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from airflow.contrib.hooks.snowflake_hook import SnowflakeHook
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
[docs]class SnowflakeOperator(BaseOperator):
"""
Executes sql code in a Snowflake database
:param snowflake_conn_id: reference to specific snowflake connection id
:type snowflake_conn_id: str
:param sql: the sql code to be executed. (templated)
:type sql: Can receive a str representing a sql statement,
a list of str (sql statements), or reference to a template file.
Template reference are recognized by str ending in '.sql'
:param warehouse: name of warehouse (will overwrite any warehouse
defined in the connection's extra JSON)
:type warehouse: str
:param database: name of database (will overwrite database defined
in connection)
:type database: str
:param schema: name of schema (will overwrite schema defined in
connection)
:type schema: str
:param role: name of role (will overwrite any role defined in
connection's extra JSON)
"""
[docs] template_fields = ('sql',)
[docs] template_ext = ('.sql',)
@apply_defaults
def __init__(
self, sql, snowflake_conn_id='snowflake_default', parameters=None,
autocommit=True, warehouse=None, database=None, role=None,
schema=None, *args, **kwargs):
super(SnowflakeOperator, self).__init__(*args, **kwargs)
self.snowflake_conn_id = snowflake_conn_id
self.sql = sql
self.autocommit = autocommit
self.parameters = parameters
self.warehouse = warehouse
self.database = database
self.role = role
self.schema = schema
[docs] def get_hook(self):
return SnowflakeHook(snowflake_conn_id=self.snowflake_conn_id,
warehouse=self.warehouse, database=self.database,
role=self.role, schema=self.schema)
[docs] def execute(self, context):
self.log.info('Executing: %s', self.sql)
hook = self.get_hook()
hook.run(
self.sql,
autocommit=self.autocommit,
parameters=self.parameters)