interface rdbms-types {
  enum db-data-type {
      boolean,
      int8,
      int16,
      int32,
      int64,
      uint8,
      uint16,
      uint32,
      uint64,
      floating32,
      floating64,
      str,
      binary,
      other,
  }

  variant db-value {
      boolean(bool),
      int8(s8),
      int16(s16),
      int32(s32),
      int64(s64),
      uint8(u8),
      uint16(u16),
      uint32(u32),
      uint64(u64),
      floating32(float32),
      floating64(float64),
      str(string),
      binary(list<u8>),
      db-null,
      unsupported,
  }

  variant parameter-value {
      boolean(bool),
      int8(s8),
      int16(s16),
      int32(s32),
      int64(s64),
      uint8(u8),
      uint16(u16),
      uint32(u32),
      uint64(u64),
      floating32(float32),
      floating64(float64),
      str(string),
      binary(list<u8>),
      db-null,
  }

  record column {
      name: string,
      data-type: db-data-type,
  }

  type row = list<db-value>;

  record row-set {
      columns: list<column>,
      rows: list<row>,
  }
}