System.Data.SQLite

using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

// General Information about an assembly is controlled through the following 
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("System.Data.SQLite")]
[assembly: AssemblyDescription("ADO.NET 2.0 Data Provider for SQLite")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("http://sqlite-dotnet2.sourceforge.net")]
[assembly: AssemblyProduct("System.Data.SQLite")]
[assembly: AssemblyCopyright("Public Domain")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]

//  Setting ComVisible to false makes the types in this assembly not visible 
//  to COM componenets.  If you need to access a type in this assembly from 
//  COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]

// Version information for an assembly consists of the following four values:
//
//      Major Version
//      Minor Version 
//      Build Number
//      Revision
//
// You can specify all the values or you can default the Revision and Build Numbers 
// by using the '*' as shown below:
[assembly: AssemblyVersion("1.0.8.*")]

    /// </summary>
    private void InitializeForReader()
    {
      if (_isReaderOpen)
        throw new InvalidOperationException("DataReader already active on this command");

      if (_cnn == null)
        throw new InvalidOperationException("No connection associated with this Command");

      if (_cnn.State != ConnectionState.Open)
        throw new InvalidOperationException("Database is not open");

      int n;
      int x;

    /// <returns>Returns a SQLiteDataReader object</returns>
    protected override DbDataReader ExecuteDbDataReader(CommandBehavior behavior)
    {
      InitializeForReader();

      _cnn._sql.SetTimeout(_commandTimeout * 1000);

      try
      {
        SQLiteDataReader rd = new SQLiteDataReader(this, behavior);

        _isReaderOpen = true;
        
        return rd;
      }
      finally
      {
      }
    }

    /// <summary>
    /// Called by the SQLiteDataReader when the data reader is closed.
    /// </summary>
    internal void ClearDataReader()
    {

      return null;
    }

    /// <summary>
    /// Aggregate functions override this method to do their magic.
    /// </summary>
    /// <remarks>
    /// Don't call the ReturnXXX functions of the context object during this function call.  Save it for the Final() method.
    /// Typically you'll just be updating whatever you've placed in the contextData field and returning as quickly as possible.
    /// </remarks>
    /// <param name="args">The arguments for the command to process</param>
    /// <param name="nStep">The 1-based step number.  This is incrememted each time the step method is called.</param>
    /// <param name="contextData">A placeholder for implementers to store contextual data pertaining to the current context.</param>
    public virtual void Step(object[] args, int nStep, ref object contextData)
    {
    }

    /// <summary>
    /// Aggregate functions override this method to finish their aggregate processing.
    /// </summary>
    /// <remarks>
    /// This is where you will call one of the ReturnXXX methods of the context class.  If you implemented your aggregate properly,
    /// you've been recording and keeping track of your data in the contextData object provided, and now at this stage you should have
    /// all the information you need in there to figure out what to return.
    /// 
    /// Parameters passed to this function have only an affinity for a certain data type, there is no underlying schema available
    /// to force them into a certain type.  Therefore the only types you will ever see as parameters are
    /// DBNull.Value, Int64, Double, String or byte[] array.
    /// </remarks>
    /// <param name="contextData">Your own assigned contextData, provided for you so you can return your final results.</param>
    /// <returns>You may return most simple types as a return value, null or DBNull.Value to return null, DateTime, or
    /// you may return an Exception-derived class if you wish to return an error to SQLite.  Do not actually throw the error,
    /// just return it!
    /// </returns>
    public virtual object Final(object contextData)