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array_dml_rowcounts.py
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array_dml_rowcounts.py
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#------------------------------------------------------------------------------
# Copyright (c) 2016, 2022, 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.
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# array_dml_rowcounts.py
#
# Demonstrates the use of the 12.1 feature that allows cursor.executemany()
# to return the number of rows affected by each individual execution as a list.
# The parameter "arraydmlrowcounts" must be set to True in the call to
# cursor.executemany() after which cursor.getarraydmlrowcounts() can be called.
#------------------------------------------------------------------------------
import oracledb
import sample_env
# 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())
connection = oracledb.connect(sample_env.get_main_connect_string())
cursor = connection.cursor()
# show the number of rows for each parent ID as a means of verifying the
# output from the delete statement
for parent_id, count in cursor.execute("""
select ParentId, count(*)
from ChildTable
group by ParentId
order by ParentId"""):
print("Parent ID:", parent_id, "has", int(count), "rows.")
print()
# delete the following parent IDs only
parent_ids_to_delete = [20, 30, 50]
print("Deleting Parent IDs:", parent_ids_to_delete)
print()
# enable array DML row counts for each iteration executed in executemany()
cursor.executemany("""
delete from ChildTable
where ParentId = :1""",
[(i,) for i in parent_ids_to_delete],
arraydmlrowcounts = True)
# display the number of rows deleted for each parent ID
row_counts = cursor.getarraydmlrowcounts()
for parent_id, count in zip(parent_ids_to_delete, row_counts):
print("Parent ID:", parent_id, "deleted", count, "rows.")