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