## Updates to incorporate Hdbpp-Python as our Retriever
The library in [a link](https://gitlab.com/tango-controls/hdbpp/libhdbpp-python) implements an AbstractReader and multiple Readers (i.e. what is called Retriever in our repo) following the relative hdb++ engine. Currently (March 2022), only MariaDB implementation is on the master branch, while Timescaledb is on development in [a link](https://gitlab.com/tango-controls/hdbpp/libhdbpp-python/-/tree/package_and_timescaledb_support).
The library in [libhdbpp-python](https://gitlab.com/tango-controls/hdbpp/libhdbpp-python) implements an AbstractReader and multiple Readers (i.e. what is called Retriever in our repo) following the relative hdb++ engine. Currently (March 2022), only MariaDB implementation is on the master branch, while Timescaledb is on development in [libhdbpp-python-timescaledb-branch](https://gitlab.com/tango-controls/hdbpp/libhdbpp-python/-/tree/package_and_timescaledb_support).
### Approach
The Reader relies upon hard-coded SQL scripts inside the Python methods, managed as strings.
Even our first version of the Retriever used this approach, but then we decided to overcome the hardcoded SQL scripts using the SQLAlchemy Python library, which has led to a more stable, reliable and customizable code.
### Compatibility
The libhdbpp-reader is compatible with our code and our archiver setup, as demonstrated in [a relative link](../../../jupyter-notebooks/HdbppReader_demonstrator.ipynb).
The libhdbpp-reader is compatible with our code and our archiver setup, as demonstrated in [demonstrator](../../../jupyter-notebooks/HdbppReader_demonstrator.ipynb).
### Functionalities in libhdbpp-python-reader
These are the functionalities implemented in the libhdbpp-reader:
