def __init__(self, q_arr, param_set={}):
"""
@param q_arr: cypher query as an array, the string is ' '.join(q_str_or_array)
is used to convert it to string type
"""
assert type(q_arr) is list
# establish query type
self.q_str = ' '.join(q_arr) # FIXME: rm
self.pt_root = Cypher_Parser().parse_expression(self.q_str)
self.param_set = param_set
def __init__(self, q_arr, param_set={}):
"""
@param q_str_or_array: cypher query to add - if passed as an array ' '.join(q_str_or_array)
is used to convert it to string type
"""
assert type(q_arr) is list
# establish query type
self.q_str = ' '.join(q_arr) # FIXME: rm
self.pt_root = Cypher_Parser().parse_expression(self.q_str)
self.param_set = param_set
class DB_Query(object):
"""
DB query object
"""
def __init__(self, q_arr, param_set={}):
"""
@param q_arr: cypher query as an array, the string is ' '.join(q_str_or_array)
is used to convert it to string type
"""
assert type(q_arr) is list
# establish query type
self.q_str = ' '.join(q_arr) # FIXME: rm
self.pt_root = Cypher_Parser().parse_expression(self.q_str)
self.param_set = param_set
def __str__(self):
return self.pt_root.str__cypher_query()
def __repr__(self):
return 'q: %s, params: %s\n%s' % (self.pt_root.str__cypher_query(),
self.param_set,
self.pt_root.str__struct_tree())
def __iter__(self):
for keyword, clause_set in self.pt_root.index__kw_to_clause_set(
).items():
yield keyword, clause_set
def t__add_node_filter__meta_label(self):
if Query_Struct_Type.w == self.query_struct_type:
return
meta_label_cond = '0 = length(filter(_lbl in labels(n) where _lbl in {meta_label_set}))' # filter nodes with meta labels
c_set__where = self.pt_root.clause_set_by_kw('where')
if not c_set__where:
c_set__match = self.pt_root.clause_set_by_kw('match')
first_match_clause = c_set__match.pop()
wc = first_match_clause.spawn_sibling__adjacent(e_clause__where)
wc.spawn_child(e_keyword, 'where')
wc.spawn_child(e_value).value = meta_label_cond
else: # where clause present
assert len(
c_set__where
) == 1, 't__add_node_filter__meta_label: no support for multi-where clauses query transformation'
wc = c_set__where[0]
wc_cond = wc.condition_value
wc.set_condition(meta_label_cond + ' and ' + wc_cond)
self.param_set['meta_label_set'] = neo4j_schema.meta_label_set
@property
def query_struct_type(self):
"""
calc query_structure_type: read|write|read-write
"""
r = False
w = False
for kw, _clause_set in self.pt_root.index__kw_to_clause_set().items():
if kw in neo4j_cypher_parser.tok_set__kw__write:
w = True
if kw == 'match':
r = True
if r and w: return Query_Struct_Type.rw
if r and not w: return Query_Struct_Type.r
if w and not r: return Query_Struct_Type.w
return Query_Struct_Type.unknown
def str__cypher_query(self):
return self.pt_root.str__cypher_query()
class DB_Query(object):
"""
DB query object
"""
def __init__(self, q_arr, param_set={}):
"""
@param q_str_or_array: cypher query to add - if passed as an array ' '.join(q_str_or_array)
is used to convert it to string type
"""
assert type(q_arr) is list
# establish query type
self.q_str = ' '.join(q_arr) # FIXME: rm
self.pt_root = Cypher_Parser().parse_expression(self.q_str)
self.param_set = param_set
def __str__(self):
return self.pt_root.str__cypher_query()
def __repr__(self):
return 'q: %s, params: %s\n%s' % (self.pt_root.str__cypher_query(),
self.param_set,
self.pt_root.str__struct_tree())
def __iter__(self):
for keyword, clause_set in self.pt_root.index__kw_to_clause_set().items():
yield keyword, clause_set
def t__add_node_filter__meta_label(self):
if Query_Struct_Type.w == self.query_struct_type:
return
meta_label_cond = '0 = length(filter(_lbl in labels(n) where _lbl in {meta_label_set}))' # filter nodes with meta labels
c_set__where = self.pt_root.clause_set_by_kw('where')
if not c_set__where:
c_set__match = self.pt_root.clause_set_by_kw('match')
first_match_clause = c_set__match.pop()
wc = first_match_clause.spawn_sibling__adjacent(e_clause__where)
wc.spawn_child(e_keyword, 'where')
wc.spawn_child(e_value).value = meta_label_cond
else: # where clause present
assert len(c_set__where) == 1, 't__add_node_filter__meta_label: no support for multi-where clauses query transformation'
wc = c_set__where[0]
wc_cond = wc.condition_value
wc.set_condition(meta_label_cond + ' and ' + wc_cond)
self.param_set['meta_label_set'] = neo4j_schema.meta_label_set
@property
def query_struct_type(self):
"""
calc query_structure_type: read|write|read-write
"""
r = False
w = False
for kw, _clause_set in self.pt_root.index__kw_to_clause_set().items():
if kw in neo4j_cypher_parser.tok_set__kw__write:
w = True
if kw == 'match':
r = True
if r and w: return Query_Struct_Type.rw
if r and not w: return Query_Struct_Type.r
if w and not r: return Query_Struct_Type.w
return Query_Struct_Type.unknown
def str__cypher_query(self):
return self.pt_root.str__cypher_query()
