(); /* It returns 3 records. * I am not getting object(which was deleted but after that rollback) here why ? */ var list2 = session.Query<Make>().ToList(); Anyone have idea what is going wrong here ? I am not getting deleted object which was rollback.

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  • c++ unicode writing is not working

    - by Jugal Kishore
    I am trying to write some Russian unicode text in file by wfstream. Following piece of code has been used for it. wfstream myfile; locale AvailLocale("Russian"); myfile.imbue(AvailLocale); myfile.open(L"d:\\example.txt",ios::out); if (myfile.is_open()) { myfile << L"?????? ????" <<endl; } myfile.flush(); myfile.close(); Something unrecognizable is written to the file by executing this code, I am using VS 2008.

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