/////////////////////////////////////////////////////////////////////////////////////
#region [ Load/Save Database Methods ]
/// <summary>
/// Loads database from file.
/// </summary>
///
private void LoadDatabase(string filename, string caption, bool silent = false)
{
string progressInfo = "Loading database from '" + filename + "'...";
// Remove children from client area (probably referring to the contents
// of the current database)
//
UnloadAllMdiChildForms();
// Create progress bar
//
MyProgressBar progress = new MyProgressBar(this, progressInfo);
Exception lastException = null;
VideoRentalOutlet loadedStore = null;
string elapsedTime = string.Empty;
// Deserialize database using our file stream with progress info.
//
try
{
FileInfo fileInfo = new FileInfo(filename);
long fileLength = fileInfo.Exists ? fileInfo.Length : 0;
using (FileStreamWithProgressBar fs = new FileStreamWithProgressBar(
filename, FileMode.Open, progress, fileLength)
)
{
loadedStore = VideoRentalOutlet.Deserialize(fs);
fs.StopTimer();
elapsedTime = " in " + fs.VerboseElapsedTime;
}
}
catch (Exception ex)
{
lastException = ex;
}
progress.Quit();
if (loadedStore != null)
{
VideoStore = loadedStore;
VideoStore.Changed += VideoStore_Changed;
string info = VideoStore.TotalRecordsCount.ToString()
+ " records loaded from '" + filename + "'" + elapsedTime;
if (silent)
{
this.InfoMessage = info;
}
else
{
info += "\n\n\n" + VideoStore.StatisticsInfo(info.Length) + "\n";
MessageBox.Show(info, caption,
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
UpdateTitle();
}
else if (lastException != null)
{
MessageBox.Show(
"There was an error while loading database.\n\n"
+ "Filename: " + filename + "\n\n"
+ "System Message:\n\n"
+ lastException.Message,
caption, MessageBoxButtons.OK, MessageBoxIcon.Hand);
}
}
/////////////////////////////////////////////////////////////////////////////////////
#region [ Methods Displaying Database Info and Contents ]
/// <summary>
/// Dumps full contents of database to file and shows the report in report box.
/// </summary>
///
private void DumpDatabase()
{
string progressInfo = "Dumping database contents as text...";
// Create progress bar
//
MyProgressBar progress = new MyProgressBar(this, progressInfo);
progress.Minimum = 0;
progress.Maximum = VideoStore.TotalRecordsCount;
StringBuilder sb = new StringBuilder();
sb.AppendLine();
sb.AppendLine("VROLib Database Format v" + VideoStore.Version);
sb.AppendLine();
/////////////////////////////////////////////////////////////////////////////////
sb.AppendLine(VideoStore.FullInfo());
/////////////////////////////////////////////////////////////////////////////////
sb.AppendLine(VideoStore.Customers.FullInfo());
progress.Value += VideoStore.Customers.Count;
progress.Refresh();
/////////////////////////////////////////////////////////////////////////////////
sb.AppendLine(VideoStore.PriceList.FullInfo());
progress.Value += VideoStore.PriceList.Count;
progress.Refresh();
/////////////////////////////////////////////////////////////////////////////////
sb.AppendLine(VideoStore.Movies.FullInfo());
progress.Value += VideoStore.Movies.Count;
progress.Refresh();
/////////////////////////////////////////////////////////////////////////////////
sb.AppendLine(VideoStore.MovieExemplars.FullInfo());
progress.Value += VideoStore.MovieExemplars.Count;
progress.Refresh();
/////////////////////////////////////////////////////////////////////////////////
progress.Quit();
string report = sb.ToString();
try
{
System.IO.File.WriteAllText("VRO-dump.txt", report);
sb.AppendLine("Dump saved to 'VRO-dump.txt'");
report = sb.ToString();
}
catch {}
ShowReport("Video Rental Outlet - Database Text Dump", report);
}
/////////////////////////////////////////////////////////////////////////////////////
#region [ Initialize Test Database and Add Test Records to Database Methods ]
/// <summary>
/// Initializes sample database using VRO_TestSuite (from ID132V Lab3a).
