bind_insert_async.py

# -----------------------------------------------------------------------------
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#
# 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.
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# 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.
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#
#    https://www.apache.org/licenses/LICENSE-2.0
#
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# 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(),
        params=sample_env.get_connect_params(),
    )

    # -------------------------------------------------------------------------
    # "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",), ("Twelfth",)]

    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())