93 lines
3.1 KiB
Python
93 lines
3.1 KiB
Python
#------------------------------------------------------------------------------
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# Copyright 2016, 2017, Oracle and/or its affiliates. All rights reserved.
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#
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# Portions Copyright 2007-2015, Anthony Tuininga. All rights reserved.
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#
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# Portions Copyright 2001-2007, Computronix (Canada) Ltd., Edmonton, Alberta,
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# Canada. All rights reserved.
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#------------------------------------------------------------------------------
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#------------------------------------------------------------------------------
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# TypeHandlers.py
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# This script demonstrates the use of input and output type handlers as well
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# as variable input and output converters. These methods can be used to extend
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# cx_Oracle in many ways. This script demonstrates the binding and querying of
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# SQL objects as Python objects.
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#------------------------------------------------------------------------------
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from __future__ import print_function
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import cx_Oracle
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import datetime
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con = cx_Oracle.connect("cx_Oracle/dev@localhost/orcl")
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objType = con.gettype("UDT_BUILDING")
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class Building(object):
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def __init__(self, buildingId, description, numFloors, dateBuilt):
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self.buildingId = buildingId
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self.description = description
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self.numFloors = numFloors
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self.dateBuilt = dateBuilt
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def __repr__(self):
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return "<Building %s: %s>" % (self.buildingId, self.description)
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def BuildingInConverter(value):
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obj = objType.newobject()
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obj.BUILDINGID = value.buildingId
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obj.DESCRIPTION = value.description
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obj.NUMFLOORS = value.numFloors
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obj.DATEBUILT = value.dateBuilt
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return obj
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def BuildingOutConverter(obj):
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return Building(int(obj.BUILDINGID), obj.DESCRIPTION, int(obj.NUMFLOORS),
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obj.DATEBUILT)
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def InputTypeHandler(cursor, value, numElements):
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if isinstance(value, Building):
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return cursor.var(cx_Oracle.OBJECT, arraysize = numElements,
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inconverter = BuildingInConverter, typename = objType.name)
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def OutputTypeHandler(cursor, name, defaultType, size, precision, scale):
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if defaultType == cx_Oracle.OBJECT:
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return cursor.var(cx_Oracle.OBJECT, arraysize = cursor.arraysize,
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outconverter = BuildingOutConverter, typename = objType.name)
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buildings = [
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Building(1, "The First Building", 5, datetime.date(2007, 5, 18)),
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Building(2, "The Second Building", 87, datetime.date(2010, 2, 7)),
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Building(3, "The Third Building", 12, datetime.date(2005, 6, 19)),
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]
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cur = con.cursor()
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cur.inputtypehandler = InputTypeHandler
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for building in buildings:
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try:
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cur.execute("insert into TestBuildings values (:1, :2)",
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(building.buildingId, building))
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except cx_Oracle.DatabaseError as e:
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error, = e.args
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print("CONTEXT:", error.context)
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print("MESSAGE:", error.message)
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raise
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print("NO OUTPUT TYPE HANDLER:")
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for row in cur.execute("select * from TestBuildings order by BuildingId"):
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print(row)
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print()
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cur = con.cursor()
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cur.outputtypehandler = OutputTypeHandler
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print("WITH OUTPUT TYPE HANDLER:")
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for row in cur.execute("select * from TestBuildings order by BuildingId"):
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print(row)
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print()
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