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Returns True if data corresponding to the receiver exists in the database

src/p/e/PEATDB-2.3/PEATSA/WebApp/WebScript.py   PEATDB(Download)
			print '[WEBAPP] Retrieving job data'
			self.job = Data.Job(jobID=self.parser.jobID(), connection=self.connection)
			if not self.job.exists():
				raise Exceptions.DatabaseRetrievalError, 'Data for job %d is not present in database' % self.job.identification