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# coding=utf-8
import threading
import MySQLdb
import MySQLdb.cursors
from settings import Settings
database_lock = threading.Lock()
try:
# Although SQLAlchemy is optional, it is highly recommended
import sqlalchemy.pool as pool
_mysql = pool.manage(module=_mysql,
pool_size=Settings.DATABASE_POOL_SIZE,
max_overflow=Settings.DATABASE_POOL_OVERFLOW)
Settings._.USING_SQLALCHEMY = True
except ImportError:
pass
def OpenDb():
if Settings._.CONN is None:
Settings._.CONN = MySQLdb.connect(host=Settings.DATABASE_HOST,
user=Settings.DATABASE_USERNAME,
passwd=Settings.DATABASE_PASSWORD,
db=Settings.DATABASE_DB,
cursorclass=MySQLdb.cursors.SSDictCursor)
def FetchAll(query, params=None):
"""
Query and fetch all results as a list
"""
db = Settings._.CONN
c = db.cursor()
c.execute(query, params)
return c.fetchall()
def FetchOne(query, params=None):
"""
Query and fetch only the first result
"""
db = Settings._.CONN
c = db.cursor()
c.execute(query, params)
return c.fetchone()
def UpdateDb(query, params=None):
"""
Update the DB (UPDATE/DELETE) and return # of affected rows
"""
db = Settings._.CONN
c = db.cursor()
c.execute(query, params)
return c.rowcount
def InsertDb(query, params=None):
"""
Insert into the DB and return the primary key of new row
"""
db = Settings._.CONN
c = db.cursor()
c.execute(query, params)
return c.lastrowid
def CloseDb():
if Settings._.CONN is not None:
Settings._.CONN.close()
Settings._.CONN = None
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