Added sqlutils functions

Database/sqlutils.py

@@ -0,0 +1,73 @@
+# -*- coding: utf-8 -*-
+import os
+import re
+import logging as logger
+
+import sqlalchemy as sqla
+from django.conf import settings
+
+
+os.environ.setdefault("DJANGO_SETTINGS_MODULE", "Lodel.settings")
+
+ENGINES = {'mysql': {
+				'driver': 'pymysql',
+				'encoding': 'utf8'
+			},
+			'postgresql': {
+				'driver': 'psycopg2',
+				'encoding': 'utf8',
+			},
+			'sqlite': {
+				'driver': 'pysqlite',
+				'encoding': 'utf8',
+			},
+}
+
+sqlcfg = settings.LODEL2SQLWRAPPER
+
+def getEngine(ename = 'default', sqlalogging = None):
+	""" Return a sqlalchemy engine
+		@param read bool: If True return the read engine, else 
+		return the write one
+		@return a sqlachemy engine instance
+
+		@todo Put the check on db config in SqlWrapper.checkConf()
+	"""
+	#Loading confs
+	cfg = sqlcfg['db'][ename]
+
+	edata = ENGINES[cfg['ENGINE']] #engine infos
+	conn_str = ""
+
+	if cfg['ENGINE'] == 'sqlite':
+		#Sqlite connection string
+		conn_str = '%s+%s:///%s'%( cfg['ENGINE'],
+			edata['driver'],
+			cfg['NAME'])
+	else:
+		#Mysql and Postgres connection string
+		user = cfg['USER']
+		user += (':'+cfg['PASSWORD'] if 'PASSWORD' in cfg else '')
+		
+		if 'HOST' not in cfg:
+			logger.info('Not HOST in configuration, using localhost')
+			host = 'localhost'
+		else:
+			host = cfg['HOST']
+
+		host += (':'+cfg['PORT'] if 'PORT' in cfg else '')
+
+		conn_str = '%s+%s://'%(cfg['ENGINE'], edata['driver'])
+		conn_str += '%s@%s/%s'%(user,host,cfg['NAME'])
+
+
+	ret = sqla.create_engine(conn_str, encoding=edata['encoding'], echo=sqlalogging)
+
+	logger.debug("Getting engine :"+str(ret))
+
+	return ret
+
+def meta(engine):
+		res = sqla.MetaData()
+		res.reflect(bind=engine)
+		return res