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# coding=utf-8
import collections
import json
from . import get_connection, return_connection
__all__ = ['CodeqUser', 'Solution']
class CodeqUser(collections.namedtuple('CodeqUser', ['id', 'username', 'password', 'name', 'email', 'is_admin', 'is_active', 'date_joined', 'last_login'])):
__sql_prefix = 'select id, username, password, name, email, is_admin, is_active, date_joined, last_login from codeq_user'
@staticmethod
def get(**kwargs):
return _general_get(kwargs, CodeqUser, CodeqUser.__sql_prefix)
@staticmethod
def list():
return _general_list(CodeqUser, CodeqUser.__sql_prefix)
@staticmethod
def filter(**kwargs):
return _general_filter(kwargs, CodeqUser, CodeqUser.__sql_prefix)
@staticmethod
def solved_problems(user_id, language):
return _run_sql('select g.identifier, p.identifier from solution s inner join problem p on p.id = s.problem_id inner join problem_group g on g.id = p.problem_group_id inner join language l on l.id = p.language_id where s.codeq_user_id = %s and l.identifier = %s and s.done = True', (user_id, language), fetch_one=False)
class Problem(collections.namedtuple('Problem', ['id', 'language', 'group', 'identifier'])):
__sql_prefix = '''\
select p.id, l.identifier, g.identifier, p.identifier
from problem p
inner join problem_group g on g.id = p.problem_group_id
inner join language l on l.id = p.language_id'''
__sql_order = 'p.language_id, p.problem_group_id, p.id'
@staticmethod
def get(**kwargs):
kwargs = {'p.'+k: v for k, v in kwargs.items()}
return _general_get(kwargs, Problem, Problem.__sql_prefix)
@staticmethod
def list():
return _general_list(Problem, Problem.__sql_prefix, order=Problem.__sql_order)
@staticmethod
def filter(**kwargs):
kwargs = {'p.'+k: v for k, v in kwargs.items()}
return _general_filter(kwargs, Problem, Problem.__sql_prefix, order=Problem.__sql_order)
# known as Attempt in the original code
class Solution(collections.namedtuple('Solution', ['id', 'done', 'content', 'problem_id', 'codeq_user_id', 'trace'])):
__sql_prefix = 'select id, done, content, problem_id, codeq_user_id, trace::text from solution'
__row_conversion = lambda row: (row[0], row[1], row[2], row[3], row[4], json.loads(row[5]))
@staticmethod
def get(**kwargs):
return _general_get(kwargs, Solution, Solution.__sql_prefix, Solution.__row_conversion)
@staticmethod
def list():
return _general_list(Solution, Solution.__sql_prefix, Solution.__row_conversion)
@staticmethod
def filter(**kwargs):
return _general_filter(kwargs, Solution, Solution.__sql_prefix, Solution.__row_conversion)
def _no_row_conversion(row):
return row
def _general_get(kwargs_dict, clazz, sql_select, row_conversion_fn=_no_row_conversion):
conditions = []
parameters = []
for field_name, field_value in kwargs_dict.items():
conditions.append(field_name + ' = %s')
parameters.append(field_value)
if len(conditions) == 0:
return None
conn = get_connection()
try:
cur = conn.cursor('crsr1') # a named cursor: scrolling is done on the server
cur.arraysize = 1 # scroll unit in the number of rows
try:
cur.execute(sql_select + ' where ' + ' and '.join(conditions), parameters)
row = cur.fetchone()
if row:
return clazz(*row_conversion_fn(row))
return None
finally:
cur.close()
finally:
conn.commit()
return_connection(conn)
def _general_filter(kwargs_dict, clazz, sql_select, row_conversion_fn=_no_row_conversion, order='id'):
conditions = []
parameters = []
for field_name, field_value in kwargs_dict.items():
conditions.append(field_name + ' = %s')
parameters.append(field_value)
if len(conditions) == 0:
return _general_list(clazz, sql_select)
conn = get_connection()
try:
cur = conn.cursor('crsr2') # a named cursor: scrolling is done on the server
cur.arraysize = 10000 # scroll unit in the number of rows
try:
cur.execute(sql_select + ' where ' + ' and '.join(conditions) + ' order by ' + order, parameters)
result = []
row = cur.fetchone()
while row:
result.append(clazz(*row_conversion_fn(row)))
row = cur.fetchone()
return result
finally:
cur.close()
finally:
conn.commit()
return_connection(conn)
def _general_list(clazz, sql_select, row_conversion_fn=_no_row_conversion, order='id'):
conn = get_connection()
try:
cur = conn.cursor('crsr3') # a named cursor: scrolling is done on the server
cur.arraysize = 10000 # scroll unit in the number of rows
try:
cur.execute(sql_select + ' order by ' + order)
result = []
row = cur.fetchone()
while row:
result.append(clazz(*row_conversion_fn(row)))
row = cur.fetchone()
return result
finally:
cur.close()
finally:
conn.commit()
return_connection(conn)
def _run_sql(sql, params, fetch_one=False):
conn = get_connection()
try:
cur = conn.cursor()
try:
cur.execute(sql, params)
if fetch_one:
return cur.fetchone()
else:
return cur.fetchall()
finally:
cur.close()
finally:
conn.commit()
return_connection(conn)
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