async def _execute_statement(model,
statement,
consistency_level,
timeout,
connection=None):
"""执行 cql 语句
a copy of cassandra.cqlengine.query._execute_statement
"""
params = statement.get_context()
simple_statement = SimpleStatement(str(statement),
consistency_level=consistency_level,
fetch_size=statement.fetch_size)
if model._partition_key_index:
key_values = statement.partition_key_values(model._partition_key_index)
if not any(v is None for v in key_values):
parts = model._routing_key_from_values(
key_values,
conn.get_cluster(connection).protocol_version)
simple_statement.routing_key = parts
simple_statement.keyspace = model._get_keyspace()
connection = connection or model._get_connection()
try:
return await execute(simple_statement,
params,
timeout=timeout,
connection=connection)
except Unavailable:
# 当无法用 LOCAL_QUORUM 获取数据的时候，用 ONE 来获取
simple_statement.consistency_level = ConsistencyLevel.ONE
return await execute(simple_statement,
params,
timeout=timeout,
connection=connection)
async def _execute_statement(model,
statement,
consistency_level,
timeout,
connection=None):
"""
Based on cassandra.cqlengine.query._execute_statement
"""
params = statement.get_context()
s = SimpleStatement(str(statement),
consistency_level=consistency_level,
fetch_size=statement.fetch_size)
if model._partition_key_index:
key_values = statement.partition_key_values(model._partition_key_index)
if not any(v is None for v in key_values):
parts = model._routing_key_from_values(
key_values,
conn.get_cluster(connection).protocol_version)
s.routing_key = parts
s.keyspace = model._get_keyspace()
connection = connection or model._get_connection()
return await execute(s, params, timeout=timeout, connection=connection)