Public Member Functions
None	__init__ (self, Session session)

PreparedStatement	prepare (self, str query)

Protected Attributes
	_session

Detailed Description

Cache for prepared Cassandra statements

Definition at line 118 of file cassandra_utils.py.

Constructor & Destructor Documentation

◆ init()

None lsst.dax.apdb.cassandra.cassandra_utils.PreparedStatementCache.__init__	(		self,
		Session	session )

Definition at line 121 of file cassandra_utils.py.

    def __init__(self, session: Session) -> None:
        self._session = session
        self._prepared_statements: dict[str, PreparedStatement] = {}
 

Member Function Documentation

◆ prepare()

PreparedStatement lsst.dax.apdb.cassandra.cassandra_utils.PreparedStatementCache.prepare	(		self,
		str	query )

Convert query string into prepared statement.

Definition at line 125 of file cassandra_utils.py.

    def prepare(self, query: str) -> PreparedStatement:
        """Convert query string into prepared statement."""
        stmt = self._prepared_statements.get(query)
        if stmt is None:
            stmt = self._session.prepare(query)
            self._prepared_statements[query] = stmt
        return stmt
 
 

Member Data Documentation

◆ _session

lsst.dax.apdb.cassandra.cassandra_utils.PreparedStatementCache._session

protected

Definition at line 122 of file cassandra_utils.py.

The documentation for this class was generated from the following file:

/j/snowflake/release/lsstsw/stack/lsst-scipipe-8.0.0/Linux64/dax_apdb/g88963caddf+0cb8e002cc/python/lsst/dax/apdb/cassandra/cassandra_utils.py

Public Member Functions

Protected Attributes