def __subquery__(cls, value, timestamp):
""" Return a SQL SELECT query to use as a subquery within a
fact INSERT. Does not append parentheses or a LIMIT clause.
"""
value_type = type(value)
# We also check for subclasses for situations like basestring, which
# matches on either str or unicode.
natural_keys = [key for key in cls.__naturalkeys__
if (key.type is value_type or
issubclass(value_type, key.type))]
if not natural_keys:
raise ValueError("Value type '%s' does not match type of any "
"natural key for dimension "
"'%s'" % (value_type.__name__, cls.__name__))
sql_template = (
'SELECT {primary_key} FROM {table_name} '
'WHERE {selector} '
'AND `applicable_from` = (SELECT max(`applicable_from`) '
'FROM {table_name} '
'WHERE {selector} AND `applicable_from` <= "{timestamp}")'
)
sql = sql_template.format(
primary_key=escaped(cls.__primarykey__.name),
table_name=escaped(cls.__tablename__),
selector=" OR ".join("%s = %s" % (escaped(key.name), dump(value)) for key in natural_keys),
timestamp=timestamp
)
return sql
def insert(cls, *instances):
""" Insert one or more instances into the table as records.
"""
if instances:
columns = [
column for column in cls.__columns__
if not isinstance(column, AutoColumn)
]
sql = "%s INTO %s (\n %s\n)\n" % (
cls.INSERT, escaped(cls.__tablename__), ",\n ".join(
escaped(column.name) for column in columns))
batches = cls.batch(instances)
for iteration, batch in enumerate(batches, start=1):
log.debug('Inserting batch %s' % (iteration),
extra={"table": cls.__tablename__})
insert_statement = sql
link = "VALUES"
for instance in batch:
values = []
for column in columns:
value = instance[column.name]
values.append(dump(value))
insert_statement += link + (" (\n %s\n)" %
",\n ".join(values))
link = ","
for i in range(1, 3):
connection = Warehouse.get()
try:
cursor = connection.cursor()
cursor.execute(insert_statement)
cursor.close()
except Exception as e:
classify_error(e)
if e.__class__ == BrokenPipeError and i == 1:
log.info(
'Trying once more with a fresh connection',
extra={"table": cls.__tablename__})
connection.close()
else:
log.error(e)
return
else:
connection.commit()
break
log.debug('Finished updating %s' % cls.__tablename__,
extra={"table": cls.__tablename__})
def insert(cls, *instances):
""" Insert one or more instances into the table as records.
"""
if instances:
columns = [column for column in cls.__columns__
if not isinstance(column, AutoColumn)]
sql = "%s INTO %s (\n %s\n)\n" % (
cls.INSERT, escaped(cls.__tablename__),
",\n ".join(escaped(column.name) for column in columns))
batches = cls.batch(instances)
for iteration, batch in enumerate(batches, start=1):
log.debug('Inserting batch %s' % (iteration),
extra={"table": cls.__tablename__})
insert_statement = sql
link = "VALUES"
for instance in batch:
values = []
for column in columns:
value = instance[column.name]
values.append(dump(value))
insert_statement += link + (" (\n %s\n)" % ",\n ".join(values))
link = ","
for i in range(1, 3):
connection = Warehouse.get()
try:
cursor = connection.cursor()
cursor.execute(insert_statement)
cursor.close()
except Exception as e:
classify_error(e)
if e.__class__ == BrokenPipeError and i == 1:
log.info(
'Trying once more with a fresh connection',
extra={"table": cls.__tablename__}
)
connection.close()
else:
log.error(e)
return
else:
connection.commit()
break
log.debug('Finished updating %s' % cls.__tablename__,
extra={"table": cls.__tablename__})
def insert(cls, *instances):
""" Insert fact instances (overridden to handle Dimensions correctly)
"""
if instances:
columns = [column for column in cls.__columns__
if not isinstance(column, AutoColumn)]
sql = "%s INTO %s (\n %s\n)\n" % (
cls.INSERT, escaped(cls.__tablename__),
",\n ".join(escaped(column.name) for column in columns))
batches = cls.batch(instances)
for iteration, batch in enumerate(batches, start=1):
log.debug('Inserting batch %s' % (iteration),
extra={"table": cls.__tablename__})
insert_statement = sql
link = "VALUES"
for instance in batch:
values = []
for column in columns:
value = instance[column.name]
if isinstance(column, DimensionKey):
if not value and column.optional:
values.append(dump(value))
else:
values.append(
"(%s)" % column.dimension.__subquery__(
value,
instance.__dimension_selector__.timestamp(instance) # TODO This is a bit messy - shouldn't have to pass the instance back in.
)
)
else:
values.append(dump(value))
insert_statement += link + (" (\n %s\n)" % ",\n ".join(values))
link = ","
connection = Warehouse.get()
try:
with closing(connection.cursor()) as cursor:
cursor.execute(insert_statement)
except Exception as e:
classify_error(e)
log.error(e)
log.error(insert_statement)
connection.rollback()
else:
connection.commit()
def expression(self):
s = [escaped(self.name), self.type_expression]
if not self.optional:
s.append("NOT NULL")
default_expression = self.default_clause
if default_expression:
s.append(default_expression)
if self.comment:
s.append("COMMENT %s" % dump(self.comment))
return " ".join(s)
def expression(self):
s = [escaped(self.name), self.type_expression]
if not self.optional:
s.append("NOT NULL")
default_expression = self.default_clause
if default_expression:
s.append(default_expression)
if self.comment:
s.append("COMMENT %s" % dump(self.comment))
return " ".join(s)
def expression(self):
dimension = self.dimension
foreign_key = "FOREIGN KEY (%s) REFERENCES %s (%s)" % (
escaped(self.name), escaped(dimension.__tablename__),
escaped(dimension.__primarykey__.name))
return super(DimensionKey, self).expression + ", " + foreign_key
def __init__(self, *args, **kwargs):
self['hash_key'] = raw_sql("UNHEX(SHA1(CONCAT_WS(',', %s)))" % ', '.join(["IFNULL(%s,'NULL')" % escaped(c.name) for c in self.__compositekey__]))
def expression(self):
dimension = self.dimension
foreign_key = "FOREIGN KEY (%s) REFERENCES %s (%s)" % (
escaped(self.name), escaped(dimension.__tablename__),
escaped(dimension.__primarykey__.name))
return super(DimensionKey, self).expression + ", " + foreign_key
