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database.py
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database.py
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from singleton import Singleton
import psycopg2
import logging
import config
@Singleton
class Database:
def __init__(self):
self.host = config.DATABASE_HOST
self.username = config.DATABASE_USERNAME
self.password = config.DATABASE_PASSWORD
self.port = config.DATABASE_PORT
self.dbname = config.DATABASE_NAME
self.conn = None
def connect(self):
if self.conn is None:
try:
self.conn = psycopg2.connect(
host=self.host,
user=self.username,
password=self.password,
port=self.port,
database=self.dbname,
sslmode="disable"
)
except psycopg2.DatabaseError as e:
logging.error(e)
raise e
finally:
logging.info('Connection opened successfully.')
def select_rows(self, query):
self.connect()
with self.conn.cursor() as cur:
cur.execute(query)
records = [row for row in cur.fetchall()]
return records
def execute(self, query):
self.connect()
with self.conn.cursor() as cur:
cur.execute(query)
def commit(self):
with self.conn.cursor() as cur:
cur.close()
self.conn.commit()
def close(self):
with self.conn.cursor() as cur:
cur.close()
def init_table(self):
self.execute("CREATE TABLE IF NOT EXISTS ngram_en(ngram text NOT NULL, count double precision, "
"CONSTRAINT ngramen_pkey PRIMARY KEY (ngram));")
self.execute("CREATE TABLE IF NOT EXISTS ngram_de(ngram text NOT NULL, count double precision, "
"CONSTRAINT ngramde_pkey PRIMARY KEY (ngram));")
self.commit()