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Code Issues 32 Releases Wiki Activity

queryset-refactor: Changed all tree and filter "connections" to "connectors" so

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that database connections and constraint connectors look different in the code.
George Vilches pointed out this was slightly confusing previously.


git-svn-id: http://code.djangoproject.com/svn/django/branches/queryset-refactor@6866 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Malcolm Tredinnick 2007-12-03 21:10:41 +00:00
parent 4ea96c0468
commit cc0078494e
3 changed files with 39 additions and 39 deletions
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22
django/db/models/sql/query.py
View File

@ -257,13 +257,13 @@ class Query(object):
params.extend(self.extra_params)
return ' '.join(result), tuple(params)
def combine(self, rhs, connection):
def combine(self, rhs, connector):
"""
Merge the 'rhs' query into the current one (with any 'rhs' effects
being applied *after* (that is, "to the right of") anything in the
current query. 'rhs' is not modified during a call to this function.
The 'connection' parameter describes how to connect filters from the
The 'connector' parameter describes how to connect filters from the
'rhs' query.
"""
assert self.model == rhs.model, \
@ -276,7 +276,7 @@ class Query(object):
# Work out how to relabel the rhs aliases, if necessary.
change_map = {}
used = {}
conjunction = (connection == AND)
conjunction = (connector == AND)
first = True
for alias in rhs.tables:
if not rhs.alias_map[alias][ALIAS_REFCOUNT]:
@ -321,7 +321,7 @@ class Query(object):
w.add([alias, pk.column, pk, 'isnull', False], AND)
else:
w = WhereNode()
self.where.add(w, connection)
self.where.add(w, connector)
# Selection columns and extra extensions are those provided by 'rhs'.
self.select = []
@ -465,7 +465,7 @@ class Query(object):
result = []
for field in ordering:
if field == '?':
result.append(self.connection.ops.random_function_sql())
result.append(self.connector.ops.random_function_sql())
continue
if isinstance(field, int):
if field < 0:
@ -664,7 +664,7 @@ class Query(object):
self.fill_related_selections(f.rel.to._meta, alias, cur_depth + 1,
used)
def add_filter(self, filter_expr, connection=AND, negate=False):
def add_filter(self, filter_expr, connector=AND, negate=False):
"""
Add a single filter to the query.
"""
@ -694,13 +694,13 @@ class Query(object):
try:
field, target, unused, join_list, nullable = self.setup_joins(parts,
opts, alias, (connection == AND))
opts, alias, (connector == AND))
except TypeError, e:
if len(parts) != 1 or parts[0] not in self.extra_select:
raise e
# Filtering on some alias from extra(select=...)
self.where.add([None, parts[0], None, lookup_type, value],
connection)
connector)
return
col = target.column
alias = join_list[-1][-1]
@ -724,7 +724,7 @@ class Query(object):
# efficient at the database level.
self.promote_alias(join_list[-1][0])
self.where.add([alias, col, field, lookup_type, value], connection)
self.where.add([alias, col, field, lookup_type, value], connector)
if negate:
flag = False
for pos, null in enumerate(nullable):
@ -750,11 +750,11 @@ class Query(object):
for child in q_object.children:
if isinstance(child, Node):
self.where.start_subtree(q_object.connection)
self.where.start_subtree(q_object.connector)
self.add_q(child)
self.where.end_subtree()
else:
self.add_filter(child, q_object.connection, q_object.negated)
self.add_filter(child, q_object.connector, q_object.negated)
def setup_joins(self, names, opts, alias, dupe_multis):
"""

4
django/db/models/sql/where.py
View File

@ -57,14 +57,14 @@ class WhereNode(tree.Node):
sql, params = self.make_atom(child, qn)
format = '%s'
except EmptyResultSet:
if self.connection == AND and not node.negated:
if self.connector == AND and not node.negated:
# We can bail out early in this particular case (only).
raise
sql = None
if sql:
result.append(format % sql)
result_params.extend(params)
conn = ' %s ' % node.connection
conn = ' %s ' % node.connector
return conn.join(result), result_params
def make_atom(self, child, qn):

