+++ /dev/null
-from sqlalchemy import create_engine
-from sqlalchemy.orm import sessionmaker
-
-from sfa.util.config import Config
-from sfa.util.sfalogging import logger
-
-from sqlalchemy import Column, Integer, String
-from sqlalchemy import Table, MetaData
-from sqlalchemy.ext.declarative import declarative_base
-
-from sqlalchemy.dialects import postgresql
-
-from sqlalchemy.exc import NoSuchTableError
-
-
-#Dict holding the columns names of the table as keys
-#and their type, used for creation of the table
-slice_table = {'record_id_user': 'integer PRIMARY KEY references X ON DELETE \
-CASCADE ON UPDATE CASCADE','oar_job_id':'integer DEFAULT -1', \
-'record_id_slice':'integer', 'slice_hrn':'text NOT NULL'}
-
-#Dict with all the specific senslab tables
-tablenames_dict = {'slab_xp': slice_table}
-
-
-SlabBase = declarative_base()
-
-
-
-class SenslabXP (SlabBase):
- """ SQL alchemy class to manipulate slice_senslab table in
- slab_sfa database.
-
- """
- __tablename__ = 'slab_xp'
-
-
- slice_hrn = Column(String)
- job_id = Column(Integer, primary_key = True)
- end_time = Column(Integer, nullable = False)
-
-
- #oar_job_id = Column( Integer,default = -1)
- #node_list = Column(postgresql.ARRAY(String), nullable =True)
-
- def __init__ (self, slice_hrn =None, job_id=None, end_time=None):
- """
- Defines a row of the slice_senslab table
- """
- if slice_hrn:
- self.slice_hrn = slice_hrn
- if job_id :
- self.job_id = job_id
- if end_time:
- self.end_time = end_time
-
-
- def __repr__(self):
- """Prints the SQLAlchemy record to the format defined
- by the function.
- """
- result = "<slab_xp : slice_hrn = %s , job_id %s end_time = %s" \
- %(self.slice_hrn, self.job_id, self.end_time)
- result += ">"
- return result
-
-
-
-class SlabDB:
- """ SQL Alchemy connection class.
- From alchemy.py
- """
- def __init__(self, config, debug = False):
- self.sl_base = SlabBase
- dbname = "slab_sfa"
- if debug == True :
- l_echo_pool = True
- l_echo = True
- else :
- l_echo_pool = False
- l_echo = False
-
- self.slab_session = None
- # the former PostgreSQL.py used the psycopg2 directly and was doing
- #self.connection.set_client_encoding("UNICODE")
- # it's unclear how to achieve this in sqlalchemy, nor if it's needed
- # at all
- # http://www.sqlalchemy.org/docs/dialects/postgresql.html#unicode
- # we indeed have /var/lib/pgsql/data/postgresql.conf where
- # this setting is unset, it might be an angle to tweak that if need be
- # try a unix socket first - omitting the hostname does the trick
- unix_url = "postgresql+psycopg2://%s:%s@:%s/%s"% \
- (config.SFA_DB_USER, config.SFA_DB_PASSWORD, \
- config.SFA_DB_PORT, dbname)
-
- # the TCP fallback method
- tcp_url = "postgresql+psycopg2://%s:%s@%s:%s/%s"% \
- (config.SFA_DB_USER, config.SFA_DB_PASSWORD, config.SFA_DB_HOST, \
- config.SFA_DB_PORT, dbname)
- for url in [ unix_url, tcp_url ] :
- try:
- self.slab_engine = create_engine (url, echo_pool = \
- l_echo_pool, echo = l_echo)
- self.check()
- self.url = url
- return
- except:
- pass
- self.slab_engine = None
- raise Exception, "Could not connect to database"
-
-
-
- def check (self):
- """ Cehck if a table exists by trying a selection
- on the table.
-
- """
- self.slab_engine.execute ("select 1").scalar()
-
-
- def session (self):
- """
- Creates a SQLalchemy session. Once the session object is created
- it should be used throughout the code for all the operations on
- tables for this given database.
-
- """
- if self.slab_session is None:
- Session = sessionmaker()
- self.slab_session = Session(bind = self.slab_engine)
- return self.slab_session
-
- def close_session(self):
- """
- Closes connection to database.
-
- """
- if self.slab_session is None: return
- self.slab_session.close()
- self.slab_session = None
-
-
- def exists(self, tablename):
- """
- Checks if the table specified as tablename exists.
-
- """
-
- try:
- metadata = MetaData (bind=self.slab_engine)
- table = Table (tablename, metadata, autoload=True)
- return True
-
- except NoSuchTableError:
- logger.log_exc("SLABPOSTGRES tablename %s does not exists" \
- %(tablename))
- return False
-
-
- def createtable(self):
- """
- Creates all the table sof the engine.
- Uses the global dictionnary holding the tablenames and the table schema.
-
- """
-
- logger.debug("SLABPOSTGRES createtable SlabBase.metadata.sorted_tables \
- %s \r\n engine %s" %(SlabBase.metadata.sorted_tables , slab_engine))
- SlabBase.metadata.create_all(slab_engine)
- return
-
-
-
-slab_alchemy = SlabDB(Config())
-slab_engine = slab_alchemy.slab_engine
-slab_dbsession = slab_alchemy.session()
git://git.onelab.eu / sfa.git / blobdiff