No record may not be added to the QueueDatabase


It is very simple and basic, but when I add a record to a database with the 'tail' access method, he throws a System.ArgumentNullException. I write a modified test of a "excs_access" code, below:

/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2009, 2013 Oracle and/or its affiliates.  All rights reserved.
*
*/
using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using BerkeleyDB.

namespace Test_QueueDatabase
{
Class Program
{
public static void Main (string [] args)
{
QueueDatabase queueDB;
QueueDatabaseConfig queueConfig;
chamois of the chain, dbFileName, keyString;

Try
{
String pwd = Environment.CurrentDirectory;
pwd = Path.Combine (pwd, "..");
pwd = Path.Combine (pwd, "..");
If (IntPtr.Size is 4)
pwd = Path.Combine (pwd, "Win32");
on the other
pwd = Path.Combine (pwd, "x 64");
#if DEBUG
pwd = Path.Combine (pwd, "Debug");
#else
pwd = Path.Combine (pwd, "Libération");
#endif
pwd += ';' + Environment.GetEnvironmentVariable ("PATH");
Environment.SetEnvironmentVariable ("PATH", pwd);
}
catch (System.Exception e)
{
Console.WriteLine)
"Cannot set the PATH environment variable.");
Console.WriteLine (e.message);
return;
}

Try
{
dbFileName = "queue.db";
If (args. Length > 0)
dbFileName = args [0];
}
catch
{
Usage();
return;
}

/ * Optiionally remove the existing database file. */
If (File.Exists (dbFileName))
{
While (true)
{
Console.Write
("{0} already exists.  Delete it? (y/n) ", dbFileName);
Buff = console. ReadLine (). ToLower();
If (buff == 'y' | buff == "n")
break;
}

If (buff == 'y')
{
Try
{
File.Delete (dbFileName);
}
catch
{
Console.WriteLine ("Unable to delete {0}.", dbFileName);
return;
}
}
}

/ * Sets up the database. */
queueConfig = new QueueDatabaseConfig();
queueConfig.ErrorPrefix = "Test_QueueDatabase";
queueConfig.Creation = CreatePolicy.IF_NEEDED;
queueConfig.CacheSize = new CacheInfo (0, 64 * 1024, 1);
queueConfig.PageSize = 8 * 1024;

/ * Create and open a new database in the file. */
Try
{
queueDB = QueueDatabase.Open (dbFileName, queueConfig);
}
catch (System.Exception e)
{
Console.WriteLine ("Error opening {0}.", dbFileName);
Console.WriteLine (e.message);
return;
}

While (true)
{
Console.Write ("[empty to leave line] button >");
KeyString = console. ReadLine ();
If (chaine_cle == "")
break;

Data DatabaseEntry = new DatabaseEntry (Encoding.ASCII.GetBytes (keyString));
Here, it throws an exception because the key of the record. Data are null (it should be the record number bit array).
Error in the statement «back BitConverter.ToUInt32 (key.» Data, 0)"which will be called by Append (data).
queueDB.Append (data);
}

While (queueDB.Length > 0)
{
KeyValuePair < uint, DatabaseEntry > p = queueDB.Consume (false);
Console.WriteLine ("{0}: {1}",)
p.Key, Encoding.ASCII.GetString (p.Value.Data));
}

Console.Write ("press any key to exit >");
Return (true);

/ * Close the slider and the database. */
queueDB.Close ();
}

utility #region
public static Usage() Sub
{
Console.WriteLine)
("Use: [database] Test_QueueDatabase");
}
utility #endregion

}
}

Hello

Queue database is used to store fixed-length records, so you must set the record length before opening the queue database, but I didn't know that, in your code. To see the setting of the record length, please visit QueueDatabaseConfig.Length.

Also QueueDatabase.Length does not tell you the number of records, it tells you just the record length. If you want to know the number of records, see QueueStats.nData.

Kind regards

Winter, Oracle Berkeley DB

Tags: Database

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