Can anybody help telling me what is wrong with my code? I am trying to connect to SQLite database, and executing some queries. when trying to create and open the database, create and insert the table, no exception returned. but when I try to execute delete statement,
DatabaseIOException: File system error (12)
always returned. I don't know the cause of the exception exactly. would you tell me what usually cause this kind of exception? I don't even know when I need to close the database and when I don't need to. this solution also makes me confused.
here is my code:
public class DatabaseManager {
Logger log = new Logger();
Database db;
public DatabaseManager() {
createDatabase();
}
private void createDatabase() {
// Determine if an SDCard is present
boolean sdCardPresent = false;
String root = null;
Enumeration enum = FileSystemRegistry.listRoots();
while (enum.hasMoreElements()) {
root = (String) enum.nextElement();
if(root.equalsIgnoreCase("sdcard/")) {
sdCardPresent = true;
}
}
if(!sdCardPresent) {
alert("This application requires an SD card to be present. Exiting application...");
}
else {
try {
URI uri = URI.create("/SDCard/databases/MyAdvanceUI/myadvanceui.db");
db = DatabaseFactory.openOrCreate(uri);
db.close();
//alert("Database OK!");
} catch (Exception e) {
// TODO Auto-generated catch block
//alert("Exception in createDatabase(): " + e);
}
}
}
private void alert(final String message) {
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
Dialog.inform(message);
System.exit(0);
}
});
}
private void createTableTask() {
try {
URI uri = URI.create("/SDCard/databases/MyAdvanceUI/myadvanceui.db");
db = DatabaseFactory.open(uri);
Statement st = db.createStatement("CREATE TABLE IF NOT EXISTS t_task (id INTEGER PRIMARY KEY AUTOINCREMENT, "
+ "client TEXT, task TEXT)");
st.prepare();
st.execute();
st.close();
db.close();
//alert("Table Task created!");
} catch (Exception e) {
// TODO: handle exception
//alert("Exception in createTableTask(): " + e);
}
}
private void insertTableTask() {
String[] clients = { "Budi Setiawan", "Dian Kusuma", "Joko Ahmad", "Titi Haryanto", "Wahyu" };
String[] tasks = {
"Penawaran terhadap instalasi server",
"Follow up untuk keperluan produk terbaru",
"Pendekatan untuk membina relasi",
"Penawaran jasa maintenance",
"Penawaran terhadap instalasi database"
};
try {
URI uri = URI.create("/SDCard/databases/MyAdvanceUI/myadvanceui.db");
db = DatabaseFactory.open(uri);
for(int i = 0; i < clients.length; i++) {
Statement st = db.createStatement("INSERT INTO t_task (client, task) VALUES (?, ?)");
st.prepare();
st.bind(1, clients[i]);
st.bind(2, tasks[i]);
st.execute();
st.close();
}
db.close();
} catch (Exception e) {
// TODO: handle exception
//alert("Exception in insertTableTask(): " + e);
}
}
public void loadInitialData() {
createTableTask();
insertTableTask();
}
public Cursor getTasks() {
// TODO Auto-generated method stub
Cursor results = null;
try {
URI uri = URI.create("/SDCard/databases/MyAdvanceUI/myadvanceui.db");
db = DatabaseFactory.open(uri);
Statement st = db.createStatement("SELECT client, task FROM t_task");
st.prepare();
results = st.getCursor();
return results;
} catch (Exception e) {
// TODO: handle exception
//alert("Exception: " + e);
}
return results;
}
public void delete(String string) {
// TODO Auto-generated method stub
try {
URI uri = URI.create("/SDCard/databases/MyAdvanceUI/myadvanceui.db");
db = DatabaseFactory.open(uri);
Statement st = db.createStatement("DELETE FROM t_task WHERE client=?");
st.prepare();
st.bind(1, string);
st.execute();
} catch (Exception e) {
// TODO: handle exception
alert("Exception: " + e);
}
}
}
thank you for your help.
I don't see that you close the statement and close the database after select and delete actions. Most probably you can't open database because it wasn't closed correctly.
Big warning SD card isn't available when user mounted devices to PC as external drive. Some devices are going without SD card preinstalled. DB operations are really slow on 5 OS devices. Your alert method code wan't close db what could be issue to open it after on the next application start.
Warning As #pankar mentioned in comment you should add finally {} where you will close resources for sure. In your current implementation if you get exception in execution you will never close database.
Big improvements You don't need to create and prepare statement every loop. Just do it before for. Do bind and execute every loop. And close statement after for.
