encode method

@override Uint8List encode()

Implementation

@override
Uint8List encode() {
  final buffer = ByteDataWriter(endian: Endian.little);

  // command type
  buffer.writeUint8(0x17);
  // stmt id
  buffer.writeUint32(stmtID, Endian.little);
  // flags
  buffer.writeUint8(0);
  // iteration count (always 1)
  buffer.writeUint32(1, Endian.little);

  // params
  if (params.isNotEmpty) {
    // create null-bitmap
    final bitmapSize = ((params.length + 7) / 8).floor();
    final nullBitmap = Uint8List(bitmapSize);

    // write null values into null bitmap
    int paramIndex = 0;
    for (final param in params) {
      if (param == null) {
        final paramByteIndex = ((paramIndex) / 8).floor();
        final paramBitIndex = ((paramIndex) % 8);
        nullBitmap[paramByteIndex] =
            nullBitmap[paramByteIndex] | (1 << paramBitIndex);
      }
      paramIndex++;
    }

    // write null bitmap
    buffer.write(nullBitmap);

    // write new-param-bound flag
    buffer.writeUint8(1);

    // write not null values

    // write param types
    for (final param in params) {
      if (param != null) {
        buffer.writeUint8(mysqlColumnTypeVarString);
        // unsigned flag
        buffer.writeUint8(0);
      } else {
        buffer.writeUint8(mysqlColumnTypeNull);
        buffer.writeUint8(0);
      }
    }
    // write param values
    for (final param in params) {
      if (param != null) {
        final String value = param.toString();
        final encodedData = utf8.encode(value);
        buffer.writeVariableEncInt(encodedData.length);
        buffer.write(encodedData);
      }
    }
  }

  return buffer.toBytes();
}