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// ============================================================================================
// .NET API for EJDB database library http://ejdb.org
// Copyright (C) 2012-2013 Softmotions Ltd <info@softmotions.com>
//
// This file is part of EJDB.
// EJDB is free software; you can redistribute it and/or modify it under the terms of
// the GNU Lesser General Public License as published by the Free Software Foundation; either
// version 2.1 of the License or any later version. EJDB is distributed in the hope
// that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
// License for more details.
// You should have received a copy of the GNU Lesser General Public License along with EJDB;
// if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
// Boston, MA 02111-1307 USA.
// ============================================================================================
using System;
using System.Runtime.InteropServices;
namespace Ejdb.DB {
public class EJDB : IDisposable {
//Open modes
public const int JBOREADER = 1 << 0;
public const int JBOWRITER = 1 << 1;
public const int JBOCREAT = 1 << 2;
public const int JBOTRUNC = 1 << 3;
public const int JBONOLCK = 1 << 4;
public const int JBOLCKNB = 1 << 5;
public const int JBOTSYNC = 1 << 6;
public const int DEFAULT_OPEN_MODE = (JBOWRITER | JBOCREAT);
public const string EJDB_LIB_NAME = "tcejdb";
IntPtr _db = (IntPtr) 0x0;
#region Functions
[DllImport(EJDB_LIB_NAME, EntryPoint="ejdbnew")]
static extern IntPtr _ejdbnew();
[DllImport(EJDB_LIB_NAME, EntryPoint="ejdbdel")]
static extern IntPtr _ejdbdel(IntPtr db);
[DllImport(EJDB_LIB_NAME, EntryPoint="ejdbopen", CharSet=CharSet.Auto)]
static extern bool _ejdbopen(IntPtr db, string path, int mode);
[DllImport(EJDB_LIB_NAME, EntryPoint="ejdbclose")]
static extern bool _ejdbclose(IntPtr db);
[DllImport(EJDB_LIB_NAME, EntryPoint="ejdbisopen")]
static extern bool _ejdbisopen(IntPtr db);
[DllImport(EJDB_LIB_NAME, EntryPoint="ejdbecode")]
static extern int _ejdbecode(IntPtr db);
[DllImport(EJDB_LIB_NAME, EntryPoint="ejdberrmsg")]
static extern string _ejdberrmsg(int ecode);
#endregion
/// <summary>
/// Gets the last DB error code or <c>null</c> if underlying native database object does not exist.
/// </summary>
/// <value>The last DB error code.</value>
public int? LastDBErrorCode {
get {
return (_db.ToInt32() != 0x0) ? (int?) _ejdbecode(_db) : null;
}
}
/// <summary>
/// Gets the last DB error message or <c>null</c> if underlying native database object does not exist.
/// </summary>
public string LastDBErrorMsg {
get {
int? ecode = LastDBErrorCode;
return ecode != null ? _ejdberrmsg((int) ecode) : null;
}
}
/// <summary>
/// Gets a value indicating whether this EJDB databse is open.
/// </summary>
/// <value><c>true</c> if this instance is open; otherwise, <c>false</c>.</value>
public bool IsOpen {
get {
return _ejdbisopen(_db);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="Ejdb.DB.EJDB"/> class.
/// </summary>
/// <param name="path">The main database file path.</param>
/// <param name="omode">Open mode.</param>
public EJDB(string path, int omode) {
bool rv;
_db = _ejdbnew();
if (_db.ToInt32() == 0x0) {
throw new EJDBException("Unable to create ejdb instance");
}
try {
rv = _ejdbopen(_db, path, omode);
} catch (Exception) {
Dispose();
throw;
}
if (!rv) {
throw new EJDBException(this);
}
}
~EJDB() {
Dispose();
}
public void Dispose() {
if (_db.ToInt32() != 0x0) {
IntPtr db = _db;
_db = (IntPtr) 0x0;
if (db.ToInt32() != 0x0) {
_ejdbdel(db);
}
}
}
}
}
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