Improvements You could keep one opened db during application run cycle. It will save you some line of code and time for opening closing.
Notation It's bad practice to have parameter named like 'string'. I would rename it to something more meaningful.
Related
I am creating a Javafx chat app which also allows for file transfer. My issue is I open a FileOutputStream for the received file within the below method. I can see my listener.statusTransferring() updating the UI only if I enable Platform.runLater. I think I now need to enable the same on the fos.write(b, 0, tmpTransferred) within the while loop but don't know how to do this. I have tried unsuccessfully wrapping the whole method within Platform runlater. Note: If I don't use platform runlater I don't get any errors however the UI does not update until the file transfer is complete eg listener.statusCompleted() is called;. The error I get now as a result of the fos being in Platform runlater. is below.. Line 185 is fos.write(b, 0, tmpTransferred); The other listener calls appear to work fine. Just not listener.statusTransferring(); or listener.transferUpdate(); which utilise the fos. Any help will be greatly appreciated. Also for your own sanity I am a self taught google programmer. Yep the worst kind I am sure. Thanks in advance.
Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at net.thebowdens.net.FileReceiver.transfer(FileReceiver.java:185)
at net.thebowdens.net.DefaultMessageResponder.fileSend(DefaultMessageResponder.java:543)
public boolean transfer() {
listener.statusConnecting();
received = false;
cancel = false;
try {
if (sSock != null) {
sock = sSock.accept();
listener.statusTransferring();
Platform.runLater(() ->{
try {
fos = new FileOutputStream(file);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
});
is = sock.getInputStream();
final byte[] b = new byte[1024];
transferred = 0;
percent = 0;
int tmpTransferred = 0;
int tmpPercent = 0;
int transCounter = 0;
bCounter.prepare();
while (!cancel && (tmpTransferred = is.read(b)) != -1) {
fos.write(b, 0, tmpTransferred);
transferred += tmpTransferred;
percent = (int) ((transferred * 100) / size);
bCounter.addBytes(tmpTransferred);
transCounter++;
if (percent > tmpPercent || transCounter >= 250) {
transCounter = 0;
tmpPercent = percent;
listener.transferUpdate();
}
}
if (!cancel && transferred == size) {
received = true;
listener.statusCompleted();
}
else {
listener.statusFailed();
}
}
}
catch (final IOException e) {
LOG.log(Level.SEVERE, e.toString());
listener.statusFailed();
}
finally {
stopReceiver();
cleanupConnections();
}
return received;
}
Keep in mind that you should use Platform.runLater only for updating the UI, everything else should be outside it otherwhise the UI will become unresponsive.
I suggest you to to refactor your code according to this.
Well after much discussion over the correct language and other issues I solved my problem of the UI updating. I had two issues. My choice selector and Filechooser methods were not on the Javafx application thread (hope this is the right terminology) so I had to do the following:
private ExecutorService executorService = Executors.newCachedThreadPool();
executorService.execute(new Runnable() {
#Override
public void run() {
Platform.runLater(() -> {
try {
receiveRequest(tmpUser, fileRes, user, fileName, size, fileHash);
} catch (IOException | ServerException | CommandException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
});
}
});
I then had to do the same within the Filechooser and file accept method for the transfer class UI to update
executorService.execute(new Runnable() {
#Override public void run() {
if (fileRes.transfer()) {
ui.showSystemMessage("Successfully received " + fileName +
" from " + user + ", and saved as " + fileRes.getFile().getName());
}
else {
ui.showSystemMessage("Failed to receive " + fileName + " from " + user);
fileRes.cancel();
}
}
});
}
I have a custom BizTalk 2013 R2 pipeline component that has several design-time properties defined. For some reason, BizTalk will load the design-time property values set in the VS pipeline designer but it ignores run-time values set in the BizTalk Admin Console. My component implements IPersistPropertyBag and I have verified that it is not throwing any exceptions.
While debugging the pipeline (attached to Isolated Host Instance), I noticed that BizTalk is only calling the Load method when the pipeline is instantiated. This only loads the VS designer values and BizTalk is supposed to then call the Load method again before calling Execute. Unfortunately, this is not happening.
[Edit] I did some more debugging and figured out that this only seems to be happening on the send pipeline for a two-way receive port. The receive pipeline loads both the design-time and run-time properties as expected.
