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``cassandra.cqlengine.columns`` - Column types for object mapping models
========================================================================
.. module:: cassandra.cqlengine.columns
Columns
-------
Columns in your models map to columns in your CQL table. You define CQL columns by defining column attributes on your model classes.
For a model to be valid it needs at least one primary key column and one non-primary key column.
Just as in CQL, the order you define your columns in is important, and is the same order they are defined in on a model's corresponding table.
Each column on your model definitions needs to be an instance of a Column class.
.. autoclass:: Column(**kwargs)
.. autoattribute:: primary_key
.. autoattribute:: partition_key
.. autoattribute:: index
.. autoattribute:: custom_index
.. autoattribute:: db_field
.. autoattribute:: default
.. autoattribute:: required
.. autoattribute:: clustering_order
.. autoattribute:: discriminator_column
.. autoattribute:: static
Column Types
------------
Columns of all types are initialized by passing :class:`.Column` attributes to the constructor by keyword.
.. autoclass:: Ascii(**kwargs)
.. autoclass:: BigInt(**kwargs)
.. autoclass:: Blob(**kwargs)
.. autoclass:: Bytes(**kwargs)
.. autoclass:: Boolean(**kwargs)
.. autoclass:: Counter
.. autoclass:: Date(**kwargs)
.. autoclass:: DateTime(**kwargs)
.. autoattribute:: truncate_microseconds
.. autoclass:: Decimal(**kwargs)
.. autoclass:: Double(**kwargs)
.. autoclass:: Float
.. autoclass:: Integer(**kwargs)
.. autoclass:: List
.. autoclass:: Map
.. autoclass:: Set
.. autoclass:: SmallInt(**kwargs)
.. autoclass:: Text
.. autoclass:: Time(**kwargs)
.. autoclass:: TimeUUID(**kwargs)
.. autoclass:: TinyInt(**kwargs)
.. autoclass:: UserDefinedType
.. autoclass:: UUID(**kwargs)
.. autoclass:: VarInt(**kwargs)
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