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Add Oracle object pretty-printing example.
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#------------------------------------------------------------------------------ | ||
# Copyright (c) 2023, Oracle and/or its affiliates. | ||
# | ||
# This software is dual-licensed to you under the Universal Permissive License | ||
# (UPL) 1.0 as shown at https://oss.oracle.com/licenses/upl and Apache License | ||
# 2.0 as shown at http://www.apache.org/licenses/LICENSE-2.0. You may choose | ||
# either license. | ||
# | ||
# If you elect to accept the software under the Apache License, Version 2.0, | ||
# the following applies: | ||
# | ||
# Licensed under the Apache License, Version 2.0 (the "License"); | ||
# you may not use this file except in compliance with the License. | ||
# You may obtain a copy of the License at | ||
# | ||
# https://www.apache.org/licenses/LICENSE-2.0 | ||
# | ||
# Unless required by applicable law or agreed to in writing, software | ||
# distributed under the License is distributed on an "AS IS" BASIS, | ||
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
# See the License for the specific language governing permissions and | ||
# limitations under the License. | ||
#------------------------------------------------------------------------------ | ||
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#------------------------------------------------------------------------------ | ||
# object_dump.py | ||
# | ||
# Shows how to pretty-print an Oracle object or collection. | ||
# Also shows how to insert a Python object to an Oracle object column. | ||
#------------------------------------------------------------------------------ | ||
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import oracledb | ||
import sample_env | ||
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# determine whether to use python-oracledb thin mode or thick mode | ||
if not sample_env.get_is_thin(): | ||
oracledb.init_oracle_client(lib_dir=sample_env.get_oracle_client()) | ||
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# Create Oracle connection and cursor objects | ||
connection = oracledb.connect(user=sample_env.get_main_user(), | ||
password=sample_env.get_main_password(), | ||
dsn=sample_env.get_connect_string()) | ||
cursor = connection.cursor() | ||
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# Create a Python class equivalent to an Oracle SDO object | ||
class MySDO(object): | ||
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def __init__(self, gtype, elem_info, ordinates): | ||
self.gtype = gtype | ||
self.elem_info = elem_info | ||
self.ordinates = ordinates | ||
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# Get Oracle type information | ||
obj_type = connection.gettype("MDSYS.SDO_GEOMETRY") | ||
element_info_type_obj = connection.gettype("MDSYS.SDO_ELEM_INFO_ARRAY") | ||
ordinate_type_obj = connection.gettype("MDSYS.SDO_ORDINATE_ARRAY") | ||
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# Convert a Python object to MDSYS.SDO_GEOMETRY | ||
def sdo_input_type_handler(cursor, value, num_elements): | ||
def sdo_in_converter(value): | ||
obj = obj_type.newobject() | ||
obj.SDO_GTYPE = value.gtype | ||
obj.SDO_ELEM_INFO = element_info_type_obj.newobject() | ||
obj.SDO_ELEM_INFO.extend(value.elem_info) | ||
obj.SDO_ORDINATES = ordinate_type_obj.newobject() | ||
obj.SDO_ORDINATES.extend(value.ordinates) | ||
return obj | ||
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if isinstance(value, MySDO): | ||
return cursor.var(obj_type, arraysize=num_elements, | ||
inconverter=sdo_in_converter) | ||
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# Create and insert a Python object | ||
sdo = MySDO(2003, [1, 1003, 3], [1, 1, 5, 7]) | ||
cursor.inputtypehandler = sdo_input_type_handler | ||
cursor.execute("truncate table TestGeometry") | ||
cursor.execute("insert into TestGeometry values (1, :1)", [sdo]) | ||
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# Define a function to pretty-print the contents of an Oracle object | ||
def dump_object(obj, prefix=""): | ||
if obj.type.iscollection: | ||
print(f"{prefix}[") | ||
for value in obj.aslist(): | ||
if isinstance(value, oracledb.DbObject): | ||
dump_object(value, prefix + " ") | ||
else: | ||
print(f"{prefix} {repr(value)}") | ||
print(f"{prefix}]") | ||
else: | ||
print(f"{prefix}{{") | ||
for attr in obj.type.attributes: | ||
value = getattr(obj, attr.name) | ||
if isinstance(value, oracledb.DbObject): | ||
print(f"{prefix} {attr.name}:") | ||
dump_object(value, prefix + " ") | ||
else: | ||
print(f"{prefix} {attr.name}: {repr(value)}") | ||
print(f"{prefix}}}") | ||
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# Query the row back | ||
cursor.execute("select geometry from TestGeometry") | ||
for (obj,) in cursor: | ||
dump_object(obj) |
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