System.Data.SQLite

  /// This class implements SQLiteBase completely, and is the guts of the code that interop's SQLite with .NET
  /// </summary>
  internal class SQLite3 : SQLiteBase
  {
    /// <summary>
    /// The opaque pointer returned to us by the sqlite provider
    /// </summary>
    protected IntPtr              _sql;
    /// <summary>
    /// The user-defined functions registered on this connection
    /// </summary>
    protected SQLiteFunction[] _functionsArray;

    internal SQLite3(SQLiteDateFormats fmt)
      : base(fmt)
    {
    }

    protected override void Dispose(bool bDisposing)
    {
      Close();
    }

    internal override void Close()
    {
      if (_sql != IntPtr.Zero)
      {
        int n = UnsafeNativeMethods.sqlite3_close_interop(_sql);
        if (n > 0) throw new SQLiteException(n, SQLiteLastError());
        SQLiteFunction.UnbindFunctions(this, _functionsArray);
      }
      _sql = IntPtr.Zero;
    }

    internal override void Cancel()
    {
      UnsafeNativeMethods.sqlite3_interrupt_interop(_sql);
    }

      {
        return UnsafeNativeMethods.sqlite3_changes_interop(_sql);
      }
    }

    internal override void Open(string strFilename)
    {
      if (_sql != IntPtr.Zero) return;
      int n = UnsafeNativeMethods.sqlite3_open_interop(ToUTF8(strFilename), out _sql);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());

      _functionsArray = SQLiteFunction.BindFunctions(this);
    }

    internal override void SetTimeout(int nTimeoutMS)
    {
      int n = UnsafeNativeMethods.sqlite3_busy_timeout_interop(_sql, nTimeoutMS);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());
    }

    internal override void Execute(string strSql)
    {
      IntPtr p;
      string str = strSql;
      int len;

      int n = UnsafeNativeMethods.sqlite3_exec_interop(_sql, ToUTF8(strSql), IntPtr.Zero, IntPtr.Zero, out p, out len);
      if (p != IntPtr.Zero)
      {
        str = base.ToString(p, len);
        UnsafeNativeMethods.sqlite3_free_interop(p);
      }
      if (n > 0) throw new SQLiteException(n, str);
    }

        }
      }
    }

    internal override void FinalizeStatement(SQLiteStatement stmt)
    {
      if (stmt._sqlite_stmt != IntPtr.Zero)
      {
        int n = UnsafeNativeMethods.sqlite3_finalize_interop(stmt._sqlite_stmt);
        if (n > 0) throw new SQLiteException(n, SQLiteLastError());
      }
      stmt._sqlite_stmt = IntPtr.Zero;
    }

    internal override int Reset(SQLiteStatement stmt)
    {
      int n;

      n = UnsafeNativeMethods.sqlite3_reset_interop(stmt._sqlite_stmt);

      // If the schema changed, try and re-prepare it
      if (n == 17) // SQLITE_SCHEMA
      {
        // Recreate a dummy statement
        string str;
        using (SQLiteStatement tmp = Prepare(stmt._sqlStatement, null, out str))
        {
          // Finalize the existing statement
          FinalizeStatement(stmt);

          // Reassign a new statement pointer to the old statement and clear the temporary one
          stmt._sqlite_stmt = tmp._sqlite_stmt;
          tmp._sqlite_stmt = IntPtr.Zero;

          // Reapply parameters
          stmt.BindParameters();
        }
        return -1; // Reset was OK, with schema change
      }
      else if (n == 6) // SQLITE_LOCKED

    {
      int len;
      return ToString(UnsafeNativeMethods.sqlite3_errmsg_interop(_sql, out len), len);
    }

    internal override SQLiteStatement Prepare(string strSql, SQLiteStatement previous, out string strRemain)
    {
      IntPtr stmt;
      IntPtr ptr;
      int len;

      byte[] b = ToUTF8(strSql);

      int n = UnsafeNativeMethods.sqlite3_prepare_interop(_sql, b, b.Length - 1, out stmt, out ptr, out len);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());

      strRemain = ToString(ptr, len);

