In-memory Backend (cyclus.memback
)¶
An in-memory Python backend for Cyclus.
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class
cyclus.memback.
MemBack
¶ An in-memory Python backend database.
Note that even though the underlying C++ class is a RecBackend, the Python wrapper inherits from FullBackend and the QueryableBackend interface in implemented in Cython.
Parameters: registry : set, bool, or None, optional
The initial registry to start the backend with. Defaults is True, which stores all of the tables.
fallback : QueryableBackend-like, optional
A backend, which implements query(), that this backend can use to look up values if the table is not in the current cache.
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close
()¶ Closes the backend, flushing it in the process.
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flush
()¶ No-op since in-memory.
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name
¶ The name of the database.
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query
()¶ Queries a database table.
Parameters: table : str
The table name.
conds : iterable, optional
A list of conditions.
Returns: results : pd.DataFrame
Pandas DataFrame the represents the table. If None is returned, the table could not be found.
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registry
¶ A set of table names to store when store_all_tables is true. Setting this to True will store all tables. Setting this to None or False will clear all currently registered table names. Otherwise, Setting this to a set of strings will restrict the storage to just the specified tables. Setting the registry will also clear old cache values.
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schema
()¶
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store_all_tables
¶ Whether or not the backend will store all tables or only those in the registry.
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tables
¶ Retrieves the set of tables present in the database.
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