File size: 2,666 Bytes
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Created on 01/10/2012
@author: Amr Hassan
'''
import psycopg2
from psycopg2 import extras
import math
import string
import sys
import DBConnection
import logging
from io import BytesIO
import numpy
import struct
class DBInterface(object):
'''
This class will handle the interface with the DB
'''
FormatMapping={'int':'INT',
'float':'FLOAT',
'long long':'BIGINT'
}
def __init__(self,CurrentSAGEStruct,Options,CommRank):
'''
Constructor
'''
self.Options=Options
self.CurrentSAGEStruct=CurrentSAGEStruct
self.DBConnection=DBConnection.DBConnection(Options)
def CloseConnections(self):
self.DBConnection.CloseConnections()
def GetListofUnProcessedTrees(self,CommSize,CommRank):
return self.DBConnection.ExecuteQuerySQLStatment("SELECT * FROM TreeProcessingSummary where Processed=FALSE and mod(LoadingTreeID,"+str(CommSize)+")="+str(CommRank)+" order by LoadingTreeID;")
def SetTreeAsProcessed(self,TreeID):
self.DBConnection.ExecuteNoQuerySQLStatment("UPDATE TreeProcessingSummary set Processed=TRUE where LoadingTreeID= "+str(TreeID))
def CreateNewTree(self,TableID,TreeData):
# TreeData Must be a numpy fields array with the correct format for postgresql
try:
cpyData = BytesIO()
TablePrefix=self.Options['PGDB:TreeTablePrefix']
NewTableName=TablePrefix+str(TableID)
HostIndex=self.DBConnection.MapTableIDToServerIndex(TableID)
cpyData.write(struct.pack('!11sii', b'PGCOPY\n\377\r\n\0', 0, 0))
cpyData.write(TreeData.tostring())
cpyData.write(struct.pack('!h', -1)) # file trailer
logging.info("Start Copying Data....")
cpyData.seek(0)
self.DBConnection.ActiveCursors[HostIndex].copy_expert('COPY '+NewTableName+' FROM STDIN WITH BINARY', cpyData)
logging.info("Adding "+str(len(TreeData))+" Galaxies to Table"+str(TableID))
except Exception as Exp:
logging.info(">>>>>Error While Processing Tree")
logging.info(type(Exp))
logging.info(Exp.args)
logging.info(Exp)
raw_input("PLease press enter to continue.....")
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