      SQLiteStatement cmd = null;
      if (stmt != IntPtr.Zero) cmd = new SQLiteStatement(this, stmt, strSql.Substring(0, strSql.Length - strRemain.Length), previous);

      return cmd;
    }

    internal override void Bind_Double(SQLiteStatement stmt, int index, double value)
    {
      int n = UnsafeNativeMethods.sqlite3_bind_double_interop(stmt._sqlite_stmt, index, ref value);

      int n = UnsafeNativeMethods.sqlite3_bind_int64_interop(stmt._sqlite_stmt, index, ref value);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());
    }

    internal override void Bind_Text(SQLiteStatement stmt, int index, string value)
    {
      byte[] b = ToUTF8(value);
      int n = UnsafeNativeMethods.sqlite3_bind_text_interop(stmt._sqlite_stmt, index, b, b.Length - 1, (IntPtr)(-1));
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());
    }

    internal override void Bind_DateTime(SQLiteStatement stmt, int index, DateTime dt)
    {
      byte[] b = ToUTF8(dt);
      int n = UnsafeNativeMethods.sqlite3_bind_text_interop(stmt._sqlite_stmt, index, b, b.Length - 1, (IntPtr)(-1));
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());
    }

    internal override void Bind_Blob(SQLiteStatement stmt, int index, byte[] blobData)
    {
      int n = UnsafeNativeMethods.sqlite3_bind_blob_interop(stmt._sqlite_stmt, index, blobData, blobData.Length, (IntPtr)(-1));
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());
    }

    internal override void Bind_Null(SQLiteStatement stmt, int index)
    {
      int n = UnsafeNativeMethods.sqlite3_bind_null_interop(stmt._sqlite_stmt, index);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());

    }

    internal override bool IsNull(SQLiteStatement stmt, int index)
    {
      return (UnsafeNativeMethods.sqlite3_column_type_interop(stmt._sqlite_stmt, index) == TypeAffinity.Null);
    }

    internal override int AggregateCount(IntPtr context)
    {
      return UnsafeNativeMethods.sqlite3_aggregate_count_interop(context);
    }

    internal override IntPtr CreateFunction(string strFunction, int nArgs, SQLiteCallback func, SQLiteCallback funcstep, SQLiteCallback funcfinal)
    {
      IntPtr nCookie;

      int n = UnsafeNativeMethods.sqlite3_create_function_interop(_sql, ToUTF8(strFunction), nArgs, 1, func, funcstep, funcfinal, out nCookie);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());

      return nCookie;
    }

    internal override IntPtr CreateCollation(string strCollation, SQLiteCollation func)
    {
      IntPtr nCookie;

      int n = UnsafeNativeMethods.sqlite3_create_collation_interop(_sql, ToUTF8(strCollation), 1, 0, func, out nCookie);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());

      return nCookie;
    }

    internal override void FreeFunction(IntPtr nCookie)
    {
      UnsafeNativeMethods.sqlite3_function_free_callbackcookie(nCookie);
    }

    internal override long GetParamValueBytes(IntPtr p, int nDataOffset, byte[] bDest, int nStart, int nLength)
    {
      IntPtr ptr;
      int nlen;
      int nCopied = nLength;

      nlen = UnsafeNativeMethods.sqlite3_value_bytes_interop(p);
      ptr = UnsafeNativeMethods.sqlite3_value_blob_interop(p);

      if (bDest == null) return nlen;

      if (nCopied + nStart > bDest.Length) nCopied = bDest.Length - nStart;
      if (nCopied + nDataOffset > nlen) nCopied = nlen - nDataOffset;

      if (nCopied > 0)
        Marshal.Copy((IntPtr)(ptr.ToInt32() + nDataOffset), bDest, nStart, nCopied);
      else nCopied = 0;

      return nCopied;
    }

    internal override double GetParamValueDouble(IntPtr ptr)
    {
      double value;
      UnsafeNativeMethods.sqlite3_value_double_interop(ptr, out value);
      return value;
    }

    internal override int GetParamValueInt32(IntPtr ptr)
    {
      return UnsafeNativeMethods.sqlite3_value_int_interop(ptr);
    }

    internal override long GetParamValueInt64(IntPtr ptr)
    {
      Int64 value;
      UnsafeNativeMethods.sqlite3_value_int64_interop(ptr, out value);
      return value;
    }

