python-oracledb/samples/bind_insert_async.py

112 lines
3.7 KiB
Python

# -----------------------------------------------------------------------------
# Copyright (c) 2023, 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.
# -----------------------------------------------------------------------------
# -----------------------------------------------------------------------------
# bind_insert_async.py
#
# An asynchronous version of bind_insert.py
#
# Demonstrates how to insert rows into a table using bind variables.
# -----------------------------------------------------------------------------
import asyncio
import oracledb
import sample_env
async def main():
connection = await oracledb.connect_async(
user=sample_env.get_main_user(),
password=sample_env.get_main_password(),
dsn=sample_env.get_connect_string(),
)
# -------------------------------------------------------------------------
# "Bind by position"
# -------------------------------------------------------------------------
rows = [
(1, "First"),
(2, "Second"),
(3, "Third"),
(4, "Fourth"),
(5, None), # Insert a NULL value
(6, "Sixth"),
(7, "Seventh"),
]
with connection.cursor() as cursor:
# predefine the maximum string size to avoid data scans and memory
# reallocations. The value 'None' indicates that the default
# processing can take place
cursor.setinputsizes(None, 20)
await cursor.executemany(
"insert into mytab(id, data) values (:1, :2)", rows
)
# -------------------------------------------------------------------------
# "Bind by name"
# -------------------------------------------------------------------------
rows = [
{"d": "Eighth", "i": 8},
{"d": "Ninth", "i": 9},
{"d": "Tenth", "i": 10},
{"i": 11}, # Insert a NULL value
]
with connection.cursor() as cursor:
# Predefine maximum string size to avoid data scans and memory
# reallocations
cursor.setinputsizes(d=20)
await cursor.executemany(
"insert into mytab(id, data) values (:i, :d)", rows
)
# -------------------------------------------------------------------------
# Inserting a single bind still needs tuples
# -------------------------------------------------------------------------
rows = [("Eleventh",), ("Twelth",)]
await connection.executemany(
"insert into mytab(id, data) values (12, :1)", rows
)
# Don't commit - this lets the demo be run multiple times
# await connection.commit()
# -------------------------------------------------------------------------
# Now query the results back
# -------------------------------------------------------------------------
for row in await connection.fetchall("select * from mytab order by id"):
print(row)
asyncio.run(main())