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| class DBUtil:
__pool = None
def __init__(self, host, user, password, database, port=3306, charset="utf8"):
self.host = host
self.port = int(port)
self.user = user
self.password = str(password)
self.database = database
self.charset = charset
self.conn = self.__get_connection()
self.cursor = self.conn.cursor()
def __get_connection(self):
if DBUtil.__pool is None:
__pool = PooledDB(
creator=pymysql,
mincached=1,
maxcached=20,
host=self.host,
port=self.port,
user=self.user,
passwd=self.password,
db=self.database,
use_unicode=False,
charset=self.charset,
)
return __pool.connection()
def begin(self):
"""
开启事务
"""
self.conn.autocommit(0)
def end(self, option="commit"):
"""
结束事务
"""
if option == "commit":
self.conn.commit()
else:
self.conn.rollback()
def connect(self):
"""
直接连接数据库
:return conn: pymysql连接
"""
try:
conn = pymysql.connect(
host=self.host,
user=self.user,
password=self.password,
database=self.database,
port=self.port,
use_unicode=True,
charset=self.charset,
cursor=DictCursor,
)
return conn
except Exception as e:
logging.error("Error connecting to mysql server.")
raise
def close(self):
try:
self.cursor.close()
self.conn.close()
except Exception as e:
logging.error("Error closing connection to mysql server")
def get_one(self, sql):
try:
self.cursor.execute(sql)
res = self.cursor.fetchone()
self.close()
return res
except Exception as e:
raise
def get_all(self, sql):
try:
self.cursor.execute(sql)
res = self.cursor.fetchall()
self.close()
return res
except Exception as e:
raise
def get_all_obj(self, sql, table_name, *args):
resList = []
fields_list = []
try:
if len(args) > 0:
for item in args:
fields_list.append(item)
else:
fields_sql = (
"select COLUMN_NAME from information_schema.COLUMNS where table_name = '%s' and table_schema = '%s'"
% (table_name, self.conn_name)
)
fields = self.get_all(fields_sql)
for item in fields:
fields_list.append(item[0])
res = self.get_all(sql)
for item in res:
obj = {}
count = 0
for x in item:
obj[fields_list[count]] = x
count += 1
resList.append(obj)
return resList
except Exception as e:
raise
def insert(self, sql, params=None):
"""
插入操作
:return count: 影响的行数
"""
return self.__edit(sql, params)
def update(self, sql, params=None):
"""
更新操作
:return count: 影响的行数
"""
return self.__edit(sql, params)
def delete(self, sql, params=None):
"""
删除操作
:return count: 影响的行数
"""
return self.__edit(sql, params)
def __edit(self, sql, params=None):
max_attempts = 3
attempt = 0
count = 0
while attempt < max_attempts:
try:
self.conn = self.__get_connection()
self.cursor = self.conn.cursor()
if params is None:
count = self.cursor.execute(sql)
else:
count = self.cursor.execute(sql, params)
self.conn.commit()
self.close()
except Exception as e:
logging.error(e)
self.conn.rollback()
count = 0
return count
def execute(self, sql, params=None):
max_attempts = 3
attempt = 0
while attempt < max_attempts:
try:
self.conn = self.__get_connection()
self.cursor = self.conn.cursor()
if params is None:
result = self.cursor.execute(sql)
else:
result = self.cursor.execute(sql, params)
self.conn.commit()
self.close()
return result
except Exception as e:
attempt += 1
logging.warning(f"retry: {attempt}")
logging.exception(e)
def truncate(self, table):
sql = f"truncate table {table}"
self.execute(sql)
def executemany(self, sql, data):
max_attempts = 3
attempt = 0
while attempt < max_attempts:
try:
self.conn = self.__get_connection()
self.cursor = self.conn.cursor()
result = self.cursor.executemany(sql, data)
self.conn.commit()
self.close()
return result
except Exception as e:
attempt += 1
logging.warning(f"retry: {attempt}")
logging.exception(e)
config_filepath = os.path.dirname(os.path.dirname(__file__)) + "/config/dev.ini"
config = Config(config_filepath).get_content("MYSQL")
conn = DBUtil(
host=config["HOST"],
port=int(config["PORT"]),
database=config["DATABASE"],
user=config["USER"],
password=config["PASSWORD"],
charset=config["CHARSET"],
)
def get_connection():
return conn
if __name__ == "__main__":
db = get_connection()
cursor = db.cursor
cursor.execute("SELECT VERSION()")
data = cursor.fetchone()
print("Database version : %s " % data)
db.close()
|