    internal override string GetParamValueText(IntPtr ptr)
    {
      int len;
      return ToString(UnsafeNativeMethods.sqlite3_value_text_interop(ptr, out len), len);
    }

    internal override TypeAffinity GetParamValueType(IntPtr ptr)
    {
      return UnsafeNativeMethods.sqlite3_value_type_interop(ptr);
    }

    internal override void ReturnBlob(IntPtr context, byte[] value)
    {
      UnsafeNativeMethods.sqlite3_result_blob_interop(context, value, value.Length, (IntPtr)(-1));
    }

    internal override void ReturnDouble(IntPtr context, double value)
    {
      UnsafeNativeMethods.sqlite3_result_double_interop(context, ref value);
    }

    internal override void ReturnError(IntPtr context, string value)
    {
      UnsafeNativeMethods.sqlite3_result_error_interop(context, ToUTF8(value), value.Length);
    }

    internal override void ReturnInt32(IntPtr context, int value)
    {
      UnsafeNativeMethods.sqlite3_result_int_interop(context, value);
    }

    internal override void ReturnInt64(IntPtr context, long value)
    {
      UnsafeNativeMethods.sqlite3_result_int64_interop(context, ref value);
    }

    internal override void ReturnNull(IntPtr context)
    {
      UnsafeNativeMethods.sqlite3_result_null_interop(context);
    }

    internal override void ReturnText(IntPtr context, string value)
    {
      UnsafeNativeMethods.sqlite3_result_text_interop(context, ToUTF8(value), value.Length, (IntPtr)(-1));
    }

    internal override IntPtr AggregateContext(IntPtr context)
    {
      return UnsafeNativeMethods.sqlite3_aggregate_context_interop(context, 1);
    }

    //internal override void SetRealColNames(bool bOn)
    //{
    //  UnsafeNativeMethods.sqlite3_realcolnames(_sql, Convert.ToInt32(bOn));

        int len;
        return base.ToString(UnsafeNativeMethods.sqlite3_libversion_interop(out len), len);
      }
    }

    internal override void Open(string strFilename)
    {
      if (_sql != IntPtr.Zero) return;
      int n = UnsafeNativeMethods.sqlite3_open16_interop(strFilename, out _sql);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());

      _functionsArray = SQLiteFunction.BindFunctions(this);
    }

    internal override string SQLiteLastError()
    {
      int len;
      return ToString(UnsafeNativeMethods.sqlite3_errmsg16_interop(_sql, out len), len);
    }

    internal override SQLiteStatement Prepare(string strSql, SQLiteStatement previous, out string strRemain)
    {
      IntPtr stmt;
      IntPtr ptr;
      int len;

      int n = UnsafeNativeMethods.sqlite3_prepare16_interop(_sql, strSql, strSql.Length, out stmt, out ptr, out len);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());

      strRemain = ToString(ptr, len);

    internal override string ColumnTableName(SQLiteStatement stmt, int index)
    {
      int len;
      return ToString(UnsafeNativeMethods.sqlite3_column_table_name16_interop(stmt._sqlite_stmt, index, out len), len);
    }

    internal override IntPtr CreateFunction(string strFunction, int nArgs, SQLiteCallback func, SQLiteCallback funcstep, SQLiteCallback funcfinal)
    {
      IntPtr nCookie;

      int n = UnsafeNativeMethods.sqlite3_create_function16_interop(_sql, strFunction, nArgs, 4, func, funcstep, funcfinal, out nCookie);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());

      return nCookie;
    }

    internal override IntPtr CreateCollation(string strCollation, SQLiteCollation func)
    {
      IntPtr nCookie;

      int n = UnsafeNativeMethods.sqlite3_create_collation16_interop(_sql, strCollation, 4, 0, func, out nCookie);
      if (n > 0) throw new SQLiteException(n, SQLiteLastError());

      return nCookie;
    }

    internal override string GetParamValueText(IntPtr ptr)
    {
      int len;
      return ToString(UnsafeNativeMethods.sqlite3_value_text16_interop(ptr, out len), len);
    }

    internal override void ReturnError(IntPtr context, string value)
    {
      UnsafeNativeMethods.sqlite3_result_error16_interop(context, value, value.Length);
    }

