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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.
#------------------------------------------------------------------------------
#------------------------------------------------------------------------------
# batch_errors.py
#
# Demonstrates the use of the Oracle Database 12.1 feature that allows
# cursor.executemany() to complete successfully, even if errors take
# place during the execution of one or more of the individual
# executions. The parameter "batcherrors" must be set to True in the
# call to cursor.executemany() after which cursor.getbatcherrors() can
# be called, which will return a list of error objects.
#------------------------------------------------------------------------------
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(user=sample_env.get_main_user(),
password=sample_env.get_main_password(),
dsn=sample_env.get_connect_string())
with connection.cursor() as cursor:
# retrieve the number of rows in the table
cursor.execute("""
select count(*)
from ChildTable""")
count, = cursor.fetchone()
print("Number of rows in child table:", int(count))
# define data to insert
data_to_insert = [
(1016, 10, 'Child B of Parent 10'),
(1017, 10, 'Child C of Parent 10'),
(1018, 20, 'Child D of Parent 20'),
(1018, 20, 'Child D of Parent 20'), # duplicate key
(1019, 30, 'Child C of Parent 30'),
(1020, 30, 'Child D of Parent 40'),
(1021, 60, 'Child A of Parent 60'), # parent does not exist
(1022, 40, 'Child F of Parent 40'),
]
print("Number of rows to insert:", len(data_to_insert))
# old method: executemany() with data errors results in stoppage after the
# first error takes place; the row count is updated to show how many rows
# actually succeeded
try:
cursor.executemany("insert into ChildTable values (:1, :2, :3)",
data_to_insert)
except oracledb.DatabaseError as e:
error, = e.args
print("Failure with error:", error.message)
print("Number of rows successfully inserted:", cursor.rowcount)
# demonstrate that the row count is accurate
cursor.execute("""
select count(*)
from ChildTable""")
count, = cursor.fetchone()
print("Number of rows in child table after failed insert:", int(count))
# roll back so we can perform the same work using the new method
connection.rollback()
# new method: executemany() with batch errors enabled (and array DML row
# counts also enabled) results in no immediate error being raised
cursor.executemany("insert into ChildTable values (:1, :2, :3)",
data_to_insert, batcherrors=True,
arraydmlrowcounts=True)
# display the errors that have taken place
errors = cursor.getbatcherrors()
print("Number of rows with bad values:", len(errors))
for error in errors:
print("Error", error.message.rstrip(), "at row offset", error.offset)
# arraydmlrowcounts also shows rows with invalid data: they have a row
# count of 0; otherwise 1 is shown
row_counts = cursor.getarraydmlrowcounts()
print("Array DML row counts:", row_counts)
# demonstrate that all of the rows without errors have been successfully
# inserted
cursor.execute("""
select count(*)
from ChildTable""")
count, = cursor.fetchone()
print("Number of rows in child table after insert with batcherrors "
"enabled:", int(count))
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