Here is a sample of my code:
[ComponentCategory(CategoryTypes.CATID_PipelineComponent)]
[ComponentCategory(CategoryTypes.CATID_Encoder)]
[System.Runtime.InteropServices.Guid(COMPONENT_GUID)]
public class RhapsodyMessageEncoder : BasePipelineComponent, IBaseComponent, IComponentUI,
IPersistPropertyBag, Microsoft.BizTalk.Component.Interop.IComponent
{
...
public void Load(IPropertyBag propertyBag, int errorLog)
{
try
{
this.Enabled = Convert.ToBoolean(this.ReadPropertyBag(propertyBag, "Enabled"));
this.UsernameSSOKey = this.ReadPropertyBag(propertyBag, "UsernameSSOKey") as string;
this.PasswordSsoKey = this.ReadPropertyBag(propertyBag, "PasswordSsoKey") as string;
this.AffiliateAppName = this.ReadPropertyBag(propertyBag, "AffiliateAppName") as string;
}
catch (Exception e) { this.WriteErrorLog(e); }
}
public void Save(IPropertyBag propertyBag, bool clearDirty, bool saveAllProperties)
{
try
{
this.WritePropertyBag(propertyBag, "Enabled", this.Enabled);
this.WritePropertyBag(propertyBag, "UsernameSSOKey", this.UsernameSSOKey);
this.WritePropertyBag(propertyBag, "PasswordSsoKey", this.PasswordSsoKey);
this.WritePropertyBag(propertyBag, "AffiliateAppName", this.AffiliateAppName);
}
catch (Exception e) { this.WriteErrorLog(e); }
}
...
}
Read / Write Property bag helper methods:
protected virtual object ReadPropertyBag(IPropertyBag pb, string propName)
{
PropertyInfo pInfo = this.GetType().GetProperty(propName);
object currentValue = null;
object val = null;
if (pInfo != null)
currentValue = pInfo.GetValue(this, null);
try
{
pb.Read(propName, out val, 0);
}
catch (System.ArgumentException e)
{
System.Diagnostics.Trace.WriteLine(
"Argument Exception encountered: " + e.Message,
this.Name
);
}
catch (System.Exception e)
{
throw new System.ApplicationException("Can't read design time Properties", e);
}
return val ?? currentValue;
}
protected virtual void WritePropertyBag(IPropertyBag pb, string propName, object val)
{
try
{
object obj = val;
pb.Write(propName, ref obj);
}
catch (System.Exception e)
{
throw new System.ApplicationException("Can't write design time properties", e);
}
}
I have 2 servers in AD (2008R2)
On one of them I have shared folder (c:\Shared\dirForUserAAA ==> \DC1\dir1)
On other one I have c# program that must manage folder quota on \DC1\dir1
Is it possible and how it can be done?
I try to use this piece of code, but it works only on local paths :(
public static void SetQuotaToFolder(string UNCPathForQuota, int quotaLimitBytes)
{
if (!Directory.Exists(UNCPathForQuota))
{
Directory.CreateDirectory(UNCPathForQuota);
}
// Create our interface
IFsrmQuotaManager FSRMQuotaManager = new FsrmQuotaManagerClass();
IFsrmQuota Quota = null;
try
{
// First we need to see if there is already a quota on the directory.
Quota = FSRMQuotaManager.GetQuota(UNCPathForQuota);
// If there is quota then we just set it to our new size
Quota.QuotaLimit = quotaLimitBytes;
}
catch (COMException e)
{
unchecked
{
if (e.ErrorCode == (int)0x80045301)
{
// There is no quota on this directory so we need to create it.
Quota = FSRMQuotaManager.CreateQuota(UNCPathForQuota);
// And then set our desired quota
Quota.QuotaLimit = quotaLimitBytes;
}
else
{
// some other COM exception occured so we return the error
Console.WriteLine(e);
return;
}
}
}
catch (Exception e)
{
// Generic error handling would go here
Console.WriteLine(e);
return;
}
// and finally we commit our changes.
Quota.Commit();
}
}
Old Question, but if someone needs a hint:
Open a RemotePowershell on the server where your folders are saved. Then use the Cmdlets from here
Some code snippets:
Open Runspace:
public static Runspace CreateAndOpen(string domain, string username, string password, string computername)
{
string userName = username + "#" + domain;
var securePassword = password.ToSecureString();
PSCredential credential = new PSCredential(username, securePassword);
var connectionInfo = new WSManConnectionInfo(false, computername, 5985, "/wsman", shellUri, credential);
connectionInfo.AuthenticationMechanism = AuthenticationMechanism.Default;
connectionInfo.OpenTimeout = 2 * 60 * 1000; // 2 minutes
Runspace powershellRunspace = RunspaceFactory.CreateRunspace(connectionInfo);
powershellRunspace.Open();
return powershellRunspace;
}
Set a quota on a path
public void SetQuotaTemplateOnPath(Runspace runspace, string path, string template)
{
using (var pipe = runspace.CreatePipeline())
{
var newFsrmQuotaCommand = new Command("New-FsrmQuota");
newFsrmQuotaCommand.Parameters.Add("Path", path);
newFsrmQuotaCommand.Parameters.Add("Template", template);
newFsrmQuotaCommand.Parameters.Add("Confirm", false);
pipe.Commands.Add(newFsrmQuotaCommand);
var results = pipe.Invoke();
if (pipe.Error.Count > 0)
{
//Handle error
}
}
}
I don't have any knowledge on working with Sqlite database on Blackberry. Recently i delved into database with Blackberry. When i tried to create the database, the database gets successfully created on Simulator(Simulate-->ChangeSDCard-->MountDirectory) on Some particular folder.
