def relbind(self, db):
self.indb = db
name = self.name
target = self.target = db.get_for_update(name)
(attb, relb, amb, ambatts) = db.bindings([(name, name)])
cond = self.condition = self.condition.relbind(attb, db)
# compute domain of cond
# do nothing with it (should add sanity check)
cond_domain = cond.domain()
constraints = cond.constraints
if constraints is not None:
cassns = constraints.assns
self.eqs = constraints.eqs
else:
self.eqs = cassns = None
# compute projection/rename
from sqlsem import kjbuckets
condatts = kjbuckets.kjGraph(cond.domain().items()).neighbors(name)
translate = kjbuckets.kjDict()
for att in condatts:
translate[(name, att)] = att
self.translate = translate
invtrans = self.invtrans = ~translate
if cassns is not None:
self.rassns = invtrans * cassns
else:
self.rassns = None
return self
def relbind(self, db):
self.indb = db
name = self.name
target = self.target = db.get_for_update(name)
(attb, relb, amb, ambatts) = db.bindings( [ (name, name) ] )
cond = self.condition = self.condition.relbind(attb, db)
# compute domain of cond
# do nothing with it (should add sanity check)
cond_domain = cond.domain()
constraints = cond.constraints
if constraints is not None:
cassns = constraints.assns
self.eqs = constraints.eqs
else:
self.eqs = cassns = None
# compute projection/rename
from sqlsem import kjbuckets
condatts = kjbuckets.kjGraph(cond.domain().items()).neighbors(name)
translate = kjbuckets.kjDict()
for att in condatts:
translate[(name, att)] = att
self.translate = translate
invtrans = self.invtrans = ~translate
if cassns is not None:
self.rassns = invtrans * cassns
else:
self.rassns = None
return self
def drop_indices(self, db):
for index in self.index_list:
name = index.name
db.drop_datadef(name)
db.drop_index(name)
self.index_list = []
from sqlsem import kjbuckets
self.indices = kjbuckets.kjGraph()
def drop_indices(self, db):
for index in self.index_list:
name = index.name
db.drop_datadef(name)
db.drop_index(name)
self.index_list = []
from sqlsem import kjbuckets
self.indices = kjbuckets.kjGraph()
def relbind(self, db, atts):
"""bind self to db, ignore atts"""
name = self.name
selection = self.selection
selection = self.selection = selection.relbind(db)
namelist = self.namelist
if namelist is not None:
from sqlsem import kjbuckets
target_atts = selection.attributes()
if len(namelist)!=len(target_atts):
raise "select list and namelist don't match in %s"%name
pairs = map(None, namelist, target_atts)
self.translate = kjbuckets.kjGraph(pairs)
return self
def relbind(self, db, atts):
"""bind self to db, ignore atts"""
name = self.name
selection = self.selection
selection = self.selection = selection.relbind(db)
namelist = self.namelist
if namelist is not None:
from sqlsem import kjbuckets
target_atts = selection.attributes()
if len(namelist) != len(target_atts):
raise "select list and namelist don't match in %s" % name
pairs = map(None, namelist, target_atts)
self.translate = kjbuckets.kjGraph(pairs)
return self
def __init__(self, attribute_names, tuples=None, filter=None):
from sqlsem import kjbuckets
self.indices = kjbuckets.kjGraph()
self.index_list = []
self.attribute_names = attribute_names
if tuples is None:
tuples = []
self.filter = filter
self.set_empty()
self.add_tuples(tuples)
# indices map attname > indices containing att
# relation to shadow and log (if non-null)
self.log = None
self.name = None # anonymous by default
self.is_shadow = 0
self.touched = 0
def __init__(self, attribute_names, tuples=None, filter=None):
from sqlsem import kjbuckets
self.indices = kjbuckets.kjGraph()
self.index_list = []
self.attribute_names = attribute_names
if tuples is None:
tuples = []
self.filter = filter
self.set_empty()
self.add_tuples(tuples)
# indices map attname > indices containing att
# relation to shadow and log (if non-null)
self.log = None
self.name = None # anonymous by default
self.is_shadow = 0
self.touched = 0
