245 lines
8.1 KiB
Python
245 lines
8.1 KiB
Python
#!/usr/bin/env python3
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import sys
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#import pymysql.cursors
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#pymysql.install_as_MySQLdb
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#import sqlalchemy.pool as pool
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from sqlalchemy import create_engine
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import traceback
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#mypool=None
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#engine = create_engine('sqlite:///:memory:', echo=True)
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engine=None
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class SqlClass:
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"""Class used how interface to sqlalchemy for connect to mysql engine
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Attributes:
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cursors_connect (pymysql.cursors.DictCursor): Cursor dict connection to database
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disable_pool (boolean): If True then not exists mysql pool, if False, use sql pool for better connections.
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pymsql_install (boolean): If True, pymysql is used how mysqldb classic python module.
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pool_size (int): The size of the mysql pool.
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"""
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cursors_connect=None
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disable_pool=False
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pymysql_install=False
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pool_size=15
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def __init__(self, connection):
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"""
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Args:
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connection (dict): A dict with the configurations of SqlClass connection
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Attributes:
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error_connection (str): A string where errors are saved
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connection (dict): A dict with the configurations of SqlClass connection
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conn (MySQL Connection): A PyMySQL or Mysqldb connection
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connected (bool): Simple bool for check if was connected to mysql
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pool_recycle (int): Time limite for recycle the pool by inactivity
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"""
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#self.max_overflow=-1
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self.error_connection=""
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# Data of connection
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self.connection=connection
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# Sql connection
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self.conn=None
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self.connected=False
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self.pool_recycle=3600
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self.connect()
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def connect(self):
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"""Method for connect to mysql db using pymysql or mysqldb
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"""
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global engine
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if not SqlClass.disable_pool:
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if not engine:
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try:
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if self.connection['db_type']=='pymysql':
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import pymysql.cursors
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pymysql.install_as_MySQLdb
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SqlClass.pymysql_install=True
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SqlClass.cursors_connect=pymysql.cursors.DictCursor
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else:
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import MySQLdb.cursors
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SqlClass.cursors_connect=MySQLdb.cursors.DictCursor
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engine=create_engine("mysql+%s://%s:%s@%s/%s?charset=utf8mb4" % (self.connection['db_type'], self.connection['user'], self.connection['password'], self.connection['host'], self.connection['db']), pool_recycle=self.pool_recycle, echo_pool=True, pool_size=self.pool_size, pool_pre_ping=True)
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except:
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e = sys.exc_info()[0]
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v = sys.exc_info()[1]
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self.error_connection="Error in connection: %s %s" % (e, v)
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#self.conn.close()
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raise NameError(self.error_connection)
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self.conn=engine.raw_connection()
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#self.conn.ping(True)
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else:
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if self.connection['db_type']=='pymysql':
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import pymysql.cursors
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if not SqlClass.pymysql_install:
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pymysql.install_as_MySQLdb
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SqlClass.pymysql_install=True
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"""
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connection = pymysql.connect(host='localhost',
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user='user',
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password='passwd',
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database='db',
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charset='utf8mb4',
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cursorclass=pymysql.cursors.DictCursor)
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"""
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self.conn=pymysql.connect(host=self.connection['host'], user=self.connection['user'], passwd=self.connection['password'], db=self.connection['db'], charset='utf8mb4', cursorclass=pymysql.cursors.DictCursor)
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else:
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import MySQLdb.cursors
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self.conn=MySQLdb.connect(host=self.connection['host'],
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user=self.connection['user'],
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passwd=self.connection['password'],
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db=self.connection['db'],
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charset='utf8mb4',
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cursorclass=MySQLdb.cursors.DictCursor)
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pass
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"""
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if self.conn==None:
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try:
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def getconn():
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return pymysql.connect(self.connection['host'],
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user=self.connection['user'],
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passwd=self.connection['password'],
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db=self.connection['db'],
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charset='utf8mb4',
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cursorclass=pymysql.cursors.DictCursor)
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if mypool==None:
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mypool=pool.QueuePool(getconn, max_overflow=self.max_overflow, pool_size=self.pool_size, recycle=self.pool_recycle, use_threadlocal=True)
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self.conn=mypool.connect()
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self.conn.ping(True)
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self.connected=True
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except:
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e = sys.exc_info()[0]
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v = sys.exc_info()[1]
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self.error_connection="Error in connection: %s %s" % (e, v)
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self.conn.close()
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raise NameError(self.error_connection)
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"""
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#Make def query more simple if not debugging.
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def query(self, sql_query, arguments=[], name_connection="default"):
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"""Method for send a sql query to mysql server
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Args:
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sql_query (str): The sql sentence to execute. For data you should use %s character.
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arguments (list): The data used in sql sentence. This data substitute the %s characters.
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name_connection (str): The name of dict element with the configuration of connection, without used in this moment.
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"""
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cursor=self.conn.cursor(SqlClass.cursors_connect)
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try:
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cursor.execute(sql_query, arguments)
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self.conn.commit()
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return cursor
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except:
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e = sys.exc_info()[0]
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v = sys.exc_info()[1]
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if hasattr(cursor, '_last_executed'):
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sql_query=cursor._last_executed
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self.error_connection="Error in query ||%s||Values: %s" % (sql_query, str(arguments))
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self.conn.close()
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#return False
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raise NameError(self.error_connection)
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#self.connect()
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#if fetch_type=="ASSOC":
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#fetch_type=MySQLdb.cursors.DictCursor
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#with self.conn.cursor(MySQLdb.cursors.DictCursor) as cursor:
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"""
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cursor=self.conn.cursor(pymysql.cursors.DictCursor)
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try:
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cursor.execute(sql_query, arguments)
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self.conn.commit()
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return cursor
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except:
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e = sys.exc_info()[0]
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v = sys.exc_info()[1]
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if hasattr(cursor, '_last_executed'):
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sql_query=cursor._last_executed
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#, traceback.format_exc()
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self.error_connection="Error in query ||%s||Values: %s" % (sql_query, str(arguments))
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#return False
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raise NameError(self.error_connection)
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"""
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#Fetcho row return dictionary if is defined in query.
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#def fetch(self, cursor):
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#return cursor.fetchone()
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def __del__(self):
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"""Typical method used when class is deleted from memory. Close the connextion if exists.
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"""
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if self.conn:
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self.conn.close()
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def close(self, name_connection="default"):
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"""Method used for close the connection if you want close connection and open other.
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"""
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if self.conn:
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self.conn.close()
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self.conn=None
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pass
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