    internal override void ReturnText(IntPtr context, string value)
    {
      UnsafeNativeMethods.sqlite3_result_text16_interop(context, value, value.Length, (IntPtr)(-1));
    }
  }
}

          if (typ.Type == DbType.Guid)
            return new Guid(GetText(stmt, index));

          return GetText(stmt, index);
      }
    }

    internal abstract IntPtr  CreateCollation(string strCollation, SQLiteCollation func);
    internal abstract IntPtr  CreateFunction(string strFunction, int nArgs, SQLiteCallback func, SQLiteCallback funcstep, SQLiteCallback funcfinal);
    internal abstract void FreeFunction(IntPtr cookie);

    internal abstract int AggregateCount(IntPtr context);
    internal abstract IntPtr AggregateContext(IntPtr context);

    internal abstract long   GetParamValueBytes(IntPtr ptr, int nDataOffset, byte[] bDest, int nStart, int nLength);
    internal abstract double GetParamValueDouble(IntPtr ptr);
    internal abstract int    GetParamValueInt32(IntPtr ptr);
    internal abstract Int64  GetParamValueInt64(IntPtr ptr);
    internal abstract string GetParamValueText(IntPtr ptr);
    internal abstract TypeAffinity GetParamValueType(IntPtr ptr);

    internal abstract void ReturnBlob(IntPtr context, byte[] value);
    internal abstract void ReturnDouble(IntPtr context, double value);
    internal abstract void ReturnError(IntPtr context, string value);
    internal abstract void ReturnInt32(IntPtr context, Int32 value);
    internal abstract void ReturnInt64(IntPtr context, Int64 value);
    internal abstract void ReturnNull(IntPtr context);
    internal abstract void ReturnText(IntPtr context, string value);

    internal abstract void SetPassword(byte[] passwordBytes);
    internal abstract void ChangePassword(byte[] newPasswordBytes);

    protected virtual void Dispose(bool bDisposing)
    {
    }

      DbType.Single,
      DbType.Double,
      DbType.Decimal,
      DbType.DateTime,
      DbType.Object,
      DbType.String,
    };

    /// <summary>
    /// Returns the ColumnSize for the given DbType
    /// </summary>
    /// <param name="typ">The DbType to get the size of</param>
    /// <returns></returns>
    internal static int DbTypeToColumnSize(DbType typ)
    {
      return _dbtypetocolumnsize[(int)typ];
    }

    private static int[] _dbtypetocolumnsize = {
      2147483647,   // 0
      2147483647,   // 1
      1,     // 2
      1,     // 3
      8,  // 4
      8, // 5
      8, // 6
      8,  // 7
      8,   // 8
      16,     // 9
      2,
      4,
      8,
      2147483647,
      1,
      4,
      2147483647,
      8,
      2,
      4,
      8,
      8,
      2147483647,
      2147483647,
      2147483647,
      2147483647,   // 25 (Xml)
    };

    /// <summary>
    /// Convert a DbType to a Type
    /// </summary>
    /// <param name="typ">The DbType to convert from</param>
    /// <returns>The closest-match .NET type</returns>
    internal static Type DbTypeToType(DbType typ)

      for (int n = 0; n < _fieldCount; n++)
      {
        row = tbl.NewRow();

        // Default settings for the column
        row[SchemaTableColumn.ColumnName] = GetName(n);
        row[SchemaTableColumn.ColumnOrdinal] = n;
        row[SchemaTableColumn.ColumnSize] = SQLiteConvert.DbTypeToColumnSize(GetSQLiteType(n).Type);
        row[SchemaTableColumn.NumericPrecision] = 255;
        row[SchemaTableColumn.NumericScale] = 0;
        row[SchemaTableColumn.ProviderType] = GetSQLiteType(n).Type;
        row[SchemaTableColumn.IsLong] = (GetSQLiteType(n).Type == DbType.Binary);
        row[SchemaTableColumn.AllowDBNull] = true;
        row[SchemaTableOptionalColumn.IsReadOnly] = false;
        row[SchemaTableOptionalColumn.IsRowVersion] = false;
        row[SchemaTableColumn.IsUnique] = false;

