System.Data.SQLite

    /// <returns>
    /// This function throws an InvalidTypeCast() exception if the requested type doesn't match the column's definition or affinity.
    /// </returns>
    /// <param name="i">The index of the column to type-check</param>
    /// <param name="typ">The type we want to get out of the column</param>
    private void VerifyType(int i, DbType typ)
    {
      CheckClosed();
      CheckValidRow();
      SQLiteType t = GetSQLiteType(i);

      if (t.Type == typ) return;

        // Coercable type, usually a literal of some kind
      switch (_fieldTypeArray[i].Affinity)

    /// <summary>
    /// Returns the .NET type of a given column
    /// </summary>
    /// <param name="i">The index of the column to retrieve</param>
    /// <returns>Type</returns>
    public override Type GetFieldType(int i)
    {
      CheckClosed();
      return SQLiteConvert.SQLiteTypeToType(GetSQLiteType(i));
    }

    /// <summary>
    /// Returns a column as a float value
    /// </summary>
    /// <param name="i">The index of the column to retrieve</param>

    /// <summary>
    /// Retrieves the column as an object corresponding to the underlying datatype of the column
    /// </summary>
    /// <param name="i">The index of the column to retrieve</param>
    /// <returns>object</returns>
    public override object GetValue(int i)
    {
      CheckClosed();

      SQLiteType typ = GetSQLiteType(i);

      return _activeStatement._sql.GetValue(_activeStatement, i, ref typ);
    }

    /// <summary>
    /// Retreives the values of multiple columns, up to the size of the supplied array
    /// </summary>
    /// <param name="values">The array to fill with values from the columns in the current resultset</param>
    /// <returns>The number of columns retrieved</returns>
    public override int GetValues(object[] values)
    {
      CheckClosed();

      SQLiteType typ;
      int nMax = _fieldCount;
      if (values.Length < nMax) nMax = values.Length;


      for (int n = 0; n < nMax; n++)
      {
        typ = GetSQLiteType(n);
        values[n] = _activeStatement._sql.GetValue(_activeStatement, n, ref typ);
      }

      return nMax;
    }

    /// <summary>
    /// Returns True if the resultset has rows that can be fetched

    /// <summary>
    /// Retrieves the SQLiteType for a given column, and caches it to avoid repetetive interop calls.
    /// </summary>
    /// <param name="i">The index of the column to retrieve</param>
    /// <returns>A SQLiteType structure</returns>
    private SQLiteType GetSQLiteType(int i)
    {

      if (_fieldTypeArray == null) _fieldTypeArray = new SQLiteType[_fieldCount];

      if (_fieldTypeArray[i].Affinity == TypeAffinity.Uninitialized || _fieldTypeArray[i].Affinity == TypeAffinity.Null)
        _fieldTypeArray[i].Type = SQLiteConvert.TypeNameToDbType(_activeStatement._sql.ColumnType(_activeStatement, i, out _fieldTypeArray[i].Affinity));
      return _fieldTypeArray[i];
    }