Package orm2 :: Module datatypes :: Class delayed

Class delayed

object --+            
         |            
  property --+        
             |        
      datatype --+    
                 |    
           wrapper --+
                     |
                    delayed

This is a pseudy-datatype that takes an actual datatype as argument. Values from that datatypes's column will not be SELECTed from the database regularly, but only on attribute access. This way you can treat a dbclass that contains large amount of data just like all the others and only load the data at the point in time when it's needed.

Instance Methods

[hide private]

__init__(self, inside_datatype, cache=False)

__get__(self, dbobj, owner="I don't know what this is for")
See the Python Language Reference, chapter 3.3.2.2 for details on how this works.

__select_this_column__(self)
Indicate whether this column shall be included in SELECT statements.

__select_after_insert__(self, *args)
Indicate whether this column needs to be SELECTed after the dbobj has been inserted to pick up information supplied by backend as by SQL default values and auto increment columns.

__copy__(self)

Inherited from wrapper: __eq__, __getattribute__, widget_specs

Inherited from datatype: __convert__, __delete__, __init_dbclass__, __set__, __set_from_result__, __setattr__, add_widget, check_dbobj, data_attribute_name, isset, sql_literal

Inherited from property: __new__

Inherited from object: __delattr__, __hash__, __reduce__, __reduce_ex__, __repr__, __str__

Class Variables

[hide private]

Inherited from datatype: python_class, sql_literal_class

Inherited from property: fdel, fget, fset

Properties

[hide private]

Inherited from object: __class__

Method Details

[hide private]

init(self, inside_datatype, cache=False)
(Constructor)

source code

Parameters:

inside_datatype - The datatype <b>instance</b> this wrapper is responsible for
cache - Parameter that determines whether the data is kept in memory once it is loaded from the database

Overrides: wrapper.__init__

get(self, dbobj, owner="I don't know what this is for")

source code

See the Python Language Reference, chapter 3.3.2.2 for details on how this works. Be sure to be in a relaxed, ready-for-hard-figuring mood.

Overrides: datatype.__get__: (inherited documentation)

__select_this_column__(self)

source code

Indicate whether this column shall be included in SELECT statements. True by default, it will return False for most relationships.

Overrides: datatype.__select_this_column__: (inherited documentation)

__select_after_insert__(self, *args)

source code

Indicate whether this column needs to be SELECTed after the dbobj has been inserted to pick up information supplied by backend as by SQL default values and auto increment columns.

Overrides: datatype.__select_after_insert__: (inherited documentation)

copy(self)

source code

None

Overrides: wrapper.__copy__

Class delayed

__init__(self, inside_datatype, cache=False) (Constructor)

__get__(self, dbobj, owner="I don't know what this is for")

__select_this_column__(self)

__select_after_insert__(self, *args)

__copy__(self)

init(self, inside_datatype, cache=False)
(Constructor)

get(self, dbobj, owner="I don't know what this is for")

copy(self)