using System;
using System.Xml;
using System.Data;
using System.Data.OleDb;

class ExportXML {
  
  static void Main(string[] args) {
    if (args.Length != 2) {
      System.Console.Out.WriteLine("usage: ExportXML AccessDbName OutputFile");
      return;
    }
    Console.WriteLine("Loading data ...");
    string conStr = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + args[0];
    DataSet ds = LoadData(conStr);
    if (ds != null) {
      Console.WriteLine("Writing data ...");
      ds.WriteXml(args[1],XmlWriteMode.WriteSchema); //write schema and data
    } else {
      Console.WriteLine("Could not load data!");
    }
  }

  // Loads all the data using the given connection string
  static DataSet LoadData(string connStr) {
    OleDbConnection conn = null;
    DataSet ds = null;
    try {
      conn = new OleDbConnection(connStr);
      OleDbDataAdapter adapter = new OleDbDataAdapter();
      adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey;
      conn.Open();
      
      if (conn.Database == null || conn.Database == "") ds = new DataSet();
      else ds = new DataSet(conn.Database);

      //load all user table names
      DataTable schemaTable = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, 
        new object[] {null, null, null, "TABLE"});
        
      //create 'select *' statements (for every found table) and fill DataSet
      adapter.SelectCommand = conn.CreateCommand();
      for(int i = 0; i < schemaTable.Rows.Count; i++) {
        string tableName = schemaTable.Rows[i]["TABLE_NAME"].ToString();
        adapter.SelectCommand.CommandText = String.Format("SELECT * FROM {0};", tableName);
        adapter.Fill(ds, tableName);
      }
    } catch (Exception e) {
      HandleError(e);
    } finally {
      if (conn != null) 
        conn.Close();
    }
    return ds;
  }


  // displays an error message on the console
  static void HandleError(Exception e) {
    System.Console.Out.WriteLine(e);
  }
}