75 lines
2.8 KiB
Python
75 lines
2.8 KiB
Python
#------------------------------------------------------------------------------
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# Copyright (c) 2016, 2022, 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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# generic_row_factory.py
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#
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# Demonstrates the ability to return named tuples for all queries using a
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# subclassed cursor and row factory.
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#------------------------------------------------------------------------------
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import collections
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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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class Connection(oracledb.Connection):
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def cursor(self):
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return Cursor(self)
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class Cursor(oracledb.Cursor):
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def execute(self, statement, args=None):
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prepare_needed = (self.statement != statement)
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result = super().execute(statement, args or [])
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if prepare_needed:
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description = self.description
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if description is not None:
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names = [d[0] for d in description]
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self.rowfactory = collections.namedtuple("GenericQuery", names)
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return result
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# create a new subclassed connection and cursor
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connection = Connection(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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with connection.cursor() as cursor:
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# the names are now available directly for each query executed
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for row in cursor.execute("select ParentId, Description from ParentTable"):
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print(row.PARENTID, "->", row.DESCRIPTION)
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print()
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for row in cursor.execute("select ChildId, Description from ChildTable"):
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print(row.CHILDID, "->", row.DESCRIPTION)
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print()
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