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'''
File: db.py
Library to facilitate database IO
'''
import os
import sqlite3
ABS_PATH = os.path.dirname(os.path.abspath(__file__))
class db_base:
def __init__(self):
'''
Initialize conn/cursor for in-class use
'''
self.db_path = os.path.join(ABS_PATH, '../cache/cache.db')
self.cache_path = os.path.join(ABS_PATH, '../cache')
self.conn = self.db_init()
self.cursor = self.conn.cursor()
def db_init(self):
'''
Initialize database schema if db not found, return conn
'''
if not os.path.isdir(self.cache_path):
os.mkdir(self.cache_path)
if not os.path.isfile(self.db_path):
conn = sqlite3.connect(self.db_path)
print('database not found, initializing...')
conn.execute('''CREATE TABLE cache (hash TEXT, content_type
TEXT)''')
conn.commit()
conn.close()
conn = sqlite3.connect(self.db_path)
conn.row_factory = sqlite3.Row
return conn
def cache_add(self, _hash, content_type):
self.cursor.execute('''INSERT INTO cache(hash, content_type)
VALUES(?,?)''', (_hash, content_type,))
self.save()
def cash_del(self, _hash):
self.cursor.execute('DELETE FROM cache WHERE hash=?', (_hash,))
self.save()
def is_cached(self, _hash):
self.cursor.execute('''SELECT COUNT(*) FROM cache WHERE
hash=?''', (_hash,))
q_count = self.cursor.fetchone()
if q_count[0] > 0:
return True
return False
def get_content_type(self, _hash):
self.cursor.execute('SELECT * FROM cache WHERE hash=?', (_hash,))
return self.cursor.fetchall()[0][1]
def save(self):
self.conn.commit()
def close(self):
self.conn.close()
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