93 lines
3.2 KiB
Python
93 lines
3.2 KiB
Python
#------------------------------------------------------------------------------
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# Copyright (c) 2016, 2020, 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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# This script requires cx_Oracle 5.0 and higher.
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#------------------------------------------------------------------------------
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import cx_Oracle
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import datetime
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import sample_env
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con = cx_Oracle.connect(sample_env.get_main_connect_string())
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obj_type = con.gettype("UDT_BUILDING")
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class Building(object):
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def __init__(self, building_id, description, num_floors, dateBuilt):
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self.building_id = building_id
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self.description = description
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self.num_floors = num_floors
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self.dateBuilt = dateBuilt
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def __repr__(self):
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return "<Building %s: %s>" % (self.building_id, self.description)
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def building_in_converter(value):
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obj = obj_type.newobject()
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obj.BUILDINGID = value.building_id
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obj.DESCRIPTION = value.description
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obj.NUMFLOORS = value.num_floors
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obj.DATEBUILT = value.dateBuilt
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return obj
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def building_out_converter(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 input_type_handler(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 = building_in_converter, typename = obj_type.name)
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def output_type_handler(cursor, name, default_type, size, precision, scale):
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if default_type == cx_Oracle.OBJECT:
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return cursor.var(cx_Oracle.OBJECT, arraysize=cursor.arraysize,
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outconverter=building_out_converter,
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typename=obj_type.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 = input_type_handler
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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.building_id, 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 = output_type_handler
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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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