/// <summary>
/// Performs a checkpoint operation on the database.
/// </summary>
public void Checkpoint()
{
lock ( SyncLock )
{
Close(false);
sModified = "yes";
SaveProperties();
cCache.Open(false);
OpenScript();
}
}
/// <summary>
/// Opens the database files.
/// </summary>
/// <returns>True if operation is sucessful.</returns>
public bool Open()
{
lock( SyncLock )
{
bool newdata = false;
if (TracingHelper.TraceEnabled)
TracingHelper.Write();
if (!(new FileInfo(sFileProperties)).Exists)
{
Create();
// this is a new database
newdata = true;
}
// todo: some parts are not necessary for read-only access
LoadProperties();
if (bReadOnly == true)
{
dDatabase.SetReadOnly();
cCache = new Cache(sFileCache);
cCache.Open(true);
RunScript();
return false;
}
bool needbackup = false;
if (sModified.Equals("yes-new-files"))
{
RenameNewToCurrent(sFileScript);
RenameNewToCurrent(sFileBackup);
}
else if (sModified.Equals("yes"))
{
if (IsAlreadyOpen())
{
throw TracingHelper.Error(TracingHelper.DATABASE_ALREADY_IN_USE);
}
// recovering after a crash (or forgot to close correctly)
RestoreBackup();
needbackup = true;
}
sModified = "yes";
SaveProperties();
cCache = new Cache(sFileCache);
cCache.Open(false);
RunScript();
if (needbackup)
{
Close(false);
sModified = "yes";
SaveProperties();
cCache.Open(false);
}
OpenScript();
// this is a existing database
return newdata;
}
}
/// <summary>
/// Opens the database files.
/// </summary>
/// <returns>True if operation is sucessful.</returns>
public bool Open()
{
lock ( SyncLock )
{
bool newdata = false;
if (TracingHelper.TraceEnabled)
{
TracingHelper.Write();
}
if (!(new FileInfo(sFileProperties)).Exists)
{
Create();
// this is a new database
newdata = true;
}
// todo: some parts are not necessary for read-only access
LoadProperties();
if (bReadOnly == true)
{
dDatabase.SetReadOnly();
cCache = new Cache(sFileCache);
cCache.Open(true);
RunScript();
return(false);
}
bool needbackup = false;
if (sModified.Equals("yes-new-files"))
{
RenameNewToCurrent(sFileScript);
RenameNewToCurrent(sFileBackup);
}
else if (sModified.Equals("yes"))
{
if (IsAlreadyOpen())
{
throw TracingHelper.Error(TracingHelper.DATABASE_ALREADY_IN_USE);
}
// recovering after a crash (or forgot to close correctly)
RestoreBackup();
needbackup = true;
}
sModified = "yes";
SaveProperties();
cCache = new Cache(sFileCache);
cCache.Open(false);
RunScript();
if (needbackup)
{
Close(false);
sModified = "yes";
SaveProperties();
cCache.Open(false);
}
OpenScript();
// this is a existing database
return(newdata);
}
}