Field storage tells how the value of schema field is stored.
This is recommended for data which is always read when the object is
AnnotationStorage creates an object attribute
OOBTree object. An
OOBTree uses buckets as the smallest
persistent entity. A bucket usually holds a small number of items. Buckets
are loaded on request and as needed compared to using native Python
It is safe to assume that you can fit few variables to one bucket.
You also might want to define
ATFieldProperty accessor if you are using
this storage. This allows you to read the object value using standard
Python attribute access notation.
Note that in this case the access goes through AT accessor and mutator functions. This differs from raw storage value access: for example the AT accessor encodes strings to UTF-8 before returning them.
VariantProductSchema['myField'].storage = atapi.AnnotationStorage() class VariantProduct(folder.ATFolder): meta_type = "VariantProduct" schema = VariantProductSchema myField = atapi.ATFieldProperty('title') product = VariantProduct() product.setMyField("foobar") # Set field using AT mutator method products.myField = # AT field property magic. This is equal to product.getMyField()
This stores field values in an external SQL database.
Store the raw values of fields on the file system.
# Usual Zope/CMF/Plone/Archetypes imports ... from iw.fss.FileSystemStorage import FileSystemStorage ... my_schema = Schema(( FileField('file', ... storage=FileSystemStorage(), widget=FileWidget(...) ), ... )) ...