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