  /// <summary>
  /// An internal callback delegate declaration.
  /// </summary>
  /// <param name="context">Raw context pointer for the user function</param>
  /// <param name="nArgs">Count of arguments to the function</param>
  /// <param name="argsptr">A pointer to the array of argument pointers</param>
  internal delegate void SQLiteCallback(IntPtr context, int nArgs, IntPtr argsptr);
  /// <summary>
  /// Internal callback delegate for implementing collation sequences
  /// </summary>
  /// <param name="len1">Length of the string pv1</param>
  /// <param name="pv1">Pointer to the first string to compare</param>
  /// <param name="len2">Length of the string pv2</param>
  /// <param name="pv2">Pointer to the second string to compare</param>

    /// <summary>
    /// The base connection this function is attached to
    /// </summary>
    private SQLiteBase              _base;
    /// <summary>
    /// Used internally to keep track of memory allocated for aggregate functions
    /// </summary>
    private IntPtr                     _interopCookie;
    /// <summary>
    /// Internal array used to keep track of aggregate function context data
    /// </summary>
    private Hashtable _contextDataList;

    /// <summary>
    /// Holds a reference to the callback function for user functions
    /// </summary>
    private SQLiteCallback  _InvokeFunc;
    /// <summary>
    /// Holds a reference to the callbakc function for stepping in an aggregate function

    private static List<SQLiteFunctionAttribute> _registeredFunctions = new List<SQLiteFunctionAttribute>();

    /// <summary>
    /// Internal constructor, initializes the function's internal variables.
    /// </summary>
    protected SQLiteFunction()
    {
      _contextDataList = new Hashtable();
    }

    /// <summary>
    /// Returns a reference to the underlying connection's SQLiteConvert class, which can be used to convert
    /// strings and DateTime's into the current connection's encoding schema.
    /// </summary>
    public SQLiteConvert SQLiteConvert

    /// </remarks>
    /// <param name="nArgs">The number of arguments</param>
    /// <param name="argsptr">A pointer to the array of arguments</param>
    /// <returns>An object array of the arguments once they've been converted to .NET values</returns>
    internal object[] ConvertParams(int nArgs, IntPtr argsptr)
    {
      object[] parms = new object[nArgs];
      IntPtr[] argint = new IntPtr[nArgs];
      //string s;
      //DateTime dt;

      Marshal.Copy(argsptr, argint, 0, nArgs);

      for (int n = 0; n < nArgs; n++)
      {

    }

    /// <summary>
    /// Takes the return value from Invoke() and Final() and figures out how to return it to SQLite's context.
    /// </summary>
    /// <param name="context">The context the return value applies to</param>
    /// <param name="returnValue">The parameter to return to SQLite</param>
    void SetReturnValue(IntPtr context, object returnValue)
    {
      if (returnValue == null || returnValue == DBNull.Value)
      {
        _base.ReturnNull(context);
        return;
      }

    /// <summary>
    /// Internal scalar callback function, which wraps the raw context pointer and calls the virtual Invoke() method.
    /// </summary>
    /// <param name="context">A raw context pointer</param>
    /// <param name="nArgs">Number of arguments passed in</param>
    /// <param name="argsptr">A pointer to the array of arguments</param>
    internal void ScalarCallback(IntPtr context, int nArgs, IntPtr argsptr)
    {
      SetReturnValue(context, Invoke(ConvertParams(nArgs, argsptr)));
    }

    /// <summary>
    /// Internal collation sequence function, which wraps up the raw string pointers and executes the Compare() virtual function.
    /// </summary>

    /// This function takes care of doing the lookups and getting the important information put together to call the Step() function.
    /// That includes pulling out the user's contextData and updating it after the call is made.  We use a sorted list for this so
    /// binary searches can be done to find the data.
    /// </remarks>
    /// <param name="context">A raw context pointer</param>
    /// <param name="nArgs">Number of arguments passed in</param>
    /// <param name="argsptr">A pointer to the array of arguments</param>
    internal void StepCallback(IntPtr context, int nArgs, IntPtr argsptr)
    {
      int n = _base.AggregateCount(context);
      IntPtr nAux;
      object obj = null;

      nAux = _base.AggregateContext(context);
      if (n > 1) obj = _contextDataList[nAux];

      Step(ConvertParams(nArgs, argsptr), n, ref obj);
      _contextDataList[nAux] = obj;      
    }

