def labels(self):
""" The full set of labels to apply to the merged node.
:rtype: :class:`py2neo.LabelSet`
"""
l = LabelSet(self.__labels)
l.update(self.__node.labels)
return l
def labels(self):
""" The full set of labels to apply to the merged node.
:rtype: :class:`py2neo.LabelSet`
"""
l = LabelSet(self.__labels)
l.update(self.__node.labels)
return l
def __init__(self, primary_label, primary_key=None, primary_value=None):
CypherTask.__init__(self)
self.__node = Node(primary_label)
if primary_key is not None:
self.__node.properties[primary_key] = CypherParameter("V", primary_value)
self.__labels = LabelSet()
self.__properties = PropertySet()
self.__return = False
class MergeNode(CypherTask):
""" :class:`.CypherTask` for `merging <http://neo4j.com/docs/stable/query-merge.html>`_
nodes.
::
>>> from py2neo import Graph
>>> graph = Graph()
>>> tx = graph.cypher.begin()
>>> tx.append(MergeNode("Person", "name", "Alice"))
>>> tx.commit()
| a
---+-----------------------
1 | (n170 {name:"Alice"})
"""
def __init__(self, primary_label, primary_key=None, primary_value=None):
CypherTask.__init__(self)
self.__node = Node(primary_label)
if primary_key is not None:
self.__node.properties[primary_key] = CypherParameter(
"V", primary_value)
self.__labels = LabelSet()
self.__properties = PropertySet()
self.__return = False
@property
def labels(self):
""" The full set of labels to apply to the merged node.
:rtype: :class:`py2neo.LabelSet`
"""
l = LabelSet(self.__labels)
l.update(self.__node.labels)
return l
@property
def properties(self):
""" The full set of properties to apply to the merged node.
:rtype: :class:`py2neo.PropertySet`
"""
p = PropertySet(self.__properties)
if self.primary_key:
p[self.primary_key] = self.primary_value
return p
@property
def primary_label(self):
""" The label on which to merge.
"""
return list(self.__node.labels)[0]
@property
def primary_key(self):
""" The property key on which to merge.
"""
try:
return list(self.__node.properties.keys())[0]
except IndexError:
return None
@property
def primary_value(self):
""" The property value on which to merge.
"""
try:
return list(self.__node.properties.values())[0].value
except IndexError:
return None
def set(self, *labels, **properties):
""" Extra labels and properties to apply to the node.
>>> merge = MergeNode("Person", "name", "Bob").set("Employee", employee_id=1234)
"""
self.__labels.update(labels)
self.__properties.update(properties)
return self
def with_return(self):
""" Include a RETURN clause in the statement.
"""
self.__return = True
return self
@property
def statement(self):
""" The full Cypher statement.
"""
string = StringIO()
writer = CypherWriter(string)
writer.write_literal("MERGE ")
if self.__labels or self.__properties or self.__return:
node_name = "a"
else:
node_name = None
writer.write_node(self.__node, node_name)
if self.__labels:
writer.write_literal(" SET a")
for label in self.__labels:
writer.write_label(label)
if self.__properties:
writer.write_literal(" SET a={P}")
if self.__return:
writer.write_literal(" RETURN a")
return string.getvalue()
@property
def parameters(self):
""" Dictionary of parameters.
"""
parameters = {}
if self.__node.properties:
parameters["V"] = self.primary_value
if self.__properties:
parameters["P"] = self.properties
return parameters
class MergeNode(CypherTask):
""" :class:`.CypherTask` for `merging <http://neo4j.com/docs/stable/query-merge.html>`_
nodes.
::
>>> from py2neo import Graph
>>> graph = Graph()
>>> tx = graph.cypher.begin()
>>> tx.append(MergeNode("Person", "name", "Alice"))
>>> tx.commit()
| a
---+-----------------------
1 | (n170 {name:"Alice"})
"""
def __init__(self, primary_label, primary_key=None, primary_value=None):
CypherTask.__init__(self)
self.__node = Node(primary_label)
if primary_key is not None:
self.__node.properties[primary_key] = CypherParameter("V", primary_value)
self.__labels = LabelSet()
self.__properties = PropertySet()
self.__return = False
@property
def labels(self):
""" The full set of labels to apply to the merged node.
:rtype: :class:`py2neo.LabelSet`
"""
l = LabelSet(self.__labels)
l.update(self.__node.labels)
return l
@property
def properties(self):
""" The full set of properties to apply to the merged node.
:rtype: :class:`py2neo.PropertySet`
"""
p = PropertySet(self.__properties)
if self.primary_key:
p[self.primary_key] = self.primary_value
return p
@property
def primary_label(self):
""" The label on which to merge.
"""
return list(self.__node.labels)[0]
@property
def primary_key(self):
""" The property key on which to merge.
"""
try:
return list(self.__node.properties.keys())[0]
except IndexError:
return None
@property
def primary_value(self):
""" The property value on which to merge.
"""
try:
return list(self.__node.properties.values())[0].value
except IndexError:
return None
def set(self, *labels, **properties):
""" Extra labels and properties to apply to the node.
>>> merge = MergeNode("Person", "name", "Bob").set("Employee", employee_id=1234)
"""
self.__labels.update(labels)
self.__properties.update(properties)
return self
def with_return(self):
""" Include a RETURN clause in the statement.
"""
self.__return = True
return self
@property
def statement(self):
""" The full Cypher statement.
"""
string = StringIO()
writer = CypherWriter(string)
writer.write_literal("MERGE ")
if self.__labels or self.__properties or self.__return:
node_name = "a"
else:
node_name = None
writer.write_node(self.__node, node_name)
if self.__labels:
writer.write_literal(" SET a")
for label in self.__labels:
writer.write_label(label)
if self.__properties:
writer.write_literal(" SET a={P}")
if self.__return:
writer.write_literal(" RETURN a")
return string.getvalue()
@property
def parameters(self):
""" Dictionary of parameters.
"""
parameters = {}
if self.__node.properties:
parameters["V"] = self.primary_value
if self.__properties:
parameters["P"] = self.properties
return parameters
def __init__(self, node, labels):
Job.__init__(self, "PUT", Target(node, "labels"),
list(LabelSet(labels)))
