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| import time
from application.common.classes.Logger import Logger
from mysql.connector.pooling import MySQLConnectionPool
from application.common.exception.MySqlException import MySqlException
class MySql:
_instance = None
_initialized = False
# 确保单例
def __new__(cls, *args, **kwargs):
if cls._instance is None:
cls._instance = object.__new__(cls)
return cls._instance
def __init__(self, config=None):
if not self.__class__._initialized:
self.expire = 1800
self.host = config.MYSQL_HOST
self.port = config.MYSQL_PORT
self.user = config.MYSQL_USER
self.passwd = config.MYSQL_PASSWORD
self.database = config.MYSQL_DATABASE
self.ssl_disabled = config.SSL_DISABLED
self.pool_size = config.MYSQL_MAX_CONNECTIONS
self.use_pure = config.USE_PURE
self.__new_connect()
self.__class__._initialized = True
def __new_connect(self):
self.mysql_pool = MySQLConnectionPool(
host=self.host,
port=self.port,
user=self.user,
passwd=self.passwd,
database=self.database,
ssl_disabled=self.ssl_disabled,
pool_size=self.pool_size,
use_pure=self.use_pure
)
def __get_connection(self):
try:
conn = self.mysql_pool.get_connection()
if conn is None:
self.__new_connect()
time.sleep(1)
return self.__get_connection()
else:
return conn
except Exception as e:
log = Logger()
log.error_trace()
self.__new_connect()
time.sleep(5)
return self.__get_connection()
def select(self, sql: str, arg=None):
if not arg == None and not isinstance(arg, tuple):
arg = (arg,)
with self.__get_connection() as conn:
with conn.cursor(dictionary=True) as cur:
cur.execute(sql, arg)
result = cur.fetchall()
return result
def insert(self, sql: str, arg=None):
if not arg == None and not isinstance(arg, tuple):
arg = (arg,)
with self.__get_connection() as conn:
with conn.cursor() as cur:
try:
cur.execute(sql, arg)
conn.commit()
return True
except Exception as e:
log = Logger()
log.error_trace()
conn.rollback()
return False
def insert_many(self, sql: str, arg=None):
if not arg == None and not isinstance(arg, list) and not all(isinstance(i, tuple) for i in arg):
raise MySqlException("insertMany参数必须为list[tuple]类型")
with self.__get_connection() as conn:
with conn.cursor() as cur:
try:
cur.executemany(sql, arg)
conn.commit()
return True
except Exception as e:
log = Logger()
log.error_trace()
conn.rollback()
return False
def update(self, sql: str, arg=None):
if not arg == None and not isinstance(arg, tuple):
arg = (arg,)
with self.__get_connection() as conn:
with conn.cursor() as cur:
try:
cur.execute(sql, arg)
conn.commit()
return True
except Exception as e:
log = Logger()
log.error_trace()
conn.rollback()
return False
def alter(self, sql: str, arg=None):
if not arg == None and not isinstance(arg, tuple):
arg = (arg,)
with self.__get_connection() as conn:
with conn.cursor() as cur:
try:
cur.execute(sql, arg)
conn.commit()
return True
except Exception as e:
log = Logger()
log.error_trace()
conn.rollback()
return False
def get_index(self, table: str):
sql = """
show
INDEX
from
""" + table + """
where
not Key_name = 'PRIMARY'
"""
with self.__get_connection() as conn:
with conn.cursor() as cur:
try:
cur.execute(sql)
result = cur.fetchall()
index_names = []
for i in result:
index_names.append(i[2])
return index_names
except Exception as e:
log = Logger()
log.error_trace()
conn.rollback()
return []
def truncate(self, sql: str, arg=None):
if not arg == None and not isinstance(arg, tuple):
arg = (arg,)
with self.__get_connection() as conn:
with conn.cursor() as cur:
try:
cur.execute(sql, arg)
conn.commit()
return True
except Exception as e:
log = Logger()
log.error_trace()
conn.rollback()
return False
|