    /// <summary>
    /// An internal aggregate Final function callback, which wraps the context pointer and calls the virtual Final() method.
    /// </summary>
    /// <param name="context">A raw context pointer</param>
    /// <param name="nArgs">Not used, always zero</param>
    /// <param name="argsptr">Not used, always zero</param>
    internal void FinalCallback(IntPtr context, int nArgs, IntPtr argsptr)
    {
      IntPtr n = _base.AggregateContext(context);
      object obj = null;

      if (_contextDataList.ContainsKey(n))
      {
        obj = _contextDataList[n];
        _contextDataList.Remove(n);
      }

    /// </summary>
    public void Dispose()
    {
      Dispose(true);

      IDisposable disp;

      foreach (KeyValuePair<IntPtr, object> kv in _contextDataList)
      {
        disp = kv.Value as IDisposable;
        if (disp != null)
          disp.Dispose();
      }
      _contextDataList.Clear();

      {
      }
    }

    /// <summary>
    /// Returns the datatype of the parameter
    /// </summary>
#if !PLATFORM_COMPACTFRAMEWORK
    [DbProviderSpecificTypeProperty(true)]
#endif
    public override DbType DbType
    {
      get
      {
        if (_dbType == -1) return DbType.String; // Unassigned default value is String
        return (DbType)_dbType;
      }

    /// <summary>
    /// The command text of this SQL statement
    /// </summary>
    internal string            _sqlStatement;
    /// <summary>
    /// The actual statement pointer
    /// </summary>
    internal IntPtr            _sqlite_stmt;
    /// <summary>
    /// An index from which unnamed parameters begin
    /// </summary>
    internal int               _unnamedParameters;
    /// <summary>
    /// Names of the parameters as SQLite understands them to be
    /// </summary>

    /// <summary>
    /// Initializes the statement and attempts to get all information about parameters in the statement
    /// </summary>
    /// <param name="sqlbase">The base SQLite object</param>
    /// <param name="stmt">The statement</param>
    /// <param name="strCommand">The command text for this statement</param>
    /// <param name="previous">The previous command in a multi-statement command</param>
    internal SQLiteStatement(SQLiteBase sqlbase, IntPtr stmt, string strCommand, SQLiteStatement previous)
    {
      _sql     = sqlbase;
      _sqlite_stmt = stmt;
      _sqlStatement  = strCommand;

      // Determine parameters for this statement (if any) and prepare space for them.
      int nCmdStart = 0;

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_libversion_interop(out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_free_interop(IntPtr p);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_open_interop(byte[] utf8Filename, out IntPtr db);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_interrupt_interop(IntPtr db);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_close_interop(IntPtr db);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_exec_interop(IntPtr db, byte[] strSql, IntPtr pvCallback, IntPtr pvParam, out IntPtr errMsg, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_errmsg_interop(IntPtr db, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_changes_interop(IntPtr db);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_busy_timeout_interop(IntPtr db, int ms);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_prepare_interop(IntPtr db, byte[] strSql, int nBytes, out IntPtr stmt, out IntPtr ptrRemain, out int nRemain);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_bind_blob_interop(IntPtr stmt, int index, Byte[] value, int nSize, IntPtr nTransient);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_bind_double_interop(IntPtr stmt, int index, ref double value);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_bind_int_interop(IntPtr stmt, int index, int value);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_bind_int64_interop(IntPtr stmt, int index, ref long value);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_bind_null_interop(IntPtr stmt, int index);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_bind_text_interop(IntPtr stmt, int index, byte[] value, int nlen, IntPtr pvReserved);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_bind_parameter_count_interop(IntPtr stmt);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_bind_parameter_name_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_bind_parameter_index_interop(IntPtr stmt, byte[] strName);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_column_count_interop(IntPtr stmt);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_name_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_decltype_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_step_interop(IntPtr stmt);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_column_double_interop(IntPtr stmt, int index, out double value);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_column_int_interop(IntPtr stmt, int index);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_column_int64_interop(IntPtr stmt, int index, out long value);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_text_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_blob_interop(IntPtr stmt, int index);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_column_bytes_interop(IntPtr stmt, int index);

