I can access HSQLDB(OOo Base) by JDBC, but unable to update it, HELP!!!

Question

here is a code to access HSQLDB (or OOo Base)
but unfortunately it can read the data only (and when i execute an update it fails to store them in next running...
here connection code...
public static void createConnection(){
        File defaultDataLocation = new File(getDatabasePath()+"/RamanInfo");
        defaultDataLocation.mkdir();
        defaultDataLocation = new File(getDatabasePath()+"/logs");
        defaultDataLocation.mkdir();
        try {
            Class.forName("org.hsqldb.jdbcDriver");
        }catch(Exception ex) {
            WriteToLog.writeToLog(ex.toString());
        ZipFile file = null; //For handling zip files
        ZipEntry ent = null;
        Enumeration en = null; //For the entries in the zip file
        BufferedOutputStream out = null; //For the output from the zip class
        InputStream in = null; //for reading buffers from the zip file
        int len; //General length counter for loops
        //Unzip zip file, via info from
        //http://www.devx.com/getHelpOn/10MinuteSolution/20447
        try{
            File db=new File(ConnectionManagement.getDatabasePath()+"/RamanInfo");
            if(!db.exists()){
                WriteToLog.writeToLog("Create a Database");
                //Open the zip file that holds the OO.Org Base file
                file = new ZipFile(ConnectionManagement.getDatabasePath()+"/RamanInfo.odb");
                //Get file entries from the zipfile and loop through all of them
                en = file.entries();
                while (en.hasMoreElements()) {
                    //Get the current element
                    ent = (ZipEntry)en.nextElement();
                    //If the file is in the database directory, extract it to our
                    //temp folder using the temp filename above as a prefix
                    if (ent.getName().startsWith("database/")) {
                        byte[] buffer = new byte[1024];
                        //Create an input stream file the file entry
                        in = file.getInputStream(ent);
                        //Create a output stream to write out the entry to, using the
                        //temp filename created above
                        out = new BufferedOutputStream(new FileOutputStream(ConnectionManagement.getDatabasePath()+"/RamanInfo/" + dbName + "." + ent.getName().substring(9)));
                        //Read the input file into the buffer, then write out to
                        //the output file
                        while((len = in.read(buffer)) >= 0){
                            out.write(buffer, 0, len);
                        //close both the input stream and the output stream
                        out.close();
                        in.close();
                //Close the zip file since the temp files have been created
                file.close();
            //Create our JDBC connection based on the temp filename used above
            try {
                ConnectionManagement.con = DriverManager.getConnection("jdbc:hsqldb:file:"+ConnectionManagement.getDatabasePath()+"/RamanInfo/" + dbName, "SA", "");
                ConnectionManagement.stmt=ConnectionManagement.con.createStatement();
            }catch (SQLException sqlex) {
                WriteToLog.writeToLog(sqlex.toString());
        }catch(IOException ioex){
            WriteToLog.writeToLog(ioex.toString());
    }and here an update code
public static int execQuery(String query){
        try{
            int result=ConnectionManagement.stmt.executeUpdate(query); // execute a query
            return result;
        }catch(SQLException sqlex){// an error is occured
            WriteToLog.writeToLog(sqlex.toString());
            return 0; //no updates occred
    }calling method is as follows:
execQuery("INSERT INTO \"branches\"(\"branch\") VALUES('Slemany')";it stores the data until exiting a program, when i exit a program
all stored data will be loss...
can any one help me to be able to store to the database????

Answer 1

OOOOOOOOoo
i fixed the error..
the error was about closing....
during exiting the connection...
you should run this statement (stmt.executeUpdate("shutdown");)
before closing it...
since the HSQLDB will not save updates in the dbName.data file, during running, but it keeps them inside the dbName.log file, but during shutting down it will save them inside dbName.data....
thank you very much...