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sequencial scan implementation of get_backlink_handles

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svn: r5554
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Richard Taylor 2005-12-15 12:03:24 +00:00
parent 45ccf8db1b
commit db364e3d26
2 changed files with 74 additions and 0 deletions
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5
gramps2/ChangeLog
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@ -1,3 +1,8 @@
2005-12-15 Richard Taylor <rjt-gramps@thegrindstone.me.uk>
* src/GrampsDbBase.py: in preparation for new reference_map,
added a sequencial scan implementation of get_backlink_handles
method that will work on all backends.
2005-12-14 Alex Roitman <shura@gramps-project.org> 2005-12-14 Alex Roitman <shura@gramps-project.org>
* src/GrampsBSDDB.py: Rename upgrade to avoid collision; add DB * src/GrampsBSDDB.py: Rename upgrade to avoid collision; add DB
upgrade routine; require DB to be at least version 5 (gramps upgrade routine; require DB to be at least version 5 (gramps

69
gramps2/src/GrampsDbBase.py
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@ -1446,6 +1446,75 @@ class GrampsDbBase(GrampsDBCallback.GrampsDBCallback):
default = [(1,1),(0,5),(0,6),(1,2),(1,3),(0,4),(0,7),(0,8),(0,9),(0,10)] default = [(1,1),(0,5),(0,6),(1,2),(1,3),(0,4),(0,7),(0,8),(0,9),(0,10)]
return self._get_column_order(REPOSITORY_COL_KEY,default) return self._get_column_order(REPOSITORY_COL_KEY,default)
def find_backlink_handles(self, handle, include_classes=None):
"""
Find all objects that hold a reference to the object handle.
Returns an interator over alist of (handle,class_name) tuples.
@param handle: handle of the object to search for.
@type handle: database handle
@param include_classes: list of class names to include in the results.
Default: None means include all classes.
@type include_classes: list of class names
This default implementation does a sequencial scan through all
the primary object databases and is very slow. Backends can
override this method to provide much faster implementations that
make use of additional capabilities of the backend.
Note that this is a generator function, it returns a iterator for
use in loops. If you want a list of the results use:
result_list = [i for i in find_backlink_handles(handle)]
"""
# Make a dictionary of the functions and classes that we need for
# each of the primary object tables.
primary_tables = {'Person': {'cursor_func': self.get_person_cursor,
'class_func': Person},
'Family': {'cursor_func': self.get_family_cursor,
'class_func': Family},
'Event': {'cursor_func': self.get_event_cursor,
'class_func': Event},
'Place': {'cursor_func': self.get_place_cursor,
'class_func': Place},
'Source': {'cursor_func': self.get_source_cursor,
'class_func': Source},
'MediaObject': {'cursor_func': self.get_media_cursor,
'class_func': MediaObject},
'Repository': {'cursor_func': self.get_repository_cursor,
'class_func': Repository},
}
# Now we use the functions and classes defined above to loop through each of the
# primary object tables that have been requests in the include_classes list.
for primary_table_name in primary_tables.keys():
if include_classes == None or primary_table_name in include_classes:
cursor = primary_tables[primary_table_name]['cursor_func']()
data = cursor.first()
# Grap the real object class here so that the lookup does
# not happen inside the main loop.
class_func = primary_tables[primary_table_name]['class_func']
while data:
found_handle,val = data
obj = class_func()
obj.unserialize(val)
if obj.has_source_reference(handle):
yield (found_handle,primary_table_name)
data = cursor.next()
cursor.close()
return
class Transaction: class Transaction:
""" """
Defines a group of database commits that define a single logical Defines a group of database commits that define a single logical