    [DllImport(SQLITE_DLL)]
    internal static extern TypeAffinity sqlite3_column_type_interop(IntPtr stmt, int index);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_finalize_interop(IntPtr stmt);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_reset_interop(IntPtr stmt);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_create_collation_interop(IntPtr db, byte[] strName, int nType, int nArgs, SQLiteCollation func, out IntPtr nCookie);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_create_function_interop(IntPtr db, byte[] strName, int nArgs, int nType, SQLiteCallback func, SQLiteCallback fstep, SQLiteCallback ffinal, out IntPtr nCookie);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_function_free_callbackcookie(IntPtr nCookie);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_aggregate_count_interop(IntPtr context);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_value_blob_interop(IntPtr p);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_value_bytes_interop(IntPtr p);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_value_double_interop(IntPtr p, out double value);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_value_int_interop(IntPtr p);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_value_int64_interop(IntPtr p, out Int64 value);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_value_text_interop(IntPtr p, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern TypeAffinity sqlite3_value_type_interop(IntPtr p);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_result_blob_interop(IntPtr context, byte[] value, int nSize, IntPtr pvReserved);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_result_double_interop(IntPtr context, ref double value);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_result_error_interop(IntPtr context, byte[] strErr, int nLen);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_result_int_interop(IntPtr context, int value);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_result_int64_interop(IntPtr context, ref Int64 value);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_result_null_interop(IntPtr context);

    [DllImport(SQLITE_DLL)]
    internal static extern void sqlite3_result_text_interop(IntPtr context, byte[] value, int nLen, IntPtr pvReserved);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_aggregate_context_interop(IntPtr context, int nBytes);

    [DllImport(SQLITE_DLL)]



    internal static extern int sqlite3_table_column_metadata_interop(IntPtr db, byte[] dbName, byte[] tblName, byte[] colName, out IntPtr ptrDataType, out IntPtr ptrCollSeq, out int notNull, out int primaryKey, out int autoInc, out int dtLen, out int csLen);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_database_name_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_database_name16_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_table_name_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_table_name16_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_origin_name_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_origin_name16_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_text16_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode)]
    internal static extern int sqlite3_open16_interop(string utf16Filename, out IntPtr db);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_errmsg16_interop(IntPtr db, out int len);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode)]
    internal static extern int sqlite3_prepare16_interop(IntPtr db, string strSql, int sqlLen, out IntPtr stmt, out IntPtr ptrRemain, out int len);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode)]
    internal static extern int sqlite3_bind_text16_interop(IntPtr stmt, int index, string value, int nlen, int nTransient);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_name16_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_column_decltype16_interop(IntPtr stmt, int index, out int len);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode)]
    internal static extern int sqlite3_create_collation16_interop(IntPtr db, string strName, int nType, int nArgs, SQLiteCollation func, out IntPtr nCookie);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode)]
    internal static extern int sqlite3_create_function16_interop(IntPtr db, string strName, int nArgs, int nType, SQLiteCallback func, SQLiteCallback funcstep, SQLiteCallback funcfinal, out IntPtr nCookie);

    [DllImport(SQLITE_DLL)]
    internal static extern IntPtr sqlite3_value_text16_interop(IntPtr p, out int len);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode)]
    internal static extern void sqlite3_result_error16_interop(IntPtr context, string strName, int nLen);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode)]
    internal static extern void sqlite3_result_text16_interop(IntPtr context, string strName, int nLen, IntPtr pvReserved);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode, SetLastError = true)]
    internal static extern int sqlite3_encryptfile(string fileName);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode, SetLastError = true)]
    internal static extern int sqlite3_decryptfile(string fileName);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode, SetLastError = true)]
    internal static extern int sqlite3_encryptedstatus(string fileName, out int fileStatus);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode, SetLastError = true)]
    internal static extern int sqlite3_compressfile(string fileName);

    [DllImport(SQLITE_DLL, CharSet = CharSet.Unicode, SetLastError = true)]
    internal static extern int sqlite3_decompressfile(string fileName);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_key_interop(IntPtr db, byte[] key, int keylen);

    [DllImport(SQLITE_DLL)]
    internal static extern int sqlite3_rekey_interop(IntPtr db, byte[] key, int keylen);
  }
}