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using Db4objects.Db4o;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Web;
public class DB4OServer {
IObjectServer _server;
public DB4OServer() {
if (_server == null) {
public DB4OServer(string dbPath) {
if (_server == null) {
void Connect() {
if (_server == null) {
if (ConfigurationManager.ConnectionStrings["ObjectStore"] == null) {
throw new InvalidOperationException("Can't find a connection string for the object store. Please be sure a connection exists called ObjectStore. You can set this to be |DataDirectory|MyStore.db4o");
string _dbPath = System.Configuration.ConfigurationManager
//check to see if this is pointing to data directory
//change as you need btw
if (_dbPath.Contains("|DataDirectory|")) {
//we know, then, that this is a web project
//and HttpContext is hopefully not null...
_dbPath = _dbPath.Replace("|DataDirectory|", "");
string appDir = HttpContext.Current.Server.MapPath("~/App_Data/");
_dbPath = Path.Combine(appDir, _dbPath);
public void Connect(string dbPath) {
_server = Db4oFactory.OpenServer(dbPath, 0);
db =_server.OpenClient();
private IObjectContainer db;
public IObjectContainer DB {
get {
return db;
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