def create_ad_hoc_field(cls, db_type):
import infi.clickhouse_orm.fields as orm_fields
# Enums
if db_type.startswith('Enum'):
db_type = 'String' # enum.Eum is not comparable
# Arrays
if db_type.startswith('Array'):
inner_field = cls.create_ad_hoc_field(db_type[6:-1])
return orm_fields.ArrayField(inner_field)
# FixedString
if db_type.startswith('FixedString'):
db_type = 'String'
if db_type == 'LowCardinality(String)':
db_type = 'String'
if db_type.startswith('DateTime'):
db_type = 'DateTime'
if db_type.startswith('Nullable'):
inner_field = cls.create_ad_hoc_field(db_type[9:-1])
return orm_fields.NullableField(inner_field)
# db_type for Deimal comes like 'Decimal(P, S) string where P is precision and S is scale'
if db_type.startswith('Decimal'):
nums = [int(n) for n in db_type[8:-1].split(',')]
return orm_fields.DecimalField(nums[0], nums[1])
# Simple fields
name = db_type + 'Field'
if not hasattr(orm_fields, name):
raise NotImplementedError('No field class for %s' % db_type)
return getattr(orm_fields, name)()
def create_ad_hoc_field(cls, db_type):
import infi.clickhouse_orm.fields as orm_fields
# Enums
if db_type.startswith('Enum'):
return orm_fields.BaseEnumField.create_ad_hoc_field(db_type)
# DateTime with timezone
if db_type.startswith('DateTime('):
# Some functions return DateTimeField with timezone in brackets
return orm_fields.DateTimeField()
# Arrays
if db_type.startswith('Array'):
inner_field = cls.create_ad_hoc_field(db_type[6:-1])
return orm_fields.ArrayField(inner_field)
# FixedString
if db_type.startswith('FixedString'):
length = int(db_type[12:-1])
return orm_fields.FixedStringField(length)
# Decimal
if db_type.startswith('Decimal'):
precision, scale = [
int(n.strip()) for n in db_type[8:-1].split(',')
]
return orm_fields.DecimalField(precision, scale)
# Nullable
if db_type.startswith('Nullable'):
inner_field = cls.create_ad_hoc_field(db_type[9:-1])
return orm_fields.NullableField(inner_field)
# Simple fields
name = db_type + 'Field'
if not hasattr(orm_fields, name):
raise NotImplementedError('No field class for %s' % db_type)
return getattr(orm_fields, name)()