52
django/utils/tree.py
View File

@ -11,25 +11,25 @@ class Node(object):
connection (the root) with the children being either leaf nodes or other
Node instances.
"""
# Standard connection type. Clients usually won't use this at all and
# Standard connector type. Clients usually won't use this at all and
# subclasses will usually override the value.
default = 'DEFAULT'
def __init__(self, children=None, connection=None):
def __init__(self, children=None, connector=None):
self.children = children and children[:] or []
self.connection = connection or self.default
self.connector = connector or self.default
self.subtree_parents = []
self.negated = False
def __str__(self):
return '(%s: %s)' % (self.connection, ', '.join([str(c) for c in
return '(%s: %s)' % (self.connector, ', '.join([str(c) for c in
self.children]))
def __deepcopy__(self, memodict):
"""
Utility method used by copy.deepcopy().
"""
obj = self.__class__(connection=self.connection)
obj = self.__class__(connector=self.connector)
obj.children = copy.deepcopy(self.children, memodict)
obj.subtree_parents = copy.deepcopy(self.subtree_parents, memodict)
obj.negated = self.negated
@ -56,33 +56,33 @@ class Node(object):
def add(self, node, conn_type):
"""
Adds a new node to the tree. If the conn_type is the same as the root's
current connection type, the node is added to the first level.
current connector type, the node is added to the first level.
Otherwise, the whole tree is pushed down one level and a new root
connection is created, connecting the existing tree and the new node.
connector is created, connecting the existing tree and the new node.
"""
if len(self.children) < 2:
self.connection = conn_type
if self.connection == conn_type:
if isinstance(node, Node) and (node.connection == conn_type
self.connector = conn_type
if self.connector == conn_type:
if isinstance(node, Node) and (node.connector == conn_type
or len(node) == 1):
self.children.extend(node.children)
else:
self.children.append(node)
else:
obj = Node(self.children, self.connection)
self.connection = conn_type
obj = Node(self.children, self.connector)
self.connector = conn_type
self.children = [obj, node]
def negate(self):
"""
Negate the sense of the root connection.
Negate the sense of the root connector.
Interpreting the meaning of this negate is up to client code. This
method is useful for implementing "not" arrangements.
"""
self.children = [NegatedNode(self.children, self.connection,
self.children = [NegatedNode(self.children, self.connector,
old_state=self.negated)]
self.connection = self.default
self.connector = self.default
def start_subtree(self, conn_type):
"""
@ -91,13 +91,13 @@ class Node(object):
connected correctly to any existing nodes in the tree.
"""
if len(self.children) == 1:
self.connection = conn_type
elif self.connection != conn_type:
self.children = [Node(self.children, self.connection)]
self.connection = conn_type
self.connector = conn_type
elif self.connector != conn_type:
self.children = [Node(self.children, self.connector)]
self.connector = conn_type
self.subtree_parents.append(Node(self.children, self.connection))
self.connection = self.default
self.subtree_parents.append(Node(self.children, self.connector))
self.connector = self.default
self.children = []
def end_subtree(self):
@ -108,17 +108,17 @@ class Node(object):
the current instances state to be the parent.
"""
obj = self.subtree_parents.pop()
node = Node(self.children, self.connection)
self.connection = obj.connection
node = Node(self.children, self.connector)
self.connector = obj.connector
self.children = obj.children
self.children.append(node)
class NegatedNode(Node):
"""
A class that indicates the connection type should be negated (whatever that
A class that indicates the connector type should be negated (whatever that
means -- it's up to the client) when used by the client code.
"""
def __init__(self, children=None, connection=None, old_state=True):
super(NegatedNode, self).__init__(children, connection)
def __init__(self, children=None, connector=None, old_state=True):
super(NegatedNode, self).__init__(children, connector)
self.negated = not old_state