def read_sparql(self, query, bindings_set=[{}], keep_old_bindings=False):
"""
read from the sparql database
@arg query the query in one long string, a list of string or triples_set
@arg bindings_set is a set of bindings to apply on the way in
@arg keep_old_bindings if True will keep variable bound in the incoming
bindings_set in the new bindings_set
@return a new set of bindings
"""
if not self.sparql:
raise Exception("sparql not initialized")
results = []
query_triples = self.parser.parse(query)
#p('query_triples',query_triples)
#for triples in sub_var_bindings_set(query_triples, bindings_set) :
for bindings in explode_bindings_set(bindings_set):
triples = sub_var_bindings(query_triples, bindings)
#self.sanitize_vars(triples)
read_bindings_set = self.sparql.read(triples,
outvarnamespace=LitVar)
if keep_old_bindings:
#p('bindings',bindings)
#p('read_bindings_set',read_bindings_set)
for read_bindings in read_bindings_set:
new_bindings = copy.copy(bindings)
new_bindings.update(read_bindings)
results.append(new_bindings)
else:
results.extend(read_bindings_set)
return results
def read_sparql(self, query, bindings_set = [{}], keep_old_bindings = False) :
"""
read from the sparql database
@arg query the query in one long string, a list of string or triples_set
@arg bindings_set is a set of bindings to apply on the way in
@arg keep_old_bindings if True will keep variable bound in the incoming
bindings_set in the new bindings_set
@return a new set of bindings
"""
if not self.sparql :
raise Exception("sparql not initialized")
results = []
query_triples = self.parser.parse(query)
#p('query_triples',query_triples)
#for triples in sub_var_bindings_set(query_triples, bindings_set) :
for bindings in explode_bindings_set(bindings_set) :
triples = sub_var_bindings(query_triples, bindings)
#self.sanitize_vars(triples)
read_bindings_set = self.sparql.read(triples, outvarnamespace = LitVar)
if keep_old_bindings :
#p('bindings',bindings)
#p('read_bindings_set',read_bindings_set)
for read_bindings in read_bindings_set :
new_bindings = copy.copy(bindings)
new_bindings.update(read_bindings)
results.append(new_bindings)
else :
results.extend(read_bindings_set)
return results
def write_sparql(self, query, bindings_set = [{}]) :
"""
write triples into sparql database.
NOTE: any URI which is_var will be converted to a fresh bnode URI
"""
if not self.sparql :
raise Exception("sparql not initialized")
query_triples = self.parser.parse(query)
bindings_set = explode_bindings_set(bindings_set)
for bindings in bindings_set :
triples = sub_var_bindings(query_triples, bindings)
missing_vars = find_vars(triples)
if len(missing_vars) is not 0 :
new_bindings = dict([(var, self.urigen()) for var in missing_vars])
triples = sub_var_bindings(triples, new_bindings)
bindings.update(new_bindings)
self.sparql.write(triples)
return bindings_set
def write_sparql(self, query, bindings_set=[{}]):
"""
write triples into sparql database.
NOTE: any URI which is_var will be converted to a fresh bnode URI
"""
if not self.sparql:
raise Exception("sparql not initialized")
query_triples = self.parser.parse(query)
bindings_set = explode_bindings_set(bindings_set)
for bindings in bindings_set:
triples = sub_var_bindings(query_triples, bindings)
missing_vars = find_vars(triples)
if len(missing_vars) is not 0:
new_bindings = dict([(var, self.urigen())
for var in missing_vars])
triples = sub_var_bindings(triples, new_bindings)
bindings.update(new_bindings)
self.sparql.write(triples)
return bindings_set
def read_translate(self, query, bindings_set=[{}], reqd_bound_vars=[]):
query_triples = self.parser.parse(query)
ret_evals = []
bindings_set = explode_bindings_set(bindings_set)
if len(reqd_bound_vars) == 0:
reqd_bound_vars = find_vars(query_triples, is_lit_var)
if len(reqd_bound_vars) == 0:
p('Warning: no required bound variables. Are there any _vars?'
)
#for triples in sub_var_bindings_set(query_triples, bindings_set) :
for bindings in bindings_set:
#p('bindings',bindings)
#p('reqd_bound_vars',reqd_bound_vars)
new_reqd_bound_vars = []
provided_bindings = []
for var in reqd_bound_vars:
if var in bindings:
provided_bindings.append(var)
else:
new_reqd_bound_vars.append(var)
reqd_bound_vars = new_reqd_bound_vars
#p('reqd_bound_vars',reqd_bound_vars)
#p('provided_bindings',provided_bindings)
triples = sub_var_bindings(query_triples, bindings)
begin_compile = time.time()
ret_comp = self.compiler.compile(triples, reqd_bound_vars)
end_compile = time.time()
#p('ret_comp',ret_comp)
if 'time' in self.options:
print 'compile time:', end_compile - begin_compile
self.cum_comp_time += end_compile - begin_compile
if ret_comp == False:
raise CompilerException(
"Couldn't compile ... sorry I don't have more here")
begin_eval = time.time()
#for i in range(100) :
ret_eval = self.evaluator.evaluate(ret_comp)
end_eval = time.time()
if 'time' in self.options:
print 'eval time:', end_eval - begin_eval
self.cum_eval_time += end_eval - begin_eval
for ret in ret_eval:
for var in provided_bindings:
ret[var] = bindings[var]
#p('ret_eval',ret_eval)
ret_evals.extend(ret_eval)
return ret_evals
def read_translate(self, query, bindings_set = [{}], reqd_bound_vars = []) :
query_triples = self.parser.parse(query)
ret_evals = []
bindings_set = explode_bindings_set(bindings_set)
if len(reqd_bound_vars) == 0 :
reqd_bound_vars = find_vars(query_triples, is_lit_var)
if len(reqd_bound_vars) == 0 :
p('Warning: no required bound variables. Are there any _vars?')
#for triples in sub_var_bindings_set(query_triples, bindings_set) :
for bindings in bindings_set :
#p('bindings',bindings)
#p('reqd_bound_vars',reqd_bound_vars)
new_reqd_bound_vars = []
provided_bindings = []
for var in reqd_bound_vars :
if var in bindings :
provided_bindings.append(var)
else :
new_reqd_bound_vars.append(var)
reqd_bound_vars = new_reqd_bound_vars
#p('reqd_bound_vars',reqd_bound_vars)
#p('provided_bindings',provided_bindings)
triples = sub_var_bindings(query_triples, bindings)
begin_compile = time.time()
ret_comp = self.compiler.compile(triples, reqd_bound_vars)
end_compile = time.time()
#p('ret_comp',ret_comp)
if 'time' in self.options :
print 'compile time:',end_compile-begin_compile
self.cum_comp_time += end_compile-begin_compile
if ret_comp == False :
raise CompilerException("Couldn't compile ... sorry I don't have more here")
begin_eval = time.time()
#for i in range(100) :
ret_eval = self.evaluator.evaluate(ret_comp)
end_eval = time.time()
if 'time' in self.options :
print 'eval time:',end_eval-begin_eval
self.cum_eval_time += end_eval-begin_eval
for ret in ret_eval :
for var in provided_bindings :
ret[var] = bindings[var]
#p('ret_eval',ret_eval)
ret_evals.extend(ret_eval)
return ret_evals