Next when i try to Open the database for creating tables & inserting data--
String db_url ="file:///SDCard/Databases/"+"sampleTest.db";
db = DatabaseFactory.open(db_url);
It through the DatabaseException error with message :"Invalid path name. Path does not contains a proper root list. See FileSystemRegistry class for details."
Please help me !! What is going Wrong here.
First set Sdcard in Simulator:
Go Simulate-->change sdcard-->Add directories(sdcard folder path)
Write Query like this:
public Vector GetData()
{
Cursor c = null;
Statement st = null;
Vector tableVector=new Vector();
try
{
URI myURI = URI.create("/SDCard/" + "abc.db");
d = DatabaseFactory.open(myURI);
st= d.createStatement("Query"););
st.prepare();
c = st.getCursor();
Row r;
while(c.next())
{
r = c.getRow();
tableVector.addElement(r.getString(0));
}
}
catch ( Exception e )
{
System.out.println( e.getMessage() );
e.printStackTrace();
}
finally
{
try {
c.close();
} catch (DatabaseException e) {
e.printStackTrace();
}
try {
st.close();
} catch (DatabaseException e) {
e.printStackTrace();
}
try {
d.close();
} catch (DatabaseIOException e) {
e.printStackTrace();
}
}
return tableVector;
}
I have a Silverlight project which takes some encrypted string thru its Service Reference: DataService (service which is done in an ASP.NET project).
The method from TransactionServices.cs to get the encrypted string is:
public void GetEncryptedString(string original)
{
DataService.DataServiceClient dataSvc = WebServiceHelper.Create();
dataSvc.GetEncryptedStringCompleted += new EventHandler<SpendAnalyzer.DataService.GetEncryptedStringCompletedEventArgs>(dataSvc_GetEncryptedStringCompleted);
dataSvc.GetEncryptedStringAsync(original);
}
On completing, put the result in encodedString var (which is initialized with an empty value):
void dataSvc_GetEncryptedStringCompleted(object sender, SpendAnalyzer.DataService.GetEncryptedStringCompletedEventArgs e)
{
if (e.Error == null)
{
try
{
if (e.Result == null) return;
this.encodedString = e.Result;
}
catch (Exception ex)
{
Logger.Error("TransactionService.cs: dataSvc_GetEncryptedStringCompleted: {0} - {1}",
ex.Message, ex.StackTrace);
MessageBox.Show(ex.ToString());
}
}
}
Now I want to get the encoded string from my MainPage.xaml like:
TransactionService ts = new TransactionService();
ts.GetEncryptedString(url);
Console.WriteLine(ts.encodedString);
I do not uderstand why ts.encodedString is empty. When I do the debug I see that it actually prints out empty and AFTER that it goes to the void dataSvc_GetEncryptedStringCompleted to take the result and fill it.
Can you point me what I've done wrong? Is there a way to wait for the encodedString to be fetched and only after that to continue?
Thanks a lot.
When you call the ts.GetEncryptedString(url); you just started async operation. And therefor the value you are accessing is will be set only in the callback method.
But you access it before the value is modified by the callback.
The solution which I am using will looks similar to folowing:
Redefine the GetEncryptedString method signature.
public void GetEncryptedString(string original, Action callback)
{
DataService.DataServiceClient dataSvc = WebServiceHelper.Create();
dataSvc.GetEncryptedStringCompleted += (o,e) =>
{
dataSvc_GetEncryptedStringCompleted(o,e);
callback();
}
dataSvc.GetEncryptedStringAsync(original);
}
Call it like this:
ts.GetEncryptedString(url, OtherLogicDependantOnResult);
where
OtherLogicDependantOnResult is
void OtherLogicDependantOnResult()
{
//... Code
}