112 lines
3.7 KiB
Python
112 lines
3.7 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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# bind_insert_async.py
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#
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# An asynchronous version of bind_insert.py
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#
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# Demonstrates how to insert rows into a table using bind variables.
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# -----------------------------------------------------------------------------
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import asyncio
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import oracledb
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import sample_env
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async def main():
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connection = await oracledb.connect_async(
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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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)
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# -------------------------------------------------------------------------
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# "Bind by position"
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# -------------------------------------------------------------------------
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rows = [
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(1, "First"),
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(2, "Second"),
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(3, "Third"),
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(4, "Fourth"),
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(5, None), # Insert a NULL value
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(6, "Sixth"),
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(7, "Seventh"),
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]
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with connection.cursor() as cursor:
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# predefine the maximum string size to avoid data scans and memory
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# reallocations. The value 'None' indicates that the default
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# processing can take place
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cursor.setinputsizes(None, 20)
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await cursor.executemany(
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"insert into mytab(id, data) values (:1, :2)", rows
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)
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# -------------------------------------------------------------------------
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# "Bind by name"
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# -------------------------------------------------------------------------
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rows = [
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{"d": "Eighth", "i": 8},
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{"d": "Ninth", "i": 9},
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{"d": "Tenth", "i": 10},
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{"i": 11}, # Insert a NULL value
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]
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with connection.cursor() as cursor:
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# Predefine maximum string size to avoid data scans and memory
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# reallocations
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cursor.setinputsizes(d=20)
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await cursor.executemany(
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"insert into mytab(id, data) values (:i, :d)", rows
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)
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# -------------------------------------------------------------------------
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# Inserting a single bind still needs tuples
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# -------------------------------------------------------------------------
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rows = [("Eleventh",), ("Twelth",)]
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await connection.executemany(
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"insert into mytab(id, data) values (12, :1)", rows
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)
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# Don't commit - this lets the demo be run multiple times
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# await connection.commit()
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# -------------------------------------------------------------------------
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# Now query the results back
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# -------------------------------------------------------------------------
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for row in await connection.fetchall("select * from mytab order by id"):
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print(row)
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asyncio.run(main())
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