/// </summary>
///
private void InitializeTestDatabase()
{
DialogResult answer = MessageBox.Show(
"You are about to delete all current data!\n\nAre you sure?",
"Initialize Sample Database",
MessageBoxButtons.YesNo, MessageBoxIcon.Warning,
MessageBoxDefaultButton.Button2);
if (answer != DialogResult.Yes)
{
return;
}
UnloadAllMdiChildForms();
// Create progress bar
//
MyProgressBar progress = new MyProgressBar(this, "Initializing database...");
progress.Minimum = 0;
progress.Maximum = 100;
string report = null;
try
{
VRO_TestSuite.StringWriter sb = new VRO_TestSuite.StringWriter();
VRO_TestSuite.TestClient_VRO test = new VRO_TestSuite.TestClient_VRO(sb);
sb.WriteLine();
sb.WriteLine("Initializing Sample Database...");
test.CreateSampleDatabase();
progress.Value = 100;
progress.Refresh();
report = sb.ToString();
if (test.VideoStore != null)
{
VideoStore = test.VideoStore;
VideoStore.Changed += VideoStore_Changed;
UpdateTitle();
}
}
catch (Exception ex)
{
report = ex.ToString();
}
progress.Quit();
try
{
System.IO.File.WriteAllText("VRO-test.txt", report);
report += "Report saved to to 'VRO-Test.txt'";
}
catch {}
ShowReport("Video Rental Outlet - Test Suite Report", report);
}
/////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Adds number of test records to existing database.
/// </summary>
///
private void AddTestRecordsToDatabase(int extraRecords = 100)
{
DialogResult answer = MessageBox.Show(
"You are about to add random data to database!\n\nAre you sure?",
"Add Test Records",
MessageBoxButtons.YesNo, MessageBoxIcon.Warning,
MessageBoxDefaultButton.Button2);
if (answer != DialogResult.Yes)
{
return;
}
string progressInfo = "Adding random records to existing database...";
// Remove children from client area (probably referring to the contents
// of the current database)
//
UnloadAllMdiChildForms();
// Create progress bar
//
MyProgressBar progress = new MyProgressBar(this, progressInfo);
// Add records using VRO_TestSuite
//
try
{
// Create VRO test suite that will be used to add records to existing databse
//
VRO_TestSuite.StringWriter sb = new VRO_TestSuite.StringWriter();
VRO_TestSuite.TestClient_VRO test = new VRO_TestSuite.TestClient_VRO(sb);
test.VideoStore = this.VideoStore;
// Add records and maintain progress bar every 5th added record
//
for (int i = 1; i <= extraRecords; ++i)
{
if (i % 5 == 4)
{
progress.Value = i;
progress.Refresh();
Application.DoEvents(); // increase responsiveness
}
try
{
test.AddTestRecords();
}
catch
{
// Ignore any database violations as we try to insert random data
}
}
this.InfoMessage = "Database now contains " + VideoStore.TotalRecordsCount
+ " records";
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString(), "Error",
MessageBoxButtons.OK, MessageBoxIcon.Hand);
}
progress.Quit();
#if TEXTUI
if (MdiClient.ActiveChild != null)
{
MdiClient.Focus();
}
#endif
}
/////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Serializes database to file.
/// </summary>
///
private void SaveDatabase(string filename, string caption, bool silent = false)
{
// Create progress bar
string progressInfo = "Saving database to '" + filename + "'...";
// Create progress bar
//
MyProgressBar progress = new MyProgressBar(this, progressInfo);
Exception lastException = null;
bool succeded = false;
string elapsedTime = string.Empty;
// Serialize database using our file stream with progress info.
//
try
{
FileInfo fileInfo = new FileInfo(filename);
long fileLength = fileInfo.Exists ? fileInfo.Length : 0;
// Anticipate file length based on records count (if file length is 0
// or there was significant increase in database)
//
fileLength = Math.Max(VideoStore.TotalRecordsCount * 160, fileLength);
using (FileStreamWithProgressBar fs = new FileStreamWithProgressBar(
filename, FileMode.Create, progress, fileLength)
)
{
VideoStore.Serialize(fs);
succeded = true;
fs.StopTimer();
elapsedTime = " in " + fs.VerboseElapsedTime;
}
}
catch (Exception ex)
{
lastException = ex;
}
progress.Quit();
// Report status
//
if (succeded)
{
string info = VideoStore.TotalRecordsCount.ToString()
+ " records saved to '" + filename + "'" + elapsedTime;
if (silent)
{
this.InfoMessage = info;
}
else
{
MessageBox.Show(
info + "\n\n\n" + VideoStore.StatisticsInfo(info.Length) + "\n",
caption, MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
else if (lastException != null)
{
MessageBox.Show(
"There was an error while saving database.\n\n"
+ "Filename: " + filename + "\n\n"
+ "System Message:\n" + lastException.Message,
caption, MessageBoxButtons.OK, MessageBoxIcon.Hand);
}
}
