def is_usable(self):
        raise NotImplementedError(
            "subclasses of BaseDatabaseWrapper may require an is_usable() method")
Decode the given JSON string.
dataset/ETHPy150Open django/django/django/db/backends/base/base.py/BaseDatabaseWrapper.is_usable--crossover with--dataset/ETHPy150Open RDFLib/rdfextras/rdfextras/sparql/results/jsonlayer.py/decode