Column

class lsst.dax.apdb.schema_model.Column(name: str, id: str, datatype: ~felis.datamodel.DataType | ~lsst.dax.apdb.schema_model.ExtraDataTypes, length: int | None = None, nullable: bool = True, value: ~typing.Any = None, autoincrement: bool | None = None, description: str | None = None, annotations: ~collections.abc.Mapping[str, ~typing.Any] = <factory>, table: ~lsst.dax.apdb.schema_model.Table | None = None)

Bases: object

Column representation in schema.

Attributes Summary

autoincrement	Unspecified value results in None.
description	Column description.
length	Optional length for string/binary columns
nullable	True for nullable columns.
table	Table which defines this column, usually not None.
value	Default value for column, can be None.

Methods Summary

clone()	Make a clone of self.
from_felis(dm_column)	Convert Felis column definition into instance of this class.
size()	Return size in bytes of this column.

Attributes Documentation

autoincrement: bool | None = None

Unspecified value results in None.

description: str | None = None

Column description.

length: int | None = None

Optional length for string/binary columns

nullable: bool = True

True for nullable columns.

table: Table | None = None

Table which defines this column, usually not None.

value: Any = None

Default value for column, can be None.

Methods Documentation

clone() → Column

Make a clone of self.

classmethod from_felis(dm_column: Column) → Column

Convert Felis column definition into instance of this class.

Parameters:

dm_columnfelis.datamodel.Column

Felis column definition.

Returns:

columnColumn

Converted column definition.

size() → int

Return size in bytes of this column.

Returns:

sizeint

Size in bytes for this column, typically represents in-memory size of the corresponding data type. May or may not be the same as storage size or wire-level protocol size.